Abrégé

A hollow-core microstructured fiber with additive marks, and a preform and a drawing detection method. The fiber comprises a cladding hollow-core sleeve (3) and a plurality of anti-resonant microstructured units (1) arranged on and attached to an inner wall of the cladding hollow-core sleeve (3), wherein each anti-resonant microstructured unit (1) is used for forming an air fiber core region having the size of an inscribed circle of the anti-resonance microstructured unit (1); the plurality of anti-resonant microstructured units (1) are rotationally symmetrical; one or more additive mark units (2) are provided on an outer side of a fiber core, such that an end-face structure of the hollow-core microstructured fiber has asymmetry; and the area of each additive mark unit (2) accounts for 0.002%-2% of the area of the cladding hollow-core sleeve (3). By means of each additive mark unit (2), each anti-resonant microstructured unit (1) is marked and identified during drawing detection, and the geometric uniformity of the hollow-core microstructured fiber is determined.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A hollow-core microstructured fiber with refractive index marks (2), and a preparation method therefor and a detection method. The fiber comprises a cladding hollow-core sleeve (3) and a plurality of anti-resonant microstructured units (1) arranged on an inner wall of the cladding hollow-core sleeve (3), wherein the plurality of anti-resonant microstructured units (1) are rotationally symmetric; the cladding hollow-core sleeve (3) is provided with one or more refractive index mark units (2); there is the refractive index difference between the refractive index of each refractive index mark unit (2) and the refractive index of the cladding hollow-core sleeve (3); and an end-face structure of the hollow-core microstructured fiber has asymmetry.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A hollow-core fiber having an azimuth mark and a hollow-core fiber end face detection method. The fiber comprises a cladding hollow-core sleeve and a plurality of anti-resonant microstructure units arranged and adhered to the inner wall of the cladding hollow-core sleeve uniformly in the circumferential direction; a hollow area surrounded by the anti-resonant microstructure units is a fiber core; and there is at least one anti-resonant microstructure unit of which the azimuth is different from that of at least one of the other anti-resonant microstructure units. By using the azimuth mark, the anti-resonant microstructure units in the hollow-core fiber can be quickly distinguished while the complexity of optical fiber preparation is not improved and the optical fiber transmission performance is hardly affected, and the geometric uniformity of the anti-resonant microstructure units can be conveniently controlled on line.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• G01B 11/00 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques

Produits et services

Electronic and optical communications instruments and components, namely, optical data links; Recorded computer software using artificial intelligence (AI) for facial and speech recognition; Electronic notice boards; Network servers; Surveying apparatus and instruments; Optical glasses; Fiber optic cables; Electric cables and wires; Optical cables; Junction sleeves for fibre optics; Data synchronization cables; Cables for optical signal transmission; Electronic chips for the manufacture of integrated circuits; Conductors, electric; Optical fibres

Abrégé

A hollow-core microstructured fiber with subtractive mark units (2). The fiber comprises a cladding hollow-core sleeve (3) and a plurality of anti-resonant microstructured units (1) arranged on and attached to an inner wall of the cladding hollow-core sleeve (3), wherein each anti-resonant microstructured unit (1) is used for forming an air fiber core region having the size of an inscribed circle; the plurality of anti-resonant microstructured units (1) are rotationally symmetrical; one or more subtractive mark units (2) are provided on an outer side of a fiber core, such that an end-face structure of the hollow-core microstructured fiber has asymmetry; each subtractive mark unit (2) is a trench or a through hole; and the area of each subtractive mark unit (2) accounts for 0.002%-2% of the area of the cladding hollow-core sleeve (3). By means of each subtractive mark unit (2), each anti-resonant microstructured unit (1) can be marked and identified during drawing detection, and the geometric uniformity of the hollow-core microstructured fiber is determined.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A method for detecting the end face of a hollow-core microstructure optical fiber, comprising the steps: (1) imaging the end face of the hollow-core microstructure optical fiber to obtain an end face image of the hollow-core microstructure optical fiber; (2) marking anti-resonance microstructure units (2) in the end face image of the hollow-core microstructure optical fiber on the basis of the asymmetry of the end face of the hollow-core microstructure optical fiber; and (3) performing geometric parameter extraction, and determining the geometric uniformity of the hollow-core microstructure optical fiber. Also provided is a marked hollow-core microstructure optical fiber.

Classes IPC  ?

• G01M 11/00 - Test des appareils optiquesTest des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs

Produits et services

Optical data media; quantity indicators; Facial recognition apparatus; plotters; electronic notice boards; Network communication equipment; camcorders; close-up lenses; surveying apparatus and instruments; optical glass; micrometer screws for optical instruments; fibre optic cables; materials for electricity mains [wires, cables]; optical cables; graphite electrodes; chips [integrated circuits]; conductors, electric; video screens; optical fibres [light conducting filaments]; batteries, electric. Advertising; market studies; import-export agency services; marketing; provision of an online marketplace for buyers and sellers of goods and services; sales promotion for others; Sales promotion for others via short videos; personnel management consultancy; secretarial services; book-keeping; sponsorship search; retail services for pharmaceutical, veterinary and sanitary preparations and medical supplies. Radio program broadcasting; broadcasting of television programmes; mobile telephone communication services; communications by fibre optic networks; streaming of data; radio communications; rental of telecommunication equipment; providing telecommunications connections to a global computer network; providing online forums; communications by computer terminals; satellite transmission; computer aided transmission of messages and images; videoconferencing services; providing online virtual reality-based forums for work collaboration.

Produits et services

(1) Camcorders; close-up lenses for cameras; digital indicators; digital plotters; electric wires and cables; electrical conductor cables; electronic circuit cards; electronic notice boards; facial recognition software; fibre optic cables; graphite electrodes; integrated circuits; lithium batteries; micrometer screws for optical instruments; multiplexers for fibre-optic communications networks; optical cables; optical fibres; optical glass; surveying instruments; video screens

Abrégé

A ribbon optical fiber unit (1), an optical cable and a method for preparing a ribbon optical fiber unit. The ribbon optical fiber unit (1) comprises an outer layer (1.1), which has a ribbon channel, and a plurality of optical fibers (1.2), wherein the plurality of optical fibers (1.2) are arranged side by side, and stored into the outer layer (1.1); a water-blocking filler (1.3) is uniformly distributed between the optical fibers (1.2) and the outer layer (1.1); the outer layer (1.1) has in an axial direction at least first phases (1.1.1) and second phases (1.1.2), which are alternately distributed; and the second phases (1.1.2) stretch across the optical fibers (1.2), which are arranged side by side, in a lateral direction of the ribbon optical fiber unit (1). The optical cable comprises the ribbon optical fiber unit (1). The method for preparing a ribbon optical fiber unit comprises the following steps: a plurality of optical fibers (1.2) being released from a pay-off stand, and sequentially passing through a forming die and a coating cavity; the plurality of optical fibers (1.2) being fixed by means of the forming die so as to be arranged side by side, and the plurality of optical fibers (1.2) arranged side by side being filled with a water-blocking filler (1.3) and then entering the coating cavity; and first phases (1.1.1) and second phases (1.1.2), which are alternately distributed in the axial direction, being formed. In the ribbon optical fiber unit (1), the plurality of optical fibers (1.2) are arranged side by side by using the outer layer (1.1), which is similar to a sleeve, such that the ribbon optical fiber unit (1) has the advantages of a welding efficiency of an optical fiber ribbon being high and the density of the optical fibers (1.2) being high, and also has the characteristic of stress on the optical fibers (1.2) being relatively small.

Classes IPC  ?

• G02B 6/08 - 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 la position relative des fibres étant la même aux deux extrémités, p. ex. pour transporter des images le faisceau de fibres ayant la forme d'une plaque

Abrégé

The present invention relates to a system and method for depositing a quartz glass cylinder. The system comprises a deposition chamber, wherein upper and lower rotating chucks are provided in the deposition chamber; blowtorches arranged at intervals in an up-down direction are provided corresponding to the upper and lower rotating chucks; the upper and lower rotating chucks or the blowtorches are connected to an up-down movement device; and one side of the deposition chamber is communicated with a gas inlet chamber, and the other side of the deposition chamber is communicated with a gas pumping chamber. The system is characterized in that each blowtorch comprises a raw gas nozzle and a fuel gas nozzle, the outermost ring of the blowtorch nozzle is provided with an annular gas nozzle, and the annular gas nozzle is in communication with a temperature-adjustable gas source. According to the present invention, the annular gas nozzle ejects gas to form a cylindrical gas curtain, and a cover in front of the blowtorch is replaced with the gas curtain stabilizing gas flow, so that gas of a deposition area can be confined in a gas ring, and a stable gas flow field is provided for a reaction area of silicon dioxide, thereby ensuring the consistency of the whole deposition process. Moreover, the temperature of the gas introduced into the gas ring may gradually change with the deposition process, thereby realizing uniform temperature distribution of upper and lower thermal fields of the deposition area, and thus improving the deposition quality.

Classes IPC  ?

• C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
• C03B 19/01 - Autres méthodes de façonnage du verre par fusion progressive d'une poudre de verre sur un substrat de formage, c.-à-d. accrétion

Abrégé

A miniaturized inner core structure for a fiber optic preformed end and a combination kit. The inner core structure comprises: an inner core main body (1), one end of the inner core main body (1) being a first connecting end, and the periphery of the inner core main body (1) being provided with a step (106); a ferrule (3), the ferrule (3) being connected to the first connecting end; and a connecting nut (6), the periphery of the connecting nut (6) being provided with an external thread (601) for matching and connecting to internal threads of different kits, and the connecting nut (6) being sleeved on the periphery of the inner core main body (1) and being limited by the step (106). The inner core structure itself can be connected to adapters, serves as a miniaturized connector, can also be assembled with different kits, is compatible with fiber optic adapters of different models, can also be assembled with a traction cap (11), and is used for pipe penetration construction.

Classes IPC  ?

• G02B 6/38 - Moyens de couplage mécaniques ayant des moyens d'assemblage fibre à fibre

Abrégé

Disclosed in the present invention are an air blown optical cable suitable for a high-temperature installation working environment and a construction method therefor. The air blown optical cable comprises a sheath and a cable core accommodated in the sheath. The sheath is made of a polymer thermoplastic material of which the Vicat softening point is between 60°C and 90°C. According to the present invention, by optimizing the thermodynamic performance of the material of the sheath, the problem of sharp shortening of the air blown distance of air blown optical cables due to the temperature change of an external working environment is solved, the influence of the temperature of a construction working environment does not need to be specially considered, a construction window period is widened, and the popularization and application of an air blown installation technology are more easily accepted; the limitation of application areas of air blown optical cables is solved; no matter in summer or winter, and in cold areas of the northern hemisphere or in tropical areas of the southern hemisphere, air blown optical cable products of the same type can be used as long as air blowing is performed in pipelines of the same specification, without performing multiple product developments.

Classes IPC  ?

• 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 6/46 - Procédés ou appareils adaptés à l'installation de fibres optiques ou de câbles optiques

Abrégé

An integrated hollow-core optical fiber preform, an optical fiber and a manufacturing method therefor. The method comprises manufacturing an initial preform by means of using a drilling method, and then feeding a gas into holes during a drawing process to perform pressurization control, so as to manufacture an optical fiber having an anti-resonant ring structure. The method uses mechanical drilling to achieve accurate positioning of the azimuth angle of an anti-resonant unit and further ensure axial uniformity, so as to avoid deflection of the azimuth angle during the drawing process. In addition, no other materials is introduced for positioning the anti-resonant unit, such that contamination caused by impurities is reduced, thereby lowering the attenuation and improving the strength property of the optical fiber. Besides, during the drawing process, the anti-resonant unit is expanded by means of air pressure control, so that the wall thickness of the anti-resonant unit is further reduced, thereby lowering the attenuation of the hollow-core optical fiber.

Classes IPC  ?

• C03B 37/012 - Fabrication d'ébauches d'étirage de fibres ou de filaments
• C03B 37/027 - Fibres constituées de différentes variétés de verre, p. ex. fibres optiques
• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/032 - Fibres optiques avec revêtement le noyau ou le revêtement n'étant pas un solide

Abrégé

Disclosed in the present invention are a full-dry tube unit using water-blocking powder, and an optical cable. The tube unit comprises a loose tube, and an optical fiber assembly and water-blocking powder which are accommodated in the loose tube. The loose tube at least comprises an innermost inner-layer tube. The inner-layer tube is made from polybutylene terephthalate or polycarbonate, and has an inner-surface friction coefficient of 0.21-0.34. The water-blocking powder is polymer precursor powder containing 0.3-1g/cm3 of sodium polyacrylate, and has a water absorption expansion rate of ≥12mm/min. Further disclosed in the present invention is an optical cable, which comprises said optical fiber tube unit. In the present invention, by means of surface treatment on the inner surface of the loose tube, the friction coefficient of the inner surface of the loose tube is controlled within a proper range, so that an enough amount of water-blocking powder having performance meeting the requirements is attached and fixed to the inner wall, which, while achieving a water-blocking effect, avoids the problems of water-blocking powder coming off and accumulation in erected cables and relieves the phenomena of bending-related accumulation. Furthermore, in cooperation with water-blocking powder size selection, water-blocking powder coming off and accumulation are avoided as much as possible.

Classes IPC  ?

• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Abrégé

The present disclosure provides a hollow-core microstructure optical fiber preform, an optical fiber, and a method for manufacturing thereof. An objective of the present disclosure is to introduce a support sheet into a nested structure unit of the hollow-core microstructure optical fiber preform, which not only increases the number of reflection surfaces without increasing the number of nested layers of glass tubes, but also achieves a more accurate positioning by the support sheet and improves manufacturing accuracy as compared to a tangential structure of nested glass tubes, such that the following technical problems, difficulty in controlling a curvature of reflection surfaces, low manufacturing accuracy, large difference between actual loss and theoretical loss, or poor batch consistency, in related anti-resonance optical fibers, caused by increasing the number of layers of nested microstructure units in order to increase the number of reflection surfaces, are solved.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• C03B 37/012 - Fabrication d'ébauches d'étirage de fibres ou de filaments

Abrégé

A low-dispersion single-mode optical fiber includes a core and a cladding covering the core. The core has a relative refractive index difference of 0.30-0.65% and a radius of 2.5-4.5 μm. The cladding layer including first, second, third cladding layers and an outer cladding arranged sequentially from inside to outside. The first cladding layer covers the core, and has a relative refractive index difference of −0.70% to −0.30% and a radius of 4.5-7.5 μm. The second cladding layer covers the first cladding layer, and has a relative refractive index difference of −0.20% to 0.25% and a radius of 7.0-12.0 μm. The third cladding layer covers the second cladding layer, and has a relative refractive index difference of −0.60% to 0.00% and a radius of 10.0-20.0 μm. The outer cladding covers the third cladding layer, and is a layer made of pure silicon dioxide glass.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A low-dispersion single-mode fiber includes a core and claddings covering the core. The core layer has a radius in a range of 3-5 μm and a relative refractive index difference in a range of 0.15% to 0.45%. The claddings comprise a first depressed cladding, a raised cladding, a second depressed cladding, and an outer cladding arranged sequentially from inside to outside. The first depressed cladding has a unilateral width in a range of 2-7 μm and a relative refractive index difference in a range of −0.4% to 0.03%. The raised cladding has a unilateral width in a range of 2-7 μm and a relative refractive index difference in a range of 0.05% to 0.20%. The second depressed cladding has a unilateral width in a range of 0-8 μm and a relative refractive index difference in a range of 0% to −0.2%. The outer cladding is formed of pure silicon dioxide glass.

Classes IPC  ?

• G02B 6/36 - Moyens de couplage mécaniques
• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A multi-core multi-mode optical fiber, which comprises a plurality of core layers and a common outer cladding layer and is characterized in that there are two, four, or eight core layers; the core layers are uniformly distributed in the circumferential direction at equal intervals; the distance between adjacent core layers among two core layers is 38 to 60 μm and is 38 to 48 μm among four or eight core layers; each core layer is sequentially coated from inside to outside by an inner cladding layer and a sunken cladding layer; and a multi-core homogeneous multi-mode optical fiber is formed. The refractive index profile of the core layers is parabola-shaped, α is 1.9 to 2.1, a core layer R1 is 12 to 20 μm, a core layer Δ1max is 0.7% to 1.7%, the singe-sided width of the inner cladding layer is 0.5 to 2.5 μm, Δ2 is -0.4% to 0.0%, the single-sided width of the sunken cladding layer is 3 to 7 μm, Δ3 is -0.7% to -0.9%, and the common outer cladding layer is a pure silicon dioxide layer. Multi-mode transmission in a wavelength range of 850 nm to 950 nm and single-mode transmission in an O waveband/C waveband can be supported at the same time, and the structure and viscosity matching of the optical fiber can also be optimized to reduce attenuation so that comprehensive performance, such as crosstalk of the optical fiber, macro-bending and micro-bending loss of each channel and so on, is at a good level.

Classes IPC  ?

• 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

Abrégé

The present invention relates to the field of optical communications. Disclosed is an optical module, comprising a multi-path optical transmitting device and a multi-path optical receiving device. A multi-path transmitter component comprises a metal member adhered to a circuit board. An upper part of the multi-path transmitter component is used for placing elements such as a multi-path laser, a PLC chip, and a lens. The laser is electrically connected to the circuit board by means of gold wire welding. The laser passes an optical light through the lens located between the PLC chip and the laser. A laser light emitted by a corresponding laser is coupled into a corresponding PLC chip port, is multiplexed, and then enters an optical fiber component, and is output to an external optical fiber by means of an optical interface. The multi-path optical receiving device directly places a photodiode and a transimpedance amplifier onto the circuit board. An external optical signal enters the optical fiber component by means of the optical interface, is split by an optical beam splitter, and then reflected into a corresponding photodiode for optical reception, which achieves the conversion from the optical signal to an electrical signal. The element used for packaging can be reduced, and the volume is reduced.

Classes IPC  ?

• H04B 10/25 - Dispositions spécifiques à la transmission par fibres
• H04B 10/50 - Émetteurs
• H04B 10/60 - Récepteurs

Abrégé

The present invention relates to the field of optical communications. Disclosed is an AOC optical module connection inspection method and device. An AOC optical module comprises an active optical cable (AOC), and a first end optical module and a second end optical module that are connected by the AOC. Display lamps are provided in both the first end optical module and the second end optical module. Optical power is sent to the first end optical module according to a preset manner, and the second end optical module records a reported value of received optical power; after the first end optical module sends the optical power, the display lamp in the first end optical module performs light-on indication according to a target frequency of a target detection mode corresponding to the variation law of sent optical power; and when the second end optical module detects that the variation law of the received optical power satisfies the target detection mode, the display lamp in the second end optical module performs light-on indication according to the target frequency. In the present invention, positioning of modules on two ends of the AOC and detection of the connection state of the AOC optical module are achieved without adding a hardware circuit, so that the cost is low, implementation is simple and convenient, and transmission service is not affected.

Classes IPC  ?

• H04L 12/26 - Dispositions de surveillance; Dispositions de test
• G01M 11/00 - Test des appareils optiquesTest des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs
• G01R 31/44 - Tests de lampes
• H04B 10/25 - Dispositions spécifiques à la transmission par fibres
• H04B 10/50 - Émetteurs
• H04B 10/60 - Récepteurs

Abrégé

A high-bandwidth bend-insensitive multimode fiber includes a core laver and a cladding including an inner cladding, a depressed cladding, and an outer cladding arranged sequentially from inside to outside. The core layer is a silicon dioxide glass layer co-doped with germanium, phosphorus (P), and fluorine (F) and has a refractive index profile in a shape of a parabola, a distribution index in a range of 2.0-2.3, a radius in a range of 23-27 μm, and a maximum relative refractive index difference in a range of 0.9-1.2% at its center. A contribution amount of P at the center is in a range of 0.01-0.30%. A doping amount of F increases from the center to the edge of the core layer. A contribution amount of F at the center and edge of the core layer is in range of 0.0% to −0.1%, and −0.40% to −0.20%, respectively.

Classes IPC  ?

• 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

Abrégé

A low-dispersion single-mode optical fiber, comprising a core layer and a cladding layer, the radius R1 of the core layer being 3μm to 5μm, the relative refractive index difference Δ1 of the core layer being 0.15% to 0.45%; the cladding layer has a first recessed cladding layer, a protruding cladding layer, a second recessed cladding layer, and an outer cladding layer sequentially from inside to outside; the first recessed cladding layer has a single-side width (R2-R1) of 2μm to 7μm, and a relative refractive index difference Δ2 of -0.4% to -0.03%; the protrusion cladding layer has a single-side width (R3-R2) of 2μm to 7μm, and a relative refractive index difference Δ3 of 0.05％ to 0.20％; the second recessed layer has a single-side width (R4-R3) of 0μm to 8μm, and a relative refractive index difference Δ4 of 0％ to -0.2％; and the outer cladding layer is a pure silica glass layer. The present invention has a core cladding layer which is rationally designed and a process which is easy to control, is compatible with the existing G.652 optical fibers, and can have low dispersion in the band of 1270nm to 1380nm.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

Disclosed is a low-dispersion single-mode optical fiber, comprising a fiber core layer and a cladding layer, wherein the core layer has a relative refractive index difference Δ1 of 0.30% - 0.65% and a radius R1 of 2.5 μm-4.5 μm, and the cladding layer is divided, from inside to outside, into three cladding sub-layers and an outer cladding layer. The core layer is coated with a first cladding sub-layer, which has a relative refractive index difference Δ2 of -0.70% to -0.30% and a radius R2 of 4.5 μm - 7.0 μm. The first cladding sub-layer is coated with a second cladding sub-layer, which has a relative refractive index difference Δ3 of -0.20% - 0.25% and a radius R3 of 7.0 μm - 12.0 μm. The second cladding sub-layer is coated with a third cladding sub-layer, which has a relative refractive index difference Δ4 of -0.60% - 0.00% and a radius R4 of 10.0 μm - 20.0 μm. The third cladding sub-layer is coated with the outer cladding layer, which is a pure silicon dioxide glass layer. A cut-off wavelength of an optical fiber cable is less than 1260 nm, the overall dispersion is low for a wave band of 1260 nm - 1460 nm, the attenuation performance is good, and the optical fiber cable is particularly suitable for a WDM transmission system for a wave band of 1260 nm - 1460 nm.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A polarization-maintaining multi-core fiber includes a plurality of fiber core areas and a main outer cladding. The fiber core areas include one central fiber core area, and two or more than two outer fiber core areas equidistantly and uniformly arranged around the central fiber core area that is a polarization-maintaining fiber core area. Each outer fiber core area includes a fiber core and an inner cladding surrounding a core layer. A portion outside the fiber core areas is the main outer cladding. The fiber can greatly enhance spectral efficiency of an optical transmission system, and improve fiber communication capacity. The arrangement of the polarization-maintaining fiber core area provides a waveguide structure with a function of maintaining polarized light, which can be used for transmission of local light.

Classes IPC  ?

• G02B 6/24 - Couplage de guides de lumière
• G02B 6/024 - Fibres optiques avec revêtement avec des propriétés maintenant la polarisation
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

An array-type polarization-maintaining multi-core fiber includes a main outer cladding, fiber core units, and stress units. The fiber core units and the stress units are arranged to form a unit array including one central unit and any unit in the unit array being equidistantly arranged from adjacent units thereof. Provided is at least one pair of stress units, each pair of stress units being arranged symmetrical about one fiber core unit to form a polarization-maintaining fiber core unit. The fiber core units each include a fiber core and an inner cladding surrounding a core layer. A portion outside the fiber core units and the stress units is the main outer cladding. The fiber can greatly enhance spectral efficiency of an optical transmission system, and improve fiber communication capacity.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/024 - Fibres optiques avec revêtement avec des propriétés maintenant la polarisation
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A photonic crystal fiber, a preform thereof, a preparation method, and use. The preform comprises a glass filament (1) used for forming a fiber core, a glass filament (2) used for forming an inner cladding fluorine-doped unit, an inner cladding glass casing (3), and an outer cladding glass casing (5); the glass filament (1) used for forming the fiber core has a relative refractive index difference, Δ1, from 0.08% to 0.09% and a diameter from 1 mm to 4mm; the glass filament (2) used for forming the inner cladding fluorine-doped unit has an outer diameter identical to that of the glass filament used for forming the fiber core, comprises a cladding, and a core layer having a relative refractive index difference, Δ2, from -0.14% to -0.82%, said cladding material being the same as that of the inner cladding glass casing (3); the inner cladding glass casing (3) has a thickness between 2mm and 20mm and a relative refractive index difference, Δ3, from 0.08% to 0.1%; the outer cladding glass casing (5) has a thickness between 30mm and 90mm and an equivalent refractive index from 1.22 to 1.25. The optical fiber has relative high absorption for pumped light and converts same to a signal light at a needed band, achieves an extremely large mode field area, and has excellent light beam quality.

Classes IPC  ?

• C03B 37/012 - Fabrication d'ébauches d'étirage de fibres ou de filaments
• C03B 37/014 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques
• C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur

Abrégé

A flexible optical fiber ribbon loose tube optical cable, comprising an outer sheath (10) and a cable core. The cable core is formed by twisting a plurality of loose tubes (3), and is characterized in that the loose tubes (3) are flexible loose tubes (3) and laminated optical fiber ribbons (1) are sheathed within the flexible loose tubes (3). The flexible optical fiber ribbon loose tube optical cable has a small diameter and a large optical fiber capacity, and branching and connection are convenient. The flexible loose tubes (3) have the mechanical and corrosion-resistant performance of conventional loose tubes (3), and also have excellent flexibility and bending performance so that the loose tubes (3) and the optical cable may reach a smaller radius of curvature without bending, may be laid within a narrow and small space, and may better protect optical fiber units in the tubes, reduce the failure rate of optical cable lines, and improve the reliability of communication lines, especially facilitating the indoor laying of optical cables; during splicing disk retention, the size of a required junction box is also correspondingly smaller, the fiber capacity rate of an optical cable router is high, and costs are low. The optical cable also has strong tensile and anti-compressive performance, has good waterproof performance, and may be suitable for laying and construction in complex indoor and outdoor environments.

Classes IPC  ?

• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Produits et services

Electric sensors; optical fiber connectors; blank optical data carriers; fiber optics; cables for optical signal transmission; electric cables and wires; fiber optic cables; computer network adapters, switches, routers and hubs; computer peripheral devices; data processing equipment, namely, couplers

Abrégé

A small core-diameter graded-index optical fiber include a core layer and a cladding having an inner cladding layer, a depressed cladding layer, and an outer cladding layer from inside to outside thereof. The core layer has a parabolic refractive index profile with a distribution index in a range of 1.9-2.1, a radius in a range of 10-21 μm, and a Δ1 max in a range of 0.7-1.7% at a core layer center, and is a silica glass layer co-doped with germanium, phosphorus, and fluoride. The inner cladding layer is a pure silica layer or an F-doped silica glass layer, and has a unilateral width in a range of 0.5-5 μm and a Δ2 in a range of −0.4-0%. The depressed cladding layer has a unilateral width in a range of 2-10 μm and a Δ3 in a range from −0.8% to −0.2%. The outer cladding layer is a pure silica glass layer.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• 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

Abrégé

An anti-cracking panda-type polarization-maintaining optical fiber includes a cladding layer, stress layers, and a fiber core. The fiber core is located in the center of the cladding layer. The stress layers are located symmetrically at two sides of the fiber core with a distance away from the fiber core and are located within the cladding layer. Each stress layer is enclosed at edges of their outer sides by a transition layer with a gradient refractive index. By providing the transition layer with the gradient refractive index at the edge of the outer side of the stress layer, the pressure stress at the edge of the stress layer is decomposed and released, so as to avoid cracks at the edge of the polished stress layer on the end of the optical fiber, and thus optimizes the performance of the polarization-maintaining optical fiber by decreasing the room temperature polishing cracking rate.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/024 - Fibres optiques avec revêtement avec des propriétés maintenant la polarisation
• G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif

Abrégé

A high bandwidth radiation-resistant multimode optical fiber includes a core and a cladding layer surrounding the core. The core is a fluorine-doped quartz glass layer with a graded refractive index distribution and a distribution power exponent α of 1.7-2.2. The core has R1 of 15-35 μm and Δ1%min of −0.8% to −1.2%. The cladding layer has an inner cladding layer having R2 of 15-38 μm and Δ2% of −0.8% to −1.2% and/or a depressed inner cladding layer having R3 of 15-55 μm and Δ3 of −1.0% to −1.4%, an intermediate cladding layer having R4 of 15.5-58 μm and Δ4 of −0.7% to −0.2% a depressed cladding layer hasving R5 of 16-60 μm and Δ5 of −0.8% to −1.2%, and an outer cladding layer sequentially formed from inside to outside. The outer cladding layer is a pure silica glass layer.

Classes IPC  ?

• 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

Abrégé

A rare earth-doped double-clad optical fiber includes a rare earth ion-doped fiber core, an inner cladding layer, and an outer cladding layer. A cross section of the inner cladding layer is a non-circular plane including at least two arcuate notches. According to the provided optical fiber, optical processing can be performed on a preform without changing a preform preparation process and a drawing process. The inner cladding is designed to have a non-circular planar structure having a cross section with at least two arcuate notches. While maintaining the same light absorption efficiency of pump light within the cladding layer, a preform polishing process is simplified, a risk of cracking the preform during polishing of multiple surfaces and a risk of contamination of the preform caused by impurities are reduced, wire drawing control precision is better, and comprehensive performance of the optical fiber is improved.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• 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
• G02B 6/02 - Fibres optiques avec revêtement
• H01S 3/067 - Lasers à fibre optique
• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré

Produits et services

Sensors; optical apparatus and instruments; optical data media; optical fibres [light conducting filaments]; optical communication equipment; materials for electricity mains [wires, cables]; fiber optic cables; network communication equipment; computer peripheral devices; couplers [data processing equipment].

Abrégé

A high-bandwidth bending-insensitive multimode optical fiber, comprising a core layer and a cladding layer, the cladding layer comprises an inner cladding layer, a depressed cladding layer and an outer cladding layer distributed from inside to outside in sequence, the refractive index profile of the core layer is of a parabola shape, the distribution index α of the core layer ranges from 2.0 to 2.3, the radius R1 of the core layer ranges from 23 μm to 27 μm, the maximal relative refractive index difference Δ1max of the center of the core layer ranges from 0.9% to 1.2%, the core layer is a germanium Ge, phosphorus P and fluorine F co-doped silica glass layer, the contribution amount ΔP0 of P at the center of the core layer ranges from 0.01% to 0.30%, the contribution amount ΔP1 of P at the interface between the core layer and the inner cladding layer ranges from 0.01% to 0.30%, the content of P at the center of the core layer is consistent with the content of P at the edge of the core layer, the doping amount of F is gradually increased from the center of the core layer to the edge of the core layer, the contribution amount ΔF0 of F at the center of the core layer ranges from 0.0% to -0.1%, and the contribution amount ΔF1 of F at the edge of the core layer ranges from -0.4% to -0.20%. The optical fiber material composition and the structural design of the core layer are reasonable, reducing the chromatic dispersion, improving the bandwidth performance, and reducing the attenuation of the optical fiber.

Classes IPC  ?

• 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

Abrégé

A multimode optical fiber includes a core and a cladding covering the core. The core has a radius in a range of 23.75-26.25 μm. A refractive index profile of the core has a graded refractive index distribution with a refractive index distribution index α in a range of 1.80-1.89. The core has a maximum relative refractive index difference Δ1% in a range from 1.0% to 1.15%. The multimode optical fiber has a fusion loss less than or equal to 0.08 dB. The multimode optical fiber is applied in a middle-and-long distance distributed temperature-measuring system, and a temperature-measuring distance of the system reaches 10 km to 27 km. The system includes a pulsed laser light source, a wavelength division multiplexer, an avalanche photodiode, a data acquisition device, an upper computer, and the temperature-measuring multimode optical fiber.

Classes IPC  ?

• G01J 5/00 - Pyrométrie des radiations, p. ex. thermométrie infrarouge ou optique
• G01K 11/32 - 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
• G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif
• G01J 3/02 - SpectrométrieSpectrophotométrieMonochromateursMesure de la couleur Parties constitutives

Abrégé

F,min. A mass percentage of fluorine content of the core changes with the radius according to a function. The cladding successively comprises an inner cladding, a trench cladding, and an outer cladding from inside to outside. The optical fiber reduces bandwidth-wavelength sensitivity while improving bandwidth performance; is compatible with existing OM3/OM4 multimode optical fibers, and support wavelength-division multiplexing technology in a wavelength range of 850-950 nm.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• 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
• H04J 14/02 - Systèmes multiplex à division de longueur d'onde

Produits et services

Computer peripheral devices; couplers [data processing equipment]; optical data media; optical communication equipment; network communication equipment; materials for electricity mains [wires, cables]; fiber optic cables; optical fibres [light conducting filaments]; sensor.

Abrégé

core thereof is 7-10 μm, and a relative refractive index difference Δ1 thereof is 0.20% to 0.40%. A range of ΔGe is 0.30% to 0.60%, and a range of ΔF is −0.05% to −0.15%. The cladding includes three layers. A first layer is a fluorine-germanium co-doped silicon-dioxide quartz glass layer, a relative refractive index difference Δ31 thereof is −0.02% to −0.10%, and a diameter D31 thereof is 15-30 μm. A second layer is a fluorine-doped silicon-dioxide quartz glass layer, a relative refractive index difference Δ32 thereof is −0.01% to −0.05%, and a diameter D32 thereof is 30-50 μm. A third layer is a pure silicon-dioxide quartz glass layer, and a diameter D33 thereof is 124-126 μm.

Classes IPC  ?

• G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif
• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/255 - Épissage des guides de lumière, p. ex. par fusion ou par liaison

Produits et services

Computer peripheral devices; data processing equipment, namely, couplers; blank optical data carriers; optical receivers; optical reflectors; network communication equipment, namely, computer network hubs; electric cables and wires; fiber optic cables; fiber optics; light conducting filaments; electric sensors

Abrégé

An optical fiber cable for vehicles, comprising: a main cable (6) and a branch cable (8), wherein the main cable (6) comprises a framework (4), a framework groove being provided on the outer periphery of the framework (4), while optical fiber (3) is laid in the framework groove, and the exterior of the framework (4) is covered by an outer protection sleeve (1); a head of one end or two ends of the main cable (6) is provided with a branching cable protection device (7), one side of the branching cable protection device (7) being connected to the main cable (6), while another side leads out the branch cable (8); the branch cable (8) comprises the optical fiber (3) which branches from the main cable (6) and a casing (10) which is sleeved on the exterior of the optical fiber (3). The structure is simple in structure and lightweight, while being small in size, flexible, having strong lateral pressure resistance, and may be evenly bent such that the optical cable may withstand complex usage environments and may be easily installed in small radius bends in a vehicle. The optical cable has an all-medium structure, may be used in ordinary cars, may be applied in power-on maintenance of high-voltage vehicles, may also be applied in signal monitoring in special high-voltage environments and special strong electric field environments, may be directly pulled out when connected, and is easy to use and install.

Classes IPC  ?

• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Abrégé

A high-bandwidth anti-radiation multi-mode optical fiber, having both excellent anti-bend performance and high bandwidth, comprising a core layer and a cladding layer. The core layer is a fluorine-doped quartz glass layer in a gradually-varied refractive index distribution, α is 1.7-2.2, Δ1%min of the core layer is -0.8% to -1.2%, the radius R1 is 15-35 μm, the cladding layer outside the core layer is sequentially provided with an inner cladding layer and/or a sinking inner cladding layer, a middle cladding layer, a sinking cladding layer and an outer cladding layer from inside to outside; the radius R2 of the inner cladding layer is 15-38 μm, the relative refractive index difference Δ2% is -0.8% to -1.2%, the radius R3 of the sinking inner cladding layer is 15-55 μm, the relative refractive index difference Δ3 is -1.0% to -1.4%, the radius R4 of the middle cladding layer is 15.5-58 μm, the relative refractive index difference Δ4 is -0.7% to -0.2%, the radius R5 of the sinking cladding layer is 16-60 μm, the relative refractive index difference Δ5 is -0.8% to -1.2%, and the outer cladding layer is a pure silica glass layer.

Classes IPC  ?

• 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

Abrégé

An optical fiber with ultra-low attenuation and large effective-area includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 4.8-6.5 μm, and a relative refractive index difference of −0.06% to 0.10%. The inner cladding layer has a radius of 9-15 μm, and a relative refractive index difference of about −0.40% to −0.15%. The trench cladding layer has a radius of about 12-17 μm, and a relative refractive index difference of about −0.8% to −0.3%. The auxiliary outer cladding layer has a radius of about 37-50 μm, and a relative refractive index difference of about −0.6% to −0.25%. The outer cladding layer is a pure silicon-dioxide glass layer.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

Disclosed is a double-clad fibre doped with rare earth, comprising a fibre core doped with rare earth ions, an inner cladding and an outer cladding, wherein the cross section of the inner cladding is a non-circular plane including at least two bow-shaped notches. The optical fibre can perform optical machining on a preform without changing a preform preparation process and a fibre-drawing process. The cross section of the inner cladding is designed to be a non-circular plane structure including at least two bow-shaped notches, such that while maintaining the same cladding pump-light absorbing efficiency, a preform grinding process can be simplified, and the rate of breakage due to multi-face grinding of a preform, and the risk of being polluted by machining impurities are reduced, thereby facilitating fibre drawing and the control of precision, and improving the comprehensive performance of an optical fibre.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement
• 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

Abrégé

A crack-resistant panda polarization-maintaining optical fiber comprises a cladding layer (3), stress layers (2), and a core (1). The core (1) is located at the center of the cladding layer (3). The stress layers (2) are spaced apart symmetrically with respect to the two sides of the core (1) and located in the cladding layer (3). The outer peripheral edges of the stress layers (2) are surrounded by a graded index transition layer. By disposing the graded index transition layer at the outer peripheral edges of the stress layers (2), stress at the edges of the stress layers (2) is decomposed and released, preventing the edge of a polished stress layer at the end surface of the optical fiber from cracking, such that performance of the polarization-maintaining optical fiber is improved; after the improvement, a room temperature polishing cracking rate is reduced from 30% to 0.1%, and an optical fiber rupture rate under temperature cycling is reduced from 50% to 0.3%. The panda polarization-maintaining optical fiber for a device achieves significant improvements in various performances, improved reliability, and the optical fiber can be used in more severe environment conditions.

Classes IPC  ?

• G02B 6/024 - Fibres optiques avec revêtement avec des propriétés maintenant la polarisation

Abrégé

4≤−0.14%. The outer cladding layer is a pure silicon dioxide glass layer and/or a metal-doped silicon dioxide glass layer.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• 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 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• C03C 13/04 - Fibres optiques, p. ex. compositions pour le cœur et la gaine de fibres

Abrégé

A single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.9-4.8 μm and a relative refractive index difference of −0.08% to 0.10%. The inner cladding layer has a radius of 9-14 μm and a relative refractive index difference of −0.40% to −0.15%. The trench cladding layer has a radius of 13-25 μm and a refractive index difference of −0.7% to −0.3%. The auxiliary outer cladding layer has a radius of 30-50 μm and a relative refractive index difference of −0.4% to −0.15%. The outer cladding layer is a pure silicon dioxide glass layer.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• C03C 13/04 - Fibres optiques, p. ex. compositions pour le cœur et la gaine de fibres
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A bending-insensitive single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.0 to 3.9 μm and a relative refractive index of −0.04% to 0.12%. The inner cladding layer has a radius of 8 to 14 μm and a relative refractive index −0.35% to −0.10%. The trench cladding layer has a radius of 14 to 20 μm and a relative refractive index of −0.6% to −0.2%. The auxiliary outer cladding layer has a radius of 35 to 50 μm and a relative refractive index of −0.4% to −0.15%. The outer cladding layer is a pure silica glass layer.

Classes IPC  ?

• 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 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif

Abrégé

Provided are an indoor and outdoor rodent-resistant optical cable and a manufacturing method therefor. The optical cable comprises a cable core and an outer sheath (9), wherein the cable core comprises a plurality of flexible casing tubes (1), the flexible casing tubes (1) cladding optical communication units, the cable core is clad with an inner sheath (7) that is a low-smoke, halogen-free and flame-retardant inner sheath, non-metallic reinforcing pieces (5) are inlaid in the inner sheath (7), and a non-metallic rodent-resistant material layer (8) winds around the inner sheath (7) and the non-metallic rodent-resistant material layer (8) is clad with the outer sheath (9).

Classes IPC  ?

• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Abrégé

1 of −0.06% to 0.10%, and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The inner cladding layer has a radius of 9 to 15 μm and a relative refractive index difference of −0.40% to −0.15%. The trench cladding layer has a radius of 12 to 17 μm and a relative refractive index difference of −0.8% to −0.3%. The auxiliary outer cladding layer has a radius of 37 to 50 μm and a relative refractive index difference of −0.6% to −0.25%. The outer cladding layer is a pure-silicon-dioxide glass layer.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A high-bandwidth anti-bending multimode optical fiber comprises a core layer and a wrapping layer. The refractive index section of the core layer is parabola-shaped, and the distribution index is α. The radius R1 of the core layer is 23 μm to 27 μm, the maximum relative refraction index difference Δ1max of the center position of the core layer is 0.9% to 1.2%. The core layer is a germanium-fluoride co-doped silicon dioxide glass layer, the center of the core layer has a minimum fluorine doping amount, and the fluorine content mass percent is CF,min. The fluorine content mass percent of the core layer changes with the radius and is distributed according to a function. The wrapping layer sequentially comprises an inner wrapping layer, a recessed wrapping layer and an outer wrapping layer from inside to outside. When the bandwidth performance of the optical fiber is improved, the bandwidth-wavelength sensitivity is reduced. The optical fiber not only can be compatible with an existing OM3/OM4 multimode optical fiber, but also can support a wavelength-division multiplexing technology within the wavelength range of 850 nm to 950 nm, so that the transmission capacity of the optical fiber is effectively improved. The optical fiber has excellent anti-bending performance and can be applicable to an access network and a small optical device.

Classes IPC  ?

• 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

Abrégé

A light intensity adjustable ultraviolet device for curing an optical fiber coating includes a cylindrical mounting base; a UVLED light source module mounted along a peripheral direction and an axial direction in an inner cavity of the cylindrical mounting base; a cylindrical focusing lens configured in front of a light emitting surface of the UVLED light source module, so that ultraviolet light emitted by the UVLED light source module is focused on a curing axis; and an ultraviolet sensor mounted in the inner cavity of the cylindrical mounting base, wherein the ultraviolet sensor is connected to a UVLED power supply control module via an ultraviolet intensity signal processing module; the UVLED power supply control module is connected to the UVLED light source module, so that an optical fiber drawing speed and an ultraviolet intensity form a control closed loop.

Classes IPC  ?

• C03C 25/64 - SéchageDéshydratationDéshydroxylation
• C03C 25/12 - Procédés généraux de revêtementDispositifs à cet effet
• H05B 33/08 - Circuits pour faire fonctionner des sources lumineuses électroluminescentes
• G01J 1/42 - Photométrie, p. ex. posemètres photographiques en utilisant des détecteurs électriques de radiations
• B05D 3/06 - Traitement préalable des surfaces sur lesquelles des liquides ou d'autres matériaux fluides doivent être appliquésTraitement ultérieur des revêtements appliqués, p. ex. traitement intermédiaire d'un revêtement déjà appliqué, pour préparer les applications ultérieures de liquides ou d'autres matériaux fluides par exposition à des rayonnements

Abrégé

Disclosed is an intensity adjustable UV curing equipment for optical fiber coating, comprising a cylindrical mounting base. A UVLED light source module is circumferentially and axially provided in the inner cavity of the cylindrical mounting base, and a cylindrical focusing lens is arranged in front of the light-emitting surface of the UVLED light source module so that the UV light emitted by the UVLED light source module is focused along a curing axis; an UV sensor is provided in the inner cavity of the cylindrical mounting base and connected with a UVLED power control module by means of the UV intensity signal processing module, and the UVLED power control module is connected with the UVLED light source module so that a control closed-loop is formed by the drawing speed of the optical fiber and the UV intensity.

Classes IPC  ?

• C03C 25/64 - SéchageDéshydratationDéshydroxylation
• C03C 25/66 - Traitement chimique, p. ex. lixiviation, traitement acide ou alcalin

Abrégé

A single mode optical fiber with ultra-low attenuation and bend insensibility for an optical communication transmission system, comprises a core layer and a cladding layer. The core layer has a radius r1 of 3.0-3.9 micrometers and a relative refractive index difference Delta n1 of -0.04% to 0.12%. The core layer is coated inside-to-outside orderly with an inner cladding, a depressed inner cladding, an auxiliary outer cladding and an outer cladding. The inner cladding has a radius r2 of 8-14 micrometers and a relative refractive index difference Delta n2 of -0.35% to -0.10%, the depressed inner cladding has a radius r3 of 14-20 micrometers and a relative refractive index difference Delta n3 of -0.6% to -0.2%, the auxiliary outer cladding has a radius r4 of 35-50 micrometers and a relative refractive index difference Delta n4 of -0.4% to -0.15%, and the outer cladding is a pure silica glass layer. Alkali metal doping is added into the core layer to optimize core layer viscosity. The fiber not only has a low attenuation coefficient and an excellent bending performance, but also can be compatible with the G657.A2 standard. The fiber manufacturing cost is low.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

The present invention relates to an ultra-low attenuation large effective area single-mode optical fiber, comprising a core layer and claddings. The radius r1 of the core layer is 4. 8 to 6. 5μm, and the relative refractive index differenceΔn1 of the core layer is -0. 06% to 0. 10%. The core layer is cladded sequentially from the inside out with an inner cladding, a sunken inner cladding, an auxiliary outer cladding and an outer cladding. The radius r2 of the inner cladding of the optical fiber is 9 to 15μm and the relative refractive index differenceΔn2 ranges from -0. 40% to -0. 15%; the radius r3 of the sunken inner cladding is 12 to 17μm and the relative refractive index differenceΔn3 ranges from -0. 8% to -0. 3%; the radius r4 of the auxiliary outer cladding is 37-50μm and the relative refractive index differenceΔn4 ranges from -0. 6% to -0. 25%; and the outer cladding is a pure silica glass layer. The core layer of the fiber is doped with alkali metal to optimize the core layer viscosity. Therefore, the fiber not only has a low attenuation coefficient, large effective area and low manufacturing cost, but also has, in an application waveband, good performance parameters including the cutoff wavelength, bending loss and dispersion.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Produits et services

Fibre optic cables; optical fibers [fibres] [light conducting filaments]; light conducting filaments [optical fibers [fibres]]; electricity conduits; optical communication equipment; radiotelephony sets; cables, electric; telephone wires; junction sleeves for electric cables; materials for electricity mains [wires, cables].

Abrégé

A doping optimized single-mode optical fibre with ultralow attenuation, which comprises a core layer, wherein the core layer is wrapped from inside to outside successively by an inner cladding, a depressed inner cladding, an auxiliary outer cladding and an outer cladding; the content of fluorine in the core layer is less than or equal to 0.5 wt%, the relative index of refraction contribution of germanium is less than or equal to 0.12%, and Δn1 is less than or equal to 0.12%; the content of fluorine in the inner cladding is 0.5-1.5 wt%, and Δn2 is less than or equal to -0.14%; the content of fluorine in the depressed inner cladding is 1-3 wt%, and Δn3 is less than or equal to -0.25%; the content of fluorine in the auxiliary outer cladding is 0.5-2 wt%, and Δn4 is less than or equal to -0.14%; and the outer cladding is a pure silica glass layer and/or a metal-doped silica glass layer. The viscosity of the core layer is reduced in the optical fibre, so that the core layer can better match with the inner cladding and the depressed cladding; and in combination with matching with the viscosity of the outer cladding by metal doping, the overall virtual temperature of the optical fibre is reduced, and at the same time through the design of the depressed cladding, the basic mode leakage is restrained, thereby realizing ultralow attenuation.

Classes IPC  ?

• 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

Abrégé

Disclosed is an optical cable having a full-dry type non-metal self-supporting skeleton, which comprises an outer sheath (6) and a skeleton (2), wherein an outer periphery of the skeleton (2) is circumferentially provided with longitudinal fibre slots at intervals, an optical communication unit (5) is provided in each of the longitudinal fibre slots, a non-metal central reinforcing part (1) passes through the centre of the skeleton (2), the outer periphery of the skeleton (2) is sequentially wrapped by a waterproof part (3) and a non-metal reinforcing part (4), and the outermost layer is wrapped by the outer sheath (6). The beneficial effects are as follows: 1. a skeleton type optical cable structure is used, and the interior and the exterior of the skeleton (2) are provided with the non-metal reinforcing parts (1, 4), so that the optical cable has a high strength, a good tensile property, and a large overhead span; 2. the optical fibre has a high packaging density, and the optical cable has a relatively smaller diameter; 3. a separating window can be provided easily and the optical fibre can be separated and extracted through the separating window, facilitating the construction and connection, and the full-dry type structure is more convenient for the construction, connection and maintenance; and 4. the all-dielectric structure thereof can be used in a power transmission line, is resistant to lightning and insusceptible to electromagnetic interferences, capable of being laid without a power cut, facilitates separating and winding of the optical fibres, has a high success rate of laying, and uses a smaller amount of cables.

Classes IPC  ?

• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Abrégé

An ultralow attenuation single mode optical fiber comprises a core layer and a cladding. The core layer has a radius r1 of 3.9 to 4.8 μm, and a relative refractive index difference Δn1 of -0.08% to 0.10%. The core layer is sequentially coated from inside to outside by an inner cladding, a depressed inner cladding, an auxiliary outer cladding and an outer cladding. The inner cladding has a radius r2 of 9 to 14 μm, and a relative refractive index difference Δn2 of -0.40% to -0.15%. The depressed inner cladding has an r3 of 13 to 25 μm, and a range of a relative refractive index difference Δn3 of -0.7% to -0.3%. The auxiliary outer cladding has an r4 of 30 to 50 μm, and a range of a relative refractive index difference Δn4 of -0.4% to -0.15%. The outer cladding is a pure silica glass layer. The optical fiber has ultralow attenuation performance, comprehensive performance parameters of a cut-off wavelength, a bending loss, and dispersion, etc. thereof are good in an application waveband, and are compatible to a G652 standard. A wider depressed cladding structure further improves the optical fiber bending loss.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

Disclosed is an ultralow-attenuation bend-insensitive single-mode optical fibre, comprising a core layer and cladding layers. The radius r1 of the core layer is 3.0 to 3.9 μm; the relative refractive index Δn1 of the core layer is -0.04% to 0.12%; the core layer is sequentially wrapped by an inner cladding layer, a sunken inner cladding layer, an auxiliary outer cladding layer and an outer cladding layer from the inside to the outside; the radius r2 of the inner cladding layer is 8 to 14 μm; the relative refractive index Δn2 is -0.35% to -0.10%; the radius r3 of the sunken inner cladding layer is 14 to 20 μm; the relative refractive index Δn3 is -0.6% to -0.2%; the radius r4 of the auxiliary outer cladding layer is 35 to 50 μm; and the relative refractive index Δn4 is -0.4% to -0.15%. The optical fibre has a lower attenuation coefficient and an excellent bending property, and by rationally designing the section of core and cladding layers of the optical fibre, the optical fibre has an MFD equal to or greater than 8.4. Parameters of the optical fibre, such as cutoff wavelengths, bending loss and chromatic dispersion, are good on an applied frequency band, and the optical fibre can be compatible with the G657.A2 standard.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A radiation curable coating for an optical fiber comprises 20-70wt% of epoxy polyurethane (meth)acrylate oligomer, 20-70wt% of an active monomer diluent, 1-10wt% of a photoinitiator, 1-10wt% of an assistant, and 0.1-2wt% of a molecular weight regulator. By adding a molecular weight regulator in the coating, the molecular weight and the curing degree can be adjusted in the radiation curing process of the coating, and accordingly mechanical performance of the coating is changed.

Classes IPC  ?

• C09D 133/08 - Homopolymères ou copolymères d'esters de l'acide acrylique
• C09D 133/10 - Homopolymères ou copolymères d'esters de l'acide méthacrylique
• C09D 175/14 - Polyuréthanes comportant des liaisons non saturées carbone-carbone
• C09D 7/12 - Autres adjuvants
• C08G 18/67 - Composés non saturés contenant un hydrogène actif
• C08G 18/48 - Polyéthers

Abrégé

A radiation curable coating for optical fiber, comprising: 20-70 wt% of epoxy polyurethane (methyl) acrylates oligomer, 20-70 wt% of active monomer diluent, 1-10 wt% of photoinitiator and 1-10 wt% of auxiliary; the epoxy polyurethane (methyl) acrylates is obtained via a chemical reaction between the polyurethane (methyl) acrylates and the epoxy (methyl) acrylates, and has better uniformity and stability.

Classes IPC  ?

• C09D 133/08 - Homopolymères ou copolymères d'esters de l'acide acrylique
• C09D 133/10 - Homopolymères ou copolymères d'esters de l'acide méthacrylique
• C09D 175/14 - Polyuréthanes comportant des liaisons non saturées carbone-carbone
• C09D 7/12 - Autres adjuvants
• C08G 18/67 - Composés non saturés contenant un hydrogène actif
• C08G 18/48 - Polyéthers

Abrégé

A bend-insensitive multimode optical fiber includes a core layer, and cladding layers surrounding the core layer. The core layer has a parabolic refractive index profile with α being 1.9-2.2, a radius being 23-27 μm, and a maximum relative refractive index difference being between 0.9-1.2%. The inner cladding layer has a width being 1-3 μm and a relative refractive index difference being between −0.05% and 0.1%. The trench cladding layer has a width being 2-5 μm and a relative refractive index difference being between −1% and −0.3%. The core layer is a Ge/F co-doped silica glass layer, where an F doping contribution at a central position of the core layer is less than or equal to 0%, an F doping contribution at an edge portion of the core layer is greater than or equal to −0.45%. The outer cladding layer is a pure silica glass layer.

Classes IPC  ?

• 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

Abrégé

31 at an innermost interface.

Classes IPC  ?

• G02B 6/36 - Moyens de couplage mécaniques
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A single-mode fiber with ultra-low attenuation and a large effective area comprises a core layer and a cladding layer. The core layer is sequentially coated by an inner cladding layer, a depressed inner cladding layer, an auxiliary outer cladding layer and an outer cladding layer from inside to outside. The radius r1 of the core layer is 4.8 to 6.5 micrometers, the relative refractive index difference delta n1 of the core layer is -0.06% to 0.10%; the radius r2 of the inner cladding layer is 9 to 15 micrometers, the relative refractive index difference delta n2 is -0.40% to 0.15%; the radius r3 of the depressed inner cladding layer is 12 to 17 micrometers, the relative refractive index difference delta n3 is -0.8% to -0.3%; the radius r4 of the auxiliary outer cladding layer is 37 to 50 micrometers, the relative refractive index difference delta n4 is -0.6% to -0.25%; and the outer cladding layer is a pure silica glass layer. The single-mode fiber has not only a low attenuation coefficient, a large effective area, low manufacturing cost, but also good parameters of comprehensive performance including cutoff wavelength, bending loss and dispersion etc. in its application bands.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

2 when the related parameters thereof are optimized.

Classes IPC  ?

• G02B 6/36 - Moyens de couplage mécaniques
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A device and method for manufacturing an optical fiber preform outside the tube; the device comprises a rack, a rotating chuck and a blast burner assembly; the rotating chuck or blast burner assembly is connected to a movable base; the blast burner assembly communicates with fuel gas and a chemical raw material supply system; the present invention is characterized by having a plasma generator; and the inlet end of the plasma generator communicates with a doping source, and the outlet end of the plasma generator is connected to a spray head. The device and method utilize a plasma generator to plasmatize gas containing F or other doping elements, thus increasing the doping efficiency of the outside method, and avoiding the problem of preform powder cracks caused by excessive content of doped F. The device is additionally provided with an atomizer, improving solution ionization.

Classes IPC  ?

• C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur

Abrégé

A bending insensitive single mode optical fibre, comprising a core and a cladding. The diameter of the core is 7.6μm - 8.4μm, and the relative refractive index difference Δ1 thereof is 4.66 × 10—3 ~ 6.12 × 10—3. The cladding outside the core comprises an inner cladding, a hollow outer cladding and an outer cladding in sequence from inside to outside. The diameter of the inner cladding is 17.4μm - 20μm, and the relative refractive index difference Δ2 thereof is -0.1 × 10—3 ~ 0.1 × 10—3. The diameter of the hollow outer cladding is 28μm - 32μm, and the relative refractive index difference Δ3 thereof is -4.37 × 10—3~-7.25 × 10—3. By optimizing the depth and width of the hollow outer cladding of the optical fibre, the optical fibre not only has a lower additional bending loss, but also has a stable mechanical property and a uniform material composition. On the basis of keeping effective mode field diameters and bending properties, the process control difficulty is reduced, and the processing efficiency of an optical fibre preform is improved. The optical fibre is far superior to the ITU-TG.657. B3 standard in various performance, so that the requirements of FTTH network laying and device miniaturization can be satisfied.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A dispersion compensation fiber comprises a fiber core and cladding. The fiber core is a core layer mainly doped with germanium and having a positive relative refractive index difference. The cladding covering the fiber core comprises a trench cladding mainly doped with fluorine, an annular cladding mainly doped with germanium, a matching cladding mainly doped with fluorine, and an outermost mechanical cladding in order. Relative refractive index differences of the fiber core and the claddings are respectively: Δ1% being 1.55% to 2.20%, Δ2% being −0.55% to −0.30%, Δ3% being 0.40% to 0.65%, Δ4% being −0.20% to −0.01%, and Δ5% being 0. Radius ranges, from R1 to R5, of the fiber core and the claddings are respectively: R1 being 1.4 to 1.7 μm, R2 being 4.1 to 4.8 μm, R3 being 6.7 to 8.8 μm, R4 being 10 to 17 μm, and R5 being 38 to 63 μm.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

The invention relates to a rotary seal chuck of an optical fiber preform rod deposition lathe, comprising a fixed socket sleeve and a rotary shaft. The fixed socket sleeve is provided with a central hole base. The central hole base bears the rotary shaft through a bearing. An end of the central hole base is connected to an air hose. The rotary shaft is a hollow rotary shaft provided with a through hole. One end of the through hole communicates with the air hose, and the other end of the through hole is provided with a liner tube connecting sealing hole base. A magnetic fluid seal ring is disposed at a joint between an inner side of the rotary shaft and the central hole base of the fixed socket sleeve, to form a rotary dynamic seal. An outer side of the rotary shaft is connected to a rotary driving disk.

Classes IPC  ?

• B23B 31/00 - Mandrins de serrageMandrins extensiblesLeurs adaptations à la commande à distance
• C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur

Abrégé

A low-attenuation single-mode optical fiber, comprising a fiber core layer and cladding layers; the fiber core layer is sequentially cladded with a first inner cladding layer and a second inner cladding layer; the fiber core layer has a radius R1 of 3.5 μm - 5 μm, and a relative refractive index difference Δn1 of 0.2%-0.4%; the first inner cladding layer has a radius R2 of 6.5 μm - 11 μm, and a relative refractive index difference Δn2of -0.06%-0%; the second inner cladding layer has a radius R3 of 15 μm - 30 μm, and a relative refractive index differenceΔn3 of -0.02%-0.05%; and the outermost layer is an outer cladding layer of pure silicon dioxide quartz. The optical fiber employs a double inner cladding layer structure, thus allowing for a more reasonable design of the refractive-index profile of the optical fiber, and the dopant for the fiber core layer and the cladding layers is optimized so as to reduce the viscosity of the fiber core material to match the viscosity of the fiber core layer and the cladding layers, thus effectively reducing the increased optical fiber attenuation resulting from concentration of the stress in the fiber core portion caused by tension from pulling the wires. In addition to the full compatibility with the G.652 standard, the optical fiber has much better attenuation performance than the conventional G.652 optical fiber.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement

Abrégé

A low attenuation single mode optical fiber includes a core layer and claddings. The core layer has the relative refractive index difference (RRID) Δ1 ranging from −0.1% to +0.1% and the radius R1 ranging from 4.0 μm to 6.0 μm. The claddings have three claddings layers surrounding the core layer. The RRID of the first cladding layer Δ2 ranges from −0.2% to −0.6%, and the radius R2 thereof ranges from 10 μm to 22 μm. The RRID of the second cladding layer Δ3 is less than Δ2. The RRID and radius of the first cladding layer and the RRID and radius of the second cladding layer satisfy the relationship of: V=(Δ2−Δ3)×(R3−R2), and the value of V ranges from 0.15% μm to 0.8% μm. The third cladding layer is all the layers that closely surround the second cladding layer, and the RRID of each layer is greater than Δ3.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• G02B 6/36 - Moyens de couplage mécaniques
• 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 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré

Abrégé

31 at an innermost interface.

Classes IPC  ?

• G02B 6/02 - Fibres optiques avec revêtement
• 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

Abrégé

A single-mode fiber with a large effective area comprises a fiber core layer and an outer covering layer. The fiber core layer covers a middle covering layer, and a sunk covering layer is disposed outside the middle covering layer. The fiber core layer comprises a first fiber core sublayer and a second fiber core sublayer. The first fiber core sublayer has a radius r1 of 1.5μm to 5 μm and a relative refractive index difference Δn1 of 0.05 to 0.22%; the second fiber core sublayer has a unilateral radial width (r2-r1) of 1.5μm to 5 μm and a relative refractive index difference Δn2 of 0.15% to 0.34%; and Δn1 is less than Δn2. A larger effective area is obtained by means of a design of a refractive index profile of the fiber, and a better balance is obtained with aspect to a cutoff wavelength and bending performance and the like. The fiber can reach an effective area equal to or greater than 120μm2. The single-mode fiber is suitable for a high-speed large-capacity and long-distance transmission system and a long-distance repeaterless transmission system.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

An optical fiber with a large effective area, comprising a fiber core layer and a cladding layer; the fiber core layer comprises an inner core layer (1) and an outer core layer (2); the inner core layer (1) has a radius r1 of 1-4μm, and a relative refraction index difference Δ12 of -0.2%≤Δ12＜0% relative to the outer core layer (2),Δ12 remaining unchanged or incrementally increasing with the increase of the radius; the outer core layer (2) has a radius r2 of 4-7μm, and a relative refraction index difference Δ2 of -0.15%-0.05%; the cladding layer comprises an inner cladding layer (3), a recessed cladding layer (4), and an outer cladding layer (5); the inner cladding layer (3) is clad outside the fiber core layer, and has a radius r3 of 7-20μm, and a relative refraction index difference Δ3 of -0.5%~-0.1%; the recessed cladding layer (4) has a radius r4 of 12-40μm, and a relative refraction index difference Δ4 of -1.0%~-0.3%; and the outer cladding layer (5) has a relative refraction index difference Δ5 of -0.2%~-0.4%. The optical fiber has a larger effective area, lower transmission loss, and good bending characteristic, thus being particularly suitable for a long-distance, high-speed and large-capacity communication system.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A plasma microwave resonant cavity used for a plasma chemical vapor deposition (PCVD) apparatus comprises a resonant cavity housing and a waveguide device connected with the cavity housing. Two ends of the cavity housing are provided with coaxial through-holes along the axial direction of the cavity. A glass inner liner is arranged through the through-holes at the two ends, and runs through a cavity body and the through holes at the two ends. The glass inner liner comprises a glass cylinder and glass stop rings arranged at the two ends of the glass cylinder. One or two ends of the glass cylinder are provided with external threads. The glass stop rings are connected with the ends of the glass cylinder by screw holes formed on the glass stop rings.

Classes IPC  ?

• C23C 16/00 - Revêtement chimique par décomposition de composés gazeux, ne laissant pas de produits de réaction du matériau de la surface dans le revêtement, c.-à-d. procédés de dépôt chimique en phase vapeur [CVD]
• C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
• C23C 16/511 - Revêtement chimique par décomposition de composés gazeux, ne laissant pas de produits de réaction du matériau de la surface dans le revêtement, c.-à-d. procédés de dépôt chimique en phase vapeur [CVD] caractérisé par le procédé de revêtement au moyen de décharges électriques utilisant des décharges à micro-ondes
• H01J 37/32 - Tubes à décharge en atmosphère gazeuse

Abrégé

A method and device for automatically controlling the temperature of optical fiber coatings are disclosed. The device comprises an optical fiber coating device (3) provided with a heating chamber (4), wherein the heating chamber (4) of the optical fiber coating device (3) is communicated with a circular heater (7) through a circulating pipeline (5). Liquid heat-conducting media (8) is filled in the heating chamber (4), the circulating pipeline (5) and the circular heater (7), and the circular heater (7) is used for heating coating (2) in the optical fiber coating device (3) by circularly heating the liquid heat-conducting media (8). A processing control unit is arranged for controlling the heating process of the circular heater (7) by acquiring a wire drawing speed sensing signal and a liquid heat-conducting medium temperature sensing signal and comparing the signals with preset parameter values. Thus the automatic control and adjusting process for the temperature of the coating in the optical fiber coating device (3) is realized.

Classes IPC  ?

• C03C 25/12 - Procédés généraux de revêtementDispositifs à cet effet
• 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
• B05C 3/00 - Appareillages dans lesquels un ouvrage est mis en contact avec une grande quantité de liquide ou autre matériau fluide

Abrégé

A method and a device for automatically controlling the temperature of optical fiber coatings in a wiredrawing process. The device comprises an optical fiber coating device (4), wherein a coating cavity of the optical fiber coating device (4) is communicated with a charging bucket by a charging pipeline. The device is characterized in that the charging pipeline is externally provided with a controllable heater (6) which is used for heating the coatings in the charging pipeline, the charging pipeline is also provided with a processing control unit which is used for comparing an acquired wiredrawing speed sensing signal and charging pipeline temperature sensing signal with a preset parameter numerical value, so as to control the heating process of the controllable heater (6), so that the automatic controlling and adjusting process of the temperate of the coatings in the optical fiber coating device (4) can be realized. According to the device and the method, the temperature of the coatings in an optical fiber wiredrawing process can be automatically changed along with the wiredrawing speed, so that the temperature or the viscosity of the coatings can be well matched with the wiredrawing speed, and therefore, the quality of a coating layer on the surface of the optical fiber can be guaranteed, and the machining yield of the optical fiber can be improved.

Classes IPC  ?

• C03C 25/20 - Mise en contact des fibres avec des applicateurs, p. ex. des rouleaux

Abrégé

A fully dry, central tube-type air blown micro optical fiber, comprising an outer sheath (5), and a loose tube (2) inside and covered by the outer sheath (5). Optical fibers (1) are disposed inside of the loose tube (2). The inside of the loose tube (2) is coated with water-proof yarn (3). Vertical grooves are provided on the outer surface of the outer sheath (5) along the circumferential direction. The fully dry, central tube-type air blown micro optical fiber has a small diameter and light weight. The vertical grooves on the outer surface of the outer sheath is conducive to optical cable stripping, lowers the friction between the optical cable and the tube wall during cable jetting, and facilitates air flow. The use of water-proof yarn removes the cleaning process during optical fiber connection, and shortens the fiber fusion.

Classes IPC  ?

• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Abrégé

A method for manufacturing an optical fiber preform, including: a) providing a lining tube as a substrate tube, and doping and depositing by a PCVD or an MCVD process; b) in the reacting gas of silicon tetrachloride and oxygen, introducing a fluorine-containing gas for fluorine doping, introducing germanium tetrachloride for germanium doping, ionizing the reacting gas in the lining tube through microwaves to form plasma, depositing the plasma on the inner wall of the lining tube in the form of glass; c) after the completion of deposition, processing the deposited lining tube into a solid core rod by melting contraction through an electric heating furnace; d) sleeving the solid core rod into a pure quartz glass jacketing tube and manufacturing the two into an optical fiber preform; and e) allowing the effective diameter d of the optical fiber preform to become between 95 and 205 mm.

Classes IPC  ?

• C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
• C03B 37/027 - Fibres constituées de différentes variétés de verre, p. ex. fibres optiques
• G02B 6/028 - Fibres optiques avec revêtement le noyau ou le revêtement ayant un indice de réfraction progressif
• C03B 37/012 - Fabrication d'ébauches d'étirage de fibres ou de filaments
• C03B 37/014 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques
• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
• G02B 6/02 - Fibres optiques avec revêtement
• C03C 13/04 - Fibres optiques, p. ex. compositions pour le cœur et la gaine de fibres

Abrégé

31. The fiber has a good bending resistance, good mechanical properties, and extended service lifetime, and prevents the additional stresses generated by bending from passing on to the core, thereby reducing attenuation.

Classes IPC  ?

• G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples

Abrégé

A multimode fiber including a core and a cladding. The core has a radius (R1) of 24-26 μm, the refractive index profile thereof is a parabola, and the maximum relative refractive index difference (Δ1) is 0.9-1.1%. The cladding surrounds the core and includes from inside to outside an inner cladding, a middle cladding, and an outer cladding; a radius (R2) of the inner cladding is 1.04-1.6 times that of the core, and a relative refractive index difference (Δ2) thereof is −0.01-0.01%; the middle cladding is a graded refractive index cladding whose radius (R3) is 1.06-1.8 times that of the core, and a relative refractive index difference thereof is decreased from Δ2 to Δ4; and a radius (R4) of the outer cladding is 2.38-2.63 times that of the core, and a relative refractive index difference (Δ4) thereof is between −0.20 and −0.40%. The invention reduces the additional bending loss of the fiber, improves the bending resistance and mechanical properties, basically eliminates the internal stress, and ensures the service life even working for a long term under the condition of low radius. The method for producing the fiber is simple, effective, and suitable for mass production.

Classes IPC  ?

• G02B 6/28 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux
• G02B 6/02 - Fibres optiques avec revêtement

Produits et services

Fibre (fiber (Am.)) optic cables; optical communication devices; network communication devices; cables, electric; wires, electric; materials for electricity mains (wires, cables); coaxial cables; quartz crystal oscillators; light conducting filaments (optical fibers (fibres)); optical fibers (fibres) (light conducting filaments).