WO2015045312A1 - Récepteur de lumière et procédé de réception de lumière - Google Patents

Récepteur de lumière et procédé de réception de lumière Download PDF

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Publication number
WO2015045312A1
WO2015045312A1 PCT/JP2014/004684 JP2014004684W WO2015045312A1 WO 2015045312 A1 WO2015045312 A1 WO 2015045312A1 JP 2014004684 W JP2014004684 W JP 2014004684W WO 2015045312 A1 WO2015045312 A1 WO 2015045312A1
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WO
WIPO (PCT)
Prior art keywords
polarization
optical
interference
optical signal
polarization component
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PCT/JP2014/004684
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English (en)
Japanese (ja)
Inventor
高橋　森生
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日本電気株式会社
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Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Publication of WO2015045312A1 publication Critical patent/WO2015045312A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers

Definitions

  • the present invention relates to an optical receiver and an optical receiving method used in an optical communication system, and more particularly to an optical receiver and an optical receiving method using digital coherent technology.
  • the digital coherent technology can dramatically increase the transmission capacity while utilizing the existing optical fiber network by using the polarization multiplexing technology and the multilevel phase modulation technology in addition to the wavelength multiplexing technology.
  • optical devices that receive signal light include polarization separation of multiplexed optical signals, conversion of phase-modulated optical signals to intensity-modulated optical signals, conversion of optical signals to electrical signals, etc. Therefore, integration of a plurality of functions is required.
  • an element called an optical hybrid mixer is generally used as an element that converts a phase-modulated optical signal into an intensity-modulated optical signal.
  • the optical hybrid mixer converts the phase-modulated optical signal into an intensity-modulated optical signal by causing interference between the signal light propagated through the optical fiber and the local light that has not been modulated and has a constant amplitude and phase.
  • Patent Document 1 discloses a general optical hybrid mixer formed on an optical waveguide.
  • Patent Document 2 discloses an optical waveguide circuit including a polarization separation element and an optical hybrid mixer. The optical waveguide circuit described in Patent Document 2 first performs polarization separation on both the signal light L1 and the local light L2, and then separately inputs the separated polarization components to the 90-degree hybrid elements 41 and 61, respectively.
  • Patent Document 3 describes an optical receiver including a polarization rotation element.
  • An object of the present invention is to provide an optical receiver that is advantageous for downsizing and cost reduction.
  • the polarization multiplexed optical signal obtained by multiplexing the first optical signal having the first polarization component and the second optical signal having the second polarization component, the third polarization component, and the fourth And a polarization multiplexed interference optical signal in which the first interference optical signal having the third polarization component and the second interference optical signal having the fourth polarization component are multiplexed.
  • An optical interference unit that performs polarization separation of the polarization multiplexed interference optical signal into the first interference optical signal and the second interference optical signal;
  • An optical receiver is provided.
  • the polarization multiplexed optical signal obtained by multiplexing the first optical signal having the first polarization component and the second optical signal having the second polarization component, the third polarization component, and the fourth Polarization multiplexed interference optical signal in which the first interference optical signal having the third polarization component and the second interference optical signal having the fourth polarization component are multiplexed.
  • the polarization multiplexed interference optical signal is polarized and separated into the first interference optical signal and the second interference optical signal.
  • FIG. 1 is a diagram illustrating a configuration of an optical receiver 100 according to the present embodiment.
  • the optical receiver 100 includes an optical interference unit 1 that causes interference between a polarization multiplexed optical signal obtained by multiplexing an optical signal having a polarization component P1 and an optical signal having a polarization component P2, and local light having a polarization component X and a polarization component Y. Is provided. Further, the optical interference unit 1 outputs a polarization multiplexed interference optical signal in which an interference optical signal having a polarization component X and an interference optical signal having a polarization component Y are multiplexed.
  • the optical receiver 100 further includes a polarization separation unit 2 that separates the polarization multiplexed interference light signal into an interference light signal having the polarization component X and an interference light signal having the polarization component Y.
  • FIG. 2 is a flowchart showing the operation of the optical receiver 100.
  • the optical interference unit 1 causes a polarization multiplexed optical signal obtained by multiplexing an optical signal having a polarization component P1 and an optical signal having a polarization component P2 to interfere with local light having polarization components X and Y. Further, the optical interference unit 1 outputs a polarization multiplexed interference optical signal in which the interference optical signal having the polarization component X and the interference optical signal having the polarization component Y are multiplexed (step S11). Then, the polarization separation unit 2 separates the polarization multiplexed interference light signal output from the optical interference unit 1 into an interference light signal having the polarization component X and an interference light signal having the polarization component Y (step S12).
  • the optical interference unit does not need to include an optical interference unit for each polarization multiplexed optical signal input to the optical receiver 100. Since the optical receiver 100 can be reduced in size, an optical receiver that is advantageous for downsizing and cost reduction can be provided.
  • the polarization components P1 and P2 have different polarization components, and may be either linearly polarized light or rotationally polarized light.
  • the polarization components X and Y separated by the polarization separation unit 2 are linearly polarized light and are orthogonal to each other.
  • the local light input to the optical interference unit 1 is linearly polarized light having a polarization component having an intermediate angle between the X and Y polarization angles.
  • 3A to 3C are diagrams respectively showing examples of the linearly polarized light component X, the linearly polarized light component Y, and the local light polarized light component of the polarization multiplexed optical signal in the optical receiver according to the present embodiment.
  • the linearly polarized light component X is set to a polarization angle of 0 ° (FIG. 3A) and the linearly polarized light component Y is set to 90 ° (FIG. 3B)
  • the polarization component of local light is 45 ° (FIG. 3C).
  • the polarization component of the local light has a polarization component having an intermediate angle between the two linear polarization components of the polarization multiplexed interference optical signal.
  • the optical receiver 100 can cause local light to equally interfere with optical signals having respective polarization components.
  • variation in signal characteristics after interference for each polarization is suppressed.
  • the polarization angle of the local light does not have to be exactly an intermediate value between the polarization angles of the polarization components X and Y as long as the variation in the characteristics of the signal after interference is allowed.
  • FIG. 4 is a diagram illustrating a configuration of the optical receiver 200 according to the present embodiment.
  • the optical receiver 200 includes an optical hybrid mixer 10 that causes a polarization multiplexed optical signal and local light to interfere with each other, a polarization separation unit 20 that splits and separates the multiplexed polarization multiplexed interference light, and an optical reception unit 30.
  • the optical hybrid mixer 10 corresponds to the optical interference unit 1 in FIG.
  • the polarization components separated by the polarization separation unit 20 are an optical signal having a linear polarization component X and an optical signal having a linear polarization component Y, and X and Y are orthogonal to each other.
  • the local light input to the optical hybrid mixer 10 is linearly polarized light having a polarization component having an intermediate angle between the X and Y polarization angles, as shown in FIG. 3C.
  • the optical hybrid mixer 10 has a polarization multiplexed optical signal obtained by multiplexing an optical signal having a linear polarization component P1 and an optical signal having a linear polarization component P2, and a polarization component having an intermediate angle between the polarization angles of X and Y. It interferes with local light that is linearly polarized light. Further, the optical hybrid mixer 10 outputs four polarization multiplexed interference optical signals each having a phase difference of ⁇ / 4 (rad). Here, each of the four polarization multiplexed interference light signals has a linearly polarized light component X and a linearly polarized light component Y.
  • the polarization separation unit 20 separates the four polarization multiplexed interference light signals output from the optical hybrid mixer 10 into an interference light signal having a linear polarization component X and an interference light signal having a linear polarization component Y, respectively. A total of eight optical signals are output. Further, the optical receiver 30 receives the eight optical signals output from the polarization separator 20.
  • the optical hybrid mixer since the optical hybrid mixer does not need to include an optical interference unit for each polarization multiplexed optical signal input to the optical receiver 200, the sizes of the optical hybrid mixer 10 and the optical receiver 200 can be reduced. . As the size is reduced, the yield of the optical hybrid mixer 10 from the semiconductor 1 wafer is greatly increased, so that the unit cost of the optical hybrid mixer 10 can be greatly reduced. Further, when two optical hybrid mixers are used, when one optical hybrid mixer has a characteristic defect due to a pattern error or the like in the manufacturing process, the whole is a defective product even if the other is a good product. However, according to the present embodiment, since the optical receiver is composed of one optical hybrid mixer, such a problem is solved and the yield of the optical hybrid mixer is improved.
  • the local light can be caused to interfere equally with the optical signal having each polarization component. .
  • the characteristic variation for each polarization of the signal after interference is suppressed.
  • the optical hybrid mixer in the present embodiment is realized by, for example, a planar optical waveguide (PLC: Planar Lightwave Circuit) made of quartz, a silicon optical waveguide, or the like.
  • PLC Planar Lightwave Circuit
  • the optical hybrid mixer 10 is preferably polarization independent or low polarization dependent.
  • the polarization multiplexed optical signal and the local light may be input to the optical hybrid mixer 10 by, for example, coupling light output from the optical fiber directly to the optical waveguide or condensing it with a lens.
  • an optical fiber mounting V-groove may be formed on the optical hybrid mixer 10 side.
  • 5A to 5C show an example of using the birefringence unit 21, an example using the polarization separation film 22, and an optical path length further using the polarization separation film 22 as the structure of the polarization separation unit 20 according to the present embodiment. It is a figure which shows the example which adjusted each.
  • a birefringent material such as rutile is used for the birefringent portion 21 in FIG. 5A.
  • polarized multiplexed light can be more accurately separated into orthogonally polarized components, so that crosstalk between separated optical signals can be suppressed.
  • FIG. 6 is a diagram illustrating an example of the structure of the optical receiver 30 included in the optical receiver 200.
  • the optical signals having linearly polarized components X and Y output from the polarization separation unit 20 are condensed by the lenses 31-1 and 31-2 and converted into electric signals by the light receiving elements 32-1 and 32-2.
  • the An element in which the light receiving element 32 and the lens 31 are integrated may be used.
  • an array element in which a plurality of light receiving elements 32, lenses 31 or a combination of these elements are arranged may be used.
  • FIG. 7 is a diagram illustrating a configuration of the optical receiver 300 according to the present embodiment.
  • the configuration of the optical receiver 300 is basically the same as that of the optical receiver 200 according to the third embodiment. However, the configuration of the optical receiver 300 is different from that of the optical receiver 200 in that a polarizer 40 is provided in the previous stage of the optical hybrid mixer 10. As shown in FIG. 3C, the polarizer 40 transmits local light having a linearly polarized light component having an angle intermediate between two linearly polarized light components of the polarization multiplexed optical signal.
  • the polarizer 40 has the polarization component of the local light, more precisely, the polarization at an intermediate angle between the two linear polarization components of the polarization multiplexed optical signal. It can be a linear component. For this reason, the optical receiver 300 can further suppress the characteristic variation for each polarization of the signal after interference.
  • (Appendix 1) A polarization multiplexed optical signal in which a first optical signal having a first polarization component and a second optical signal having a second polarization component are multiplexed, and local light having a third polarization component and a fourth polarization component;
  • An optical interference unit that outputs a polarization multiplexed interference optical signal in which the first interference optical signal having the third polarization component and the second interference optical signal having the fourth polarization component are multiplexed;
  • a polarization separator that separates the polarization multiplexed interference optical signal into the first interference optical signal and the second interference optical signal;
  • An optical receiver comprising: (Appendix 2) The third polarization component and the fourth polarization component are linearly polarized light orthogonal to each other; The local light is linearly polarized light having a polarization component having an intermediate angle between the third polarization component and the fourth polarization component, The optical receiver according to appendix 1.
  • the polarization separation unit is a birefringent material, The optical receiver according to appendix 1 or 2.
  • An optical receiver that receives the interference light signal output from the polarization separator;
  • the polarization separator is A polarization separation film for polarization-separating the first interference light signal and the second interference light signal;
  • a first reflection unit that reflects the polarized and separated first interference light signal and inputs the reflected signal to the optical reception unit;
  • a second reflection unit that reflects the polarization-separated second interference light signal and inputs the reflected signal to the optical reception unit.
  • the optical receiver according to any one of appendices 1 to 3.
  • a polarizer that transmits the linearly polarized light component of the local light is provided in a front stage of the optical interference unit, The optical receiver according to any one of appendices 1 to 4.
  • Appendix 6 A polarization multiplexed optical signal in which a first optical signal having a first polarization component and a second optical signal having a second polarization component are multiplexed, and local light having a third polarization component and a fourth polarization component; And outputs a polarization multiplexed interference optical signal in which the first interference optical signal having the third polarization component and the second interference optical signal having the fourth polarization component are multiplexed, Polarization-separating the polarization multiplexed interference optical signal into the first interference optical signal and the second interference optical signal; Optical reception method.
  • the third polarization component and the fourth polarization component are linearly polarized light orthogonal to each other;
  • the polarization multiplexed optical signal is caused to interfere with local light that is linearly polarized light having a polarization component having an intermediate angle between the third polarization component and the fourth polarization component,

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention a pour objet un récepteur de lumière propice à des réductions de taille et de coûts. Ledit récepteur de lumière est équipé de : un moyen d'interférence de lumière qui fait en sorte qu'un signal lumineux multiplexé polarisé, obtenu par multiplexage d'un premier signal lumineux ayant une première composante polarisée et d'un second signal lumineux ayant une deuxième composante polarisée, et une lumière générée localement ayant une troisième composante polarisée et une quatrième composante polarisée interfèrent les uns avec les autres, et qui délivre en sortie un signal lumineux d'interférence multiplexé polarisé obtenu par multiplexage d'un premier signal lumineux d'interférence ayant la troisième composante polarisée et un second signal lumineux d'interférence ayant la quatrième composante polarisée ; et un moyen de séparation de polarisation qui polarise et sépare le signal lumineux d'interférence multiplexé polarisé en un premier signal lumineux d'interférence et en un second signal lumineux d'interférence.
PCT/JP2014/004684 2013-09-25 2014-09-11 Récepteur de lumière et procédé de réception de lumière WO2015045312A1 (fr)

Applications Claiming Priority (2)

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JP2013-197644 2013-09-25
JP2013197644 2013-09-25

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WO2015045312A1 true WO2015045312A1 (fr) 2015-04-02

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009540761A (ja) * 2006-06-23 2009-11-19 アルカテル−ルーセント ユーエスエー インコーポレーテッド コヒーレントな偏波多重化光信号を受け取るためのシステムおよび方法
WO2010080307A1 (fr) * 2008-12-18 2010-07-15 Alcatel-Lucent Usa Inc. Mélangeur optique pour détection cohérente de signaux multiplexés en polarisation
JP2011160028A (ja) * 2010-01-29 2011-08-18 Sumitomo Osaka Cement Co Ltd 光受信器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009540761A (ja) * 2006-06-23 2009-11-19 アルカテル−ルーセント ユーエスエー インコーポレーテッド コヒーレントな偏波多重化光信号を受け取るためのシステムおよび方法
WO2010080307A1 (fr) * 2008-12-18 2010-07-15 Alcatel-Lucent Usa Inc. Mélangeur optique pour détection cohérente de signaux multiplexés en polarisation
JP2011160028A (ja) * 2010-01-29 2011-08-18 Sumitomo Osaka Cement Co Ltd 光受信器

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