WO2021047159A1 - Multiplexeur par répartition en longueur d'onde optique - Google Patents

Multiplexeur par répartition en longueur d'onde optique Download PDF

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Publication number
WO2021047159A1
WO2021047159A1 PCT/CN2020/079756 CN2020079756W WO2021047159A1 WO 2021047159 A1 WO2021047159 A1 WO 2021047159A1 CN 2020079756 W CN2020079756 W CN 2020079756W WO 2021047159 A1 WO2021047159 A1 WO 2021047159A1
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WIPO (PCT)
Prior art keywords
polarization beam
combining structure
wave plate
polarization
beam combining
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PCT/CN2020/079756
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English (en)
Chinese (zh)
Inventor
冯振阳
洪小刚
阚敏
王洁
朱宇
陈奔
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亨通洛克利科技有限公司
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Publication of WO2021047159A1 publication Critical patent/WO2021047159A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2773—Polarisation splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM

Definitions

  • the invention relates to the technical field of optical division multiplexers, in particular to an optical wavelength division multiplexer.
  • Optical division multiplexers are used in optical fiber communication systems with multiple wavelengths, low channel crosstalk, and directional transmission. It is specifically used in optical communication devices, such as 100G CWDM, 400G CWDM ⁇ DWDM ⁇ LAN-WDM and other high-speed optical modules.
  • the wavelength division multiplexing in the optical module mainly includes the following two structural solutions:
  • the Zigzag MUX solution as shown in Figure 1, combines multiple thin-film filters on the side of the glass block, and uses the thin-film filters to have different transmittance and reflectivity for different wavelengths, and realizes the combination of 4 different wavelengths at the common port.
  • the Zigzag preparation process is relatively mature, the processing of dielectric films is complicated. This solution is suitable for fewer wavenumbers, reversible optical paths, different optical paths of each optical channel, and large output optical power differences.
  • Arrayed waveguide grating AWG scheme as shown in Figure 2.
  • Optical signals of different wavelengths are incident through the input waveguide, then enter the arrayed waveguide 2'through the input star coupler 1', and finally the optical signal is synthesized by the output star coupler 3'.
  • the light wave is output through the output waveguide.
  • the arrayed waveguide PLC is simple to manufacture and can realize multi-wavelength transmission, the AWG optical power loss is large, the crosstalk between each channel has a large signal-to-noise isolation, and the temperature is sensitive.
  • the present invention provides an optical wavelength division multiplexer, which reduces crosstalk signal and noise between channels, has good isolation, has low temperature and wavelength-dependent insertion loss, low manufacturing cost, and is integrated into a multi-transmission system.
  • Wavelength single-channel optical path realizes the stability and reliability of long-distance transmission of optical signals.
  • An optical wavelength division multiplexer which is characterized in that it comprises a first polarization beam combining structure, a second polarization beam combining structure, a third polarization beam combining structure, and a polarizer.
  • the polarization beam combining structure and the third polarization beam combining structure both include two incident parts and one emitting part.
  • the two incident parts of the first polarization beam combining structure respectively receive the signals of the first optical signal channel and the second optical signal channel.
  • the two incident parts of the second polarization beam combining structure respectively receive the corresponding beams of the third optical signal channel and the fourth optical signal channel, and the first polarization beam combining structure is respectively arranged at the front incident position of the polarizer.
  • Beam structure, second polarization beam combining structure, the first beam combining unit of the first output part of the first polarization beam combining structure, and the second beam combining unit of the second output part of the second polarization beam combining structure Do not face the incident end face of the polarizer, a third polarization beam combining structure is arranged behind the polarizer, and the two beam combining units on the emission end face of the polarizer face the third polarization beam combining unit respectively.
  • the two incident parts of the beam structure are arranged, and the exit part of the third polarization beam combining structure combines four beams of light into one beam for output.
  • the first polarization beam combining structure specifically includes a first half-wave plate, a first parallel flat plate, a first reflecting prism, and a first polarization beam combiner, and a first incident position of the first polarization beam combiner is provided with a first polarization beam combiner.
  • a parallel plate, a first half-wave plate is arranged above or below the first parallel plate, a first reflecting prism is arranged at the rear of the first half-wave plate, and the first parallel plate is used for receiving and passing through
  • the second optical signal channel emits a second optical signal
  • the first half-wave plate is used to receive the first optical signal emitted through the first optical signal channel
  • the first reflecting prism will pass through the first half-wave plate after polarization rotation.
  • the first optical signal is reflected to the second incident position of the first polarization beam combiner.
  • the output part of the first polarization beam combiner is the output part of the first polarization beam combiner structure, which converts the two beams to the changed polarization. Linearly polarized lights with orthogonal directions are combined into one beam;
  • the second polarization beam combiner structure specifically includes a second half-wave plate, a second parallel flat plate, a second reflecting prism, and a second polarization beam combiner.
  • a second polarization beam combiner is provided at a first incident position.
  • a parallel plate, a second half-wave plate is arranged above or below the second parallel plate, a second reflecting prism is arranged at the rear of the second half-wave plate, and the second parallel plate is used for receiving and passing through
  • the third optical signal channel emits the third optical signal
  • the second half-wave plate is used to receive the fourth optical signal emitted through the fourth optical signal channel
  • the second reflecting prism will pass through the second half-wave plate after polarization rotation.
  • the fourth optical signal is reflected to the second incident position of the second polarization beam combiner, and the output part of the second polarization beam combiner is the output part of the second polarization beam combiner structure, which changes the polarization of the two beams.
  • Linearly polarized lights with orthogonal directions are combined into one beam;
  • the third polarization beam combiner structure specifically includes a third half-wave plate, a fourth half-wave plate, a third reflecting prism, and a third polarization beam combiner.
  • the first incident position of the third polarization beam combiner is provided with a first incident position.
  • a quadruple half-wave plate, a third half-wave plate is arranged above or below the fourth half-wave plate, a third reflection prism is arranged at the rear of the third half-wave plate, and the third half-wave plate ,
  • the fourth half-wave plate is used to receive the combined light signals formed by combining the first polarization combining structure and the second polarization combining structure, and the third reflecting prism will pass the polarization rotation of the third half-wave plate.
  • the combined light signal is reflected to the second incident position of the third polarization beam combiner, and the output part of the third polarization beam combiner is the output part of the third polarization beam combiner structure, which polarizes the two beams in the direction of
  • the orthogonal combined light beams are transformed into the combined light beams of the same polarization state, and then output the mutually orthogonal polarization state beams to synthesize one light output, thereby realizing the four beams to be combined into one beam;
  • the first half-wave plate and the second half-wave plate are specifically 45° half-wave plates
  • the third half-wave plate and the fourth half-wave plate are specifically 22.5° half-wave plates, and the third and fourth half-wave plates are half-wave plates with different crystal main cross sections;
  • the polarizer is specifically a 45° polarizer
  • the first half-wave plate and the first parallel plate are both arranged up and down along a straight line that forms an angle with the plane parallel to the beam channel.
  • the thickness of the first half-wave plate and the thickness of the first parallel plate are the same;
  • the second half-wave plate and the second parallel plate are both arranged up and down along a straight line that is at an angle to the plane parallel to the beam channel.
  • the thickness of the second half-wave plate and the thickness of the second parallel plate are the same;
  • All the optical devices are not arranged parallel or perpendicular to the plane parallel to the beam channel, so that all the optical devices have a tilt angle, and the return loss of the optical signal at the end face of the optical device is reduced.
  • the first polarization beam combining structure and the second polarization beam combining structure adopt the polarization method for multiplexing.
  • the difference from the traditional optical wavelength division multiplexing is that this solution has high stability and is independent of wavelength and wavelength.
  • the influence of temperature can be used to combine the four beams of CWDM, DWDM and LAN-WDM; then, the two combined beams with orthogonal polarization directions are transformed into combined beams with the same polarization state, and then output orthogonal to each other Polarized light beams are combined into one light output, so that four beams can be combined into one beam; it reduces crosstalk signal and noise between channels, has good isolation, and has low temperature and wavelength-dependent insertion loss, low manufacturing cost, and integration into It can transmit multi-wavelength single-channel optical path to realize the stability and reliability of long-distance transmission of optical signals.
  • Figure 1 is a structure diagram of Zigzag MUX in the prior art
  • Fig. 2 is a structure diagram of an arrayed waveguide grating AWG in the prior art
  • FIG 3 is a schematic diagram of a specific embodiment of the overall structure of the present invention (including working principles);
  • FIG. 4 is a schematic diagram of a specific embodiment of the first polarization beam combining structure of the present invention (including working principles);
  • FIG. 5 is a schematic diagram of a specific embodiment of the second polarization beam combining structure of the present invention (including working principles);
  • FIG. 6 is a schematic diagram of a specific embodiment of the third polarization beam combining structure of the present invention (including working principles);
  • FIG. 7 is a working principle diagram of a 22.5° half-wave plate with different optical axes of the third polarization beam combining structure in a specific embodiment
  • An optical wavelength division multiplexer see Figure 3-7: It includes a first polarization beam combining structure 1, a second polarization beam combining structure 2, a polarizer 3, and a third polarization beam combining structure 4.
  • the beam structure 1, the second polarization beam combining structure 2, and the third polarization beam combining structure 4 each include two incident parts and one emitting part.
  • the two incident parts of the first polarization beam combining structure 1 respectively receive the first optical signal channel
  • the two incident parts of the second polarization combining structure 2 respectively receive the corresponding beams of the third optical signal channel CH3 and the fourth optical signal channel CH4, the front part of the polarizer 3
  • the incident positions are respectively arranged with a first polarization combining structure and a second polarization combining structure, the first beam combining unit of the first emission part of the first polarization combining structure 1, and the second polarization combining structure 2 of the second polarization combining structure.
  • the second beam combining unit of the emitting part faces the incident end surface of the polarizer 3, and a third polarization combining structure 4 is arranged behind the polarizer 3, and the two beam combining units on the emitting end surface of the polarizer 3 are respectively It is arranged toward the two incident parts of the third polarization beam combining structure 4, and the output part of the third polarization beam combining structure 4 combines four beams of light into one beam for output.
  • the first polarization beam combiner structure 1 specifically includes a first half-wave plate 11, a first parallel plate 12, a first reflecting prism 13, and a first polarization beam combiner 14.
  • the first polarization beam combiner 14 is provided with a first incident position
  • the first parallel plate 12 has a first half-wave plate 11 arranged above or below the first parallel plate 12, a first reflecting prism 13 is provided at the rear of the first half-wave plate 11, and the first parallel plate 12 is used for Receiving the second optical signal emitted through the second optical signal channel CH2, the first half-wave plate 11 is used to receive the first optical signal emitted through the first optical signal channel CH1, and the first reflecting prism 13 will be polarized by the first half-wave plate 11
  • the rotated first optical signal is reflected to the second incident position of the first polarization beam combiner 14.
  • the output part of the first polarization beam combiner 14 is the output part of the first polarization beam combiner structure 1, which changes the two beams The linearly polarized light whose polar
  • the second polarization beam combiner structure 2 specifically includes a second half-wave plate 22, a second parallel flat plate 21, a second reflective prism 23, and a second polarization beam combiner 24.
  • the first incident position of the second polarization beam combiner 24 is provided with
  • the second parallel plate 21 has a second half-wave plate 22 arranged above or below the second parallel plate 21, and a second reflecting prism 23 is provided at the rear of the second half-wave plate 22.
  • the second parallel plate 21 is used for Receiving the third optical signal emitted through the third optical signal channel CH3, the second half-wave plate 22 is used to receive the fourth optical signal emitted through the fourth optical signal channel CH4, and the second reflecting prism 23 will be polarized by the second half-wave plate 22
  • the rotated fourth optical signal is reflected to the second incident position of the second polarization beam combiner 24, and the output part of the second polarization beam combiner 24 is the output part of the second polarization beam combining structure 2, which changes the two beams
  • the third polarization beam combiner structure 4 specifically includes a third half-wave plate 41, a fourth half-wave plate 42, a third reflection prism 43, a third polarization beam combiner 44, and the first incident position of the third polarization beam combiner 44 is set There is a fourth half-wave plate 42, a third half-wave plate 41 is arranged above or below the fourth half-wave plate 42, and a third reflecting prism 43 is provided at the rear of the third half-wave plate 41.
  • the plate 41 and the fourth half-wave plate 42 are respectively used to receive the combined light signal formed by combining the first polarization combining structure 1 and the second polarization combining structure 2, and the third reflecting prism 43 will pass through the third half-wave plate 41.
  • the combined light signal after polarization rotation is reflected to the second incident position of the third polarization beam combiner 44.
  • the output part of the third polarization beam combiner 44 is the output part of the third polarization beam combining structure 4, which combines the two
  • the combined light beams with orthogonal polarization directions are transformed into combined light beams of the same polarization state, and then output orthogonal polarization state beams to combine one light output, thereby realizing the four beams to be combined into one beam;
  • the first half wave plate 11 and the second half wave plate 22 are specifically 45° half wave plates
  • the third half-wave plate 41 and the fourth half-wave plate 42 are specifically 22.5° half-wave plates, and the third and fourth half-wave plates are half-wave plates with different crystal main cross sections;
  • the first half-wave plate 11 and the first parallel plate 12 are both arranged up and down along a straight line at an angle to the plane parallel to the beam channel.
  • the thickness of the first half-wave plate 11 and the thickness of the first parallel plate 12 the same;
  • the second half-wave plate 22 and the second parallel plate 21 are both arranged up and down along a straight line at an angle to the plane parallel to the beam channel.
  • the thickness of the second half-wave plate 22 and the thickness of the second parallel plate 21 the same;
  • All the optical devices are not arranged parallel or perpendicular to the plane parallel to the beam channel, so that all the optical devices have a tilt angle, and the return loss of the optical signal at the end face of the optical device is reduced.
  • the first polarization beam combining structure 1 is arranged above the second polarization beam combining structure 2, and the first half-wave plate 11 of the first polarization beam combining structure 1 is located on the first parallel plate 12
  • the second half-wave plate 22 of the second polarization combining structure 2 is located below the second parallel plate 21, and the fourth half-wave plate 42 of the third polarization combining structure 4 is located at the third half-wave plate 41
  • the optical signal of the first optical signal channel CH1 passes through the first half-wave plate 11, the polarization direction is rotated by 90°, and is reflected by the first reflecting prism 13 to the first polarization beam combiner 14, and the optical signal of the second optical signal channel CH2 passes through
  • the first parallel plate 12 is incident on the first incident position of the first polarization beam combiner 14, and the first polarization beam combiner 14 combines two linearly polarized lights with varying polarization directions orthogonal to one beam;
  • the optical signal of the fourth optical signal channel CH4 passes through the second half-wave plate 22, the polarization direction is rotated by 90°, and is reflected by the second reflecting prism 23 to the second polarization beam combiner 24, and the optical signal of the third optical signal channel CH3 passes
  • the second parallel plate 21 is incident on the first incident position of the second polarization beam combiner 24, and the second polarization beam combiner 24 combines two linearly polarized lights with varying polarization directions orthogonal to one beam;
  • the three output optical signals of the polarizer are rotated 45° clockwise using the third half-wave plate 41, and the polarization direction is changed to be parallel to the Y direction, as shown in Figure 7(a), while using the fourth half-wave plate 41.
  • the wave plate 42 rotates another book light signal by 45° counterclockwise, and the polarization direction is changed to be perpendicular to the Y direction, as shown in FIG. 7(b).
  • the third reflecting prism 43 is used to reflect the output optical signal of the third half-wave plate 41, and transmit it to the third polarization beam combiner 44, and at the same time output the optical signal with the fourth half-wave plate 42 to combine the polarization direction orthogonal to the polarization direction. Beam output light.
  • the polarization method is used for multiplexing.
  • the difference from the traditional optical wavelength division multiplexing is that this scheme has high stability and is not affected by wavelength and temperature. It can be used for CWDM, DWDM and LAN-WDM four-beam optical multiplexing.
  • the first polarization beam combining structure, the second polarization beam combining structure, the incident position of the light unit is composed of parallel flat plates, 45° half-wave plates, and parallel flat plates 45°, half-wave plates The same thickness, thereby reducing the optical path difference;
  • the third polarization beam combining structure composed of a polarizer, a 22.5° half-wave plate, a reflective prism, and a polarization beam combiner to combine the two beams with orthogonal polarization directions
  • the light beam is transformed into a combined light beam of the same polarization state, and then the mutually orthogonal polarization state beams are outputted to synthesize one light output, thereby realizing the four beams to be combined into one light beam.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un multiplexeur par répartition en longueur d'onde optique, comprenant une première structure de combinaison de faisceau de polarisation (1), une seconde structure de combinaison de faisceau de polarisation (2), un polariseur (3), et une troisième structure de combinaison de faisceau de polarisation (4). La première structure de combinaison de faisceau de polarisation (1), la seconde structure de combinaison de faisceau de polarisation (2) et la troisième structure de combinaison de faisceau de polarisation (4) comprennent chacune deux parties incidentes et une partie d'émission. Les deux parties incidentes de la première structure de combinaison de faisceau de polarisation (1) reçoivent respectivement des faisceaux correspondants d'un premier canal de signal optique (CH1) et d'un deuxième canal de signal optique (CH2). Les deux parties incidentes de la seconde structure de combinaison de faisceau polarisant (2) reçoivent respectivement des faisceaux correspondants d'un troisième canal de signal optique (CH3) et d'un quatrième canal de signal optique (CH4). Des positions d'incidence de partie avant du polariseur (3) sont respectivement pourvues de la première structure de combinaison de faisceau de polarisation (1) et de la seconde structure de combinaison de faisceau de polarisation (2). Ceci réduit le rapport signal sur bruit de diaphonie entre les canaux, assure un degré élevé de séparation, une faible perte d'insertion liée à la température et à la longueur d'onde, et des coûts de fabrication très faibles, il est intégré sous la forme d'un trajet optique à canal unique à longueurs d'onde multiples transmissible, et met en œuvre la stabilité et la fiabilité de la transmission longue distance de signaux optiques.
PCT/CN2020/079756 2019-09-12 2020-03-17 Multiplexeur par répartition en longueur d'onde optique WO2021047159A1 (fr)

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CN110441864A (zh) * 2019-09-12 2019-11-12 亨通洛克利科技有限公司 一种光波分复用器

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US6847786B2 (en) * 1996-10-29 2005-01-25 Ec-Optics Technology, Inc. Compact wavelength filter using optical birefringence and reflective elements
CN203422496U (zh) * 2013-09-18 2014-02-05 福州高意通讯有限公司 一种光发射端波分复用光学结构及光发射模块
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