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48results about How to "Low polarization dependent loss" patented technology
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Wavelength selective switch with reduced chromatic dispersion and polarization-dependent loss
InactiveUS20090220192A1Low dispersionIncrease fiber port capacityCoupling light guidesFiberLength wave
A reduced polarization-dependent loss optical device utilizing two or more dispersive elements or a single dispersive element and a turning mirror, wherein the optical signal makes two passes through said single dispersive element when reflected from said turning mirror, and wherein the two or more dispersive elements or double pass single dispersive element has lower dispersion compared to a functionally equivalent single dispersive element, resulting in lower polarization dependent loss, reduced chromatic dispersion and increased wavelength dispersion. Moreover, a wavelength selective switch incorporating the optical device utilizing aperture-shared optics and functionally distinct planes of operation that enables high fiber port counts, such as 1×41, and multiplicative expansion, such as to 1×83 or 1×145, by utilizing elements optimized for performance in one of the functionally distinct planes of operation without affecting the other plane.
Owner:OLYMPUS CORP
Manufacturing process for optical fiber coupler
InactiveCN102520485AReduce sensitivityStable temperature characteristicsCoupling light guidesPolarization-maintaining optical fiberOptical fiber coupler
The invention discloses a manufacturing process for an optical fiber coupler, which includes: firstly, respectively grinding two optical fibers; secondly, combining two grinded surfaces; fusing the grinded surfaces by a high-temperature heating source; and finally, precisely controlling the splitting ratio of the coupler by the process of continuous fusing or biconical taper. The manufacturing process can be used for manufacturing a high-performance polarization maintaining optical fiber coupler, a single-mode optical fiber coupler, a multi-mode optical fiber coupler and a multi-mode coupler with a splitting ratio unrelated to an input wavelength and an activation pattern, the polarization maintaining optical fiber coupler and the single-mode optical fiber coupler manufactured by the manufacturing process have the advantages of short coupled area, high reliability, fine temperature property, polarization independence, wavelength independence and the like, and the multi-mode optical fiber coupler manufactured by the manufacturing process has quite high reliability besides quite low added loss.
Owner:COMCORE OPTICAL TECH
Transmission type diffraction grating
InactiveUS20050200957A1High diffraction efficiencyLow polarization dependent lossSpectrum investigationDiffraction gratingsWave shapeLength wave
A transmission grating that provides low polarization dependent loss over a wide wave range and provides high diffraction efficiency even with a small groove pitch and high resolving power and dispersion. In a transmission grating 10, multiple parallel ridges 22 that are transparent for the wave range to be used are disposed on one side of a substrate 20 that is transparent for the wave range to be used. Parallel grooves 24 are formed at a fixed pitch a between these ridges. Light is applied from the surface of the transmission grating on which the grooves are formed and diffracted light is extracted from the substrate surface on which grooves are not formed. The groove pitch a is set to a range of 0.51 λc-1.48 λc, where λc is the central wavelength.
Owner:NIPPON SHEET GLASS CO LTD
Method for manufacturing polarization-independent grating coupler
InactiveCN101833138AImprove coupling efficiencyLow polarization dependent lossDiffraction gratingsCoupling light guidesHigh bandwidthBroadband
The invention provides a method for designing a T-shaped groove grating structure. An output coupler is realized by adopting different coupling principles for two modes so as to realize efficient coupling output by adopting the same structure for a TE mode and a TM mode simultaneously. The coupling efficiencies of the TE mode and the TM mode within a wavelength range of 1,480 to 1,580nm are both above 50 percent; and the coupling efficiencies of the two modes reach 58 percent when the wavelength is 1,550nm. The polarization dependent loss (PDL) of the coupler within a wavelength range of 1,510 to 1,580nm is less than 0.05dB and the PDL of the coupler is only 3.6*10<-3>dB when the wavelength is 1,550nm. The designed grating coupler realizes a coupling output function with high coupling efficiency, low polarization dependent loss and high bandwidth, has the advantages of simple structure, convenient manufacturing and small volume, is compatible with a standard CMOS process, and can provide technical support for the design and manufacturing of a polarization-independent device.
Owner:HUAZHONG UNIV OF SCI & TECH
A terahertz photonic crystal fiber coupler
InactiveCN102289032AConsistent output energyLow polarization dependent lossOptical fibre with multilayer core/claddingWavelength rangeEngineering
The invention discloses a terahertz photonic crystal fiber coupler. Including cladding and core, the core is three, surrounded by the inner air hole (3) at the apex of the regular hexagon, wherein the first core (4) is formed by the center of the matrix material (1) , the second core (5) and the third core (6) are symmetrically located on both sides of the first core (4); the network of outer air holes (2) is located around the inner air holes, and the adjacent holes are equally spaced; the first fiber core (4) is the input end, the second fiber core (5) and the third fiber core (6) are the output ends; the inner air hole (3) Same as the hole period Λ of the outer layer air holes (2), the relationship between the diameter d1 of the outer layer air holes (2) and the diameter d2 of the inner layer air holes (3) satisfies d1≥d2. The invention has the advantages of working in a wide wavelength range, stable output, low transmission loss and polarization-dependent loss, and the like.
Owner:JIANGSU UNIV
Array waveguide grating structure based on PLC (programmable logic controller) technique and manufacturing method thereof
InactiveCN102736177AReduce stress effectsLow polarization dependent lossOptical light guidesGratingProgrammable logic controller
The invention discloses an array waveguide grating structure based on a PLC (programmable logic controller) technique and a manufacturing method thereof. The manufacturing method comprises the following steps of: selecting a substrate, depositing and growing a B and P doped silica layer as a lower coating layer on the selected substrate by adopting a PECVD (plasma enhanced chemical vapor deposition) process; growing a waveguide core layer on the lower coating layer; preserving a waveguide core in a preset shape on the waveguide core layer, and corroding to remove the part except the waveguide core in the preset shape and to remain the waveguide core in the preset shape; and growing a B and P highly doped silica layer capable of completely covering the lower coating layer and the waveguide core as an upper coating layer on the lower coating layer and the waveguide core, so that the needed array waveguide grating structure based on the PLC technique is manufactured. By using the array waveguide grating structure based on the PLC technique and the manufacturing method thereof, which are provided by the invention, the defects of long growth period, high cost, bad product performance and the like in the prior art can be overcome, so as to realize the advantages of short growth period, low cost and good product performance.
Owner:无锡思力康光子科技有限公司
Low polarization dependent loss lithium niobate straight-bar waveguide phase modulator and manufacturing method thereof
ActiveCN103676219ALow polarization dependent lossSmall differenceNon-linear opticsSurface layerCoupling
Owner:BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
Full optical fiber integrated optical power monitor and manufacturing method thereof
InactiveCN101435899AReduce processing costsLow costCoupling light guidesElectromagnetic transmissionOptical powerPhysics
The invention discloses a full optical fiber integrated optical power monitor and a manufacture method thereof. The full optical fiber integrated optical power monitor comprises an optical power monitor and a variable optical attenuator; a cladding of a section of optical fiber is provided with a first light splitting notch and a second light splitting notch between which the distance is 5-25mm; the first light splitting notch is a leakage light path of the variable optical attenuator; and the second light splitting notch is a leakage light path of the optical power monitor. The full optical fiber integrated optical power monitor is manufactured by a side polishing method, the processing cost is low, and the full optical fiber integrated optical power monitor is taken as an integrated substrate, so that the cost of an integrated device is greatly reduced. The full optical fiber integrated optical power monitor has the advantage of capability of being controlled electrically, saves an optical fiber core cutting and mechanical driving mechanism of a mechanical optical power monitor, has low inserting loss and small back reflection electrode, improves reliability of the device and reduces the packaging volume of the device.
Owner:JINAN UNIVERSITY
Method for producing high power varying optical attenuator
ActiveCN101446667ASimple methodSimple processCoupling light guidesUltrasound attenuationOptical power
The invention belongs to the optical passive device technical field, relating to a method for producing a high power variable optical attenuator. A metallic thin film loophole is produced on a glass substrate and the fenestration varies gradually along the length of the substrate, thus the attenuation of optical power varies gradually along the length of the substrate. The metallic thin film loophole is produced by stripping the metals. In the invention, the metallic thin film loophole does not need to be produced by wet or dry etching technique, the production technique is simple, and the reproducibility is good; the metallic thin film of the surface can be any one layer or a plurality of layers of metallic materials, thus the thin film is not limited by the wet or dry etching technique on materials; and the edge of the metallic little hole of the finished attenuator is smooth, and the rate of finished products of the device is high.
Owner:GUANGXUN SCI & TECH WUHAN
Thermal compensation optical wave multiplexing and demultiplexing chip and preparation method thereof
ActiveCN109387902ATransmission loss will not increaseNo fragmentation requiredOptical waveguide light guideGratingRefractive index
The invention relates to the technical field of optical wavelength division multiplexing, and in particular relates to a thermal compensation optical wave multiplexing and demultiplexing chip and a preparation method thereof. The thermal compensation optical wave multiplexing and demultiplexing chip provided by the invention comprises an input array waveguide, an input star coupler, an array waveguide, an output star coupler and an output array waveguide; a thermal compensation structure is arranged on the input star coupler, and a trench grating is processed through a semiconductor process; and negative thermal expansion coefficient silica gel is filled in the trench grating. According to the thermal compensation optical wave multiplexing and demultiplexing chip and the preparation methodthereof, the grating structure is etched on the input star coupler and is filled with a negative refractive index material to achieve temperature drift compensation; and the chip is free of stress control and fragmentation, and has the advantages of easy integration manufacture, compact structure, low transmission loss, uniform insertion loss, low polarization-dependent loss and the like.
Owner:苏州亿波达光电子科技有限公司
Single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter
ActiveCN110058362ALow polarization dependent lossFunction increaseCoupling light guidesOptical pathFiber-optic communication
The invention discloses a single-fiber bidirectional receiving and sending device based on pentagonal prism and interference filter, belonging to the technical field of optical fiber communication. The single-fiber bidirectional receiving and sending device comprises a laser transmitter, a laser detector, an optical fiber component and the pentagonal prism, wherein the pentagonal prism comprises afirst side face, a second side face and a third side face arranged corresponding to each part above, and a fourth side face used for performing total reflection for a light beam, wherein the first side face is provided with the filter. In the device provided by the invention, the pentagonal prism is added in an optical path, thus, optical path of incident light is changed before entering into thefilter, an incident angle (5-30 degrees) of the incident light is changed, and polarization dependent loss of a system is reduced; meanwhile, an included angle Beta between the first side face I andthe fourth side face IV is designed suitably, thus, the second beam of output light is perpendicular to the incident light, which meets a standard of an optical transceiver. The device provided by theinvention enables each index of such structure product to meet requirements under the premise of guaranteeing size, and improves functions of the transceiver.
Owner:CHINA JILIANG UNIV +1
Wavelength-selective optical switch
ActiveCN107870397ALow polarization dependent lossReduce complexityCoupling light guidesWavelength selectivityOptical switch
The invention provides a wavelength-selective optical switch, which comprises a polarization beam-splitting unit and a wavelength selection unit. The wavelength selection unit includes a polarizationbeam splitting unit used for splitting an input light beam into a first polarized light beam and a second polarized light beam, transmitting the first polarized light beam to the input end of a firstgroup of micro-ring resonators and transmitting the second polarized light beam to the input end of a second group of micro-ring resonators. The first group of micro-ring resonators is used for coupling a first target beam in the first polarized light beam to the first group of micro-ring resonators, and outputting the first target beam output to a polarization beam-combining unit. The second group of micro-ring resonators is used for coupling a second target beam in the second polarized light beam to the second group of micro-ring resonators, and outputting the second target beam output to the polarization beam-combining unit. The polarization beam-combining unit is used for combining the first target beam and the second target beam. In this way, the polarization state conversion of the first polarized light beam and the polarization state conversion of the second polarized light beam are the same in number of times. The polarization-related loss is lowered.
Owner:HUAWEI TECH CO LTD
Plant waveguide and optical fibre low-loss connecting method
InactiveCN1212529CReduce coupling lossLow Polarization Dependent LossCoupling light guidesOptical waveguide light guideCoupling lossButt joint
Owner:ZHEJIANG UNIV
Manufacturing method of polarization-independent optical isolator, bonding technology and solution of optical components
ActiveCN102707461BReduce manufacturing costIncrease productivityNon-linear opticsWedge angleHydrogen
Owner:CASIX
Photonic crystal fiber directional coupler
InactiveCN103091771AStructural parameter optimizationSimple structureCladded optical fibreCoupling light guidesHost materialEngineering
The invention discloses a photonic crystal fiber directional coupler. Host material (1), holes (2) and holes (3) form fiber cores and a cladding, wherein the holes (2) and the holes (3) are formed in the host material (1). Centers of the holes (2) and the holes (3) are respectively located on nodes of a right triangle structured grid. The number of the fiber cores is three, where the first fiber core (4) is arranged on a center area of the host material (1), the right triangle structured grid misses a hole to from the first fiber core (4), the second fiber core (5) and the third fiber core (6) are symmetrically located on two sides of the first fiber core (4), the right triangle structured grid respectively misses a hole to from the fiber core (5) and the fiber core (6), air holes around innermost layers of the fiber core (5) and the fiber core (6) are the holes (2) and the holes (3), and the relationship of the diameter d2 of the holes (3) and the diameter d1 of the holes (2) satisfies that d2 >=d1. According to the photonic crystal fiber directional coupler, the diameters of the cladding air holes (3) of the fiber cores (the fiber core (5) and the fiber core (6)) on two sides are changed, and the advantages of being wide in wavelength coverage operation, insensitive to the fiber length and low in transmission loss and polarization relevant loss and other advantages are achieved.
Owner:JIANGSU UNIV
Optical branching unit, and method of manufacturing the same
InactiveUS20070086711A1Improve uniformityLow polarization dependent lossRadiation pyrometryMaterial analysis by optical meansOptoelectronicsOptical branch
An optical branching unit according to the invention, has on a substrate, a light input part which inputs light, an optical branch which branches the light input to the light input part at a predetermined ratio, a light output part which guides the light branched by the optical branch to a predetermined position, and a dummy pattern which is provided on a substrate independently of an area provided with the light input part, optical branch and light output part, made of the same material as the light input part, optical branch and light output part, and defined to have an area, so that an occupation rate, or a ratio of the dummy pattern to the area of a substrate except the light input part, optical branch and light output part, is 70% or higher.
Owner:ORMON CORP
Polarization-independent electro-optical modulator based on two-dimensional grating coupling
InactiveCN112946930AReduce packaging costsImprove coupling efficiencyOptical waveguide light guideNon-linear opticsConvertersGrating
The invention provides a polarization-independent electro-optical modulator based on two-dimensional grating coupling. The polarization-independent electro-optical modulator sequentially comprises: a substrate, a lower cladding, a silicon device layer and an upper cladding from bottom to top, eight spot size converters, four silicon-based optical waveguides, two four-channel input\output two-dimensional grating couplers, two silicon-based PN junction optical waveguide phase shifters and a GSG single-drive coplanar waveguide traveling wave electrode which are formed on the silicon device layer in an etching mode, wherein the silicon-based PN junction optical waveguide phase shifters are of waveguide structures made of silicon materials. The middle section of the at least two silicon-based optical waveguides is replaced by a waveguide structure, and the GSG single-drive coplanar waveguide traveling wave electrode is arranged above the silicon-based PN junction optical waveguide phase shifter and is in contact with a flat plate area of the silicon-based PN junction optical waveguide phase shifter. Light beam splitting and light beam combination of four channels can be achieved, conversion from light phase modulation to light intensity modulation can be achieved, in addition, the optical fiber and the grating coupler are vertically coupled, and the advantages of being high in coupling efficiency, low in polarization dependent loss and high in alignment tolerance capacity are achieved.
Owner:苏州微光电子融合技术研究院有限公司
Tunable filter using a wave plate
InactiveUS20130094087A1Low polarization dependent lossEliminate polarization splitting and recombining elementsOptical elementsBandpass filteringTransmittance
Tunable filters are provided that have transmittances that are independent of the polarization state of an incident beam. The tunable filters include an interference bandpass filter positioned to transmit an input beam of light to produce transmitted light. A wave plate is positioned to rotate the polarization of the transmitted light and a reflector is positioned to reflect the rotated light so that it propagates through the wave plate a second time and then passes through the interference filter a second time to produce second transmitted light.
Owner:OPTOPLEX CORP
Method for making long period optical fibre grating
Owner:DALIAN UNIV OF TECH
Wafer of planar optical waveguide splitter
InactiveCN102360097ALow polarization dependent lossQuality improvementOptical light guidesSilicon oxideSilicon dioxide
The invention provides a wafer of a planar optical waveguide splitter. Trapezoidal planar optical waveguide splitter chips are adopted, which are arranged on the wafer in the manner of inversed pairs in succession. By utilizing the wafer of the planar optical waveguide splitter provided by the invention, the nonuniformity of a process caused by the structure is improved, thus the stress is greatly reduced, and the quality of a device is improved; more chip units are arranged on the wafers with the same sizes; and the utilization rate of the wafers is higher, as a larger number of channels are provided, thus improving the chip production value of a single wafer, and lowering the production cost; and in addition, silicon oxide is adopted as a substrate, thus omitting the step that a lower clapping layer of the silicon oxide grows on a silicon substrate in the traditional semiconductor process, shortening the growth cycle of the product, and lowering the production cost; and the substrate and the lower clapping layer are made of the same material, thus eliminating the stress influence of the substrate on the device, and lowering the polarization dependent loss of the device.
Owner:宋齐望 +1
Adjustable optical attenuator and making method thereof
InactiveCN102385175ALow polarization dependent lossShortened growth timeOptical waveguide light guideNon-linear opticsEngineeringOptical attenuator
The invention relates to an adjustable optical attenuator and a making method thereof, and belongs to the field of optical communication. The adjustable optical attenuator comprises a silicon dioxide substrate and an external silicon dioxide upper coating arranged on the silicon dioxide substrate; a groove is formed in the external silicon dioxide upper coating, a side trench is formed between the external silicon dioxide upper coating and the groove, and a thermo-luminescent material is filled in the side trench; a sealing cap is covered on the external silicon dioxide upper coating, the side trench and the groove; a waveguide core is arranged at the bottom of the groove, and the upper part of the waveguide core is provided with an internal silicon dioxide upper coating; and a metal electrode is arranged at the joint of the inner part of the sealing cap and the internal silicon dioxide upper coating. By directly growing the waveguide core on the silicon dioxide substrate, the growth time of a silicon dioxide lower coating is reduced, the growth period of a product is shortened, and the cost of the product is reduced; and in addition, because the substrate and the lower coating are made of the same material, the stress influence of the substrate on the device is eliminated, and the polarization related loss of the device is effectively reduced.
Owner:孙其琴
Optical branching unit, and method of manufacturing the same
InactiveUS7335875B2Improve uniformityLow polarization dependent lossRadiation pyrometryMaterial analysis by optical meansOptoelectronicsPhysics
Owner:ORMON CORP
Optical-phase conjugation mirror device
PendingCN108628013ACompact structureSimple structureCladded optical fibreOptical waveguide light guideOptical phase conjugationLight beam
The invention discloses an optical-phase conjugation mirror device. The device comprises optical fibers, a polarization spectrometer, a lens, a Faraday rotator and a reflecting mirror; Gaussian divergent light beams emitted from the optical fibers pass through the polarization spectrometer, the lens, the Faraday rotator and the reflecting mirror in sequence, are reflected by the reflecting mirror,then pass through the Faraday rotator, the lens and the polarization spectrometer and are returned to the optical fibers; two light beams divided by the polarization spectrometer deflect and convergethrough the lens, are reflected by the reflecting mirror and then transmitted in the reverse direction of the path of the opposite side, pass through the Faraday rotator again and enter the polarization spectrometer in the reverse direction, and the two light beams are recombined in space and enter the optical fibers. According to the optical-phase conjugation mirror device, nonreciprocal 90-degree angle polarization rotation which is irrelevant to the wavelength and temperature is achieved, the structure is compact, simple and reliable, and meanwhile the optical performance of high extinction ratio, low polarization related loss and low insertion loss is also kept.
Owner:吕婧菲
Spot-size converter and silicon optical integrated chip
ActiveCN113359234AImprove pattern matchingLow polarization dependent lossOptical waveguide light guideTransmission lossOptical polarization
The invention discloses a spot-size converter and a silicon optical integrated chip. The spot-size converter has a first end surface optically coupled with an external optical fiber and a second end surface optically coupled with an external optical device, and the spot-size converter comprises a first optical waveguide and a second optical waveguide, wherein the first optical waveguide comprises a first wedge-shaped structure and a second wedge-shaped structure, and the first wedge-shaped structure and the second wedge-shaped structure face opposite directions; and the second optical waveguide comprises a third wedge-shaped structure, and the tip of the third wedge-shaped structure faces the first wedge-shaped structure and is at least partially overlapped with the second wedge-shaped structure. By designing a special waveguide coupling structure, the mode matching degree of the spot-size converter and the external optical fiber is improved, the polarization dependent loss between the two optical waveguides in the spot-size converter is reduced, and the thermal stability of the optical waveguides in the silicon optical integrated chip is improved, so that the optical transmission loss in the silicon optical integrated chip is reduced.
Owner:INNOLIGHT TECHNOLOGY (SUZHOU) LTD
Miniature magneto-optical fiber switch
PendingCN110456531AHigh channel switching repeatabilityRealize switchingNon-linear opticsFiberPower flow
The invention discloses a miniature magneto-optical fiber switch, consisting of a miniature three-fiber collimator, a miniature current coil and a miniature space light processing optical kernel. Theminiature fiber switch with a 1*2 structure and a 2*1 structure is realized by controlling the current direction of the current coil, and the input and output fibers of the miniature magneto-optical fiber switch are located on the same side. The scheme of the invention adopts the three-fiber collimator and the miniature space light processing optical kernel, realizes the micro-structured magneto-optical fiber switch which can simultaneously implement various switching working modes, and has the advantages of multiple working modes, simple structure, ultra-small size, low insertion loss, low polarization-dependent loss, single-sided fiber output, ultra-high channel switching repeatability and ultra-high lifetime.
Owner:ZHEJIANG UNIV
Dual-coupling structure-based single-mode core-dislocated fiber temperature measurement method
InactiveCN105092086AAvoid modal dispersionAvoid pattern noiseThermometers using physical/chemical changesCouplingImage resolution
The invention discloses a dual-coupling structure-based single-mode core-dislocated fiber temperature measurement method. Based on a core-dislocated fiber structure, interferential optical signals pass through a coupler to generate the laser light of a particular wavelength. After that, the wavelengths of the laser light outputted at different temperatures correspondingly are analyzed, and then the performance of a temperature sensing system is studied. The dual-coupling structure is high in resolution rate, stable in performance and high in sensitivity.
Owner:HENAN NORMAL UNIV
Super-miniature optical circulator
The invention provides a super-miniature optical circulator. The super-miniature optical circulator comprises a first collimator, a first polarization splitting prism, a first wave plate, a first magneto-optic crystal and a second polarization splitting prism. A light beam from a first optical fiber is coupled into a second optical fiber, and a light beam from the second optical fiber is coupled into a third optical fiber. The first optical fiber, the second optical fiber and the third optical fiber are merged into the three-fiber collimator, and fibers are emitted from the single side of theoptical circulator.
Owner:桂林光隆光学科技有限公司
Active polarization rotator realized based on mixed surface plasma groove waveguide
The invention discloses an active polarization rotator realized based on a mixed surface plasma groove waveguide. The active polarization rotator comprises a power beam splitter, an MZI phase modulation unit, a polarization rotation control unit and a beam combiner. The polarization rotation control unit comprises a mixed surface plasma groove waveguide. The mixed surface plasma groove waveguide has a certain groove width, two dielectric waveguides of the mixed surface plasma groove waveguide have a certain width, and two sides of the mixed surface plasma groove waveguide are respectively provided with a material which has a certain thickness, length and width and has metal characteristics at a certain interval. The active polarization rotator has the advantages that the structure is simplified, the polarization conversion loss is small, and the active regulation and control of the polarization state of the output light can be realized for the incident light of two different polarization states.
Owner:北京爱杰光电科技有限公司 +1
Full optical fiber integrated optical power monitor and manufacturing method thereof
InactiveCN101435899BImprove reliabilityLow insertion lossCoupling light guidesElectromagnetic transmissionOptical powerOptical attenuator
Owner:JINAN UNIVERSITY
Manufacture of erbium dosed phosphate two step ion exchange optical waveguide
InactiveCN1252500CGood symmetry of refractive index distributionImprove stabilityOptical waveguide light guidePotassium nitratePhosphate
Owner:SHANGHAI JIAO TONG UNIV
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