WO2014115519A1 - 偏光多重分離光通信受信機、偏光多重分離光通信システム、および偏光多重分離光通信方法 - Google Patents
偏光多重分離光通信受信機、偏光多重分離光通信システム、および偏光多重分離光通信方法 Download PDFInfo
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- WO2014115519A1 WO2014115519A1 PCT/JP2014/000215 JP2014000215W WO2014115519A1 WO 2014115519 A1 WO2014115519 A1 WO 2014115519A1 JP 2014000215 W JP2014000215 W JP 2014000215W WO 2014115519 A1 WO2014115519 A1 WO 2014115519A1
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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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
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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
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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
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6166—Polarisation demultiplexing, tracking or alignment of orthogonal polarisation components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
Definitions
- the present invention relates to a polarization multiplexing / demultiplexing optical communication technique, and particularly to a polarization multiplexing / demultiplexing optical communication receiver, a polarization multiplexing / demultiplexing optical communication system, and a polarization demultiplexing / demultiplexing optical communication method that realize transmission with high reliability.
- Polarization demultiplexing technology multiplexes two independent optical signals whose optical states are arranged in the same frequency band and whose polarization states are orthogonal to each other in an optical transmitter. Further, in the optical receiver, the two independent optical signals are separated from the received signal to realize a double transmission rate.
- an optical phase modulation method such as QPSK (Quadrature Phase Shift Keying)
- QPSK Quadrature Phase Shift Keying
- Non-Patent Document 1 discloses a technique for suppressing optical noise caused by a nonlinear optical effect received by an optical signal during optical fiber transmission in a polarization multiplexing / demultiplexing optical communication system using an optical phase modulation method and polarization multiplexing / demultiplexing technology.
- the technique disclosed in Non-Patent Document 1 gives temporal variations of different optical phases to two independent optical signals in an optical transmitter, and optically receives the temporal variations of the applied optical phases. Compensate in the machine. As a result, optical noise caused by the nonlinear optical effect generated between two independent optical signals is suppressed, and transmission characteristics are improved.
- Non-Patent Document 1 can be further enhanced by adding the effects described below. That is, it is possible to specify whether two independent optical signals output after being subjected to polarization separation processing in the optical receiver are any of the two independent optical signals generated in the optical transmitter. Is to be able to do it. As a result, it is possible to reliably identify the temporal variation amount of the optical phase given to the optical signal subjected to polarization separation, and to reliably compensate the temporal variation of the optical phase. As a result, the processing for compensating the optical carrier frequency deviation and the optical phase deviation can be reliably operated, and the bit string can be reliably restored.
- the following methods are generally used as a method of specifying two independent optical signals separated by polarization. That is, in the optical transmitter, different specific bit sequences (training patterns) are inserted into the respective optical signals, and the optical signal is based on the result of collating the specific bit sequences included in the restored bit sequence in the optical receiver. It is a method of identifying. However, this method is not appropriate when there is a possibility that the bit string cannot be correctly restored.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to transmit two independent optical signals output after being subjected to polarization separation processing by an optical receiver of a polarization demultiplexing optical communication system. Identifying which of the two independent optical signals generated by the machine.
- a polarization demultiplexed optical communication receiver, a polarization demultiplexed optical communication system, and a polarization demultiplexed optical communication method that achieve high reliability are provided.
- a polarization demultiplexing optical communication receiver is a polarization demultiplexing optical communication receiver that receives and demultiplexes two multiplexed optical signals having orthogonal polarization states and the same carrier frequency band. After the polarization separation of the two multiplexed optical signals to which the signal quality fluctuation is given, the signal quality fluctuation giving means for giving a signal quality fluctuation to the two multiplexed optical signals, and the signal quality fluctuation, Signal quality monitoring means for comparing the signal qualities of the two optical signals and identifying the two optical signals based on the comparison result.
- the polarization demultiplexing optical communication system includes a polarization demultiplexing optical communication transmitter that multiplexes and transmits two optical signals having orthogonal polarization states and the same carrier frequency band, and the multiplexed demultiplexing optical communication transmitter.
- a polarization multiplexing / demultiplexing optical communication receiver that receives and optically separates two optical signals, and the polarization demultiplexing optical communication receiver is a signal that imparts a signal quality variation to the multiplexed optical signals.
- the quality variation applying means and after the polarization separation of the multiplexed two optical signals to which the signal quality variation has been applied, the signal quality of each of the two optical signals is compared, and the comparison result And a signal quality monitoring means for specifying the two optical signals.
- the polarization multiplexing / demultiplexing optical communication method multiplexes and transmits two optical signals having orthogonal polarization states and the same carrier frequency band, and receives the multiplexed optical signals.
- the polarization multiplexing / demultiplexing optical communication method that performs polarization separation, the multiplexed two optical signals to which the received two multiplexed optical signals are given signal quality fluctuations and the signal quality fluctuations are given.
- the signal qualities of the two optical signals are compared, and the two optical signals are specified based on the comparison result.
- two independent optical signals output after being subjected to polarization separation processing by the optical receiver of the polarization demultiplexing optical communication system are among the two independent optical signals generated by the optical transmitter. It is possible to specify which one of these.
- the polarization demultiplexing optical communication receiver, the polarization demultiplexing optical communication system, and the polarization demultiplexing optical communication method that realize high reliability can be provided.
- FIG. 1 is a block diagram showing a configuration of a polarization multiplexed / demultiplexed optical communication receiver 10 of the present embodiment.
- the polarization demultiplexing optical communication receiver 10 is a polarization demultiplexing optical communication receiver for receiving and demultiplexing two multiplexed optical signals having orthogonal polarization states and the same carrier frequency band. Furthermore, a signal quality fluctuation applying unit 11 is provided for applying a signal quality fluctuation to the two multiplexed optical signals. Further, after the polarization separation of the two multiplexed optical signals to which the signal quality variation is given, the signal quality of each of the two optical signals is compared, and based on the comparison result, Signal quality monitoring means for specifying the two optical signals is provided.
- FIG. 2 is a block diagram illustrating a configuration of the optical transmitter 100 of the polarization multiplexed optical communication system according to the present embodiment.
- the optical transmitter 100 includes a laser oscillator 101, frequency shifters 102-1 and 102-2, optical phase modulators 103-1 and 103-2, drive signal generators 104-1 and 104-2, and a polarization multiplexing unit 105.
- the frequency shifter 102-1 and the frequency shifter 102-2 are shifted by the frequencies having mutually different signs and equal absolute values. Shifted.
- the oscillation frequency of continuous light is fc and the absolute value of the frequency shift amount is ⁇ f
- the optical frequencies of continuous light output from the frequency shifter 102-1 and the frequency shifter 102-2 are fc + ⁇ f and fc ⁇ , respectively. ⁇ f.
- the optical phase modulator 103-1 modulates the continuous light output from the frequency shifter 102-1 with the drive signal generated from the transmission bit string by the drive signal generator 104-1.
- the operations of the optical phase modulator 103-2 and the drive signal generator 104-2 are the same.
- the two independent optical signals output from the optical phase modulators 103-1 and 103-2 have the same carrier frequency band, and are further polarization-multiplexed by the polarization multiplexing unit 105 so that their polarization states are orthogonal to each other. Then, it is transmitted to the optical transmission line.
- FIG. 3 is a block diagram showing the configuration of the optical receiver 200 of the polarization multiplexed optical communication system according to this embodiment.
- the optical receiver 200 includes a 90-degree optical hybrid 201, optical detectors 202-1 to 20-4, and ADCs (analog / digital converters) 203-1 to 203-4. Further, a polarization separation unit 204, a frequency shift compensation unit 205, an optical carrier frequency deviation / optical phase deviation compensation unit 206-1 and 206-2, symbol identification units 207-1 and 20-2, and an optical transmitter information input interface 208 are provided. Further, a control unit 209, a signal quality variation applying unit 210, and a signal quality monitoring unit 211 are provided.
- the optical transmission signal transmitted from the optical transmitter 100 is input to the optical receiver 200 (optical reception signal). Further, the local oscillation light from the local light oscillation unit 212 having substantially the same oscillation frequency as that of the laser oscillator 101 is input to the 90-degree optical hybrid 201 and interferes therewith. Thereafter, the four output optical signals of the 90-degree optical hybrid 201 are output. Each optical signal is converted into an electric signal by the optical detectors 202-1 to 202-1, and then converted into a digital signal of four channels by the ADCs 203-1 to 20.
- the signal quality fluctuation adding unit 210 does not do anything until the polarization separation processing of the polarization separation unit 204 is stabilized after the reception of the optical reception signal in the optical receiver 200 is stabilized, and simply performs the digital processing of the four channels.
- the signal is bypassed and sent to the polarization separation unit 204.
- the polarization separation unit 204 separates the 4-channel digital signal into two independent optical signals by performing polarization separation processing using an algorithm such as CMA (Constant Modulus Algorithm), and outputs the signal as a digital signal.
- CMA Constant Modulus Algorithm
- the signal quality monitoring unit 211 confirms that the quality of the optical reception signal is stabilized from the cost value of the reception signal calculated by the polarization separation unit 204. That is, when the polarization separation process of the polarization separation unit 204 converges, the control unit 209 uses the signal quality variation applying unit 210 to apply different quality variations to the two independent optical signals.
- the signal quality variation applying unit 210 is configured as a filter circuit, and the filter circuit coefficient is set to one of the two independent optical signals as the filter center frequency and the optical spectrum band as the filter band. Sets the coefficient of the rectangular filter.
- the filter center frequency one of fc + ⁇ f and fc ⁇ f calculated from fc and ⁇ f, which are information of the optical transmitter 100 input from the optical transmitter information input interface 208, is used.
- the center frequency of the filter is fc + ⁇ f.
- the filter band is set to be equal to or higher than the analog band of ADCs 203-1 to 20-4 and lower than the optical spectrum band of the optical signal.
- one of the two independent optical signals that is, the optical signal of fc + ⁇ f mainly cut out by the rectangular filter is input to the polarization separation unit 204, so that the signal quality of the output signal of the polarization separation unit 204 is , Fc + ⁇ f, and fc ⁇ f all deteriorate.
- the degradation amount of the cut out fc + ⁇ f optical signal is smaller than the degradation amount of fc ⁇ f.
- the signal with a small signal quality degradation confirmed by the signal quality monitoring unit 211 is an optical signal to which a frequency shift of + ⁇ f is given in the optical transmitter 100, and the other is given a frequency shift of ⁇ f. It turns out that it is an optical signal.
- the cost of the polarization separation processing algorithm can be used as an indicator of signal quality monitored by the signal quality monitoring unit 211.
- CMA Constant Modulus Algorithm
- CMA Constant Modulus Algorithm
- control unit 209 After specifying the optical signal given the frequency shift of + ⁇ f and the optical signal given the frequency shift of ⁇ f in the optical transmitter 100, the control unit 209 simply sends the signal quality fluctuation giving unit 210 to Make sure to bypass the signal.
- the frequency shift compensation unit 205 compensates the frequency shift of each optical signal based on the frequency shift amounts of two independent optical signals output from the polarization separation unit 204 notified from the control unit 209. That is, the frequency shift compensator 205 compensates for the frequency shift given to two independent optical signals by the frequency shifters 102-1 and 102-2 of the optical transmitter 100.
- the frequency shift amount is input by the optical transmitter information input interface 208, for example, by an administrator of the optical communication system.
- the optical carrier frequency deviation / optical phase deviation compensation units 206-1 and 206-2 compensate the optical frequency deviation and optical phase deviation between the optical signal and the local oscillation light for each of the two independent optical signals.
- Symbol identifying sections 207-1 and 20-2 perform symbol determination on each of two independent optical signals that are output signals of optical carrier frequency deviation / optical phase deviation compensation sections 206-1 and 206-2, and then, after the symbol determination, Restore.
- two independent optical signals that are output after being subjected to polarization separation processing by the optical receiver 200 are generated by the two independent optical signals generated by the optical transmitter 100. It becomes possible to specify which of the optical signals.
- a polarization multiplexed / demultiplexed optical communication receiver, a polarization multiplexed / demultiplexed optical communication system, and a polarization multiplexed / demultiplexed optical communication method having high reliability can be realized.
- An optical communication method can be realized.
- FIG. 5 is a block diagram showing a configuration of an optical receiver 400 as a comparative example.
- the optical receiver 400 includes a 90-degree optical hybrid 201, optical detectors 202-1 to 20, and ADCs 203-1 to 4 (analog / digital converters). Further, a polarization separation unit 204, a frequency shift compensation unit 205, an optical carrier frequency deviation / optical phase deviation compensation unit 206-1 and 206-2, symbol identification units 207-1 and 20-2, and an optical transmitter information input interface 208 are provided.
- the optical transmission signal transmitted from the optical transmitter (for example, the optical transmitter 100 of the second embodiment) is input to the optical receiver 400 (optical reception signal). Further, the local oscillation light from the local light oscillation unit 212 having substantially the same oscillation frequency as that of the laser oscillator 101 is input to the 90-degree optical hybrid 201 and interferes, and then output as four output optical signals of the 90-degree optical hybrid 201. Is done. Each optical signal is converted into an electric signal by the optical detectors 202-1 to 202-1, and then converted into a digital signal of four channels by the ADCs 203-1 to 20.
- the polarization separation unit 204 separates a 4-channel digital signal into two independent optical signals by performing polarization separation processing using an algorithm such as CMA (Constant Modulus Algorithm), and outputs the signal as a digital signal.
- CMA Constant Modulus Algorithm
- the frequency shift compensation unit 205 compensates the frequency shift given to the two independent optical signals by the frequency shifters 102-1 and 10-2 of the optical transmitter 100.
- the frequency shift amount is input by the administrator of the optical communication system through the optical transmitter information input interface 208.
- the optical carrier frequency deviation / optical phase deviation compensation units 206-1 and 206-2 compensate the optical frequency deviation and optical phase deviation between the optical signal and the local oscillation light for each of the two independent optical signals.
- Symbol identifying units 207-1 and 20-2 that perform identification of two independent optical signals perform symbol determination for each of the output signals of the optical carrier frequency deviation / optical phase deviation compensating units 206-1 and 206-2, Restore the bit string.
- the frequency shift given in the optical transmitter 100 is compensated by the frequency shift compensator 205, which exceeds the compensation range of the optical carrier frequency deviation / optical phase deviation compensators 206-1 and 206-2.
- Such a frequency shift can also be demodulated.
- FIG. 4 is a block diagram showing the configuration of the optical receiver 300 according to the third embodiment of the present invention.
- the optical receiver 300 according to the third embodiment does not include the frequency shift compensation unit 205, and the frequency shift amount is notified from the control unit 209 to the optical carrier frequency deviation / optical phase deviation compensation units 206-1 and 206-2. This is different from the optical receiver 200 of the second embodiment.
- the optical carrier frequency deviation / optical phase deviation compensation units 206-1 and 206-2 perform processing for compensating for the optical frequency deviation between the center frequency of the optical reception signal and the oscillation frequency of the local oscillation light. Do.
- the frequency shift given to the optical signal by the frequency shifters 102-1 and 102-2 of the optical transmitter 100 can also be regarded as a part of the frequency deviation. Therefore, if the sum of the optical frequency deviation and the frequency shift amount is within the compensation range of the optical carrier frequency deviation / optical phase deviation compensation units 206-1 and 206-2, the optical signal can be transmitted without the frequency shift compensation unit 205. Demodulation is possible.
- the compensable range of the optical carrier frequency deviation / optical phase deviation compensators 206-1 and 206-2 is the range obtained by adding the frequency shift amount to the original compensable range, so that the optical signal can be demodulated.
- Appendix 1 In a polarization multiplexing / demultiplexing optical communication receiver that receives and demultiplexes two multiplexed optical signals that have orthogonal polarization states and the same carrier frequency band, the multiplexed optical signals are converted into the multiplexed optical signals.
- a signal quality variation applying means for applying a signal quality variation; and the polarization separation of the two multiplexed optical signals to which the signal quality variation is imparted, and then the signal quality of each of the two optical signals.
- a polarization multiplexing / demultiplexing optical communication receiver comprising: signal quality monitoring means for comparing and identifying the two optical signals based on the comparison result.
- Polarization demultiplexing optical communication transmitter for multiplexing and transmitting two optical signals having the same polarization state and the same carrier frequency band, and receiving and multiplexing the two multiplexed optical signals
- a polarization demultiplexing optical communication receiver comprising: a polarization demultiplexing optical communication receiver, wherein the polarization demultiplexing optical communication receiver is the polarization demultiplexing optical communication receiver according to one of appendices 1 to 6.
- the polarization multiplexing / demultiplexing optical communication transmitter includes frequency shift means for periodically changing the phase difference between the two optical signals, and the polarization demultiplexing optical communication receiver is a light receiving the phase difference information.
- the phase difference between the two optical signals is compensated based on transmitter information input means, information on the phase difference input to the optical transmitter information input means, and identification results of the two optical signals.
- the polarization demultiplexing optical communication receiver includes: a local light generating unit that generates local light; and a polarization separating unit that performs the polarization separation after causing the local light and the multiplexed two optical signals to interfere with each other.
- the frequency deviation compensation means provided at a subsequent stage of the frequency shift compensation means for compensating for a frequency deviation between the local light and the two optical signals, according to one of appendices 7 to 9, Polarization demultiplexing optical communication system.
- a polarization multiplexing / demultiplexing optical communication method In a polarization multiplexing / demultiplexing optical communication method, two optical signals having orthogonal polarization states and the same carrier frequency band are multiplexed and transmitted, and the two multiplexed optical signals are received and polarized and separated. A signal quality variation is applied to the two multiplexed optical signals received, and the two multiplexed optical signals to which the signal quality variation is imparted are polarized and separated, A polarization multiplexing / demultiplexing optical communication method for comparing signal qualities of optical signals and identifying the two optical signals based on the comparison result.
- the polarization multiplexed demultiplexing optical communication method according to one of appendices 11 to 14, wherein the signal quality variation is given by bypassing the optical signal after specifying the two optical signals.
- Appendix 16 16.
- the present invention can be used as a technique for realizing an ultra-high-speed long-distance optical communication system that can cope with a rapid increase in the traffic volume of a backbone network due to the spread of the Internet.
- Signal quality monitoring means 100 Optical transmitter 101 Laser oscillator 102-1 and 102-2 Frequency shifter 103-1 and 103-2 Optical phase modulator 104-1 104-2 Drive signal generator 105 Polarization multiplexer 200, 300, 400 Optical receiver 201 90 degree optical hybrid 202-1, 202-2, 202-3, 202-4 Optical detector 203-1, 203-2, 203 -3, 203-4 ADC (analog / digital converter) 204 Polarization Separator 205 Frequency Shift Compensator 206-1, 206-2 Optical Carrier Frequency Deviation / Optical Phase Deviation Compensator 207-1, 207-2 Symbol Identification Unit 208 Optical Transmitter Information Input Interface 209 Control Unit 210 Signal Quality Variation Giving unit 211 Signal quality monitoring unit 212 Local light oscillation unit
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Abstract
Description
(第1の実施形態)
本発明の第1の実施形態について図面を参照して詳細に説明する。図1は、本実施形態の偏光多重分離光通信受信機10の構成を示すブロック図である。
(第2の実施形態)
本発明の第2の実施形態について図面を参照して詳細に説明する。図2は、本実施形態の偏光多重光通信システムの光送信機100の構成を示すブロック図である。光送信機100は、レーザ発振器101、周波数シフタ102-1~2、光位相変調器103-1~2、駆動信号生成器104-1~2、偏光多重部105を備えている。
(比較例)
本発明の第2の実施形態の比較例としての偏光多重光通信システムの光受信機の構成および動作を、図5を用いて説明する。
(第3の実施形態)
図4は、本発明の第3の実施形態における光受信機300の構成を示すブロック図である。第3の実施形態の光受信機300は、周波数シフト補償部205を備えず、制御部209から光搬送波周波数偏差・光位相偏差補償部206-1~2に周波数シフト量が通知される点において、第2の実施形態の光受信機200と異なる。
(付記1)
偏光状態が直交しかつ搬送波の周波数帯が同一である多重化された2個の光信号を受信し偏光分離する偏光多重分離光通信受信機において、前記多重化された前記2個の光信号に信号品質変動を付与する信号品質変動付与手段と、前記信号品質変動を付与した前記多重化された前記2個の光信号を前記偏光分離した後に、前記2個の光信号の各々の信号品質を比較し、前記比較した結果に基づいて、前記2個の光信号を特定する信号品質監視手段と、を備えた、偏光多重分離光通信受信機。
(付記2)
前記信号品質変動付与手段は、フィルタ回路である、付記1記載の偏光多重分離光通信受信機。
(付記3)
前記フィルタ回路は、前記2個の光信号のいずれか一方の中心周波数をフィルタ中心周波数とし、かつ前記光信号の光スペクトル帯域をフィルタ帯域とするフィルタ係数を有する、付記2記載の偏光多重分離光通信受信機。
(付記4)
前記信号品質変動付与手段は、前記偏光分離が安定化した後に前記信号品質変動を付与する、付記1から3の内の1項記載の偏光多重分離光通信受信機。
(付記5)
前記信号品質変動付与手段は、前記信号品質監視手段が前記2個の光信号を特定した後は、前記光信号をバイパスする、付記1から4の内の1項記載の偏光多重分離光通信受信機。
(付記6)
前記信号品質監視手段は、前記偏光分離のアルゴリズムのコストにより前記信号品質を比較する、付記1から5の内の1項記載の偏光多重分離光通信受信機。
(付記7)
偏光状態が直交しかつ搬送波の周波数帯が同一である2個の光信号を多重化して送信する偏光多重分離光通信送信機と、前記多重化した前記2個の光信号を受信し偏光分離する偏光多重分離光通信受信機とを備え、前記偏光多重分離光通信受信機は、付記1から6の内の1項記載の偏光多重分離光通信受信機である、偏光多重分離光通信システム。
(付記8)
前記偏光多重分離光通信送信機は、前記2個の光信号の位相差を周期的に変化させる周波数シフト手段を備え、前記偏光多重分離光通信受信機は、前記位相差の情報を入力する光送信機情報入力手段と、前記光送信機情報入力手段に入力した前記位相差の情報と前記2個の光信号の特定結果とに基づいて、前記2個の光信号の前記位相差を補償する周波数シフト補償手段と、を備えた、付記7記載の偏光多重分離光通信システム。
(付記9)
前記周波数シフト手段は、前記2個の光信号の少なくとも一方に周波数偏差を加えることにより、前記2個の光信号の位相差を周期的に変化させる、付記7または8記載の偏光多重分離光通信システム。
(付記10)
前記偏光多重分離光通信受信機は、局所光を発生する局所光発生手段と、前記局所光と前記多重化した前記2個の光信号とを干渉させてから前記偏光分離を行う偏光分離手段と、前記周波数シフト補償手段の後段に設けられ、前記局所光と前記2個の光信号との周波数偏差を補償する周波数偏差補償手段と、を備えた、付記7から9の内の1項記載の偏光多重分離光通信システム。
(付記11)
偏光状態が直交しかつ搬送波の周波数帯が同一である2個の光信号を多重化して送信し、前記多重化した前記2個の光信号を受信し偏光分離する、偏光多重分離光通信方法において、前記受信した前記多重化した前記2個の光信号に信号品質変動を付与し、前記信号品質変動を付与した前記多重化した前記2個の光信号を前記偏光分離した後に、前記2個の光信号の各々の信号品質を比較し、前記比較した結果に基づいて、前記2個の光信号を特定する、偏光多重分離光通信方法。
(付記12)
前記信号品質変動の付与は、フィルタ回路により行う、付記11記載の偏光多重分離光通信方法。
(付記13)
前記フィルタ回路は、前記2個の光信号のいずれか一方の中心周波数をフィルタ中心周波数とし、かつ前記光信号の光スペクトル帯域をフィルタ帯域とするフィルタ係数を有する、付記12記載の偏光多重分離光通信方法。
(付記14)
前記信号品質変動の付与は、前記偏光分離が安定化した後に行う、付記11から13の内の1項記載の偏光多重分離光通信方法。
(付記15)
前記信号品質変動の付与は、前記2個の光信号を特定した後は、前記光信号をバイパスする、付記11から14の内の1項記載の偏光多重分離光通信方法。
(付記16)
前記信号品質の比較は、前記偏光分離のアルゴリズムのコストにより行う、付記11から15の内の1項記載の偏光多重分離光通信方法。
11 信号品質変動付与手段
12 信号品質監視手段
100 光送信機
101 レーザ発振器
102-1、102-2 周波数シフタ
103-1、103-2 光位相変調器
104-1、104-2 駆動信号生成器
105 偏光多重部
200、300、400 光受信機
201 90度光ハイブリッド
202-1、202-2、202-3、202-4 光ディテクタ
203-1、203-2、203-3、203-4 ADC(アナログディジタルコンバータ)
204 偏光分離部
205 周波数シフト補償部
206-1、206-2 光搬送波周波数偏差・光位相偏差補償部
207-1、207-2 シンボル識別部
208 光送信機情報入力インタフェース
209 制御部
210 信号品質変動付与部
211 信号品質監視部
212 局所光発振部
Claims (10)
- 偏光状態が直交しかつ搬送波の周波数帯が同一である多重化された2個の光信号を受信し偏光分離する偏光多重分離光通信受信機において、
前記多重化された前記2個の光信号に信号品質変動を付与する信号品質変動付与手段と、
前記信号品質変動を付与した前記多重化された前記2個の光信号を前記偏光分離した後に、前記2個の光信号の各々の信号品質を比較し、前記比較した結果に基づいて、前記2個の光信号を特定する信号品質監視手段と、を備えた、
偏光多重分離光通信受信機。 - 前記信号品質変動付与手段は、フィルタ回路である、請求項1記載の偏光多重分離光通信受信機。
- 前記フィルタ回路は、前記2個の光信号のいずれか一方の中心周波数をフィルタ中心周波数とし、かつ前記光信号の光スペクトル帯域をフィルタ帯域とするフィルタ係数を有する、請求項2記載の偏光多重分離光通信受信機。
- 前記信号品質変動付与手段は、前記偏光分離が安定化した後に前記信号品質変動を付与する、請求項1から3の内の1項記載の偏光多重分離光通信受信機。
- 前記信号品質変動付与手段は、前記信号品質監視手段が前記2個の光信号を特定した後は、前記光信号をバイパスする、請求項1から4の内の1項記載の偏光多重分離光通信受信機。
- 偏光状態が直交しかつ搬送波の周波数帯が同一である2個の光信号を多重化して送信する偏光多重分離光通信送信機と、前記多重化した前記2個の光信号を受信し偏光分離する偏光多重分離光通信受信機とを備え、
前記偏光多重分離光通信受信機は、請求項1から5の内の1項記載の偏光多重分離光通信受信機である、偏光多重分離光通信システム。 - 前記偏光多重分離光通信送信機は、
前記2個の光信号の位相差を周期的に変化させる周波数シフト手段を備え、
前記偏光多重分離光通信受信機は、
前記位相差の情報を入力する光送信機情報入力手段と、
前記光送信機情報入力手段に入力した前記位相差の情報と前記2個の光信号の特定結果とに基づいて、前記2個の光信号の前記位相差を補償する周波数シフト補償手段と、を備えた、請求項6記載の偏光多重分離光通信システム。 - 前記周波数シフト手段は、前記2個の光信号の少なくとも一方に周波数偏差を加えることにより、前記2個の光信号の位相差を周期的に変化させる、請求項6または7記載の偏光多重分離光通信システム。
- 前記偏光多重分離光通信受信機は、
局所光を発生する局所光発生手段と、
前記局所光と前記多重化した前記2個の光信号とを干渉させてから前記偏光分離を行う偏光分離手段と、
前記周波数シフト補償手段の後段に設けられ、前記局所光と前記2個の光信号との周波数偏差を補償する周波数偏差補償手段と、を備えた、
請求項6から8の内の1項記載の偏光多重分離光通信システム。 - 偏光状態が直交しかつ搬送波の周波数帯が同一である2個の光信号を多重化して送信し、前記多重化した前記2個の光信号を受信し偏光分離する、偏光多重分離光通信方法において、
前記受信した前記多重化した前記2個の光信号に信号品質変動を付与し、
前記信号品質変動を付与した前記多重化した前記2個の光信号を前記偏光分離した後に、前記2個の光信号の各々の信号品質を比較し、前記比較した結果に基づいて、前記2個の光信号を特定する、偏光多重分離光通信方法。
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