A system and method are disclosed to at least reduce a risk to optical network transmission performance presented by transient events, by developing and implementing provisioning instructions for routing resources in the optical network in a manner configured to reduce such risk. The system and method may selectively bias an optical channel provisioning process to preferentially select optical network configurations leading to improved transient resilience of the optical network. As a result, the optical network for example may route at least one optical channel through a specific connection path based at least in part upon the provisioning instructions. These provisioning instructions may be determined, for example, based at least in part upon a service request for transmitting resources in the at least one optical channel between two nodes and information relating to a configuration and capabilities of the at least one optical channel.
H04B 10/038 - Arrangements for fault recovery using bypasses
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
2.
Compensation of signal distoration induced by a periodic optical copropagating optical signal
The disclosure relates to a method, an optical receiver and an optical system for compensating, at an optical receiver, signal distortions induced in an optical carrier signal by a periodic copropagating optical signal, wherein the optical carrier signal and the copropagating signal copropagate at least in part of an optical system or network, by: receiving, at the optical receiver, the optical carrier signal, wherein the optical carrier signal is distorted by the copropagating signal; determining, at the optical receiver, a period of a periodic component of the distorted optical carrier signal; determining, at the optical receiver, a periodic distortion of the distorted optical carrier signal; and generating a compensation signal to correct the distorted optical carrier signal according to the determined periodic distortion.
H04B 10/071 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
H04B 10/69 - Electrical arrangements in the receiver
H04B 10/2543 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
H04B 10/2507 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
H04B 10/2531 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using spectral inversion
The disclosed apparatus, system and method of the present invention provides improved solutions related to the interconnection of communication cable connectors and communication port receptacles, and more generally, for improved handling and management of communication cable connectors and communication ports. Certain example embodiments suitable for an optical communication application, for example, provide for improved laser safety at the location of an optical communication connector and/or an optical communication port. Moreover, certain example embodiments of the present invention additionally or alternatively otherwise provide for improved communication port, module, device, and/or system handling, administration and/or other management.
A method and system for managing execution of a local craft terminal application on a local computer system comprising accessing one of the plurality of remote network elements and obtaining therefrom a launcher application program configured to manage execution of the local craft terminal application on the local computer system, launching the launcher application program on the local computer system and determining, using the launcher application program, whether the local computer system contains an appropriate copy of the local craft terminal application, and if the local computer system does not contain the appropriate copy of the local craft terminal application, obtaining the appropriate copy of the local craft terminal application from the first one of the plurality of remote network elements.
G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
An optical network includes an arrangement of optical nodes. An optical node of the arrangement, and corresponding method, perform optical connectivity discovery and negotiation-less optical fiber continuity verification in the optical network. An overall topology of optical connectivity provisioned for the arrangement is discovered by the optical node based on messages received from a management network communicatively coupling the optical nodes to each other. The optical node synchronizes, temporally and sequentially, with the other optical nodes based on the messages received, assigns fiber of the overall topology, based on a verification sequencing method, to verification slots of a verification sequence, and verifies continuity of fiber according to the verification slots of the verification sequence. The discovery, synchronization, and assignment operations enable the optical node and peer node to perform the optical fiber continuity verification in a symmetric, decentralized, and negotiation-less manner.
H04B 10/2537 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
7.
System and method for topology discovery and fiber continuity verification in network
An optical network includes an arrangement of optical nodes. An optical node of the arrangement, and corresponding method, perform optical connectivity discovery and negotiation-less optical fiber continuity verification in the optical network. An overall topology of optical connectivity provisioned for the arrangement is discovered by the optical node based on messages received from a management network communicatively coupling the optical nodes to each other. The optical node synchronizes, temporally and sequentially, with the other optical nodes based on the messages received, assigns fiber of the overall topology, based on a verification sequencing method, to verification slots of a verification sequence, and verifies continuity of fiber according to the verification slots of the verification sequence. The discovery, synchronization, and assignment operations enable the optical node and peer node to perform the optical fiber continuity verification in a symmetric, decentralized, and negotiation-less manner.
Disclosed herein is a method of transmitting a data stream from a first location to a second location through an optical network, as well as a corresponding performance monitoring unit, a transmitting arrangement and a receiving arrangement. The method comprises the steps of transmitting said data stream from said first location to said second location along a working path, wherein said data stream is transmitted in the form of a super channel comprising a number of n wavelengths within a predefined reserved wavelength range, monitoring the performance of the transmission based on the super channel signal received at said second location, and in case the performance is observed to drop below a predetermined performance threshold, unburdening the super channel from a part of said data stream while maintaining the reserved wavelength range for said super channel, by redirecting said part of the data stream for transmittal along at least one restoration path connecting said first and second locations, and transmitting the remainder of said data stream within the super channel on a number of wavelengths that is less than n, and/or with a reduced transmission rate for at least some of the wavelengths in said super channel.
A system for determining a channel margin of a data transmission channel (DTC) using error correction under real-world channel conditions is described. The system includes a monitoring unit, an operating state determining unit and a data processing unit. The monitoring unit monitors data transmission along the DTC and estimates a statistical distribution of errors (H) in the transmission of data. The operating state determining unit determines a current value of an operating state parameter for the DTC. The data processing unit determines a reference channel margin associated with said current value of the operating state parameter for a reference channel and the error correction scheme employed, provides a statistical distribution of errors (HR) associated with said reference channel for said current value of said operating state parameter, compute a deviation of H and HR, and computes a reduction of the reference channel margin.
H04L 1/20 - Arrangements for detecting or preventing errors in the information received using signal-quality detector
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
11.
Method and system for assigning spectral resources
A method for assigning spectral resources comprises assigning spectral resources for a plurality of communication channels. The spectral resources for the plurality of communication channels comprise excess resources that are at least tentatively kept unoccupied. The excess resources of a plurality of communication channels are assigned to be spectrally contiguous.
H04B 10/038 - Arrangements for fault recovery using bypasses
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
12.
Detection of gainers and exaggerated losses in unidirectional OTDR traces
A method of distinguishing whether a detected change in reflected power in an optical time domain reflectometer (OTDR) measurement carried out in a fiber optic transmission system (16) using an OTDR is caused by a an event causing actual attenuation or a change in a mode field diameter, comprising the steps of emitting a succession of first sampling light pulses of a first wavelength into the fiber optic transmission system (16) while a pumping signal with a second wavelength is emitted into the fiber optic transmission system (16), and measuring a first OTDR trace (34′) resulting from the reflection of the first sampling light pulses in the fiber optic transmission system (16), such that the first sampling light pulses and their reflections interact with the pumping signal via stimulated Raman scattering. The method further comprises a step (36) of determining, based at least on information extracted from the first OTDR trace (34′), whether the detected change is mainly due to an event causing actual attenuation or to a change in the mode field diameter in the fiber optic transmission system (16).
Disclosed is a service provisioning tool and method for determining favorable implementations of a service in a grid-less optical network, wherein said service provisioning tool is configured to assign total cost values to a given implementations, select the implementation or a group of implementations having the lowest cost, wherein said total cost values are based on —cost values regarding selectable data rates on individual links, —cost values regarding necessity to install additional equipment, —cost values regarding selectable signal frequency bands. One or more of said cost values are dynamically changing as a function of one or more of the degree of utilization, the lifetime of the service, the time available for establishing the service, a modulation format and a signal power. The cost value per band width varies, depending on one or more of the size of the selected frequency band, and to what extent the selected frequency band fills gaps between occupied spectral ranges or creates gaps remaining between occupied spectral ranges.
A wavelength selective switching device comprises a plurality of input paths for receiving optical signals, a plurality of output paths for emitting the optical signals, and a switching unit for selectively directing the optical signals from the input paths to the output paths. The switching unit comprises a reflective area adapted to be concurrently illuminated by a first optical signal from a first input path among the plurality of input paths, and by a second optical signal from a second input path among the plurality of input paths, the second input path being different from the first input path, and to concurrently direct the first optical signal to a first output path among the plurality of output paths and the second optical signal to a second output path among the plurality of output paths, the second output path being different from the first output path. Said first output path and said second output path are spatially separated by said first input path and said second input path, or vice-versa.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04J 14/02 - Wavelength-division multiplex systems
G02B 6/293 - Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
G02B 6/35 - Optical coupling means having switching means
H04Q 11/00 - Selecting arrangements for multiplex systems
15.
Method and system for assigning resources in optical transport networks
The proposed invention is in the area of managing resources in optical transport networks, for example in the area of in-operation media channel format and spectrum management. For this purpose, the type of Media Channel Format is determined for each of a plurality of candidate paths, wherein each candidate path connects a pair of nodes in an optical transport network. Then, the expected weight describing traffic volume of each of the candidate paths is determined, and a spectrum share is assigned to each link of each of the candidate paths based on the determined Media Channel Formats and determined weights. In this way, spectrum shares assigned to different links and candidate paths can be used for efficiently assigning a band spectrum to each of the Media Channel Formats of the candidate paths.
H04J 14/02 - Wavelength-division multiplex systems
H04Q 11/00 - Selecting arrangements for multiplex systems
H04J 3/16 - Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
16.
AUTOMATIC MEASUREMENT OF THE NOISE PERFORMANCE OF A TRANSPONDER
Disclosed herein is a transponder (14), comprising a transmitter (18) for generating and transmitting an optical signal and a receiver (20), wherein said receiver (20) comprises a receiver input amplifier (40) at the receiver's input. The transponder further comprises a bypass line (46) configured to selectively feed an optical signal from said transmitter (18) to the receiver (20), and a control unit (22) configured for determining the performance of the transponder (14) in relation to an OSNR related parameter, by controlling the transponder to generate a noise signal to be received by the receiver (20), by operating the receiver input amplifier (40) to thereby cause ASE in the receiver input amplifier (40) and to determine a noise intensity value, generate a test signal at the transmitter (18) and to determine a signal intensity value and superimpose said noise signal and said test signal, or replicas thereof, to form a combined signal to be received by said receiver (20) and determining said performance related parameter based on said combined signal, wherein for generating said combined signal, said test signal is fed from the transmitter (18) to the receiver by means of said bypass line (46).
A first optical path and a second optical path have a common path branching point. An OTDR sampling optical signal is emitted into the first optical path and into the second optical path through the common path branching point. At least one predefined optical property of the OTDR sampling optical signal emitted into the second optical path is altered and/or of a reflection of the OTDR sampling optical signal received from the second optical path is altered. An OTDR reflected optical signal resulting from a reflection of the OTDR sampling optical signal on the first optical path and/or from a reflection on the second optical path is detected. The OTDR reflected optical signal is analyzed to determine, based on the at least one predefined optical property, whether the OTDR reflected optical signal resulted from a reflection on the first optical path and/or on the second optical path.
H04B 10/071 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
G01M 11/00 - Testing of optical apparatusTesting structures by optical methods not otherwise provided for
H04J 14/02 - Wavelength-division multiplex systems
18.
Method, computer program and routing engine for proactive performance-based frequency management
Disclosed herein is a method of assigning a wavelength to a given light path in a wavelength switched optical network, as well as a corresponding routing engine and computer program. The method comprises the following step. For each of a plurality of possible wavelengths for said light path, retrieving information from an optical performance database (30) allowing to assess whether the given wavelength meets a predetermined feasibility criterion with regard to said given light path; if the given wavelength is found to meet the predetermined feasibility criterion, determining a set of extended feasible light paths, each of which fully including the given light path, but containing one or more additional nodes; and calculating a first score based on said determined set of extended feasible light paths, wherein said method further comprises a step of choosing, based on said first score, a wavelength that has a first score indicating a low suitability for providing useful extended feasible light paths for future use.
Disclosed herein is a method for transmitting digital data in a super channel, in which a set of carriers are packed in a predetermined bandwidth. The set of carriers comprises higher and lower edge carriers having the highest and lowest wavelengths, respectively, among said set of earners, wherein data is transmitted via the higher and lower edge carriers using a corresponding modulation format, each modulation format using a constellation diagram comprising a number of symbols, wherein a binary address is associated with each symbol. Said method comprises the steps of: separating digital data to be transmitted via each of said higher and lower edge carriers into corresponding first and second data streams, and for each of said higher and lower edge carriers, mapping the data of the first data stream to predetermined first bit positions within the binary symbol addresses and the data of the second data stream to predetermined second bit positions within the binary symbol addresses, wherein said first bit positions are bit positions which have an error probability less than the average error probability of all bit positions.
H04J 14/02 - Wavelength-division multiplex systems
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H04L 27/34 - Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
H04L 5/00 - Arrangements affording multiple use of the transmission path
H03M 13/25 - Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
b) for detecting fluorescent or reflected light backscattered at said at least one part (22) of the filter mat (20) caused by the illumination thereof with sampling light, wherein the system (10) is configured for inferring the level of dirtiness of the filter mat (20) from the amount of detected fluorescent or reflected light.
A method for determining the position of an irregularity in an optical transmission fiber using an optical time domain reflectometer, the method comprising the steps of emitting a succession of sampling light pulses into the optical transmission fiber, detecting reflected light pulses resulting from the reflection of the sampling light pulses at the irregularity in the optical transmission fiber and generating corresponding time-dependent detection signals, wherein different delays are associated with detection signals corresponding to different sampling light pulses, obtaining a combined signal from the detection signals, and analyzing the combined signal for determining the position of the irregularity in the optical transmission fiber with respect to the optical time domain reflectometer, wherein the combined signal corresponds to a superposition of the detection signals.
i; of
s by less than 0.1*π, preferably less than 0.05*π and most preferably less than 0.02*π; and a change of the amount of said delay upon passing through said retardation device by less than 0.3*λ, preferably less than 0.2*λ and most preferably less than 0.1*λ, such that a phase shift of π±30%, preferably π±20% and most preferably π±10% on the output light is obtained.
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G02B 6/27 - Optical coupling means with polarisation selective and adjusting means
G02B 6/28 - Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
b) through which the data optical signal may respectively enter and exit the Raman pumping device (10), a Raman pump source (14) for generating a Raman pump signal, and at least one combiner (16) for combining the Raman pump signal with the data optical signal. The Raman pumping device (10) allows for selectively combining the Raman pump signal generated by the same Raman pump source (14), or at least parts of the same Raman pump source (14) codirectionally or counterdirectionally with the data optical signal.
H04B 10/291 - Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
H01S 3/30 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
24.
A METHOD AND SYSTEM FOR DETERMINING A MODEL REPRESENTATION FOR AN OPTICAL TRANSMITTER
A method for determining a model representation for an optical transmitter comprises determining a quantity of a subsequence of output signals of an optical transmitter, the output signals being emitted in response to a sequence of input signals provided to the optical transmitter, and determining a model representation for the optical transmitter based on the determined quantity, wherein the quantity only represents a part of the information encoded in the subsequence of the output signals.
A network node (3, 4) comprising at least one client interface port (40) and a database (46, 48) storing data allowing to retrieve for a given client interface, a service associated therewith, for a given service, a client interface associated therewith. A Maintenance End Point (MEP) (50, 52) is established on the network node and is associated with an end-to-end service between a client device (10, 12) connected with said client interface port and a remote client device connected to a remote network node (3, 4). Said MEP is configured to exchange connectivity messages with a corresponding MEP (50, 52) established on said remote network node and to detect a client interface fault and a service fault based on connectivity messages received from said corresponding MEP, or based on missing connectivity messages from said corresponding MEP. Said network node is configured to determine which service(s) is (are) related to said client interface and to inform the MEP related to this service about said client interface fault, and is configured to determine which client interface(s) is (are) associated with said service and to carry out a predetermined action associated with said client interface(s).
H04L 41/0654 - Management of faults, events, alarms or notifications using network fault recovery
H04L 43/0811 - Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
H04L 43/10 - Active monitoring, e.g. heartbeat, ping or trace-route
Disclosed herein is a method of transmitting data in an optical network (10, 100) from a first location to a second location, as well as a corresponding receiver unit and transceiver. The method comprises the following steps: modulating a same data signal on first and second carriers having first and second wavelengths, respectively, to generate first and second optical signals carrying the same information, transmitting said first and second optical signals from said first location to said second location through said optical network, coherent receiving of a selected one of said first and second optical signals by means of a coherent receiver (29) located at said second location, wherein said coherent receiving comprises the following steps: receiving a selected one or both of said first and second optical signals on a photodetector (30a, 30b), providing, by means of a local oscillator arrangement (34, 38) optically connected with said photodetector (30a, 30b), a selected one of a first local oscillator signal having a wavelength corresponding to said first wavelength and a second local oscillator signal having a wavelength corresponding to said second wavelength, in case both of said first and second optical signals are received on said photodetector, or both of said first and second local oscillator signals in case a selected one of said first and second optical signals is received on said photodetector; and processing the output signal of said photodetector by means of an electronic receiver circuit (32) connected to said photodetector (30a, 30b).
The present invention relates to an optical network element (30, 34) comprising a wavelength selective switch, WSS, (432, 136) with one or more input ports, a working output port (38) and a separate protecting output port (40), the WSS (432) being configurable to a working configuration, in which one or more channels are routed from said one or more input ports to the working output port (38), and being configurable to a protecting configuration, in which said one or more channels or a subset thereof are routed from said one or more input ports to the protecting output port (40), or with a working input port (42) and a protecting input port (44) and with one or more output ports, the WSS (136) being configurable to a working configuration, in which one or more channels are routed from the working input (42) port to the one or more output ports, and being configurable to a protecting configuration, in which one or more channels are routed from the protecting input port (44) to the one or more output ports, a computer readable medium including program code defining configuration information, a control unit configured to control the WSS (432, 136) to adopt the working configuration or the protecting configuration based on the predefined configuration information.
The proposed invention is in the area of managing resources in optical transport networks, for example in the area of in-operation media channel format and spectrum management. For this purpose, the type of Media Channel Format is determined for each of a plurality of candidate paths, wherein each candidate path connects a pair of nodes in an optical transport network. Then, the expected weight describing traffic volume of each of the candidate paths is determined, and a spectrum share is assigned to each link of each of the candidate paths based on the determined Media Channel Formats and determined weights. In this way, spectrum shares assigned to different links and candidate paths can be used for efficiently assigning a band spectrum to each of the Media Channel Formats of the candidate paths.
The present invention relates to signal processing in an optical receiver, in particular to equalization performed in coherent optical receivers. A multiple-input multiple-output (MIMO) equalizer receives and equalizes a plurality of real value signals, for example four sampled electrical baseband tributaries (HI, HQ, VI, VQ). The outputs of the multiple-input multiple-output (MIMO) equalizer provide equalized real or imaginary components of complex signals. The complex signals including the real and imaginary components are then each and individually equalized to remove chromatic dispersion.
H04B 10/69 - Electrical arrangements in the receiver
H04B 10/2569 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
30.
DETECTION OF GAINERS AND EXAGGERATED LOSSES IN UNIDIRECTIONAL OTDR TRACES
A method of distinguishing whether a detected change in reflected power in an optical time domain reflectometer (OTDR) measurement carried out in a fiber optic transmission system (16) using an OTDR is caused by a an event causing actual attenuation or a change in a mode field diameter, comprising the steps of emitting a succession of first sampling light pulses of a first wavelength into the fiber optic transmission system (16) while a pumping signal with a second wavelength is emitted into the fiber optic transmission system (16), and measuring a first OTDR trace (34') resulting from the reflection of the first sampling light pulses in the fiber optic transmission system (16), such that the first sampling light pulses and their reflections interact with the pumping signal via stimulated Raman scattering. The method further comprises a step (36) of determining, based at least on information extracted from the first OTDR trace (34'), whether the detected change is mainly due to an event causing actual attenuation or to a change in the mode field diameter in the fiber optic transmission system (16).
A Raman pumping arrangement for amplifying a data optical signal (40) has a Raman pump (12) for generating a Raman pump signal (44;45), an optical supervisory channel receiver (14) for receiving an optical supervisory channel signal (42) an amplification fiber (15) arranged such that the data optical signal (40), the optical supervisory channel signal (42), and the Raman pump signal (44;45) are transmitted therethrough; and a control unit (13) configured for controlling the operation of the Raman pump (12); wherein the control unit (13) is configured for setting the Raman pump (12) in an operation mode or a start-up mode; wherein in the operation mode, the Raman pump (12) provides an operation pumping power (120), and wherein in the start-up mode, the Raman pump (12) provides a start-up pumping power (122).
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04B 10/291 - Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
H04B 10/077 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/30 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
32.
Method and system for assigning performance indicators to objects of a network
A method of assigning performance indicators to objects of a network employing a computation to assign performance indicators to said objects of said network such that a sum of said performance indicators of objects along a given path in said network in relation to a first threshold value indicates whether said path fulfils a predetermined criterion, and/or indicates whether said path does not fulfil said predetermined criterion.
A method of evaluating a performance of a path in a network based on the performance indicators involves the steps of calculating a sum of performance indicators for said objects along said path and evaluating a performance of said path by comparing said sum against a first threshold value.
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H04Q 11/00 - Selecting arrangements for multiplex systems
H04L 12/24 - Arrangements for maintenance or administration
H04J 14/02 - Wavelength-division multiplex systems
An optical network is suggested, comprising a first set of optical fibers, a multimode multiplexer, a multimode amplifier, a multimode demultiplexer, and a second set of optical fibers, wherein the first set of optical fibers is connected via the multimode multiplexer to the multimode amplifier and wherein the multimode amplifier is connected via the multimode demultiplexer to the second set of optical fibers. Accordingly, an optical network element is provided.
An encoder encodes digital data, said encoder includes one or more component encoders, one or more interconnections between component encoders, one or more inputs and one or more outputs. The encoder is configured to carry out the following steps: combining internal input bits received via an interconnection and external input bits received via a corresponding input, to assemble a local information word, encoding the local information word such as to generate a local code word, outputting a reduced local code word and handling the same reduced local code word over to the interconnect for forwarding the same reduced local code word to another component encoder or to itself, wherein the encoder is configured to forward on each interconnect the bits of the reduced local code in parallel but with delays that are mutually different for at least a subset of the reduced local code word bits.
H03M 13/29 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
H03M 13/11 - Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
H03M 13/27 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes using interleaving techniques
In a method and system for decoding a differential M-ary phase or quadrature amplitude modulated signal, the incoming signal is decoded according to a plurality of different decoding rules, wherein said plurality of decoding rules correspond to different values of a resulting frequency difference or mismatch between a signal frequency and a local oscillator reference frequency. The invention allows to increase a tolerance window for the maximal allowable frequency offset, and thus helps to speed up an initial locking process or to allow for equipment which has a lower tuning granularity.
Disclosed is a method of Controlling a gain of an optical amplifier comprising a gain medium and at least one pumping device. The method comprises the following steps: determining or predicting a change of input signal power to the amplifier, changing the pump power from an initial pump power level to a new pump power level at a first time instant, the initial pump power level being the pump power level applied to the amplifier prior to the change in input signal power, setting the pump power to a second pump power level at a second time instant, wherein the pump power level is varied in an oscillatory manner for at least one period of time starting at a third time instant and ending at a fourth time instant, wherein said third time instant is identical with or later than said first time instant and said fourth time instant is identical with or earlier than said second time instant.
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H04B 10/296 - Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
The present invention relates to adding and dropping signals in a node of an optical network, wherein the node includes a reconfigurable optical add/drop multiplexer (ROADM). The reconfigurable optical add/drop multiplexer (ROADM) comprises output ports and at least one add port connectable to at least one line interface of the network and adapted to receive a modulated optical signal from the line interface. Selection units are connected to one of said add ports and adapted to forward the respective signals to a selected output terminal. A plurality of broadcast units is adapted to broadcast signals forwarded by the selection. Then a multiplexing and selecting device or apparatus selects and multiplexes the optical signals broadcast via broadcast unit output terminals into a plurality of wavelength-division multiplexing (WDM) optical signals and forwards the same to output ports of the reconfigurable optical add-drop multiplexer (ROADM).
The present invention relates to performing chromatic dispersion estimation in a receiver of an optical communication system. Here, the signal received by the receiver includes frames, each comprising a training portion and a data portion. The training portion comprises a plurality of identical pattern sequences. Different settings are applied to an equalizer to generate a plurality of equalized signals from at least one of the received frames. Then, at least one correlation value is calculated between a first pattern sequence and a second pattern sequence of the equalized signals and a final correlation value is derived from the respective correlation values. The setting of the equalizer corresponding to the equalized signal providing the highest final correlation value is selected to provide the chromatic dispersion estimation.
Disclosed herein is a modulator (50) for polarization-division multiplexing (PDM) transmission. The modulator (50) comprises first and second DP-MZMs (12, 28) associated with first and second polarizations, each DP-MZM (12, 28) having an input for an in-phase and a quadrature driving signal for modulating the in-phase and quadrature components of an optical signal according to respective transfer functions, and a detector (58) suitable for detecting light comprising at least a portion of the light outputted by the first DP-MZM (12) and a portion of the light outputted by the second DP-MZM (28). The modulator (50) is adapted to superimpose a first pilot signal on one of the in-phase and quadrature driving signals of the first DP-MZM (12) and on one of the in-phase and quadrature driving signals of the second DP-MZM (28), and a second pilot signal on the respective other of the in-phase and quadrature driving signals of the first and second DP-MZMs (12, 28). Further, the first and second pilot signals are chosen such that the signal detected by said detector (58) is indicative as to whether the slopes of the transfer functions are different for the in-phase and quadrature components of one of the first and second DP-MZMs (12, 28) and identical for the other of the first and second DP-MZMs (12, 28).
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
G02F 1/225 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference in an optical waveguide structure
G02F 1/21 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference
40.
ADAPTIVE CONSTELLATION DIAGRAM REDUCING THE IMPACT OF PHASE DISTORTIONS
Disclosed herein is a method of encoding and/or decoding data for optical data transmission along a transmission link, as well as corresponding transmitters and receivers. The data is encoded based on an adaptive constellation diagram in a 2-D plane, said constellation diagram including a first and a second pair of symbols, wherein the symbols of the first pair of symbols are located at opposite sides of the origin of the 2-D plane at a first distance di from each other, and wherein the symbols of the second pair of symbols are located at opposite sides of the origin of the 2-D plane at a second distance d2 from each other. The method comprises a step of adapting the constellation diagram by varying the ratio of the first and second distances d1, d2 such as to minimize or nearly minimize a bit error rate in the transmitted data.
A connector panel for plug-in units in a telecommunication system, the telecommunication system including a sub-rack or shelf having a backplane for power supply of a number of N plug-in units within the shelf and for enabling the N plug-in units within the shelf to communicate with each other; wherein the connector panel is an entity separate from the backplane and includes a number of m connectors providing an interface between n dedicated plug-in units among the N plug-in units within the shelf, with 2≤n
H04J 14/02 - Wavelength-division multiplex systems
G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
H04B 10/80 - Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups , e.g. optical power feeding or optical transmission through water
G02B 6/38 - Mechanical coupling means having fibre to fibre mating means
42.
SERVICE-BASED LOSS FORWARDING IN COMMUNICATION NETWORKS
A network node (3, 4) comprising at least one client interface port (40) and a database (46, 48) storing data allowing to retrieve for a given client interface, a service associated therewith, for a given service, a client interface associated therewith. A Maintenance End Point (MEP) (50, 52) is established on the network node and is associated with an end-to-end service between a client device (10, 12) connected with said client interface port and a remote client device connected to a remote network node (3, 4). Said MEP is configured to exchange connectivity messages with a corresponding MEP (50, 52) established on said remote network node and to detect a client interface fault and a service fault based on connectivity messages received from said corresponding MEP, or based on missing connectivity messages from said corresponding MEP. Said network node is configured to determine which service(s) is (are) related to said client interface and to inform the MEP related to this service about said client interface fault, and is configured to determine which client interface(s) is (are) associated with said service and to carry out a predetermined action associated with said client interface(s).
Disclosed is a method for decoding an optical data signal. Said optical data signal is phase and amplitude modulated according to a constellation diagram with at least eight constellation points representing non-binary symbols. Said decoding method comprises the following steps: —carrying out a carrier phase recovery of a received signal ignoring the possible occurrence of phase slips, —decoding said signal after phase recovery, wherein in said decoding, possible cycle slips occurring during phase recovery are modelled as virtual input to an equivalent encoder assumed by the decoding scheme. Further disclosed are a related encoding method as well as a receiver and a transmitter.
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
H03M 13/27 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes using interleaving techniques
H03M 13/29 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
H03M 13/39 - Sequence estimation, i.e using statistical methods for the reconstruction of the original codes
H03M 13/45 - Soft decoding, i.e. using symbol reliability information
A cable clamp for clamping a cable with respect to a through hole of a solid object is presented. The cable clamp includes first and second elements (102, 103) and retainer devices (105) for keeping the first and second elements with respect to each other so that the cable gets clamped between the first and second elements and the cable clamp gets locked to the edges of the through hole with the aid of first claws extending over the edges of the through hole on a first side of the solid object and with the aid of second claws capable of extending over the edges of the through hole on the second side of the solid object. The cable clamp can be inserted into the through hole when the first and second elements are tilted with respect to each other so that the first claws are nearer to each other.
At least one data-stream is re-routed and a network element is provided for re-routing at least one data-stream. A first part and a second part of a data-stream received at a first node and are transmitted to a second node via two different network paths, respectively. The first is transmitted from the first node to the second node via a first network path. A second network path is determined, and the difference between latencies of the first and second network paths is also determined. If the latency of the first network path is larger than the latency of the second network path, the at least one data-stream at the first node is re-routed from the first network path to the second network path provided that the time gap between data packets received by the first node exceeds said difference between latencies.
H04B 10/588 - Compensation for non-linear transmitter output in external modulation systems
G02F 1/225 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference in an optical waveguide structure
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
G02F 1/21 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference
47.
Clock recovery method and clock recovery arrangement for coherent polarization multiplex receivers
Component signal values are derived from component signals and fed to at least one fixed equalizer which generates equalizer output signals. The signals are fed to phase error detectors generating phase error signals. The phase error signals are combined with further phase error signals derived by further error detectors receiving signal values from further equalizers and/or the component signal values directly from sample units.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
H04L 7/00 - Arrangements for synchronising receiver with transmitter
An optical IQ modulator (IQM) including two parallel Mach-Zehnder modulators (MZM1, MZM2) generates single sideband data signals. A control unit (18) generates additional optical single sideband pilot signals (PS1, PS2) positioned in a lower and a higher sideband respectively, and also further pilot signals (PS3, PS4) in both sidebands. A IQ modulator output signal (MOS) converted into electrical monitoring signals (MOS) and monitored. A control unit (18) selects control signals (CS12, CS3, CS4) and controls the IQ modulator via its bias ports (6, 7, 8) till the power transfer functions (PTF) of the Mach-Zehnder modulators (MZM1, MZM2) and the phase difference (ΔΦ) between their output signals is optimized.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
G02F 1/225 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference in an optical waveguide structure
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H04L 5/00 - Arrangements affording multiple use of the transmission path
G02F 1/21 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference
49.
Centralized data path establishment augmented with distributed control messaging
A communication network has a plurality of network elements (NEs) and links between the NEs. A method includes computing, at a central controller, a data path from the source NE to the destination NE along a number of intermediate NEs, sending, from the central controller, central control messages to all or at least a plurality of NEs among the source NE, the intermediate NEs and the destination NE, the central control messages including explicit path information, the explicit path information in at last some of the central control messages comprising more information than needed by the recipient NE for its set-up for data transport along the path, and sending distributed control messages between NEs of the path, the distributed control messages being based on at least one central control message received by one of the NEs.
A method and device is provided for reducing optical transmission impairments, particularly nonlinear effects, of at least one link Said method comprising the following steps: extracting a phase information (Δθ) from an optical signal (120) received via that at least one link, determining a nonlinear coefficient (γ), associated with the at least one link, based on the phase information (Δθ), applying a control mechanism (202) using the nonlinear coefficient (γ). Furthermore, a communication system is suggested comprising said device.
H04B 10/58 - Compensation for non-linear transmitter output
H04B 10/2543 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
A method and a device is provided driving an optical laser diode (710, 711) during operation in an optical communication network, by determining a laser transfer function (741, 742) during operation of the laser diode (710, 711) and providing a control signal (750, 749) for driving the laser diode (710, 711) according to the laser transfer function (741, 742). Further, a method for driving a first and a second optical laser diode during operation in an optical communication network is provided. Furthermore, an optical amplifier and a communication system is suggested.
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/30 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
H01S 5/068 - Stabilisation of laser output parameters
H01S 5/0683 - Stabilisation of laser output parameters by monitoring the optical output parameters
H01S 5/40 - Arrangement of two or more semiconductor lasers, not provided for in groups
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H01S 5/06 - Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
52.
Method and arrangement for signal transmission and compensation of back reflections in optical access PON systems
In a network terminal (ONU) of an optical network near end crosstalk (NEC) is compensated by a digital generated cancellation signal. To establish a connection with another terminal (OLT) signals avoiding NEC are transmitted and the compensation is performed while the power of the transmitted signal is increased in steps.
H04B 3/32 - Reducing cross-talk, e.g. by compensating
H04B 3/23 - Reducing echo effects or singingOpening or closing transmitting pathConditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
H04B 10/2507 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
H04J 14/02 - Wavelength-division multiplex systems
H04Q 11/00 - Selecting arrangements for multiplex systems
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
It is provided an apparatus, comprising a box configured to conduct an optical fiber from an exterior to an interior of the box; at least one of a mounting means adapted to mount a connecting means to which the optical fiber may be connected and a guiding means adapted to guide the optical fiber, wherein the at least one of the mounting means and the guiding means is arranged in the interior of the box; a detecting means arranged in the interior of the box adapted to detect a first signal from the interior of the box, wherein the first signal is at least one of a light and a smoke; wherein the interior of the box is substantially shielded from a second signal from an exterior of the box, and the detecting means is suitable to detect the second signal in a same manner as the first signal.
G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
G01M 11/00 - Testing of optical apparatusTesting structures by optical methods not otherwise provided for
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
G02B 6/255 - Splicing of light guides, e.g. by fusion or bonding
54.
Photonic cross-connect with reconfigurable add-drop-functionality
A photonic cross-connect arrangement is presented which is able to cope with the transmission of super-channels, wherein complete super-channels are dropped and added to change a direction of transport. At least a cyclic filter is used in a drop-branch of a cross-connect for dividing a super-channel into sub-channels and/or at least a further cyclic filter is used in an add-branch to configure a super-channel.
A method and a device for conveying optical data are provided, wherein an optical network unit conveys data to a terminal via dual sideband modulation, wherein the terminal processes only the upper or only the lower sideband received from the optical network unit, and wherein several dual sideband modulated signals from several optical network units partially overlap when being received at the terminal. Furthermore, a communication system is suggested comprising at least one such device.
Component signal values are derived from component signals and fed to at least one fixed equalizer which generates equalizer output signals. The signals are fed to phase error detectors generating phase error signals. The phase error signals are combined with further phase error signals derived by further error detectors receiving signal values from further equalizers and/or the component signal values directly from sample units.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
H04L 7/00 - Arrangements for synchronising receiver with transmitter
A cable clamp for clamping a cable with respect to a through hole of a solid object is presented. The cable clamp comprises first and second elements (102, 103) and retainer devices (105) for keeping the first and second elements with respect to each other so that the cable gets clamped between the first and second elements and the cable clamp gets locked to the edges of the through hole with the aid of first claws extending over the edges of the through hole on a first side of the solid object and with the aid of second claws capable of extending over the edges of the through hole on the second side of the solid object. The cable clamp can be inserted into the through hole when the first and second elements are tilted with respect to each other so that the first claws are nearer to each other.
A network element of a software-defined network comprises a data transfer interface (210) for receiving and transmitting data and a processing system (215) for constructing a software-defined data path and a fixed-functionality data path such as for example an IP/MPLS or L2 switching path. The software-defined data path comprises look-up tables for selecting software-defined actions and the fixed-functionality data path defines fixed-functionality actions. The processing system is adapted to convert metadata associated with data managed by the software-defined data path to a data format suitable for the fixed-functionality data path when one or more of the fixed-functionality actions are needed in conjunction with forwarding the data. One of the fixed-functionality actions is selected at least partly on the basis of which one of the look-up tables was most recently accessed, and the determined fixed-functionality action is carried out so as to initiate the one or more needed fixed-functionality actions.
The invention refers a method and an arrangement for channel set up in an optical network. An optical signal path is configured for a certain optical channel signal (OC1) of a WDM-signal. This channel signal (OC1) is on-off-modulated by a modulation test signal (MT1) having a predetermined lower frequency and is generating a channel test signal (OT1). This channel test signal (OT1) is combined with other optical channels (OC2-OCn) to the WDM-signal (WS) and transmitted via said path. At a start node (1) or a downstream node (3, 5) a measurement signal (EMI, EM3) is derived from the complete WDM-signal (WS) without wavelength de-multiplexing. The measurement signal (EMI, EM3) is compared with a correlation signal (MC1) and an obtained power level (PC1) is used to adjust the channel power (PC1, PC2, PC3) to achieve predetermined target power values (PC1-PC4) at different power monitoring points (19, 40, 41, 58). The adjustment step is repeated for all downstream nodes (3, 5) and all further channel signals (OC2-OCn).
H04J 14/02 - Wavelength-division multiplex systems
H04B 10/077 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
A method for operating an optical network element is provided, wherein based on a quality parameter a subsequent set of parameters is selected to operate the optical network element. Also, an according optical network element and a communication system comprising at least one such optical network element are suggested.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04B 10/2507 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
09 - Scientific and electric apparatus and instruments
Goods & Services
Computer software and hardware for use in computer network
management; computer software and hardware for implementing
and managing communication service provider computer
hardware, computer software, and communications equipment
across global networks, data centers and private networks;
telecommunications and data networking software and
hardware, namely, software, communications equipment, and
applications for networks, including cloud networking,
control and management, Software Defined Networking (SDN),
and Network Functions Virtualization (NFV).
09 - Scientific and electric apparatus and instruments
Goods & Services
Telecommunications and data networking hardware, namely,
packet-optical transport systems comprised of mounting racks
for telecommunications hardware containing automatic
telecommunications switching apparatus having multi-terabit
switching capacity, processing modules and interface
modules; all for use in aggregating, switching and
transporting concurrent OTN (Optical Transport Network),
SONET/SDH (Synchronous Optical Network/Synchronous Digital
Hierarchy), DWDM (Dense Wavelength Division Multiplexing),
packet data and transparent services across multiple network
infrastructures and communications protocols.
An optical network is suggested, comprising a first set of optical fibers, a multimode multiplexer, a multimode amplifier, a multimode demultiplexer, and a second set of optical fibers, wherein the first set of optical fibers is connected via the multimode multiplexer to the multimode amplifier and wherein the multimode amplifier is connected via the multimode demultiplexer to the second set of optical fibers. Accordingly, an optical network element is provided.
A first optical data signal is transmitted on a first data carrier from a first network element. First service information is transmitted from a first service by means of a first optical service signal on a first service carrier. A second optical data signal is transmitted on a second data carrier from a second network element, and second service information is transmitted by a second optical service signal on a second service carrier. An offset between a frequency of the first data carrier and a frequency of the first service carrier is substantially equal to an offset between a frequency of the second data carrier and a frequency of the second service carrier.
A method and a device for data processing in an optical communication network are provided, wherein in an energy saving mode of a polarization multiplexing system data signals are transmitted or received via one polarization plane; and wherein components of the transmitter or receiver of the other polarization plane are at least partially operated in a reduced power mode. Furthermore, a communication system is suggested comprising said device.
Disclosed herein is a method of establishing a path for data transport from a source network element (NE) to a destination NE in a communication network comprising a plurality of NEs and links between said NEs. The method comprises the steps of computing, at a central controller, a data path from said source NE to said destination NE along a number of intermediate NEs, sending, from said central controller, central control messages to all or at least a plurality of NEs among said source NE, said intermediate NEs and said destination NE, said central control messages including explicit path information, said explicit path information in at least some of the central control messages comprising more information than needed by the recipient NE for its set-up for data transport along said path, and sending distributed control messages between NEs of said path, said distributed control messages being based on at least one central control message received by one of said NEs. Said distributed control messages allow for distributing switch set-up information that was lost due to failure in the transfer of a central control message.
A method for data processing of an optical network unit is provided, the method comprising the steps of receiving a configuration information at the optical network unit, adjusting a light signal to a wavelength or wavelength range indicated by the configuration information, demodulating an incoming optical signal by means of the light signal, mixing the demodulated incoming optical signal with a signal generated by an oscillator and generating a modulated optical upstream signal modulating the light signal by means of a software radio, so that the resulting optical upstream frequency can be shifted with respect to the frequency of the local oscillator by a programmable amount. Furthermore, an according device and a communication system are suggested comprising at least one such device.
An optical network has an optical line termination coupled to a backbone network, in particular to an optical long haul network and a local exchange coupled to an optical access network. The local exchange provides an optical connection between an optical network unit of a tree topology and the optical line termination, which is part of a ring topology. There is also described a method for processing data in such an optical network.
A received POLMUX signal is rotated by fixed rotation parameters (Rot0, Rot1, Rot2) and the rotated POLMUX signal with optimal signal performance is selected and phase information is derived from both polarities. A pre-filter improves the timing accuracy.
H04L 7/027 - Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
A method for processing data in an optical network element is provided, wherein a multicarrier signal is linear pre-coded, and wherein the linear pre-coded signal is modulated. An according optical network element is also suggested.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
A method and device is provided for reducing optical transmission impairments, particularly nonlinear effects, of at least one link. Said method comprising the following steps: extracting a phase information (Δθ) from an optical signal (120) received via that at least one link, determining a nonlinear coefficient (γ), associated with the at least one link, based on the phase information(Δθ), applying a control mechanism (202) using the nonlinear coefficient (γ). Furthermore, a communication system is suggested comprising said device.
H04B 10/2543 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
72.
Method and arrangement for adaptive dispersion compensation
MIN).
A plurality of compensation function (T(M)) is applied according to a predetermined dispersion (CD) range and after a second iteration is the compensation filter (11) set to an optimum compensation function (T(M)).
An optical IQ modulator (IQM) including two parallel Mach-Zehnder modulators (MZM1, MZM2) generates single sideband data signals. A control unit (18) generates additional optical single sideband pilot signals (PS1, PS2) positioned in a lower and a higher sideband respectively, and also further pilot signals (PS3, PS4) in both sidebands. A IQ modulator output signal (MOS) converted into electrical monitoring signals (MOS) and monitored. A control unit (18) selects control signals (CS12, CS3, CS4) and controls the IQ modulator via its bias ports (6, 7, 8) till the power transfer functions (PTF) of the Mach-Zehnder modulators (MZM1, MZM2) and the phase difference (ΔΦ) between their output signals is optimized.
Method and device for processing a communication network A method and a device for processing a communication network are provided, wherein (a) a first performance parameter of the communication network is determined; (b) a third performance parameter is determined based on the first performance parameter and a second performance parameter, which second performance parameter was previously determined, wherein the second performance parameter comprises a forecast of an expected network performance over time until the end of the scheduled lifetime of the communication network; and (c) the communication network is processed based on the third performance parameter. Furthermore, an according computer program product is suggested.
The present invention provides an apparatus, in particular an optical network unit, which comprises a first part operably coupled to an arm of an optical fiber network, the first part comprises an optical module including an optical-electric interface and/or an electric-optical interface locked on a preset wavelength band, and an interface module, and at least one second part operably coupled to a network entity of a communication network, each comprising a control unit, a signal processing unit and an interface module. One of the control units of the at least one second part is set by a optical line terminal of the optical fiber network as a master control unit configured to tune and control the optical module of the first part. The first part and the at least one second part are wireless coupled with respect to each other via the interface modules.
It is provided an apparatus, comprising a box configured to conduct an optical fiber from an exterior to an interior of the box; at least one of a mounting means adapted to mount a connecting means to which the optical fiber may be connected and a guiding means adapted to guide the optical fiber, wherein the at least one of the mounting means and the guiding means is arranged in the interior of the box; a detecting means arranged in the interior of the box adapted to detect a first signal from the interior of the box, wherein the first signal is at least one of a light and a smoke; wherein the interior of the box is substantially shielded from a second signal from an exterior of the box, and the detecting means is suitable to detect the second signal in a same manner as the first signal.
G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
77.
Optical line terminal transmitting device for next generation optical access networks
An Optical Line Terminal (OLT) transmitting device is provided, the device comprising an IQ modulator having a first input, a second input and an output, a first digital analog converter (DAC) directly coupled to the first input of the IQ modulator, a second digital analog converter (DAC) directly coupled to the second input of the IQ modulator; an optical filter directly coupled to the output of the IQ modulator.
A photonic cross-connect arrangement is presented which is able to cope with the transmission of super-channels, wherein complete super-channels are dropped and added to change a direction of transport. At least a cyclic filter is used in a drop-branch of a cross-connect for dividing a super-channel into sub-channels and/or at least a further cyclic filter is used in an add-branch to configure a super-channel.
An optical communication system, a method and a network device for an optical network are provided, wherein the device comprises a first port coupled with a first optical fiber link, a second port coupled with a second optical fiber link, the first port and the second port being configured to be coupled with respect to each other in case of a failure of the first optical fiber link or in case of a failure of the second optical fiber link.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
A method for phase recovery in a system that includes a clock recovery unit and an estimation unit. The clock recovery unit of the system has a first phase detector unit. The estimation unit has a second phase detector unit and it is configured to estimate a gain of the second phase detector unit. The estimation unit and the clock recovery unit are configured to operate in parallel.
H03D 3/24 - Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
G06F 1/04 - Generating or distributing clock signals or signals derived directly therefrom
H03L 7/07 - Automatic control of frequency or phaseSynchronisation using a reference signal applied to a frequency- or phase-locked loop using several loops, e.g. for redundant clock signal generation
H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
A method for operating an optical network element is provided, wherein based on a guality parameter a subseguent set of parameters is selected to operate the optical network element. Also, an according optical network element and a communication system comprising at least one such optical network element are suggested.
A method and a device for conveying optical data are provided, wherein an optical network unit conveys data to a terminal via dual sideband modulation, wherein the terminal processes only the upper or only the lower sideband received from the optical network unit, and wherein several dual sideband modulated signals from several optical network units partially overlap when being received at the terminal. Furthermore, a communication system is suggested comprising at least one such device.
An optical network is suggested, comprising a first set of optical fibers, a multimode multiplexer, a multimode amplifier, a multimode demultiplexer, and a second set of optical fibers, wherein the first set of optical fibers is connected via the multimode multiplexer to the multimode amplifier and wherein the multimode amplifier is connected via the multimode demultiplexer to the second set of optical fibers. Accordingly, an optical network element is provided.
The invention refers a method and an arrangement for channel set up in an optical network. An optical signal path is configured for a certain optical channel signal (OC1) of a WDM-signal. This channel signal (OC1) is on-off-modulated by a modulation test signal (MT1) having a predetermined lower frequency and is generating a channel test signal (OT1). This channel test signal (OT1) is combined with other optical channels (OC2-OCn) to the WDM-signal (WS) and transmitted via said path. At a start node (1) or a downstream node (3, 5) a measurement signal (EMI, EM3) is derived from the complete WDM-signal (WS) without wavelength de-multiplexing. The measurement signal (EM1, EM3) is compared with a correlation signal (MC1) and an obtained power level (PC1) is used to adjust the channel power (PC1, PC2, PC3) to achieve predetermined target power values (PC1-PC4) at different power monitoring points (19, 40, 41, 58). The adjustment step is repeated for all downstream nodes (3, 5) and all further channel signals (OC2-OCn).
A method for processing data in an optical network element are provided, wherein the optical network element comprises a local oscillator operating at a first frequency; wherein an incoming data stream is received at a second frequency; wherein the incoming data steam is processed using the first frequency; wherein a first pattern is searched in the incoming data stream; wherein a second pattern is searched in the incoming data stream; and wherein the first pattern corresponds to the first frequency being in the spectrum on one side of the second frequency and the second pattern corresponds to the first frequency being in the spectrum on the other side of the second frequency. Also, a corresponding optical network element and a communication system comprising at least one such optical network element are suggested.
A method and devices for processing data in an optical network are provided, wherein a centralized component is connected to several decentralized components; wherein first data is conveyed from the centralized component to at least two decentralized components, wherein at least two decentralized components share an optical resource; and wherein second data is conveyed from the decentralized component to the decentralized component via at least one separate optical resource. Furthermore, a communication system is suggested comprising said device.
A method and a device for data processing in an optical communication network are provided, wherein in an energy saving mode of a polarization multiplexing system data signals are transmitted or received via one polarization plane; and wherein components of the transmitter or receiver of the other polarization plane are at least partially operated in a reduced power mode. Furthermore, a communication system is suggested comprising said device.
An optical fiber ring having a plurality of passive ring nodes and an active ring node with a switch to interrupt or close the fiber ring, wherein the passive ring nodes are configured to connect an optical feeder section to each direction of the fiber ring and wherein arbitrary wavelengths signals generated in a feeder section can be distributed to all other ring nodes and feeder sections and wherein receivers in the feeder sections are configured to select an arbitrary number of wavelength signals in receiving direction.
H04B 10/2569 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
A method and a device for service provisioning in a communication network are provided, wherein a resource is utilized in the communication network, which resource is not yet available for productive use by the network. Also, an according communication system comprising at least one such device is suggested.
An optical network component is provided comprising a semiconductor optical amplifier with an input and an output, wherein the input is connected to a light source, wherein the output is connected to an amplitude modulator, wherein the semiconductor optical amplifier converts an amplitude modulated signal from the amplitude modulator to a phase modulated signal and provides the phase modulated signal at its output. Also, a transmitter comprising at least one such optical network component is suggested.
FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V. (Germany)
Inventor
Bianciotto, Alessandro
Slovak, Juraj
Van Den Borne, Dirk
Gross, Dirk-Daniel
Abstract
A method for an optical communication system and an optical communication system comprising a pump source configured to generate a pump signal having rotating polarization, a polarization sensitive receiver for receiving the optical signal having a polarization tracking cut-off frequency, wherein the polarization of the pump signal is configured to rotate at a predetermined frequency of polarization rotation and the frequency of polarization rotation of the pump signal is higher than the polarization tracking cut-off frequency of the receiver. Suitable for mitigation of cross-polarization modulation (XPolM) related effects in coherent polarization multiplexed quadrature phase shift keying (CP-QPSK) systems.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04B 10/2543 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
H04B 10/2569 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
H04B 10/291 - Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
09 - Scientific and electric apparatus and instruments
37 - Construction and mining; installation and repair services
38 - Telecommunications services
41 - Education, entertainment, sporting and cultural services
42 - Scientific, technological and industrial services, research and design
Goods & Services
(1) Computer Software for use in operating and monitoring computer networks and computer network switches used in managing and delivery of third party data, voice and video telecommunications traffic; Fibre optic cables; Fibre optic couplings, Fibre optic panels, Fibre optic receptors, Fibre optical apparatuses and instruments, namely, cables, transmitters, converters, switches, hubs, transceivers, repeaters, viewers, temperature probes, modulators and multiplexers for the transport of data, voice and video traffic; Fibre optic terminals, Fibre optical elements, Fibre optic cables, Junction sleeves for fibre optics, Optical fibre cables, Optical fibre sensors, Optical transmitters for use with fibre optic cables, Sheaths for optical fibre cable
(2) Telecommunication and data networking equipment and networking hardware, namely, telecommunications transmitting and receiving sets, data transmitters and receivers, namely, fibre optical cables, fibre optical transmitters and receivers, electrical signal and wire connectors, namely, circuit connectors, telecommunications hubs and switches, telecommunications routers; apparatus, instruments and units for generating, calculating, checking, inputting, storing, converting, processing, picking, transmitting, switching and receiving data, information, signals and messages, namely, computers and telecommunication servers; optical network systems consisting of computer hardware, lasers, fibre optic cables, optical connectors, optical splitters, Packet Optical, Ethernet and serial communication modems and fibre optic extenders; electrical signal and optical switches, add/drop multiplexers, optical amplifiers, signal amplifiers, optoelectronic transceivers, intelligent communications hubs, namely, network hubs for managing data communication within a computer or communications network, optical waveguides to conduct optical wavelengths; telecommunications network hardware, namely, routers, Ethernet switches, and software for optical signal processing, modulation, transmitting and receiving, interconnecting, managing, controlling and operating core, enterprise, metropolitan, local and wide area networks; computers, computer monitors, electronic circuits, optical and computer network switches, fibre optic cables, electric wires, signal amplifiers and optical amplifiers, electrical and electric converters, frequency converters, electric power generators, multiplexers, add drop multiplexers, transponders, transceivers and optical cross connects for telecommunication and communication by sending, converting, diverting and amplifying electronic and fibre optical signals in stationary and mobile communication networks; optical network computer operating systems; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electric and optical signals, namely, fibre optic adapters, electrical adapters, optical modulators, optical coders, fibre optic cables, lasers for fibre optic communication, optical demodulators, digital signal processors; optical communication products, namely, lasers, fibre optic cables, optical connectors, optical splitters, Ethernet and serial communication and fibre optic extenders; computer hardware; identifying, prioritising and routing switches; digital communication network switches; ATM switches; optical fibres, optical amplifiers, optical transmitters and optical receivers and multiplexers (1) Repair, maintenance and installation of computer hardware and software within the field of telecommunication and communication by computer; Installation of integrated mobile networks [comprised of computer hardware and software]; Installation of wireless telecommunications equipment, namely, routers, Ethernet, data and optical switches, data communication multiplexers, and wireless local area networks [comprised of computer hardware and software]; Installation of computer networks [comprised of computer hardware and software]; Installation of computer software for telecommunications network management systems; Telecommunication network maintenance services, namely, computer and optical network and link efficiency analysis, fault identification and repair, and equipment usage optimization; Fibre optic telecommunications services, namely, construction, installation, assembly, maintenance, repair, and operation of fibre optic telecommunication cable network and systems; Telecommunication network consultancy services, namely, troubleshooting of optical networking products, repair, maintenance and installation of computer hardware and software within the field of telecommunications and communication by computer; consulting services in the field of telecommunications, namely, design, documentation, installation, implementation assignments and network management integration for computer and optical networks; Development and Design of Software; Programming of computer software for others; Software development services, Software engineering; Software installation, Software maintenance services, Repair, maintenance, updating and upgrading of computer software, Customization of computer software; Debugging computer software for others; Computer software installation; Computer software integration; Computer software technical support services, Rental of computer Software, Software consulting services; rental of software for telecommunication networks; Leasing of computer software
(2) Repair, maintenance and installation of computers, computer monitors, electronic circuits, optical and computer network switches, fibre optic cables, electric wires, signal amplifiers and optical amplifiers, electrical and electric converters, frequency converters, electric power generators, multiplexers, add drop multiplexers, transponders, transceivers and optical cross connects for telecommunication and communication; information, advice and consultancy in respect of all of the aforesaid services. Computer training and conducting courses, classes, seminars and work-shops for using, maintaining, monitoring and controlling software and hardware in the field of telecommunications systems; information, advice and consultancy in respect of all the aforesaid services; Telecommunication network engineering and telecommunication computer systems administration, namely, computer programming for others; engineering services for operating telecommunication terminals, access provider centers to a computer network, namely, acting as an application service provider in the field of knowledge management to host computer application software for searching and retrieving information databases and computer networks; technical support in the form of monitoring, troubleshooting, architecting and planning computer networks; design and development for others in the field of telecommunications networks and their operations, namely, computer networks, wireless computer networks, global computer networks; computer software and hardware testing services; updating, installation and maintenance of computer software for interconnecting, managing, controlling and operating core, enterprise, metropolitan, local and wide area networks; research and design services for others in the field of computer and optical network modeling and simulation, design, migration, troubleshooting, maintenance and engineering, installation and turn-up services of computer software and hardware, for others; design and development of computer hardware; information, advice and consultancy in respect of all the aforesaid services
Method of ribbonizing a plurality of optical fibers (103) and ribbonizing apparatus for optical fibers, comprising a tablet (101) including fiber aligning means (104, 105) for aligning a plurality of optical fibers (103) in parallel, the ribbonizing apparatus being configured to be movably arranged in a splicing apparatus (102) when the plurality of optical fibers (103) is aligned in the tablet (101), and to be removed from the splicing apparatus (102) after a splicing process, so that the plurality of optical fibers (103) is not damaged due to mechanical stress.
An optical network element has a light source which provides an optical signal that is fed to at least two modulators. Each modulator provides an optical carrier signal that is conveyed to a receiving unit. The receiving unit is configured to determine a deviation signal between the optical carrier signal and a carrier conveyed via an incoming signal and to feed the deviation signal to the modulator for adjusting the frequency and/or the phase of the optical carrier signal. Also, a corresponding method for processing data and a communication system with at least one optical network are described.
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
09 - Scientific and electric apparatus and instruments
37 - Construction and mining; installation and repair services
38 - Telecommunications services
41 - Education, entertainment, sporting and cultural services
42 - Scientific, technological and industrial services, research and design
Goods & Services
(1) Computer Software for use in operating and monitoring computer networks and computer network switches used in managing and delivery of third party data, voice and video telecommunications traffic; Fibre optic cables; Fibre optic couplings, Fibre optic panels, Fibre optic receptors, Fibre optical apparatuses and instruments, namely, cables, transmitters, converters, switches, hubs, transceivers, repeaters, viewers, temperature probes, modulators and multiplexers for the transport of data, voice and video traffic; Fibre optic terminals, Fibre optical elements, Fibre optic cables, Junction sleeves for fibre optics, Optical fibre cables, Optical fibre sensors, Optical transmitters for use with fibre optic cables, Sheaths for optical fibre cable
(2) Telecommunication and data networking equipment and networking hardware, namely, telecommunications transmitting and receiving sets, data transmitters and receivers, namely, fibre optical cables, fibre optical transmitters and receivers, electrical signal and wire connectors, namely, circuit connectors, telecommunications hubs and switches, telecommunications routers; apparatus, instruments and units for generating, calculating, checking, inputting, storing, converting, processing, picking, transmitting, switching and receiving data, information, signals and messages, namely, computers and telecommunication servers; optical network systems consisting of computer hardware, lasers, fibre optic cables, optical connectors, optical splitters, Packet Optical, Ethernet and serial communication modems and fibre optic extenders; electrical signal and optical switches, add/drop multiplexers, optical amplifiers, signal amplifiers, optoelectronic transceivers, intelligent communications hubs, namely, network hubs for managing data communication within a computer or communications network, optical waveguides to conduct optical wavelengths; telecommunications network hardware, namely, routers, Ethernet switches, and software for optical signal processing, modulation, transmitting and receiving, interconnecting, managing, controlling and operating core, enterprise, metropolitan, local and wide area networks; computers, computer monitors, electronic circuits, optical and computer network switches, fibre optic cables, electric wires, signal amplifiers and optical amplifiers, electrical and electric converters, frequency converters, electric power generators, multiplexers, add drop multiplexers, transponders, transceivers and optical cross connects for telecommunication and communication by sending, converting, diverting and amplifying electronic and fibre optical signals in stationary and mobile communication networks; optical network computer operating systems; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electric and optical signals, namely, fibre optic adapters, electrical adapters, optical modulators, optical coders, fibre optic cables, lasers for fibre optic communication, optical demodulators, digital signal processors; optical communication products, namely, lasers, fibre optic cables, optical connectors, optical splitters, Ethernet and serial communication and fibre optic extenders; computer hardware; identifying, prioritising and routing switches; digital communication network switches; ATM switches; optical fibres, optical amplifiers, optical transmitters and optical receivers and multiplexers (1) Repair, maintenance and installation of computer hardware and software within the field of telecommunication and communication by computer; Installation of integrated mobile networks [comprised of computer hardware and software]; Installation of wireless telecommunications equipment, namely, routers, Ethernet, data and optical switches, data communication multiplexers, and wireless local area networks [comprised of computer hardware and software]; Installation of computer networks [comprised of computer hardware and software]; Installation of computer software for telecommunications network management systems; Telecommunication network maintenance services, namely, computer and optical network and link efficiency analysis, fault identification and repair, and equipment usage optimization; Fibre optic telecommunications services, namely, construction, installation, assembly, maintenance, repair, and operation of fibre optic telecommunication cable network and systems; Telecommunication network consultancy services, namely, troubleshooting of optical networking products, repair, maintenance and installation of computer hardware and software within the field of telecommunications and communication by computer; consulting services in the field of telecommunications, namely, design, documentation, installation, implementation assignments and network management integration for computer and optical networks; Development and Design of Software; Programming of computer software for others; Software development services, Software engineering; Software installation, Software maintenance services, Repair, maintenance, updating and upgrading of computer software, Customization of computer software; Debugging computer software for others; Computer software installation; Computer software integration; Computer software technical support services, Rental of computer Software, Software consulting services; rental of software for telecommunication networks; Leasing of computer software
(2) Repair, maintenance and installation of computers, computer monitors, electronic circuits, optical and computer network switches, fibre optic cables, electric wires, signal amplifiers and optical amplifiers, electrical and electric converters, frequency converters, electric power generators, multiplexers, add drop multiplexers, transponders, transceivers and optical cross connects for telecommunication and communication; information, advice and consultancy in respect of all of the aforesaid services. Computer training and conducting courses, classes, seminars and work-shops for using, maintaining, monitoring and controlling software and hardware in the field of telecommunications systems; information, advice and consultancy in respect of all the aforesaid services; Telecommunication network engineering and telecommunication computer systems administration, namely, computer programming for others; engineering services for operating telecommunication terminals, access provider centers to a computer network, namely, acting as an application service provider in the field of knowledge management to host computer application software for searching and retrieving information databases and computer networks; technical support in the form of monitoring, troubleshooting, architecting and planning computer networks; design and development for others in the field of telecommunications networks and their operations, namely, computer networks, wireless computer networks, global computer networks; computer software and hardware testing services; updating, installation and maintenance of computer software for interconnecting, managing, controlling and operating core, enterprise, metropolitan, local and wide area networks; research and design services for others in the field of computer and optical network modeling and simulation, design, migration, troubleshooting, maintenance and engineering, installation and turn-up services of computer software and hardware, for others; design and development of computer hardware; information, advice and consultancy in respect of all the aforesaid services
97.
Method and device for processing data in a communication network
A method and a device for processing data in a communication network, wherein a first node is served by a second node and communicates with a third node. The first node informs a fourth node to process data destined for the third node. The second node, the first node and the fourth node are connected via a transport network that is capable of a point-to-multipoint connection.
A method and a device for processing a signal determine a timing phase over an observation interval of an input signal. A frequency estimation is determined based on the timing phase. A phase correction is determined for the observation interval based on the timing phase and the frequency offset. Then the phase correction is used to adjust the timing of the input signal. Also, a communication system with at least one such device is described.
A received POLMUX signal is rotated by fixed rotation parameters (Rot0, Rot1, Rot2) and the rotated POLMUX signal with optimal signal performance is selected and phase information is derived from both polarities. A pre-filter improves the timing accuracy.
H04L 7/027 - Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
100.
METHOD AND ARRANGEMENT FOR SIGNAL TRANSMISSION AND COMPENSATION OF BACK REFLECTIONS IN OPTICAL ACCES PON SYSTEMS
In a network terminal (ONU) of an optical network near end crosstalk (NEC) is compensated by a digital generated cancellation signal. To establish a connection with another terminal (OLT) signals avoiding NEC are transmitted and the compensation is performed while the power of the transmitted signal is increased in steps.
H04B 10/2507 - Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
H04B 3/23 - Reducing echo effects or singingOpening or closing transmitting pathConditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
