A procedure for providing fiber optic service to users in living units inside a multidwelling unit (MDU) building having an outside wall or façade. A number of connection enclosures are fixed on the façade along a path extending in the region of a set of living units to be serviced via associated drop lines. A feeder cable containing fibers assigned to service the living units is routed through the enclosures. Inside a given enclosure, fibers of a given drop line are connected to a set of fibers in the feeder cable that are assigned to service a living unit with which the line is associated. Before the drop lines pass through the façade to enter the living units, the lines are managed over the façade by inserting them into one or more cable support members that are fastened to the façade and in which the feeder cable is also inserted for support.
In an optical fiber comprising a central axis (z) with a cladding that extend along z and a coating that is disposed about the cladding, a twist with a twist period (τ) is imparted on the optical fiber about z. The twist mitigates micro-bend-induced cross-talk. The cladding comprises a substantially circular axial cross section. The substantially circular axial cross-section comprises a cladding center and a cladding outer diameter (ODclad). Multiple cores (e.g., a first core, a second core, etc.) are disposed within the cladding. At least one core is disposed helically about z to form a helical core, with the helical core comprising a helical pitch (p) that is approximately equal to τ (meaning, p≈τ). The twist has a twist period (τ) that is less than 9.1 centimeters (meaning, τ<9.1 cm).
09 - Appareils et instruments scientifiques et électriques
35 - Publicité; Affaires commerciales
Produits et services
Communication cables, namely fiber optic cable and hybrid
cables incorporating fiber optic cable, and connectors
therefore; optical fiber, dispersion-compensating modules,
metallized pigtails, optical connectors, optical amplifiers,
optical modulators, sensors, lasers for non-medical use,
optical attentuators, optical multiplexers, optical
adaptors, optical terminators, jumpers, shelves and fiber
management frames (Term considered too vague by the
International Bureau pursuant to Rule 13 (2) (b) of the
Regulations), optical distribution and termination boxes,
splitters, fiber optic splice closures; and
telecommunications systems, comprising optical fiber and/or
optical fiber cable, optical amplifiers, optical
transmitters and optical receivers. Retail store services featuring refurbished electrical,
electronic, and telecommunications products, specifically,
refurbished electrical apparatus, electrical controllers,
and measurement instruments, electrical conductor cables,
fiber optic cables, telephone cables and telephone products,
namely, telephone recorders, telecommunications and
information technology equipment, and electronic components;
import and export agency services; commercial intermediation
services in the nature of mediation of contracts for
purchase and sale of products; commercial representation,
namely, publicity consultation; presentation of products in
media, specifically, product demonstration, for commercial
purposes; retail store services featuring electronics.
4.
STRESS-CONTROLLED PACKAGING SCHEME FOR FIBER-BASED OPTICAL DEVICES
A packaging scheme for a fiber-based optical device includes a substrate for supporting the fiber-based optical device, with a set of individual adhesive bonds used to affix the device to the substrate. Individual bonds are placed along the length of the device in a manner that reduces the possibility of fiber movement subsequent to packaging, even in the presence of changes in ambient temperature over the lifetime of the packaged optical device.
09 - Appareils et instruments scientifiques et électriques
35 - Publicité; Affaires commerciales
Produits et services
Communication cables, namely fiber optic cable and hybrid
cables incorporating fiber optic cable, and connectors
therefor; optical fiber, dispersion-compensating modules,
metallized pigtails, optical connectors, optical amplifiers,
optical modulators, sensors, lasers for non-medical use,
optical attentuators, optical multiplexers, optical
adaptors, optical terminators, jumpers, shelves and fiber
management frames, optical distribution and termination
boxes, splitters, fiber optic splice closures (term
considered too vague by the International Bureau pursuant to
Rule 13 (2) (b) of the Regulations); and telecommunications
systems, comprising optical fiber and/or optical fiber
cable, optical amplifiers, optical transmitters and optical
receivers. Retail store services featuring refurbished electrical,
electronic, and telecommunications products, specifically,
refurbished electrical apparatus, electrical controllers,
and measurement instruments, electrical conductor cables,
fiber optic cables, telephone cables and telephone products,
namely, telephone recorders, telecommunications and
information technology equipment, and electronic components;
import and export agency services; commercial intermediation
services in the nature of mediation of contracts for
purchase and sale of products; commercial representation,
namely, publicity consultation; presentation of products in
media, specifically, product demonstration, for commercial
purposes; retail store services featuring electronics.
An optical fiber that complies with ITU-T G.657.A2 recommendations. The optical fiber comprises an inner cladding that is adjacent to the core, thereby extending from a core radius (rcore) to an inner cladding radius (rinner_clad). The inner cladding refractive index decreases approximately linearly as a function of radius (r), thereby decreasing approximately linearly from a first inner cladding relative refractive index (Δinner_clad_1) to a second inner cladding relative refractive index (Δinner_clad_2). The ratio of rinner_clad to rcore is between approximately 3.2 and approximately 4.2 (˜3.2≤rinner_clad/rcore≤˜4.2).
An optical preamplifier is optically coupled to a power amplifier. The optical preamplifier comprises a preamplification stage signal input, a preamplification stage pump input and a preamplification stage signal output. The optical preamplifier is pulsed pumped (instead of being pumped by a continuous-wave (CW) pump). The power amplifier comprises a power amplifier signal input that is optically coupled to the preamplification stage signal output.
Optical fiber systems for permitting both shape sensing and imaging include an optical fiber and a fan-in device (such as a tapered fiber combiner (TFC) or a tapered fiber bundle (TFB)). The optical fiber comprises a sensing core that is inscribed with fiber Bragg gratings (FBGs). The sensing core is surrounded by an imaging waveguide. The imaging waveguide is surrounded by a fiber cladding. The TFC comprises a tapered sensing core that is optically coupled to the sensing core of the optical fiber. The tapered imaging core is optically coupled to the imaging waveguide of the optical fiber. The TFC further comprises a tapered inner cladding that surrounds both the tapered sensing core and the tapered imaging core. The tapered inner cladding is also optically coupled to the imaging waveguide. An outer cladding surrounds the tapered inner cladding and is optically coupled to the fiber cladding.
G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques
G01D 5/353 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec atténuation ou obturation complète ou partielle des rayons lumineux les rayons lumineux étant détectés par des cellules photo-électriques en modifiant les caractéristiques de transmission d'une fibre optique
9.
DISTRIBUTED SENSING USING CONTINUOUS FIBER BRAGG GRATING (FBG)
G01L 1/24 - Mesure des forces ou des contraintes, en général en mesurant les variations des propriétés optiques du matériau quand il est soumis à une contrainte, p. ex. par l'analyse des contraintes par photo-élasticité
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G02F 1/01 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p. ex. commutation, ouverture de porte ou modulationOptique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur
G02F 1/125 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p. ex. commutation, ouverture de porte ou modulationOptique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des éléments acousto-optiques, p. ex. en utilisant la diffraction variable par des ondes sonores ou des vibrations mécaniques analogues dans une structure de guide d'ondes optique
This disclosure teaches distributed sensing (DXS), such as distributed acoustic sensing (DAS), distributed vibration sensing (DVS), or other distributed sensing that employs optical time domain reflectometry (OTDR) or optical frequency domain reflectometry (OFDR). In particular, the DXS is performed in a passive optical network (PON) using an enhanced back-scattering optical fiber (ESF) that is configured for DXS. The ESF is located in an optical signal communication path between an optical line terminal (OLT) (generally at a central office (CO)) and an optical network unit (ONU) in the PON. The ESF comprises an in-band wavelength range that exhibits an in-band back-scattering that is higher than native scattering. The ESF further comprises an out-of-band wavelength range that exhibits an out-of-band back-scattering that is lower than the in-band back-scattering.
H04B 10/2537 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à des procédés de diffusion, p. ex. diffusion par effet Raman ou Brillouin
H04J 14/02 - Systèmes multiplex à division de longueur d'onde
G01H 9/00 - Mesure des vibrations mécaniques ou des ondes ultrasonores, sonores ou infrasonores en utilisant des moyens sensibles aux radiations, p. ex. des moyens optiques
G01M 11/00 - Test des appareils optiquesTest des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs
H04B 10/071 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal réfléchi, p. ex. utilisant des réflectomètres optiques temporels [OTDR]
An optical fiber is formed to include a specialized cladding layer that exhibits a change in refractive index as the fiber is tapered, related to the out-diffusion of a refractive index-decreasing dopant included in the cladding layer. The change in refractive index (propagation constant) is sufficient to maintain the local taper angle relation and prevent the institution of loss oscillations as the length of the taper extends to a desired value. In particular, the specialized cladding layer may be formed to include a sufficient concentration of an index-decreasing dopant such as F, which is known to diffuse faster that the conventional cladding layer index-increasing dopants (e.g., one or more of Ge, Cl, and P).
A multicore fiber assembly in which multiple single-mode cores are coupled to form a single path. The assembly reduces the complexity of optical fiber sensor measurement and allows to keep back reflections low and measure various parameters such as fiber twist, temperature, axial strain, and fiber shape.
G01D 5/30 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec déviation des rayons lumineux, p. ex. pour une indication optique directe les rayons lumineux étant détectés par des cellules photo-électriques
G01M 11/00 - Test des appareils optiquesTest des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique
A system comprising an enhanced back-scattering region, which is confined to a limited enhanced scattering bandwidth (e.g., approximately ten decibel (10 dB) scattering bandwidth over approximately fifteen nanometer (15 nm) wavelength range in the C-Band (Conventional Band)). A signal transmission wavelength (or telecom signal wavelength) carries an optical signal at a wavelength that is at least one nanometer (1 nm) outside of the enhanced scattering bandwidth.
G02B 6/27 - Moyens de couplage optique avec des moyens de sélection et de réglage de la polarisation
H04B 10/2537 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à des procédés de diffusion, p. ex. diffusion par effet Raman ou Brillouin
16.
REDUCTION OF THERMAL SENSITIVITY IN ACTIVE OPTICAL FIBERS
A rare earth-doped optical fiber (active fiber) is proposed that exhibits a reduction in the core region thermo-optic coefficient (dn / dT) with respect to the dn/dT of the surrounding cladding. The reduction of core region dn/dT has been found to reduce the effect of transverse mode instability (TMI) in the presence of high levels of pump power (or other conditions that may also increase the heat load present in the core region). Particularly, reducing core region dn/dT by as little as 10% with respect to cladding dn/dT has been found sufficient to extend the temperature range over which active fibers remain in single mode operation. The reduction in dn/dT may be provided by modifying the dopants introduced into the core region where, for example, the introduction of boron into Yb-doped fiber is known to reduce the dn/dT of the core region.
For a hollow-core preform (from which a hollow-core fiber is ultimately drawn), alignment of an inner resonator tube within a cladding tube is accomplished by providing a sleeve with an opening through which the hollow-core preform moves. The sleeve holds a magnet that extends a magnetic field into the opening and, consequently, into the cladding tube and further into the resonator tube. When a ferromagnetic ball is placed within the resonator tube, there arises an attractive force between the magnet and the ferromagnetic ball. The outer surface of the resonator tube maintains a precise contact line with the inner surface of the cladding tube because of the attractive force between the ferromagnetic ball and the magnet. Furthermore, because the ball rolls, the contact line is maintained even when the cladding tube and the resonator tube are moved axially (along a longitudinal axis of the hollow-core preform).
A system (e.g., an optical amplifier) comprising gain fibers (e.g., Bismuth-doped optical fiber) for amplifying optical signals. The optical signals have an operating center wavelength (λ0) that is centered between approximately 1260 nanometers (˜1260 nm) and ˜1360 nm (which is in the O-Band). The gain fibers are optically coupled to pump sources, with the number of pump sources being less than or equal to the number of gain fibers. The pump sources are (optionally) shared among the gain fibers, thereby providing more efficient use of resources.
H01S 3/091 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H01S 3/0941 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente produite par un laser à semi-conducteur, p. ex. par une diode laser
H01S 3/23 - Agencement de plusieurs lasers non prévu dans les groupes , p. ex. agencement en série de deux milieux actifs séparés
H04B 10/291 - Répéteurs dans lesquels le traitement ou l’amplification est effectuée sans conversion de la forme optique du signal
H04B 10/294 - Commande de la puissance du signal dans un système à plusieurs longueurs d’onde, p. ex. égalisation du gain
22.
SYSTEM AND METHOD FOR TESTING OPTICAL DEVICES USING AN OPTICAL TIME DOMAIN REFLECTOMETER (OTDR) DEVICE
Embodiments of the invention include an optical time domain reflectometer (OTDR) device having a transmitter for transmitting a series of optical pulses, a processor for controlling the duration and frequency of the transmitted optical pulses, an optical coupler for directing the transmitted optical pulses to a device under test coupled to the OTDR and receiving light reflected back from the device under test, a detector for converting light reflected back from the device under test to an electrical signal, a display for displaying a plot of the electrical signal, and a gating function device for removing at least one saturation event from the light reflected back from the device under test. The operation of the gating function device is controlled by a gating signal provided by the processor to the gating function device. The gating signal is based on at least one characteristic of the saturation event.
A hydrogen diffusion barrier is included as an intra-cladding layer (i.e., a “ring”) within an optical fiber structure. The hydrogen diffusion barrier ring may comprise alumina (or other glass oxides) and is positioned within the fiber cladding at an optimum location with respect to the central core region of the optical fiber. The thickness of the barrier ring may be controlled by fabrication processes to control properties such as hydrogen permeability. Other alkali and alkaline earth metal oxides may be included in the composition of the barrier ring and are useful in preventing crystal formation during the fiber fabrication process.
The present disclosure provides systems and methods for optically coupling a solid-core fiber (SCF) with a hollow-core fiber (HCF). Briefly described, one embodiment of the system comprises a graded-index (GRIN) fiber and a hollow fiber (HF) that optically couple the SCF with the HCF. The combination of the GRIN with the HF permits mode matching between the SCF and the HCF, while concurrently increasing return loss from the HCF to the SCF.
Embodiments of the invention include an optical fiber ribbon. The optical fiber ribbon includes a plurality of optical fibers arranged adjacent to one another in a linear array. The optical fiber ribbon also includes a bonding matrix material applied to at least a portion of the outer surface of at least two adjacent optical fibers. The optical fiber ribbon also includes at least one marking applied to the outer surface of at least one optical fiber. The at least one marking is applied to the outer surface of at least one optical fiber in a manner that reduces the optical transmission loss of the optical fibers.
A device for enabling fiber optic network users to confirm their network connectivity. In one embodiment, the device has a housing with a front end for connecting to a network fiber inside a terminal at the premises. A device fiber inside the housing has a proximal end at the front of housing for receiving IR signals routed through the network fiber. The IR signals propagate to a distal end of the device fiber which projects into a viewable open region at the back of the housing, and corresponding IR signals are emitted from the distal end of the fiber. A card is supported in the open region near the fiber's distal end. The card is coated with a material that emits a visible light in response to the IR signals, thus enabling users to confirm network connectivity by viewing the card when the front of the housing is connected to the network fiber. Active embodiments of the inventive device are also disclosed.
H04B 10/077 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant un signal de surveillance ou un signal supplémentaire
H04B 10/25 - Dispositions spécifiques à la transmission par fibres
29.
SYSTEMS AND METHODS FOR WAVELENGTH DIVISION MULTIPLEXING
Embodiments of the present disclosure generally relate to systems, methods, and articles of manufacture for using a fiber laser with wavelength division multiplexers (WDMs) for a variety of purposes. For example, implementations described herein may be used with high-power Raman fiber laser (RFL) systems, or the like. A laser system is provided that may include a fiber laser; a laser path comprising optical fiber; and a plurality of wavelength division multiplexers (WDMs) positioned within the laser path coupling the optical fiber; wherein at least one of the plurality of WDMs has the widest wavelength spacing and is positioned first in the laser path, thereby providing increased power stability.
H01S 3/00 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H01S 3/30 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet utilisant des effets de diffusion, p. ex. l'effet Brillouin ou Raman stimulé
H04J 14/02 - Systèmes multiplex à division de longueur d'onde
30.
OPTICAL FIBER ROLLABLE RIBBON HAVING LOW YOUNG'S MODULUS BONDING MATRIX MATERIAL
Embodiments of the invention include an optical fiber ribbon having a low Young's modulus bonding matrix material. The optical fiber ribbon includes a plurality of optical fibers arranged adjacent to one another in a linear array. The optical fiber ribbon also includes a plurality of bonding matrix material portions applied to at least a portion of the outer surface of at least two adjacent optical fibers. The bonding matrix material portions have a low Young's modulus. Also, the plurality of bonding matrix material portions are applied to at least a portion of the outer surface of at least two adjacent optical fibers in such a way that the linear array of optical fibers forms a partially bonded optical fiber ribbon.
A system of aligning concatenated sections of multicore optical fiber incorporates the capability of intentionally changing core assignments as part of the azimuthal alignment process. The intentional changing of core assignments, referred to as offset clocking, compensates for differences in properties of the individual core regions in a way that reduces variations between the spatial channels supported in the transmission system. The offset clocking technique can be used, e.g., to improve the attenuation (or other selected properties of the propagating signals). The offset clocking technique may be used to step through sequential changes core assignments at one or more splice locations (passive clocking) or identify a particular pairing of cores from one fiber section to the next (e.g., “good quality” core assigned to a “poor quality” signal exiting the first section) and rotate the fiber sections with respect to each other to achieve this particular core assignment.
Described herein are systems, methods, and articles of manufacture for high back-scattering waveguides (e.g., optical fibers) and sensors employing high back-scattering optical fibers. Briefly described, one embodiment comprises a high back-scattering fiber, or enhanced scattering fiber or “ESF,” that features resistance specifications that remain intact over lengths of fiber in excess of 1 m, or preferably >100 m, or preferably >1 km, wherein the reflectivity of the ESFs may be precisely tuned within a range from −100 dB/mm to −70 dB/mm, and wherein the enhanced scattering may be spatially continuous or, alternatively, may be at discrete locations spaced apart by 100 microns to >10 m.
In an optical fiber comprising a central axis (z) with a cladding that extend along z and a coating that is disposed about the cladding, a twist with a twist period (τ) is imparted on the optical fiber about z. The twist mitigates micro-bend-induced cross-talk. The cladding comprises a substantially circular axial cross section. The substantially circular axial cross-section comprises a cladding center and a cladding outer diameter (ODclad). Multiple cores (e.g., a first core, a second core, etc.) are disposed within the cladding. At least one core is disposed helically about z to form a helical core, with the helical core comprising a helical pitch (p) that is approximately equal to τ (meaning, p ≈ τ). The twist has a twist period (τ) that is less than 9.1 centimeters (meaning, τ < 9.1cm).
A multi-core optical fiber comprises at least two (2) helical cores. When the multi-core optical fiber is bent, such that it has a bend length (L) and a bend radius (R), each core experiences a different strain, thereby resulting in an effective optical length difference (δl) between the cores. In the present disclosure, the helical cores have a pitch (P) that reduces δl/L to a value that is less than 5·10−6 (i.e., δl/L<5·10−6).
Described herein are systems, methods, and articles of manufacture for a coated fiber modified by actinic radiation to increase back-scattering, which experiences very little back-scattering decay at a temperature and time of exposure that is sufficient to noticeably degrade the coating and/or noticeably degrade the optical fiber due to outgassing of hydrogen from the coating. In one embodiment, an optical fiber comprises a fiber length, a coating having a treated coating weight, wherein the treated coating weight is at least 25% less of an original coating weight prior to an annealing treatment, and an optical back-scatter along the fiber length greater than a Rayleigh back-scattering over the fiber length, wherein the optical back-scatter does not decrease along the fiber length by more than 3 dB after exposure to annealing treatment. A further embodiment relates to a method comprising receiving an optical fiber at an inlet of at least one heat source, the optical fiber including a coating having an original coating weight and an optical back-scatter along a fiber length and applying an annealing treatment to the optical fiber by the least one heat source at a predetermined temperature Ta during a predetermined time ta, wherein the original coating weight is reduced by at least 25% to a treated coating weight during the annealing treatment, wherein the optical back-scatter does not decrease along the fiber length by more than 3 dB after the annealing treatment.
Embodiments of the invention include an optical fiber cable. The optical fiber cable includes a multi-fiber unit tube that is substantially circular and dimensioned to receive a plurality of optical fibers. The optical fiber cable also includes a plurality of partially bonded optical fiber ribbon units positioned within the multi-fiber tube. The partially bonded optical fiber ribbon units are partially bonded in such a way that each partially bonded optical fiber ribbon is formed in a substantially circular shape or a random shape. The optical fiber cable also includes at least one elastomeric strength layer formed around the partially bonded optical fiber ribbon units. The optical fiber cable also includes an outer jacket surrounding the multi-fiber tube.
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique
G02B 6/52 - Installation souterraine ou sous l'eauInstallation à travers des tubes, des conduits ou des canalisations en utilisant un fluide, p. ex. de l'air
38.
FIBER LASER PUMPING OF BISMUTH-DOPED FIBER AMPLIFIER
A Bismuth-doped fiber-optic amplifier (BDFA) system in which a Bismuth-doped optical fiber (BDF) is pumped by a fiber-laser pump (rather than by a semiconductor pump). Because higher-power fiber-laser pumps permit over-pumping of the BDF, there are benefits to the fiber-laser-pumped BDFA that cannot be realized with inherently lower-power semiconductor pumps.
G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
H01S 3/00 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H04J 14/02 - Systèmes multiplex à division de longueur d'onde
Drop lines are supported and routed from a an ADSS trunk cable to designated users. Each of a number of non-metallic elongated support members has a main passage, and a first slit for enabling the cable to be urged into the passage from outside. Each member also has a number of aligned outer passages, and associated second slits for enabling a drop line to be urged into a given outer passage from outside. A band may be applied about each support member to prevent the cable and the drop lines from escaping the member through the slits. One end of each drop line is connected to the cable fibers inside a closure fixed at one end of a cable span. A drop line exiting an outer passage in a given support member is routed either through an outer passage in a successive member, or away from the cable to a designated user.
A strain-compensated optical cable comprises a strength member extending substantially along a length of the optical cable. The optical cable has a first buffer tube and a second buffer tube, both of which extend along the length of the optical cable. Positioned within the first buffer tube is a strain-measuring single-mode fiber (SMF). Positioned within the second buffer tube is a hollow-core fiber (HCF). The SMF is used as a means for measuring strain (s), thereby allowing for strain mitigation experienced by the HCF. A stranding material extends substantially along the length of the optical cable and strands together the first buffer tube and the second buffer tube. An outer jacket surrounds the stranding material and extends substantially along the length of the optical cable.
A storage device for an optical fiber ribbon. A spool includes a hub, a bottom flange, and a top flange. A spool opening extends axially through the hub and the flanges, and a circular array of recesses are formed along the edge of the opening in the bottom flange. A base has a number of circularly arrayed, pawls for engaging the recesses along the edge of the spool opening in the bottom flange so that when the bottom flange is engaged with the pawls on the base, the spool can rotate in only one winding direction. The hub has a hook member on its circumference which is formed to engage an optical fiber ribbon at a midpoint along its length while maintaining a specified minimum bend radius. When the ribbon is looped around the hook m ember and the spool is wound, two equal lengths of the ribbon are wound next to one another on the hub for storage. Designated fibers of the ribbon then are accessible from the stored lengths of the ribbon for splicing or other handling.
A system of aligning concatenated sections of multicore optical fiber incorporates the capability of intentionally changing core assignments as part of the azimuthal alignment process. The intentional changing of core assignments, referred to as offset clocking, compensates for differences in properties of the individual core regions in a way that reduces variations between the spatial channels supported in the transmission system. The offset clocking technique can be used, e.g., to improve the attenuation (or other selected properties of the propagating signals). The offset clocking technique may be used to step through sequential changes core assignments at one or more splice locations (passive clocking) or identify a particular pairing of cores from one fiber section to the next (e.g., “good quality” core assigned to a “poor quality” signal exiting the first section) and rotate the fiber sections with respect to each other to achieve this particular core assignment.
An optical fiber cable comprises an inner tube with strength members that are located external to, and alongside of, the inner tube. Water-blocking material is also located external to the inner tube. A sheath surrounds the strength members and the water-blocking material. The cable further comprises an optical fiber with a core, a trench surrounding the core, a cladding surrounding the trench, and a coating applied over the cladding. The cable comprises a fiber arrangement with N optical fibers (with N being an integer (e.g., 16, 32, 48, 96, etc.), of which at least one optical fiber has: a maximum effective area (Aeff) of approximately seventy-five square micrometers (˜75 μm2) at a wavelength (λ) of approximately 1550 nanometers (˜1550 nm); a maximum mode field diameter (MFD) of ˜8.8 μm at λ of ˜1550 nm; a maximum cable cut-off λ of ˜1520 nm; and, a maximum attenuation of ˜0.180 decibels-per-kilometer (dB/km) at λ of ˜1550 nm.
A multicore fiber assembly in which multiple single-mode cores are coupled to form a single path. The assembly reduces the complexity of optical fiber sensor measurement and allows to keep back reflections low and measure various parameters such as fiber twist, temperature, axial strain, and fiber shape.
A packaging scheme for a fiber-based optical device includes a substrate for supporting the fiber-based optical device, with a set of individual adhesive bonds used to affix the device to the substrate. Individual bonds are placed along the length of the device in a manner that reduces the possibility of fiber movement subsequent to packaging, even in the presence of changes in ambient temperature over the lifetime of the packaged optical device.
An optical fiber is formed to include a specialized cladding layer that exhibits a change in refractive index as the fiber is tapered, related to the out-diffusion of a refractive index-decreasing dopant included in the cladding layer. The change in refractive index (propagation constant) is sufficient to maintain the local taper angle relation and prevent the institution of loss oscillations as the length of the taper extends to a desired value. In particular, the specialized cladding layer may be formed to include a sufficient concentration of an index-decreasing dopant such as F, which is known to diffuse faster that the conventional cladding layer index-increasing dopants (e.g., one or more of Ge, Cl, and P).
A system comprising an enhanced back- scattering region, which is confined to a limited enhanced scattering bandwidth (e.g., approximately ten decibel (lOdB) scattering bandwidth over approximately fifteen nanometer (15nm) wavelength range in the C-Band (Conventional Band)). A signal transmission wavelength (or telecom signal wavelength) carries an optical signal at a wavelength that is at least one nanometer (Inm) outside of the enhanced scattering bandwidth.
H04B 7/24 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes
G02B 6/00 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage
48.
SYSTEM FOR MEASURING MICROBENDS AND ARBITRARY MICRODEFORMATIONS ALONG A THREE-DIMENSIONAL SPACE
A system for sensing microbends and micro-deformations in three-dimensional space is based upon a distributed length optical fiber formed to include a group of offset cores disposed in a spiral configuration along the length of the fiber, each core including a fiber Bragg grating that exhibits the same Bragg wavelength. A micro-scale local deformation of the multicore fiber produces a local shift in the Bragg wavelength, where the use of multiple cores allows for a complete micro-scale modeling of the local deformation. Sequential probing of each core allows for optical frequency domain reflectometry (OFDR) allows for reconstruction of a given three-dimensional shape, delineating location and size of various microbends and micro-deformations.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G01D 5/353 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens optiques, c.-à-d. utilisant de la lumière infrarouge, visible ou ultraviolette avec atténuation ou obturation complète ou partielle des rayons lumineux les rayons lumineux étant détectés par des cellules photo-électriques en modifiant les caractéristiques de transmission d'une fibre optique
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
An optical connector for terminating a cable containing one or more multicore fibers. The connector has a plug housing, a ferrule disposed inside the housing, a rotatable frame, and a multicore fiber (MCF) stub having a length of a first MCF a portion of which is fixed inside the ferrule so that a first endface of the fiber is exposed at the front end of the ferrule. An opposite endface of the first MCF is cleaved for fusion splicing to a second MCF in the cable to be terminated. The ferrule also has a flange, and the frame is formed to engage the flange for rotation so that cores in the first MCF can be aligned and positioned in a prescribed orientation relative to the plug housing, and cores in the second MCF can be aligned with corresponding cores in the first MCF when the first and the second MCFs are fusion spliced to one another.
A hydrogen diffusion barrier is included as an infra-cladding layer (i.e., a "ring") within an optical fiber structure. The hydrogen diffusion barrier ring may comprise alumina (or other glass oxides) and is positioned within the fiber cladding at an optimum location with respect to the central core region of the optical fiber. The thickness of the barrier ring may be controlled by fabrication processes to control properties such as hydrogen permeability. Other alkali and alkaline earth metal oxides may be included in the composition of the barrier ring and are useful in preventing crystal formation during the fiber fabrication process.
An amplified hollow-core fiber (HCF) optical transmission system for low latency communications. The optical transmission system comprises a low-latency amplified HCF cable. The low-latency amplified HCF cable comprises multiple HCF segments (or HCF spans). Between consecutive HCF segments, the system comprises low-latency remote optically pumped amplifiers (ROPAs). Each ROPA comprises a gain fiber, a wavelength division multiplexing (WDM) coupler, and an optical isolator. Preferably, the ROPAs are integrated into the HCF cable. Each ROPA is pumped by a remote optical pump source, which provides pump light to the gain fiber. The gain fiber receives an optical transmission signal from the HCF. The WDM coupler combines the pump light with the optical transmission signal, thereby allowing the gain fiber to amplify the optical transmission signal to an amplified transmission signal. The amplified signal is transmitted to another HCF segment through the optical isolator.
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H01S 3/00 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet
G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif
G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
H04B 10/00 - Systèmes de transmission utilisant des ondes électromagnétiques autres que les ondes hertziennes, p. ex. les infrarouges, la lumière visible ou ultraviolette, ou utilisant des radiations corpusculaires, p. ex. les communications quantiques
55.
HIGH-TEMPERATURE HYDROGEN-RESISTANT SCATTERING ENHANCEMENT IN OPTICAL FIBER
Described herein are systems, methods, and articles of manufacture for a spatially nonuniform scattering profile along its length, whose backscattering signal can be used for sensing even after fiber attenuation increases due to the conditions in the sensing environment. In one embodiment, the fiber has been pre-exposed to the conditions that produce attenuation, and the spatially nonuniform profile compensates for this. Subsequent exposure then results in very little or at least acceptable levels of additional attenuation. An exemplary fiber comprises a fiber length and an optical back scatter along the fiber length greater than a Rayleigh back scattering over the fiber length, wherein the optical back scatter does not decrease along the fiber length by more than 3 dB after exposure to a hydrogen-rich first environment having a given pressure and temperature. An exemplary method comprises drawing a fiber, applying a UV coating, post-processing the fiber using an interferogram, measuring optical back scatter enhancement dependence based on a UV dosage, incrementally increasing the reflectivity, exposing the fiber to a hydrogen-rich first environment.
C03B 37/025 - Fabrication de fibres ou de filaments de verre par étirage ou extrusion à partir de tubes, tiges, fibres ou filaments ramollis par chauffage
C03C 25/104 - Revêtement pour obtenir des fibres optiques
In curing a matrix material of a rollable optical fiber ribbon, ultraviolet light may be concentrated in a selected range of wavelengths to avoid further curing the primary coating of each fiber. A ribbon may be made by aligning the fibers, each having at least a primary coating, into a ribbon shape, applying a matrix material in intermittently distributed portions along the ribbon-shaped group of fibers, and exposing the ribbon-shaped group of fibers and applied matrix material to ultraviolet light concentrated in a range of wavelengths absorbed more by the matrix material than by the primary coating.
Embodiments of the present disclosure generally relate to systems, methods, and articles of manufacture for using a fiber laser with wavelength division multiplexers (WDMs) for a variety of purposes. For example, implementations described herein may be used with high-power Raman fiber laser (RFL) systems, or the like. A laser system is provided that may include a fiber laser; a laser path comprising optical fiber; and a plurality of wavelength division multiplexers (WDMs) positioned within the laser path coupling the optical fiber; wherein at least one of the plurality of WDMs has the widest wavelength spacing and is positioned first in the laser path, thereby providing increased power stability.
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H01S 3/0941 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente produite par un laser à semi-conducteur, p. ex. par une diode laser
An optical fiber cable having reduced surface friction may include a low-friction, fire retardant cable jacket structure. The cable jacket structure may include a thicker, highly fire-retardant cable jacket, and a thinner, low-friction skin layer formed over the cable jacket.
In accordance with a plurality of embodiments of the present invention, exemplary systems and articles of manufactures are described herein that are configured to propagate a MM signal from a light source, such as an optical fiber assembly for propagating a multimode (MM) signal from a light source, the optical fiber assembly comprising a multicore fiber (MCF) having a fiber numerical aperture (NA) value, a first core diameter and a first outer diameter (OD), and a combiner including a taper fiber bundle (TFB) portion in communication with the MCF, and at least one pigtail portion in communication with the light source, wherein the combiner propagates the MM signal from the light source, the MM signal having a signal NA value that is less than the fiber NA value such that the MM signal underfills the at least one pigtail portion.
Described herein are systems, methods, and articles of manufacture for reducing coupling loss between optical fibers, more particularly, to reducing coupling loss between a hollow-core optical fiber (HCF) and another fiber, such as solid core fibers (SCF), through the use of mismatched mode field diameter (MFD). According to one embodiment, an article is configured to reduce a coupling loss between multiple optical fibers, wherein the article includes an HCF supporting the propagation of a first mode and an SCF coupled to the HCF. According to a further embodiment, a method is described for reducing the coupling loss or splicing loss between optical fibers, such as an exemplary HCF and a solid core SMF. These exemplary methods may include coupling/splicing an exemplary HCF to an exemplary SMF with significantly smaller MFD.
An optical fiber amplifier is formed to include a grating structure inscribed within the rare earth-doped gain fiber itself, providing distributed wavelength-dependent filtering (attenuation) and minimizing the need for any type of gain-flattening filter to be used at the output of the amplifier. The grating structure may be of any suitable arrangement that provides the desired loss spectrum, for example, similar to the profile of a prior art discrete GFF. Various types of grating structures that may be used to provide distributed wavelength-dependent filtering along the gain include, but are not limited to, tilted gratings, weak Bragg gratings, long-period grating (LPG), and any suitable combination of these grating structures.
Embodiments of the invention include an optical fiber ribbon having a low Young's modulus bonding matrix material. The optical fiber ribbon includes a plurality of optical fibers arranged adjacent to one another in a linear array. The optical fiber ribbon also includes a plurality of bonding matrix material portions applied to at least a portion of the outer surface of at least two adjacent optical fibers. The bonding matrix material portions have a low Young's modulus. Also, the plurality of bonding matrix material portions are applied to at least a portion of the outer surface of at least two adjacent optical fibers in such a way that the linear array of optical fibers forms a partially bonded optical fiber ribbon.
G02B 6/04 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage formés par des faisceaux de fibres
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique
G02B 6/38 - Moyens de couplage mécaniques ayant des moyens d'assemblage fibre à fibre
A system (e.g., an optical amplifier) comprising gain fibers (e.g., Bismuth-doped optical fiber) for amplifying optical signals. The optical signals have an operating center wavelength (λ0) that is centered between approximately 1260 nanometers (˜1260 nm) and ˜1360 nm (which is in the O-Band). The gain fibers are optically coupled to pump sources, with the number of pump sources being less than or equal to the number of gain fibers. The pump sources are (optionally) shared among the gain fibers, thereby providing more efficient use of resources.
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H01S 3/0941 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente produite par un laser à semi-conducteur, p. ex. par une diode laser
H01S 3/23 - Agencement de plusieurs lasers non prévu dans les groupes , p. ex. agencement en série de deux milieux actifs séparés
H04B 10/291 - Répéteurs dans lesquels le traitement ou l’amplification est effectuée sans conversion de la forme optique du signal
H04B 10/294 - Commande de la puissance du signal dans un système à plusieurs longueurs d’onde, p. ex. égalisation du gain
H01S 3/091 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique
64.
METHODS OF INCREASING HIGHER-ORDER MODE SUPPRESSION IN LARGE-MODE AREA RING FIBERS AND SYSTEMS THEREOF
Described herein are systems, methods, and articles of manufacture for high back-scattering waveguides (e.g., optical fibers) and sensors employing high back-scattering optical fibers. Briefly described, one embodiment comprises a high back-scattering fiber, or enhanced scattering fiber or "ESF," that features resistance specifications that remain intact over lengths of fiber in excess of 1 m, or preferably >100 m, or preferably >1 km, wherein the reflectivity of the ESFs may be precisely tuned within a range from -100 dB/mm to -70 dB/mm, and wherein the enhanced scattering may be spatially continuous or, alternatively, may be at discrete locations spaced apart by 100 microns to >10 m.
G02B 6/00 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage
Disclosed herein is an all-fiber, easy to use, wavelength tunable, ultrafast laser based on soliton self-frequency-shifting in an Er-doped polarization-maintaining very large mode area (PM VLMA) fiber. The ultrafast laser system may include an all polarization-maintaining (PM) fiber mode-locked seed laser with a pre-amplifier; a Raman laser including a cascaded Raman resonator and an ytterbium (Yb) fiber laser cavity; an amplifier core-pumped by the Raman laser, the amplifier including an erbium (Er) doped polarization maintaining very large mode area (PM Er VLMA) optical fiber and a passive PM VLMA fiber following the PM Er VLMA, the passive PM VLMA for supporting a spectral shift to a longer wavelength.
H01S 3/11 - Blocage de modesCommutation-QAutres techniques d'impulsions géantes, p. ex. vidange de cavité
H01S 3/00 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet
Described herein are systems, methods, and articles of manufacture for a coated fiber modified by actinic radiation to increase back-scattering, which experiences very little back scattering decay at a temperature and time of exposure that is sufficient to noticeably degrade the coating and/or noticeably degrade the optical fiber due to outgassing of hydrogen from the coating, wherein an optical fiber comprises a fiber length, a coating having a treated coating weight, wherein the treated coating weight is at least 25% less of an original coating weight prior to an annealing treatment, and an optical back-scatter along the fiber length greater than a Rayleigh back-scattering over the fiber length, wherein the optical back-scatter does not decrease along the fiber length by more than 3 dB after exposure to annealing treatment.
C03C 25/42 - Revêtements contenant des substances inorganiques
C03C 25/62 - Traitement de surface des fibres ou filaments de verre, de substances minérales ou de scories par application d'énergie électrique ou ondulatoire par rayonnement particulaire ou par implantation d’ions
G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
A multi-core optical fiber comprises at least two (2) helical cores. When the multi- core optical fiber is bent, such that it has a bend length (L) and a bend radius (R), each core experiences a different strain, thereby resulting in an effective optical length difference (51) between the cores. In the present disclosure, the helical cores have a pitch (P) that reduces δ1/L to a value that is less than 5· 10-6(i.e., δ1/L < 5· 10-6).
Embodiments of the invention include an optical fiber cable. The optical fiber cable includes a multi-fiber unit tube that is substantially circular and dimensioned to receive a plurality of optical fibers. The optical fiber cable also includes a plurality of partially bonded optical fiber ribbon units positioned within the multi-fiber tube. The partially bonded optical fiber ribbon units are partially bonded in such a way that each partially bonded optical fiber ribbon is formed in a substantially circular shape or a random shape. The optical fiber cable also includes at least one elastomeric strength layer formed around the partially bonded optical fiber ribbon units. The optical fiber cable also includes an outer jacket surrounding the multi-fiber tube.
An alignment apparatus and method is proposed that is configured to perform alignment before bringing the fiber end faces into proximity of the arc discharge system used to perform fusion splicing. Preferably, the alignment itself is performed by using an "additive component" methodology that identifies the portions of the transverse geometry requiring substantially perfect azimuthal alignment (e.g., critical features such as core regions) and then selects the best azimuthal alignment option from the identified options based on best-fit of azimuthal asymmetries (such as markers, different cladding structures, etc.) to the set of optional alignments.
effeff) of approximately seventy-five square micrometers (~75μm2 ) at a wavelength (λ) of approximately 1550 nanometers (~1550nm); a maximum mode field diameter (MFD) of ~8.8μm at λ of ~1550nm; a maximum cable cut-off λ of ~1520nm; and, a maximum attenuation of ~0.180 decibels-per-kilometer (dB/km) at λ of ~1550nm.
A system for installing an optical fiber cable in a building hallway or living unit includes an elongated cylinder for containing an adhesive, and a continuous length of an optical fiber cable embedded in the adhesive in a configuration that avoids kinks or knots in the cable. An elongated nozzle is fixed at a first end of the cylinder for depositing the adhesive and the cable from an open tip of the nozzle, along a desired routing path in the hallway or living unit. An applicator assembly is constructed and arranged for receiving the cylinder, and for applying a dispensing force at a second end of the cylinder opposite the first end so as to urge the adhesive and the cable out of the open tip of the nozzle.
Drop lines are supported and routed from a an ADSS trunk cable to designated users. Each of a number of non-metallic elongated support members has a main passage, and a first slit for enabling the cable to be urged into the passage from outside. Each member also has a number of aligned outer passages, and associated second slits for enabling a drop line to be urged into a given outer passage from outside. A band may be applied about each support member to prevent the cable and the drop lines from escaping the member through the slits. One end of each drop line is connected to the cable fibers inside a closure fixed at one end of a cable span. A drop line exiting an outer passage in a given support member is routed either through an outer passage in a successive member, or away from the cable to a designated user.
H01B 11/06 - Câbles à paires ou quartes torsadées pourvus de moyens propres à réduire les effets de perturbations électromagnétiques ou électrostatiques, p. ex. écrans
H01B 11/08 - Écrans particuliers pour réduire la diaphonie
A photoinduced refractive index-changing material is coupled directly to both a first port and a second port. An optical interconnect structure (for optically coupling the first port to the second port) is formable in the photoinduced refractive index-changing material by selectively exposing a portion of the photoinduced refractive index-changing material. The selective exposure induces a refractive index change in the photoinduced refractive index-changing material. The change in refractive index provides the waveguiding properties of the optical interconnect structure.
Bismuth (Bi) doped optical fibers (BiDF) and Bi-doped fiber amplifiers (BiDFA) are shown and described. The BiDF comprises a gain band and an auxiliary band. The gain band has a first center wavelength (λ1) and a first six decibel (6 dB) gain bandwidth. The auxiliary band has a second center wavelength (λ2), with λ2>λ1. The system further comprises a signal source and a pump source that are optically coupled to the BiDF. The signal source provides an optical signal at λ1, while the pump source provides pump light at a pump wavelength (λ3).
An optical fiber comprising a core, a cladding disposed about the core, and a primary coating disposed about the cladding. The primary coating is cured during draw to at least eighty-five percent (85%) of the primary coating's fully cured primary-coating in situ modulus (P-ISM) value.
An optically transparent protective coating is described that remains stable at elevated temperatures associated with optical fiber-based sensor applications and is sufficiently transparent to allow for conventional fiber Bragg gratings (FBGs) to be formed by directly writing through the coating. In particular, vinyl group-containing silicone polymers have been found to provide the UV transparency required for a write-through coating (WTC) and promising mechanical properties for protecting the optical fibers, while also being able to withstand elevated temperatures for extended periods of time.
G01K 11/3206 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques en des endroits distincts de la fibre, p. ex. utilisant la diffusion de Bragg
C08G 77/20 - Polysiloxanes contenant du silicium lié à des groupes aliphatiques non saturés
A wavelength-swept optical source is based upon a combination of a coherent source of ultra-short optical pulses, doped fiber amplifier, and specialized dispersive optical medium to create time-stretched pulses. The pulses are broadened to have a spectral bandwidth that covers a wavelength range of interest for a particular wavelength sweeping application and are thereafter subjected to time-stretching within the dispersive optical medium so as to sufficiently separate in time a number of wavelength components within each pulse.
An all-fiber supercontinuum (SC) optical source utilizes a combination of a seed pulse supply of short-duration optical pulses with a highly non-linear optical medium in the form of two or more concatenated sections of highly non-linear optical fiber (HNLF) of different dispersion values and lengths. The two or more sections of HNLF are configured to include at least one section that exhibits a positive dispersion value and one section that exhibits a negative dispersion value. Non-linear effects such as self-phase modulation (SPM), cross-phase modulation (XPM), Raman amplification, and the like, cause the seed pulses to broaden as they propagate through each section of HNLF, where the differences between the dispersion values, as well as the lengths of each fiber section, are particularly configured to create an SC output that is wide and smooth, exhibiting a stable intensity and high coherence level.
An optical fiber cable may include a cable jacket, a rigid tensile reinforcement member centered within the cable jacket, and a plurality of partially bonded optical fiber ribbons around the rigid tensile reinforcement member. The optical fiber cable does not include any buffer tubes but may include a cushioning layer adjacent the ribbons.
A fiber amplifier that is particularly configured to provide gain across a large extent of the C-band spectral range (i.e., a gain bandwidth of at least 42 nm, preferably within the range of 46-48 nm) utilizes a specially-designed discrete Raman amplifier in combination with a high inversion level EDFA to extend the gain bandwidth of a conventional EDFA C-band optical amplifier, while maintaining the gain ripple below an acceptable value. The EDFA provides operation at a highly-inverted level and the specialized discrete Raman amplifier (sDRA) element has particular parameters (dispersion, length, effective area) selected to maintain operation within a “small gain” regime while also extending the long wavelength edge of the gain bandwidth and reducing the gain ripple attributed to the EDFA component.
H01S 3/30 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet utilisant des effets de diffusion, p. ex. l'effet Brillouin ou Raman stimulé
84.
SYSTEM FOR MEASURING MICROBENDS AND ARBITRARY MICRO-DEFORMATIONS ALONG A THREE-DIMENSIONAL SPACE
A system for sensing microbends and micro-deformations in three- dimensional space is based upon a distributed length optical fiber formed to include a group of offset cores disposed in a spiral configuration along the length of the fiber, each core including a fiber Bragg grating that exhibits the same Bragg wavelength. A micro-scale local deformation of the multicore fiber produces a local shift in the Bragg wavelength, where the use of multiple cores allows for a complete micro-scale modeling of the local deformation. Sequential probing of each core allows for optical frequency domain reflectometry (OFDR) allows for reconstruction of a given three-dimensional shape, delineating location and size of various microbends and micro-deformations.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
G01C 3/08 - Utilisation de détecteurs électriques de radiations
G01L 1/24 - Mesure des forces ou des contraintes, en général en mesurant les variations des propriétés optiques du matériau quand il est soumis à une contrainte, p. ex. par l'analyse des contraintes par photo-élasticité
G01N 21/00 - Recherche ou analyse des matériaux par l'utilisation de moyens optiques, c.-à-d. en utilisant des ondes submillimétriques, de la lumière infrarouge, visible ou ultraviolette
85.
Active optical cable assembly with multicore fiber
An active optical cable may include a multicore optical fiber, a connector housing, a mateable electrical connector, an array of optoelectronic converter devices in the connector housing, and an optical waveguide structure. The optical waveguide structure is configured to couple optical signals between the fiber cores and the optoelectronic converter devices in the connector housing.
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p. ex. indicateur optique de déformation
Described herein are systems, methods, and articles of manufacture for a spatially nonuniform scattering profile along its length, whose backscattering signal can be used for sensing even after fiber attenuation increases due to the conditions in the sensing environment. In one embodiment, the fiber has been pre-exposed to the conditions that produce attenuation, and the spatially nonuniform profile compensates for this. Subsequent exposure then results in very little or at least acceptable levels of additional attenuation. An exemplary fiber comprises a fiber length and an optical back scatter along the fiber length greater than a Rayleigh back scattering over the fiber length, wherein the optical back scatter does not decrease along the fiber length by more than 3 dB after exposure to a hydrogen-rich first environment having a given pressure and temperature.
Described herein are systems, methods, and articles of manufacture for reducing coupling loss between optical fibers, more particularly, to reducing coupling loss between a hollow-core optical fiber (HCF) and another fiber, such as solid core fibers (SCF), through the use of mismatched mode field diameter (MFD) and optical connector assemblies for low latency patchcords. According to one embodiment, an article is configured to include an HCF supporting the propagation of a first mode and an SCF coupled to the HCF. A method is described for reducing the coupling loss or splicing loss. These exemplary articles and methods may include coupling/splicing an exemplary HCF to an exemplary SMF with significantly smaller MFD as well as a splice-on-connector (SOC) assembly including a bridge fiber spliced between the HCF and the SCF, wherein the bridge fiber has a third MFD that is greater than the second MFD and smaller than the first MFD.
An amplified hollow-core fiber (HCF) optical transmission system for low latency communications. The optical transmission system comprises a low-latency amplified HCF cable. The low-latency amplified HCF cable comprises multiple HCF segments (or HCF spans). Between consecutive HCF segments, the system comprises low-latency remote optically pumped amplifiers (ROPAs). Each ROPA comprises a gain fiber, a wavelength division multiplexing (WDM) coupler, and an optical isolator. Preferably, the ROPAs are integrated into the HCF cable. Each ROPA is pumped by a remote optical pump source, which provides pump light to the gain fiber. The gain fiber receives an optical transmission signal from the HCF. The WDM coupler combines the pump light with the optical transmission signal, thereby allowing the gain fiber to amplify the optical transmission signal to an amplified transmission signal. The amplified signal is transmitted to another HCF segment through the optical isolator.
Before pulling a leading end of a fiber optic cable through a duct in order to splice the cable fibers to other fibers located at a far end of the duct, the outer jacket of the cable and elements surrounding the cable fibers are removed to expose the fibers. The exposed fibers are prepared by (a) removing coatings on the fibers, (b) cleaving the ends of the fibers, and (c) placing the cleaved fibers into one or more protective covers. A cable grip or sock is dimensioned and formed to envelop the leading end of the cable including the protective covers, up to and including the outer jacket. The grip together with the cable are pulled through the duct, and the grip and the protective covers are removed at the far end of the duct to expose the cleaved fibers for splicing to the other fibers at the far end.
In curing a matrix material of a Tollable optical fiber ribbon, ultraviolet light may be concentrated in a selected range of wavelengths to avoid further curing the primary coating of each fiber. A ribbon may be made by aligning the fibers, each having at least a primary coating, into a ribbon shape, applying a matrix material in intermittently distributed portions along the ribbon-shaped group of fibers, and exposing the ribbon-shaped group of fibers and applied matrix material to ultraviolet light concentrated in a range of wavelengths absorbed more by the matrix material than by the primary coating.
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique
G02B 1/10 - Revêtements optiques obtenus par application sur les éléments optiques ou par traitement de la surface de ceux-ci
G02B 1/12 - Revêtements optiques obtenus par application sur les éléments optiques ou par traitement de la surface de ceux-ci par traitement de la surface, p. ex. par irradiation
G02B 6/04 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage formés par des faisceaux de fibres
92.
OUTDOOR/INDOOR OPTICAL CABLES WITH LOW-FRICTION SKIN LAYER
An optical fiber cable having reduced surface friction may include a low-friction, fire retardant cable jacket structure. The cable jacket structure may include a thicker, highly fire-retardant cable jacket, and a thinner, low-friction skin layer formed over the cable jacket.
H01B 7/17 - Protection contre les dommages provoqués par des facteurs extérieurs, p. ex. gaines ou armatures
H01B 7/29 - Protection contre les dommages provoqués par des facteurs extérieurs, p. ex. gaines ou armatures par des températures extrêmes ou par les flammes
In accordance with a plurality of embodiments of the present invention, exemplary systems and articles of manufactures are described herein that are configured to propagate a MM signal from a light source, such as an optical fiber assembly for propagating a multimode (MM) signal from a light source, the optical fiber assembly comprising a multicore fiber (MCF) having a fiber numerical aperture (NA) value, a first core diameter and a first outer diameter (OD), and a combiner including a taper fiber bundle (TFB) portion in communication with the MCF, and at least one pigtail portion in communication with the light source, wherein the combiner propagates the MM signal from the light source, the MM signal having a signal NA value that is less than the fiber NA value such that the MM signal underfills the at least one pigtail portion.
A method of splicing multicore optical fibers to one another for use in a data network. First and second multicore optical fibers each have a number of cores arranged in a certain pattern about the fiber axis, thus defining a number of pairs of cores wherein the cores of each pair are arrayed symmetrically with respect to a key plane that includes the fiber axis. Ends of the first and the second fibers are arranged in axial alignment to one another such that the key plane at the end of the first fiber is aligned with the key plane at the end of the second fiber, thereby placing a defined pair of cores in the first fiber in position for splicing to a corresponding defined pair of cores in the second fiber. The defined pairs of cores in the two fibers are then spliced to one another.
A system (e.g., an optical amplifier) comprising gain fibers (e.g., Bismuth-doped optical fiber) for amplifying optical signals. The optical signals have an operating center wavelength (λ0) that is centered between approximately 1260 nanometers (~1260nm) and ~1360nm (which is in the O-Band). The gain fibers are optically coupled to pump sources, with the number of pump sources being less than or equal to the number of gain fibers. The pump sources are (optionally) shared among the gain fibers, thereby providing more efficient use of resources.
An optical fiber amplifier is formed to include a grating structure inscribed within the rare earth-doped gain fiber itself, providing distributed wavelength- dependent filtering (attenuation) and minimizing the need for any type of gain- flattening filter to be used at the output of the amplifier. The grating structure may be of any suitable arrangement that provides the desired loss spectrum, for example, similar to the profile of a prior art discrete GFF. Various types of grating structures that may be used to provide distributed wavelength-dependent filtering along the gain include, but are not limited to, tilted gratings, weak Bragg gratings, long-period grating (LPG), and any suitable combination of these grating structures.
An optical probe includes an optical source that generates an optical beam that propagates from a proximal end to a distal end of an optical fiber that imparts a transformation of a spatial profile of the optical beam. An optical control device imparts a compensating spatial profile on the optical beam that at least partially compensates for the transformation of the spatial profile of the optical beam imparted by the optical fiber in response to a control signal from a signal processor. A distal optical source generates a calibration light that propagates through the one or more optical waveguides from the distal end to the proximal end of the optical fiber. An optical detector detects the calibration light and generates electrical signals in response to the detected calibration light. The signal processor generates the control signal to instruct the optical control device to impart the compensating spatial profile on the optical beam that at least partially compensates for the transformation of the spatial profile of the optical beam imparted by the optical fiber.
G01J 3/44 - Spectrométrie RamanSpectrométrie par diffusion
G05D 25/02 - Commande de la lumière, p. ex. intensité, couleur ou phase caractérisée par l'utilisation de moyens électriques
A61B 1/06 - Instruments pour procéder à l'examen médical de l'intérieur des cavités ou des conduits du corps par inspection visuelle ou photographique, p. ex. endoscopesDispositions pour l'éclairage dans ces instruments avec dispositifs d'éclairement
G02B 6/04 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage formés par des faisceaux de fibres
A61B 1/07 - Instruments pour procéder à l'examen médical de l'intérieur des cavités ou des conduits du corps par inspection visuelle ou photographique, p. ex. endoscopesDispositions pour l'éclairage dans ces instruments avec dispositifs d'éclairement utilisant des moyens conduisant la lumière, p. ex. des fibres optiques
G01J 3/02 - SpectrométrieSpectrophotométrieMonochromateursMesure de la couleur Parties constitutives
Described herein are systems, methods, and articles of manufacture for reducing coupling loss between optical fibers, more particularly, to reducing coupling loss between a hollow-core optical fiber (HCF) and another fiber, such as solid core fibers (SCF), through the use of mismatched mode field diameter (MFD). According to one embodiment, an article is configured to reduce a coupling loss between multiple optical fibers, wherein the article includes an HCF supporting the propagation of a first mode and an SCF coupled to the HCF. According to a further embodiment, a method is described for reducing the coupling loss or splicing loss between optical fibers, such as an exemplary HCF and a solid core SMF. These exemplary methods may include coupling/splicing an exemplary HCF to an exemplary SMF with significantly smaller MFD.
G02B 6/00 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage
G02B 6/255 - Épissage des guides de lumière, p. ex. par fusion ou par liaison
A fiber-optic cable having optical fibers that are arranged as a rollable ribbon. Water-swellable material (e.g., superabsorbent liquid, superabsorbent powder, superabsorbent adhesive, etc.) is applied directly to the rollable ribbon, thereby eliminating the need to incorporate conventional water-absorbing yarns, tapes, or other such similar materials. The rollable ribbon is surrounded by a tube, with a dielectric strength member positioned external to the tube and substantially parallel to the tube. A jacket, with a ripcord along a substantial length of the jacket, surrounds the tube. Also taught is a process for manufacturing a rollable-ribbon fiber-optic cable, in which a water-swellable material is applied directly to the rollable ribbon, thereby eliminating the need to incorporate conventional water-absorbing yarns, tapes, or other such similar materials.
