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138 results about "Optical fiber fabrication" patented technology
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Polarization maintaining optical fiber with small bending radius and manufacture method of polarization maintaining optical fiber
ActiveCN103018821AImprove bending resistanceReduce disturbanceGlass making apparatusOptical fibre with polarisationInformation transmissionPolarization-maintaining optical fiber
The invention discloses a polarization maintaining optical fiber with a small bending radius and a manufacture method of the polarization maintaining optical fiber and relates to the field of optical fiber manufacture. The polarization maintaining optical fiber comprises a silica cladding, a core layer, a second silica cladding ring, a third fluorine-doped silica cladding ring and two stress cat eyes are sequentially arranged in the silica cladding from inside to outside, and the two stress cat eyes are in central symmetry with the core layer. By means of the manufacture method, the bending radius of the manufactured polarization maintaining optical fiber is smaller than 5mm, operating wavelength of the polarization maintaining optical fiber is 1550nm, and supplementary deterioration of the polarization maintaining optical fiber is under 0.4dB / km. According to the polarization maintaining optical fiber, under the condition that the bending radius is small, low-loss information transmission of the polarization maintaining optical fiber is achieved, low supplementary deterioration and good crosstalk characteristics of the polarization maintaining optical fiber are guaranteed, fiber optic sensors with small sizes can be manufactured by means of the polarization maintaining optical fiber, and requirements of users are satisfied.
Owner:RUIGUANG TELECOMM TECH CO LTD
Coated optical fibers using adhesion promoters, and methods for making and using same
InactiveUS20030129397A1Improve adhesionNot affecting cure speedLiquid surface applicatorsOptical fibre with multilayer core/claddingPolymer scienceSilylene
The present invention provides a radiation curable coating composition for forming a polymeric coating on a glass optical fiber, the composition comprising a mixture of: a base radiation curable liquid composition capable of forming a polymeric coating; at least one adhesion promoter selected from the group consisting of bis-silyl amines, diacrylated silane tertiary amine, acetoxy functional silanes, trifunctional isocyanurates and mixtures thereof, and 0 to about 10 percent by weight of one or more photoinitiators. The present invention also includes a coated optical fiber, a method for making an optical fiber and compositions containing adhesion promoters that do not undergo free radical reaction with base radiation curable pre-polymer of the composition.
Owner:BOODEN LTDZA
Method for manufacturing external coating layer of optical fiber preform rod through sleeve method
ActiveCN103086598AEasy to collapseAvoid wastingGlass making apparatusGlass productionManufacturing technologyOptical fiber fabrication
The invention discloses a method for manufacturing an external coating layer of an optical fiber preform rod through a sleeve method, belongs to an optical fiber manufacturing technology and aims to overcome the defects of sleeve waste and the like in the manufacturing of an external coating layer of an optical fiber preform rod through a sleeve method in the prior art. In the invention, a core rod is welded onto an auxiliary glass rod, an external diameter enlarged part is arranged at the welding position, and the whole core rod is concentrically inserted into a sleeve, thus forming an annular space between the external surface of the core rod and the internal surface of the sleeve; the circumference of the sleeve is provided with at least three recess parts for fixing the core rod; a blowtorch is used to heat the external diameter enlarged part which seals the sleeve and the core rod, and negative pressure is applied to the annular space; and the blowtorch is moved to heat the sleeve and the core rod, so that the sleeve can collapse onto the core rod to form a solid optical fiber preform rod. According to the invention, the sleeve utilization rate is high; the existing improved chemical vapor deposition equipment can be fully utilized, no additional equipment investment is required, the production cost can be lowered, and the production time can be saved; and the optical fiber preform rod manufactured by the method has favorable physical dimension.
Owner:FUTONG GROUP CO LTD +1
Optical fiber fabrication method
InactiveUS20150251945A1Improve productivityReduce the temperatureGlass fibre drawing apparatusOptical waveguide light guideHeating furnaceSlow cooling
An optical fiber manufacturing method includes a drawing step and a slow cooling step. In the slow cooling step, an optical fiber passes through a heating furnace having a temperature which is set such that in at least 70% of a region from a first position at which a glass outer diameter of the optical fiber becomes less than 500% of a final outer diameter to a second position at which a temperature T of the optical fiber becomes 1400° C., an actual temperature of the optical fiber is within ±100° C. of a target temperature Tt(n) for each position n. The target temperature Tt(n) is a temperature at which a fictive temperature Tf(n+1) of a core at a position n+1 determined by calculation using the recurrence formula “Tf(n+1)=T(n)+(Tf(n)−T(n))exp(−Δt(T(n)))” starting from a fictive temperature Tf(0) of the optical fiber at the first position n=0 is lowest.
Owner:SUMITOMO ELECTRIC IND LTD
Optical fiber fabrication method
ActiveCN104661975ALower fictive temperatureImprove productivityGlass fibre drawing apparatusOptical waveguide light guideHeating furnaceOptical fiber fabrication
An objective of the present invention is to provide a method whereby the fictive temperature is sufficiently reduced and it is possible to fabricate with high yield an optical fiber with low loss. In 70% or more of the region in the range from a first location wherein the glass outer diameter of the optical fiber reaches less than 500% of the final outer diameter to a second location wherein the temperature T of the optical fiber reaches 1400°C, the temperature of a furnace (20) is set such that, with n=0 being the first location and commencing from the fictive temperature Tf(0) in the first location, the difference is within ±100°C of a target temperature T(n) at each location n, the target temperature T(n) being the temperature at which Tf(n+1) reaches a minimum, Tf(n+1) being derived by carrying out a calculation by the recursive formula Tf(n+1)=T(n)+(Tf(n)-T(n))exp(-Δt / τ(T(n))), wherein Tf(n)is the fictive temperature of the core at a given location n in a fiber drawing step and an annealing step, Tf(n+1)is the fictive temperature of the core after a unit time Δt has elapsed, and τ(T(n)) is the structural relaxation constant of the material of the core in the target temperature T(n) at the location n.
Owner:SUMITOMO ELECTRIC IND LTD
High anti-damage energy transfer optical fiber and manufacturing method
InactiveCN101852886AHigh damage thresholdSimple manufacturing processCladded optical fibreGlass shaping apparatusFiberHigh power lasers
Owner:CHINA ELECTRONICS TECH GRP NO 23 RES INST
Apparatus for applying spin to optical fiber and optical fiber manufacturing method and apparatus
InactiveCN1599871AGlass fibre drawing apparatusOptical light guidesEngineeringPolarization mode dispersion
A method of applying spin to a coated optical fiber to be rotated on its longitudinal axis so that the optical fiber has an ultra-low PMD (Polarization Mode Dispersion) includes the steps of: guiding the coated optical fiber so as not to be deviated from a certain range off a drawing axis at a lower end of an optical fiber coating point; giving torque to the optical fiber by contacting the coated optical fiber with a driving roller which vibrates on the center of an axis substantially parallel to a drawing direction at a lower end of the guiding point; and adjusting an amplitude (A) of the driving roller and a distance (l) between the guiding point and the vibrating point so as to control an angle (Theta) between the vibrating optical and the drawing axis. This makes it possible to control a spin rate (spins / m) of the optical fiber generated by rotation.
Owner:LG CABLE INC
Polyimide coated optical fiber and machining process thereof
InactiveCN103941331ALong-term usePrecise diameter controlCladded optical fibreOptical waveguide light guideFiberMicrometer
The invention relates to the technical field of optical fiber manufacture, in particular to a polyimide coated optical fiber and a machining process thereof. The polyimide coated optical fiber comprises a bare optical fiber and a coating layer, the diameter of the bare optical fiber ranges from 80 micrometers to 660 micrometers, the coating layer externally coats the bare optical fiber, the bare optical fiber comprises a quartz core layer and a quartz cladding layer externally surrounding the quartz core layer, a polyimide coating layer externally coats the quartz cladding layer, and the thickness of a single edge of the polyimide coating layer ranges from 10 micrometers to 25 micrometers. Polyimide materials coat the surface of the bare optical fiber, and compared with a conventional coated optical fiber, the polyimide coated optical fiber has the advantages of high temperature resistance, aging resistance, radiation resistance, stability, durability and the like and can be used for a long time in a high-temperature hostile environment for a long time. The diameter of the coating layer can be accurately controlled, deviation of the diameter is + / -3 micrometers, and the concentricity of the coating layer and the fiber cladding layer is smaller than or equal to 5.
Owner:JIANGSU HENGTONG OPTICAL FIBER TECH
Optical fiber fabrication
ActiveUS20070230881A1Quality improvementEasy to disassembleGlass making apparatusLaser detailsEngineeringOptical fiber fabrication
Owner:LIEKKI OY
Apparatus for applying spin to optical fiber and optical fiber manufacturing method and apparatus using the same
InactiveUS20050163434A1Easy to manufactureEasy to controlGlass fibre drawing apparatusFilament handlingPolarization mode dispersionOptical fiber fabrication
A method of applying spin to a coated optical fiber to be rotated on its longitudinal axis so that the optical fiber has an ultra-low PMD (Polarization Mode Dispersion) includes the steps of: guiding the coated optical fiber so as not to be deviated from a certain range off a drawing axis at a lower end of an optical fiber coating point; giving torque to the optical fiber by contacting the coated optical fiber with a driving roller which vibrates on the center of an axis substantially parallel to a drawing direction at a lower end of the guiding point; and adjusting an amplitude (A) of the driving roller and a distance (l) between the guiding point and the vibrating point so as to control an angle (θ) between the vibrating optical and the drawing axis. This makes it possible to control a spin rate (spins / m) of the optical fiber generated by rotation.
Owner:LG CABLE LTD (KR)
Active optical fibers with wavelength-selective filtering mechanism, method of production and their use
ActiveUS8045259B2Accelerate emissionsEfficient amplificationLaser detailsOptical fibre with multilayer core/claddingPhotonic bandgapPhotonics
The invention relates to optical fibers for use in optical amplification of light, such as in optical fiber amplifiers and lasers and for use in delivery of high power light, in particular to a scheme for reducing amplified spontaneous emission at undesired wavelengths. The invention further relates to articles, methods and use. An object of the invention is achieved by a micro-structured optical fiber, which is adapted to guide light by the photonic bandgap effect and to have one or more pass bands and at least one stop-band over a wavelength range from λstop1 to λstop2. In an aspect of the invention, the at least one stop-band provides filter functions that suppress nonlinear effects. In another aspect, the core region is actively doped, and the active material has an emission spectrum with a higher value of the emission cross section σE at a wavelength λASE between λstop1 and λstop2 than outside said wavelength range such that amplified spontaneous emission and lasing within the wavelength range from λstop1 to λstop2 is reduced. In still another aspect, the optical fiber exhibits photonic bandgaps at different wavelength ranges in different radial directions of a cross section of the optical fiber.
Owner:NKT PHOTONICS
Wiredrawing automatic ending control system based on programmable logic controller and control method thereof
ActiveCN102584001AReasonable designHigh degree of automationGlass making apparatusHuman–machine interfaceProgrammable logic controller
A wiredrawing automatic ending control system based on a programmable logic controller and a control method thereof according to the invention relate to a wiredrawing automatic ending control system based on a programmable logic controller (PLC) and a man-machine interface and a control method thereof. The wiredrawing automatic ending control system is used for automatically judging defects of optical fiber during an optical fiber manufacturing process and performing automatic ending control. The wiredrawing automatic ending control system comprises an on-line optical fiber defect detecting device, automatic optical fiber cutting and coating receiving devices, a polarization film dispersion twisting automatic flicking device, a PLC and a host computer, wherein the on-line optical fiber defect detecting device comprises an optical fiber measuring probe and a signal processor; two sets of automatic optical fiber cutting and coating receiving devices are arranged and are respectively a primary automatic optical fiber cutting and coating receiving device and a secondary automatic optical fiber cutting and coating receiving device; the polarization film dispersion twisting automatic flicking device is mounted on the lower part of a secondary coating curing furnace; and the polarization film dispersion twisting automatic flicking device comprises a twisting guide wheel, a twisting motor, an automatic flicking cylinder and a horizontal holder.
Owner:四川天府江东科技有限公司
Manufacturing method of porous optical fiber preform
ActiveCN102730960AAchieve precise positioningImprove featuresGlass making apparatusUltrasound attenuationOptical fiber fabrication
The invention discloses a manufacturing method of a porous optical fiber preform, and relates to the field of new material. The method includes the steps of: preparing a mandril by using a conventional communication optical fiber preparation method, wherein the mandril contains a germanium doped quartz core layer and a pure silica quartz cladding arranged on periphery of the core layer, and the germanium doped quartz core layer and the pure silica quartz cladding are concentric circles; opening a certain number of arc slots on angles of the mandril outer edge, according to design requirements of a porous bending insensitive optical fiber, immersing the mandrel with arc slots with acid solution to remove impurities, washing by deionized water and drying; sleeving a quartz casing on the mandrel with arc slots; inserting capillaries into the arc slots to form the desired pore, thereby preparing the porous optical fiber preform. The method of the invention can realize precise positioning of micropores in the manufacturing process of porous optical fiber, improve polarization mode property and bending loss property of the porous optical fiber, reduce impurity pollution in the processing process of the porous optical fiber preform and improve attenuation property of the porous optical fiber.
Owner:WUHAN FIBERHOME RUITUO TECH CO LTD
Macrobend loss testing device for optical fiber automatic winding counting and test nethod thereof
The invention relates to the field of optical fiber manufacturing detection and discloses a macrobend loss testing device for optical fiber automatic winding counting. An optical fiber disc pay-off device, a line arrangement device and an optical fiber winding device are sequentially arranged on a rack; the line arrangement device is provided with a lead screw; a fiber guide hole is formed in thelead screw; and an optical fiber paid off by the optical fiber disc pay-off device passes through the fiber guide hole and is pulled to the optical fiber winding device; the optical fiber winding device is provided with a diameter fine adjustment unit; a motor rotating shaft drives an optical fiber winding device rotating shaft through a belt wheel; the optical fiber winding device rotating shaftdrives the lead screw of the line arrangement device to rotate through the belt wheel; and the optical fiber winding device rotating shaft drives an optical fiber winding counter rotating shaft through the belt wheel. Through the structure, after the number of turns of winding reaches the standard requirement, the shaft diameter fine adjustment device is loosened, so that the optical fiber meetingthe standard requirement is not stressed after being wound, and the accuracy of an optical fiber macrobend loss test result is improved. Meanwhile, the invention further discloses a test method of the device.
Owner:CHENGDU TAIRUI COMM EQUIP DETECTION
Optical fiber fabrication and product
ActiveUS7536877B2Little and no change in cross-section sizeLittle and no in and index profileGlass making apparatusCladded optical fibreEngineeringOptical fiber fabrication
An expeditious method for introducing geometric perturbations into lightguide during fabrication offers a perturbation stream of amplitude and periodicity—constant or varying—to satisfy a variety of needs.
Owner:FURAKAWA ELECTRIC NORTH AMERICA INC
Systems and methods for automatic and continuous coating supply during optical fiber production
InactiveUS7001466B2Increase volumePrevent air pressureOptical fibre with multilayer core/claddingPressure pumpsProcess engineeringOptical fiber fabrication
Systems and methods are disclosed for an automatic and continuous supply of coating material to a coating applicator in optical fiber fabrication. The present invention switches from one coating reservoir to another by way of a transitional period in which both coating reservoirs are supplying coating material to the coating applicator. For example, while an in-use reservoir is supplying the coating material to the coating applicator, a standby reservoir is being filled, settled to off gas air bubbles and then slowly pressurized. A sized orifice is used to slowly bleed off pressure from the in-use reservoir at a rate that does not allow the pressure in the in-use reservoir from falling out of a desired pressure range. When the in-use reservoir is substantially emptied of coating material and the pressures in both reservoirs are substantially equalized, then both reservoirs simultaneously supply coating material to the coating applicator for a period of time before switching completely over to the standby reservoir.
Owner:FURAKAWA ELECTRIC NORTH AMERICA INC
Manufacturing method of polarization maintaining optical fiber
ActiveCN104591534ASimple structureSimple processGlass making apparatusPolarization-maintaining optical fiberEngineering
The invention belongs to the technical field of optical fiber manufacturing and discloses a manufacturing method of a polarization maintaining optical fiber. The manufacturing method comprises the following steps: on the wall of a first-layer casing pipe, symmetrically cutting a gap for the center line of the cavity of the first-layer casing pipe; filling a stress rob at the gap and embedding an optical fiber preform in the first-layer casing pipe; embedding a second-layer casing pipe outside the first-layer casing pipe to form a polarization maintaining optical fiber preform; and wiredrawing the polarization maintaining optical fiber preform to form the polarization maintaining optical fiber, wherein the structure of the gap is filled by the stress rod, and in the high-temperature wiredrawing process, the round stress rod is softened to greatly fill the clearance in the gap so as to form a stress region required by the polarization maintaining optical fiber. Through the matching of the two casing pipes and the stress rod, the manufacturing method of the polarization maintaining optical fiber is simple in structure and has the advantages of greatly simplifying the processing process, reducing the manpower and equipment requirements, greatly improving the influence from the impurities to the product quality and avoiding various high-precision operation requirements in the prior art.
Owner:WUHAN BRIGHTCORE OPTICAL FIBER CO LTD
Prefabricated fiber rod with several clad layers and its fabrication
InactiveCN1398804ALow costImprove performanceGlass shaping apparatusOptical light guidesFiberMaterials science
A multiclad layer optical fiber prefabricated rod includes core rod and outer clad layer; the core rod consists of core layer, inner clad layer and low-hydroxyl high-purity clad layer in sequence, and the outer clad layer includes a high-purity outer clad layer and a subhigh-purity outer clad layer. The fabrication process includes the successive steps of: making the core rod; the outside-pipe deposition of making high-purity outer clad layer on the surface of the core rod by using 99.99-99.999 % purity SiCl4 material to produce the prefabricated rod; and further making high-purity outer clad layer on the outer surface of the prefabricatd rod with 99-99.99% purity SiCl4 material by the same technological process. The present invention has low material cost, improved fiber performance, raised core rod making efficiency and capacity.
Owner:YANGTZE OPTICAL FIBRE & CABLE CO LTD
Indirect heat type double-clad crystal fiber fabrication method
A double-clad optical fiber fabrication method including the steps of: preparing a crystal fiber, inserting the crystal fiber into a silica capillary, attaching a sapphire tube to the periphery of the silica capillary, and applying a laser beam to the sapphire tube to increase the temperature of the sapphire tube and to further fuse the silica capillary with thermal radiation to have the fused silica capillary be wrapped about the crystal fiber, thereby forming the desired double-clad optical fiber.
Owner:NAT SUN YAT SEN UNIV
Conditioned launch of a single mode light source into a multimode optical fiber
InactiveUS20160124149A1High bandwidthConvenient lengthLaser detailsCoupling light guidesFiberTransceiver
An optical coupling system and method are provided for coupling light from a single mode laser (SML) light source into an MMF that reduce back reflection of laser light into the SML light source and provide controlled launch conditions that allow the light to avoid defective areas in the MMF as the light travels in the MMF. The launch conditions are controlled to cause preselected spatial intensity distribution patterns to be launched into the MMF that result in the laser light avoiding defective areas in the MMF as the laser light passes through the MMF. The combination of all of these features allows greater link bandwidth and link length to be achieved with an MMF without increasing transceiver packaging complexity. In addition, because the preselected spatial intensity distributions allow the light to avoid particular areas in the fiber that are likely to contain defects, fiber manufacturers can focus less on reducing defects in those areas and focus more on optimization of performance parameters.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Induction furnace water temperature constant automatic control system and method
ActiveCN104503509ARealize the purpose of constant automatic control of water temperatureReduce control lagTemperatue controlTemperature controlAutomatic control
The invention discloses an induction furnace water temperature constant automatic control system comprising an induction furnace body which has a hollow cylindrical structure comprising an internal cylinder and an external cylinder. A bar-delivering device is fixed at the side surface of the external cylinder. A clamping disc is fixedly installed on the bar-delivering device. The clamping disc is arranged exactly above the induction furnace body. The side surface of the top part of the external cylinder is communicated with a water inlet pipe and a water outlet pipe. The water inlet pipe and the water outlet pipe are respectively provided with a valve A and a valve B. The system also comprises a heater, a temperature sensor, a liquid flow meter and a photosensitive sensor. Besides, the valve A and the valve B are connected with a PLC controller. The invention also discloses a control method of the induction furnace water temperature constant automatic control system. With combined action of the heater, a temperature controller, the PCL controller, the temperature sensor, the liquid flow meter and the pipeline transmitting valves, the objective of induction furnace water temperature constant automatic control is realized so that the structure is simple, the technology is table, lagging is reduced and the effect is obvious, and thus the induction furnace water temperature constant automatic control system is beneficial for wide-range popularization and use in the optical fiber manufacturing industry.
Owner:ZHONGTIAN TECH FIBER OPTICS +1
Optical fiber fabrication
ActiveUS7813608B2Quality improvementMinimize size variationLaser detailsCoupling light guidesEngineeringOptical fiber fabrication
Owner:LIEKKI OY
Optical fiber manufacturing method, optical fiber and endoscope
Provided is a method for manufacturing an optical fiber that is inserted into an insertion portion of an endoscope and guides light, wherein inside an upright fiber drawing furnace, inside a hollow clad tube including a clad glass having a viscosity η1 of 5.0<Log η1<7.0 at a temperature at which a viscosity η2 of a core glass becomes Log η2=3.5, the core glass in a fluidized state runs down by gravity, whereby the core glass and the clad glass are integrated.
Owner:OLYMPUS CORP
Wire penetrating system and method for optical fiber drawing
The invention creatively provides a wire penetrating system and method for optical fiber drawing. The wire penetrating system comprises a prefabricated rod, a drawing tower body, a heating furnace, acooling pipe, a coating device, a curing lamp box, a measuring device, a traction mechanism and a main controller; the prefabricated rod is fixed at the top end of the drawing tower body and is coaxial with an inlet of the heating furnace; the heating furnace is arranged at the upper part of the wire drawing tower body; and a cooling pipe is arranged below the heating furnace and is used for cooling bare optical fibers. According to the invention, an original wire penetrating method is changed, and after optical fiber drawing is interrupted, original mold unloading and cleaning operation is not carried out, so that waste of a large amount of manpower, material resources and labor hours for cleaning a mold is avoided, meanwhile, various problems of an optical fiber coating layer in an optical fiber production speed-increasing process are reduced, cost is reduced for enterprises, and certain contributions are made to improving the product percent of pass.
Owner:TIANJIN CHANGFEI XINMAO OPTICAL COMM CO LTD
Method for detecting work efficiency of PMD rubbing and twisting device for optical fibers
ActiveCN104062136AEffective regulationGuaranteed stabilityTesting optical propertiesEngineeringOptical fiber fabrication
The invention relates to a method for detecting work efficiency of a PMD rubbing and twisting device for optical fibers, and belongs to the technical field of optical fiber manufacturing. The method is a test for carrying out optical fiber actual twisting manually, optical fiber twisting samples with a length of 2 m are taken, two testing methods are adopted to test the directions and the times of twisting of the optical fiber twisting samples, a sine period curve chart is generated according to testing data, and then the oscillation amplitude and the frequency of a PMD rubbing and twisting wheel are adjusted according to the sine period curve chart. According to the method for detecting the work efficiency of the PMD rubbing and twisting device for the optical fibers, the operation effects of the PMD rubbing and twisting device can be detected macroscopically, PMD rubbing and twisting parameters can be adjusted effectively in time, and therefore monitoring on the operation effects of a high-speed rolling wheel clamping type optical fiber PMD rubbing and twisting device is achieved. The problem that waste products appear frequently in production due to insufficient monitoring is solved, and the gap that operation situations of the high-speed rolling wheel clamping type optical fiber PMD rubbing and twisting device cannot be monitored in a current optical fiber high-speed wire drawing technology is filled in.
Owner:湖北凯乐量子通信光电科技有限公司
Vacuum wiredrawing furnace for optical fiber manufacturing
PendingCN111186999AGuaranteed stabilityImprove uniformityGlass making apparatusPhotonic crystalGraphite
The invention provides a vacuum wiredrawing furnace for optical fiber manufacturing. The vacuum wiredrawing furnace comprises an optical fiber preform, a wiredrawing furnace chamber outer cover, a wiredrawing furnace body, a second vacuum area outer cover, a core heating area outer cover, a heating coil and a graphite part, wherein a first vacuum area is defined by the wiredrawing furnace chamberouter cover, the second vacuum area outer cover and the wiredrawing furnace body; a second vacuum area is defined between the second vacuum area outer cover and the wiredrawing furnace body; a core heating area is defined between the core heating area outer cover and the wiredrawing furnace body; the optical fiber preform sequentially penetrates through the wiredrawing furnace chamber outer cover,the second vacuum area and the wiredrawing furnace body and extends into the bottom of the core heating area in the wiredrawing furnace; the graphite part is arranged at the bottom of the core heating area, and a circle of the heating coil is arranged on the upper side of the graphite part in the circumferential direction of the optical fiber preform. According to the vacuum wiredrawing furnace,the structural design is more optimized, impurity pollution is avoided, the cost is lower and the consistency of optical fiber parameters is better when common optical fibers are drawn, and the capability of drawing photonic crystal optical fibers with a complex structure is achieved.
Owner:TONGDING INTERCONNECTION INFORMATION CO LTD
Apparatus and method for chemical deposition on a rod member in an optical fibre manufacturing process
An apparatus and method for chemical deposition on a rod member having a support structure for supporting the rod member substantially coaxial to a deposition axis; a burner for depositing chemical substances on the rod member; and a rotation device for imparting a rotation motion to the rod member. The rotation device has a joint member of a type suitable to transmit torque between two misaligned members, for example, a double universal joint or a flexible joint, positioned between a motor and a rod gripping member.
Owner:PRYSMIAN CAVI E SISTEMI ENERGIA
Predicting optical fiber manufacturing performance using neural network
A machine accesses a stored dataset comprising, for each of multiple optical fiber preforms, a plurality of images of each optical fiber preform coupled with an indication of a number of fiber kilometers lost due to diameter upset of a cable built using optical fiber drawn from the optical fiber preform. Each image represents a portion of the optical fiber preform. The machine preprocesses the stored dataset to generate a training dataset. The machine trains, using the training dataset, a convolutional neural network (CNN) to predict diameter upset performance of an optical fiber preform based on visual information representing the optical fiber preform. The CNN comprises an input layer, a plurality of hidden layers, and an output layer. Each of the input layer and the plurality of hidden layers comprises a plurality of artificial neurons. The machine provides an output representing the trained CNN.
Owner:CORNING INC
Preparation method of taper-core optical fiber with gradually-changed core-to-package ratio and taper-core optical fiber
ActiveCN113277727ABalance heat productionPromote absorptionGlass optical fibreGlass making apparatusRare earth ionsGlass particle
The invention belongs to the technical field of optical fiber manufacturing, and particularly discloses a preparation method of a taper-core optical fiber with a gradually-changed core-to-package ratio and the taper-core optical fiber. The method comprises the following steps: depositing a glass particle loose layer on the inner wall of a reaction tube; performing rare earth ion doping on the glass particle loose layer; drying the reaction tube, conducting sintering at high temperature, so as to vitrify the glass particle loose layer, conducting fusing to form a solid preform core rod, and then polishing the solid preform core rod to obtain a conical core rod with a specified taper angle; and conducting processing to obtain a cylindrical glass rod which is provided with a conical hollow hole, combining the glass rod with the conical hollow hole with a conical core rod to obtain a conical core active optical fiber preform, and putting the conical core active optical fiber preform into a wire drawing tower for drawing to obtain the conical core optical fiber with a gradually changed core-to-cladding ratio. The taper core optical fiber is prepared by the method. The core-to-package ratio of the prepared taper core optical fiber with the gradually-changed core-to-package ratio is gradually changed along with the length of the optical fiber, pump light absorption of the optical fiber can be improved, optical fiber heat production can be balanced, and laser output power can be improved.
Owner:武汉光谷航天三江激光产业技术研究院有限公司
Conditioned launch of a single mode light source into a multimode optical fiber
The invention provides a conditioned launch of a single mode light source into a multimode optical fiber. An optical coupling system and method are provided for coupling light from a single mode laser (SML) light source into an MMF that reduce back reflection of laser light into the SML light source and provide controlled launch conditions that allow the light to avoid defective areas in the MMF as the light travels in the MMF. The launch conditions are controlled to cause preselected spatial intensity distribution patterns to be launched into the MMF that result in the laser light avoiding defective areas in the MMF as the laser light passes through the MMF. The combination of all of these features allows greater link bandwidth and link length to be achieved with an MMF without increasing transceiver packaging complexity. In addition, because the preselected spatial intensity distributions allow the light to avoid particular areas in the fiber that are likely to contain defects, fiber manufacturers can focus less on reducing defects in those areas and focus more on optimization of performance parameters.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
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