WO2019168092A1 - Récepteur optique et procédé de réception optique - Google Patents

Récepteur optique et procédé de réception optique Download PDF

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Publication number
WO2019168092A1
WO2019168092A1 PCT/JP2019/007791 JP2019007791W WO2019168092A1 WO 2019168092 A1 WO2019168092 A1 WO 2019168092A1 JP 2019007791 W JP2019007791 W JP 2019007791W WO 2019168092 A1 WO2019168092 A1 WO 2019168092A1
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Prior art keywords
optical
signal
optical signal
frequency
determination condition
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PCT/JP2019/007791
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English (en)
Japanese (ja)
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裕太 五江渕
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日本電気株式会社
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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
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • 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

Definitions

  • the present invention relates to an optical receiver and an optical reception method, and more particularly to an optical receiver and an optical reception method having a function of determining the state of an optical signal to be received.
  • a general optical receiver that receives an optical signal and demodulates a data signal outputs an alarm indicating that the optical signal cannot be detected to the outside of the optical receiver.
  • Such an alarm is called an “optical signal loss alarm” or an “optical signal loss alarm”.
  • the optical signal loss alarm is issued when the power (intensity) of the received optical signal is less than a predetermined threshold, and is canceled when the intensity of the received optical signal is greater than or equal to the threshold. If the intensity of the optical signal falls below a threshold during reception of the optical signal, the optical receiver issues an optical signal loss alarm. When the optical signal loss alarm is issued, for example, the processing of the data signal in the circuit at the subsequent stage of the optical receiver is stopped.
  • the optical receiver determines that the optical signal has been received. As a result, the optical signal loss alarm is canceled. The processing of the data signal is resumed by releasing the optical signal loss alarm.
  • Patent Document 1 discloses a configuration of an optical receiver used in a digital coherent system.
  • Patent Document 2 discloses a configuration in which a bias voltage of an optical modulator is controlled by superimposing a dither signal in an optical transmitter.
  • a general optical receiver uses only the intensity of the received optical signal as a cancellation condition for the optical signal loss alarm. For this reason, even if the received optical signal is an unmodulated optical signal or noise that does not contain data, the optical signal loss alarm is canceled when the intensity exceeds the alarm threshold. As a result, for example, a signal that does not include data is processed after the optical receiver, and abnormal data may be output from the optical receiver. That is, the general optical receiver has a problem that the reception state of the optical signal may not be appropriately determined. (Object of invention) An object of this invention is to provide the technique for determining suitably the reception state of an optical signal.
  • the optical receiver of the present invention is Detecting means for receiving an optical signal modulated by a data signal and detecting a frequency component of the signal superimposed on the optical signal; Photoelectric conversion means for converting the optical signal into an electrical signal and outputting the electrical signal; Control means for determining the content of the predetermined information based on a predetermined determination condition including a first condition relating to the detected frequency component; Is provided.
  • the optical receiving method of the present invention includes: Receiving an optical signal modulated by a data signal; Detecting the frequency component of the signal superimposed on the optical signal; Converting the optical signal into an electrical signal; Determining and determining the content of predetermined information based on a predetermined determination condition including a first condition relating to the detected frequency component; It is characterized by that.
  • the present invention provides an optical receiver and an optical reception method capable of suitably determining the reception state of an optical signal.
  • FIG. 3 is a block diagram illustrating a configuration example of a detection unit 101.
  • FIG. It is a block diagram which shows the structural example of the optical receiver 200 of 2nd Embodiment. It is a block diagram which shows the structural example of the optical transmission system 10 of 3rd Embodiment. It is a block diagram which shows the structural example of the optical receiver 300 of 3rd Embodiment. It is a flowchart which shows the example of the determination procedure of cancellation
  • FIG. 1 is a block diagram illustrating a configuration example of an optical receiver 100 according to the first embodiment of this invention.
  • the optical receiver 100 includes a detection unit 101, a photoelectric conversion unit 102, and a control unit 103.
  • the detection unit 101 serves as a detection unit that receives an optical signal that is modulated by a data signal and on which a signal having a predetermined frequency is superimposed, and that detects a frequency component of the superimposed signal.
  • the photoelectric conversion unit 102 serves as a photoelectric conversion unit that converts an optical signal into an electrical signal and outputs the electrical signal.
  • the photoelectric conversion unit 102 may include a general configuration of a digital coherent receiver (coherent detection unit, photodiode, transimpedance amplifier).
  • a signal (frequency signal) indicating a frequency component included in the optical signal is input from the detection unit 101 to the control unit 103.
  • the control part 103 can know the detected frequency component, the aspect of a frequency signal is arbitrary.
  • the control unit 103 determines the reception state of the optical signal based on the detected frequency component. For example, the control unit 103 determines that a desired optical signal is received when the detected frequency component includes a predetermined frequency. As a result, the optical receiver 100 can suitably determine the reception state of the optical signal.
  • the control unit 103 may output an optical signal loss alarm (LOS) based on the determination result of the optical signal reception state. Further, the control unit 103 may include a predetermined frequency table corresponding to a desired optical signal, and determine whether or not the detected frequency component is a signal based on the predetermined frequency with reference to the table. That is, the control unit 103 determines the content of the predetermined information based on a predetermined determination condition including the first condition regarding the detected frequency component.
  • LOS optical signal loss alarm
  • FIG. 2 is a block diagram illustrating a configuration example of the detection unit 101.
  • the detection unit 101 includes a coupler 111, a light receiving element 112, and an extraction circuit 113.
  • the coupler 111 branches a part of the optical signal input to the optical receiver 100 and outputs it to the light receiving element 112. The remainder of the input optical signal is output to the photoelectric conversion unit 102.
  • the light receiving element 112 is, for example, a photodiode, and converts the optical signal branched by the coupler 111 into an electrical signal.
  • the light receiving element 112 is a relatively low-speed light receiver.
  • the extraction circuit 113 detects the frequency component of the signal superimposed on the optical signal based on the AC component of the electrical signal output from the light receiving element 112.
  • the extraction circuit 113 outputs a signal (frequency signal) indicating the detected frequency component to the control unit 103.
  • the frequency component of the signal superimposed on the optical signal may be based on a dither signal superimposed on the optical signal for bias control of the optical modulator on the optical signal transmission side.
  • the functions of the detection unit 101 and the photoelectric conversion unit 102 may be controlled by the control unit 103.
  • FIG. 3 is a block diagram illustrating a configuration example of the optical receiver 200 according to the second embodiment of this invention.
  • the optical receiver 200 includes a detection unit 101A, a photoelectric conversion unit 102, and a control unit 103.
  • the configuration of the detection unit 101A is basically the same as that of the detection unit 101 of the first embodiment.
  • the light receiving element 112 and the extraction circuit 113 included in the detection unit 101A detect the intensity of the optical signal in addition to the frequency component of the signal superimposed on the optical signal.
  • the configuration and function of the photoelectric conversion unit 102 are the same as those in the first embodiment.
  • the control unit 103 receives a signal (frequency signal) indicating a frequency component included in the optical signal and a signal (optical intensity signal) indicating the intensity of the optical signal from the detection unit 101A.
  • a signal optical intensity signal
  • the detection unit 101A may generate a light intensity signal based on the magnitude of the DC component of the electrical signal generated by the light receiving element 112.
  • the control unit 103 receives the frequency signal and the optical intensity signal from the detection unit 101A, and determines the reception state of the optical signal based on the frequency component and the intensity of the optical signal included in the optical signal.
  • the control unit 103 determines that a desired optical signal is received when the frequency component included in the optical signal has a predetermined frequency and the intensity of the optical signal is equal to or greater than a predetermined threshold.
  • the optical receiver 200 can suitably determine the reception state of the optical signal.
  • the control unit 103 may output an optical signal loss alarm (LOS) based on the determination result of the optical signal reception state.
  • the control unit 103 may include a table of predetermined frequencies and predetermined thresholds corresponding to a desired optical signal, and determine the reception state of the optical signal with reference to the table.
  • the optical receiver 200 determines the reception state based on the frequency component included in the optical signal and the light intensity of the optical signal, thereby comparing the reception state with the optical receiver 100 according to the first embodiment. Can be more suitably determined. For example, when the optical receiver 200 receives an optical signal that includes a predetermined frequency component but has a low intensity and is difficult to demodulate a data signal, the control unit 103 detects an optical signal loss alarm based only on the presence or absence of the frequency component. Can be prevented from being released inappropriately.
  • FIG. 4 is a block diagram illustrating a configuration example of the optical transmission system 10 according to the third embodiment of this invention.
  • the optical transmission system 10 includes an optical transmitter 310 and an optical receiver 300.
  • the optical transmission line 320 connects the optical transmitter 310 and the optical receiver 300.
  • the optical transmitter 310 includes an optical modulator 301 that modulates continuous light, a control circuit 302 that outputs to the optical modulator 301 a data signal that is data for modulating continuous light and a dither signal that is used to control the optical modulator. Is provided.
  • the data signal is a digital signal transmitted by the optical transmission system 10.
  • the data signal is input to the control circuit 302 from the outside of the optical transmitter 310.
  • the optical modulator 301 sends an optical signal modulated with the data signal to the optical transmission line 320.
  • An optical fiber can be used as the optical transmission line 320.
  • the optical modulator 301 is generally composed of an optical waveguide.
  • a technique for superimposing a dither signal on a modulated optical signal for controlling the optical modulator 301 is known.
  • the dither signal is a low-frequency signal having a frequency F0 that is sufficiently slower than the data signal.
  • the amplitude of the dither signal is set so as not to affect the quality of the data signal.
  • the optical signal output from the optical modulator 301 is sent to the optical transmission line 320 with the dither signal superimposed. Therefore, the optical receiver 200 receives the optical signal on which the dither signal is superimposed.
  • the AC component when the output of an optical modulator on which a dither signal is superimposed is detected by a light receiver, the AC component includes a frequency F0 of the dither signal or a frequency 2F0 that is twice that frequency.
  • the optical transmitter can optimally adjust the bias voltage of the optical modulator by controlling the bias voltage of the optical modulator 301 so that the frequency of 2F0 is detected by the light receiver.
  • the optical receiver 300 determines whether the received light includes the F0 or 2F0 frequency based on the frequency of the dither signal as one of the conditions for issuing and canceling the optical signal loss alarm. Use.
  • the optical receiver 300 demodulates the data signal from the optical signal (received light) received from the optical transmission path 320.
  • the optical receiver 300 issues an optical signal loss alarm when it is not determined that the received light is detected, and cancels the optical signal loss alarm when it is determined that the received light is detected.
  • FIG. 5 is a block diagram illustrating a configuration example of the optical receiver 300.
  • the optical receiver 300 receives an optical signal using digital coherent technology.
  • the optical receiver 300 includes a detection unit (Detector, DET) 201, an optical reception circuit 210, and a control unit 203.
  • the detection unit 201 has the same configuration as the detection unit 101A of the second embodiment. That is, the detection unit 201 outputs a signal (frequency signal) indicating a frequency component included in the received light and a signal (light intensity signal) indicating the intensity of the received light to the control unit 203.
  • the optical receiving circuit 210 includes a photoelectric conversion unit 202, a laser diode (LD) 204, and a signal processing unit 205.
  • the laser diode 204 is a local oscillator for coherent detection.
  • the photoelectric conversion unit 202 is an integrated optical receiving circuit, and coherently detects the received light and converts it into an analog data signal.
  • the photoelectric conversion unit 202 is also called a coherent receiver (Integrated Coherent Receiver, ICR).
  • the photoelectric conversion unit 202 includes a 90-degree optical hybrid (HYB) 221, a light receiving element (PD) 222, and an amplifier (TIA) 223.
  • the 90-degree optical hybrid 221 causes the light from the laser diode 204 to interfere with the optical signal input from the detection unit 201, and outputs a beat signal to the light receiving element 222.
  • the 90-degree optical hybrid 221 is also called a coherent detection unit.
  • the light receiving element 222 converts the beat signal into a photocurrent.
  • the amplifier 223 converts the photocurrent input from the light receiving element 222 into a voltage, and outputs an analog data signal.
  • the amplifier 223 is also called a trans-impedance amplifier (Trans-ImpedanceedAmplifier).
  • the analog data signal is output to the control unit 203 and the signal processing unit 205.
  • the configurations and functions of the 90-degree optical hybrid 221, the light receiving element 222, and the amplifier 223 are well known, and details of these configurations are not directly related to the present invention, and thus detailed description thereof is omitted.
  • the signal processing unit 205 includes an analog-to-digital converter (Analog to Digital Converter, ADC) 251 and a digital signal processor (Digital Signal Processor, DSP) 252.
  • the analog-digital converter 251 converts the analog data signal input from the photoelectric conversion unit 202 into a digital signal.
  • the digital signal processor 252 performs dispersion compensation processing and decoding processing on the digital signal input from the analog-digital converter 251, and demodulates and outputs the digital data signal.
  • the digital data signal is a data signal input to the optical transmitter 310. Since the dispersion compensation process and the decoding process in the digital signal processor 252 are general processes performed by a digital coherent optical receiver, detailed description thereof is omitted.
  • control unit 203 determines that the received light is not normally received, the control unit 203 issues an optical signal loss alarm. In the following, the conditions for canceling the optical signal loss alarm being issued will be described.
  • the detection unit 201 outputs a frequency signal indicating the frequency component of the received light and a light intensity signal indicating the intensity of the received light.
  • a frequency signal and a light intensity signal are input to the control unit 203.
  • the control unit 203 detects the intensity of received light from the light intensity signal. If the intensity of the received light is equal to or greater than a predetermined threshold (first threshold), the control unit 203 determines that the condition for canceling the optical signal loss alarm is satisfied with respect to the intensity of the received light.
  • the first threshold is, for example, ⁇ 18 dBm.
  • the control unit 203 detects the presence or absence of the dither signal superimposed by the optical transmitter 310 based on the frequency signal.
  • the detection unit 201 detects a frequency (2F0) twice the dither signal. Therefore, the frequency signal also includes information that a frequency (2F0) twice that of the dither signal has been detected. If the frequency signal indicates that the frequency signal includes 2F0, the control unit 203 determines that the optical signal modulated by the optical transmitter 310 is received. Note that when the bias voltage of the optical modulator 301 is not optimized, the frequency signal includes the frequency (F0) of the dither signal. Therefore, the control unit 203 may determine that the received light is a signal modulated by the optical transmitter 310 if the frequency signal includes the frequency of F0.
  • the control unit 203 detects the amplitude of the analog data signal from the amplitude of the AC component of the analog data signal at the input of the analog-digital converter 251.
  • the amplitude of the analog data signal may be either an average value or a peak-to-peak value. If the amplitude of the analog data signal is equal to or greater than a predetermined threshold (second threshold), the control unit 203 determines that the condition for canceling the optical signal loss alarm is satisfied with respect to the amplitude of the analog data signal.
  • the second threshold is, for example, 500 mVppd (differential peak-to-peak, differential amplitude).
  • the control unit 203 cancels the optical signal loss alarm.
  • the control unit 203 does not cancel the optical signal loss alarm.
  • FIG. 6 is a flowchart showing an example of a determination procedure for canceling the optical signal loss alarm.
  • the control unit 203 issues an optical signal loss alarm.
  • the control unit 203 receives a light intensity signal and a frequency signal from the detection unit 201 (step S02). If the light intensity signal indicates that the intensity of the received light is less than the first threshold (step S03: No), the control unit 203 determines that the received light is not normally received, and an optical signal loss alarm Is not canceled (step S09). If the light intensity signal indicates that the intensity of the received light is greater than or equal to the first threshold (step S03: Yes), the control unit 203 extracts the frequency included in the frequency signal (step S04).
  • step S05: No If the frequency signal does not include the 2F0 frequency (step S05: No), the control unit 203 does not cancel the optical signal loss alarm (step S09).
  • the control unit 203 detects the amplitude of the analog data signal at the input of the analog-digital converter 251 (step S06). As described above, it may be determined in step S05 whether the dither signal includes the frequency F0.
  • step S07: No If the amplitude of the analog data signal is less than the second threshold value (step S07: No), the control unit 203 does not cancel the optical signal loss alarm (step S09). If the amplitude of the analog data signal is greater than or equal to the second threshold (step S07: Yes), the control unit 203 determines that the received light is being received normally, and cancels the optical signal loss alarm (step S08). .
  • control unit 203 may always receive the light intensity signal, the frequency signal, and the analog data signal.
  • the control unit 203 continues to issue an optical signal loss alarm based on the intensity of the received light, the amplitude of the analog data signal, and the frequency component (that is, the dither signal) of the signal superimposed on the received light. Or cancel.
  • the control unit 203 can determine that the received light is an optical signal modulated by the optical transmitter 310. That is, the optical receiver 300 can appropriately determine the reception state of the optical signal, and can cancel the optical signal loss alarm when the optical receiver 300 receives the modulated light.
  • the optical receiver 300 also determines the reception state of the optical signal using the intensity of the received light and the amplitude of the analog data signal. For this reason, it can suppress that the optical signal loss warning is cancelled
  • the cancellation condition of the optical signal loss alarm may be defined only by the amplitude of the analog data signal input to the analog-digital converter 251.
  • an optical transmitter and an optical receiver are arranged on the same plane in order to conform to the specifications of CFP2 (CFP: C-Form-factor Pluggable), which is a standard of MSA (Multi-Source Agreement).
  • CFP2 C-Form-factor Pluggable
  • MSA Multi-Source Agreement
  • the optical receiver 300 of the present embodiment determines the reception state of the optical signal based on the intensity of the received light and the presence or absence of the dither signal in addition to the amplitude of the analog data signal. For this reason, the optical receiver 300 of this embodiment can determine suitably the reception state of an optical signal. Specifically, the optical receiver 300 can suppress erroneous cancellation of the optical signal loss alarm even when the amplitude of the analog data signal increases due to signal interference or signal wraparound.
  • the optical receiver 300 described in the third embodiment receives a wavelength division multiplexing (WDM) optical signal.
  • the configuration of the optical receiver 400 shown in FIG. 7 is the same as that of the third embodiment, but the processing in the control unit 203 is different.
  • the control unit 203 selects the wavelength of the laser diode 204 from the received WDM optical signal so that one optical carrier wave having a desired wavelength including the data signal to be received is received.
  • the detection unit 201 Since the WDM optical signal includes a plurality of optical carriers, the detection unit 201 outputs an optical intensity signal indicating the total intensity of all the optical carriers included in the WDM optical signal. For this reason, when the optical receiver 400 is receiving a WDM optical signal, it is impossible to know the intensity of an optical carrier wave having a desired wavelength from the optical intensity signal output from the detection unit 201. On the other hand, when the low-frequency signal having the frequency F0 is superimposed only on the optical carrier wave of the desired wavelength, the optical carrier wave of the desired wavelength is received by detecting the frequency 2F0 or F0 from the frequency signal. Can be determined. Therefore, in the present embodiment, the control unit 203 determines the reception state of the optical signal based on the frequency signal output from the detection unit 201 and the amplitude of the analog data signal input to the analog-digital converter 251.
  • FIG. 8 is a flowchart showing an example of a determination procedure for canceling the optical signal loss alarm in the present embodiment.
  • step S03 which determines whether the intensity
  • Other procedures are the same as those in FIG.
  • the execution order of steps S05 and S07 may be switched. Moreover, these procedures may be processed in parallel.
  • FIG. 9 is a block diagram illustrating a configuration example of the optical receiver 500 according to the fifth embodiment.
  • a detection unit (TAP) 205 is placed outside the optical reception circuit 210 in place of the detection unit 201. It is different in point.
  • the detection unit 205 is a relatively low-speed light receiver that branches a part of the received light, receives one of the light by a light receiving element, and outputs a light intensity signal indicating the intensity of the received light.
  • the detection unit 205 is also called a tap PD.
  • the other of the branched received light is output to the photoelectric conversion unit 202.
  • the detection unit 205 may have a wavelength selection function.
  • a detection unit 205 having a wavelength selection function outputs a frequency signal and an optical intensity signal of an optical carrier wave having a selected wavelength.
  • the detection unit 205 having a wavelength selection function is realized by, for example, transmitting the branched received light through a wavelength variable filter that can control the transmission wavelength from the outside and receiving the light with a light receiving element.
  • the detection unit 205 can notify the control unit 203 of the intensity of the optical carrier wave of the desired wavelength and the frequency of the dither signal as the light intensity signal and the frequency signal. Therefore, in this case, the optical receiver 500 can cancel or continue the optical signal loss alarm by the procedure based on FIG. 6 of the third embodiment. That is, the detection unit 205 selects an optical carrier wave having a desired wavelength from the WDM optical signal according to an instruction from the control unit 203, and outputs a light intensity signal and a frequency signal to the control unit 203.
  • the control unit 203 obtains the intensity of the optical carrier wave having a desired wavelength from the light intensity signal received from the detection unit 205, and examines the frequency included in the dither signal from the frequency signal (steps S02 to S05 in FIG. 6). Further, the control unit 203 obtains the amplitude of the analog data signal at the input of the analog / digital converter 251 (steps S06 to S07 in FIG. 6). The determination procedure for canceling or continuing the optical signal loss alarm is the same as in FIG.
  • the optical receiver 500 can cancel or continue the optical signal loss alarm according to the procedure of FIG. 8 of the fourth embodiment. That is, the detection unit 205 outputs a frequency signal indicating a frequency component included in the WDM optical signal to the control unit 203.
  • the control unit 203 checks whether or not the frequency signal input from the detection unit 205 includes a frequency (2F0 or F0) corresponding to the dither signal superimposed on the optical carrier wave having a desired wavelength (step S04 in FIG. 8). -S05). Further, the control unit 203 obtains the amplitude of the analog data signal at the input of the analog / digital converter 251 (steps S06 to S07 in FIG. 8).
  • the determination procedure for canceling or continuing the optical signal loss alarm is the same as in FIG.
  • the optical receiver 500 can appropriately determine the reception state of the optical signal and issue and cancel the optical signal loss alarm.
  • the functions and procedures described in the above embodiments may be realized by executing a program by a central processing device (Central Processing Unit, CPU) included in the optical receivers 100, 200, 300, 400, and 500. .
  • the program is recorded on a fixed, non-temporary recording medium.
  • a semiconductor memory or a fixed magnetic disk device is used, but is not limited thereto.
  • the CPU is a computer provided in the control unit 103 or 203, for example, but may be provided in the digital signal processor 252.
  • Appendix 1 Detecting means for receiving an optical signal modulated by a data signal and detecting a frequency component of the signal superimposed on the optical signal; Photoelectric conversion means for converting the optical signal into an electrical signal and outputting the electrical signal; Control means for determining the content of the predetermined information based on a predetermined determination condition including a first condition relating to the detected frequency component; An optical receiver.
  • Appendix 2 The optical receiver according to appendix 1, wherein the control means includes, as the first condition, that the frequency component includes any one of a predetermined frequency and a frequency twice as high as the predetermined frequency.
  • the optical receiver according to appendix 2 wherein the predetermined frequency is a frequency of a dither signal superimposed on an amplitude of the optical signal when the optical signal is transmitted.
  • the detection means further detects the light intensity of the optical signal, The optical receiver according to any one of appendices 1 to 3, wherein the control unit includes the determination condition that the light intensity is equal to or higher than a first threshold value.
  • the photoelectric conversion means outputs the data signal demodulated from the optical signal to the control means, The optical receiver according to any one of appendices 1 to 3, wherein the control means includes, in the determination condition, that an amplitude of the data signal is equal to or greater than a second threshold value.
  • the detection means further detects the light intensity of the optical signal,
  • the control means includes If the determination condition is not satisfied, an alarm indicating that the optical signal is off is issued, Canceling the alarm when the determination condition is satisfied, The optical receiver according to any one of appendices 1 to 7.
  • An optical transmitter that outputs an optical signal modulated by a data signal and a dither signal having a predetermined frequency to an optical transmission line;
  • An optical transmission system comprising: the optical receiver according to any one of appendices 1 to 8 that receives the optical signal from the optical transmission path.
  • Appendix 10 Receiving an optical signal modulated by a data signal; Detecting the frequency component of the signal superimposed on the optical signal; Converting the optical signal into an electrical signal; Determining the content of predetermined information based on a predetermined determination condition including a first condition relating to the detected frequency component; Optical reception method.
  • Appendix 11 The optical reception method according to appendix 10, wherein the first condition includes that the frequency component includes any one of a predetermined frequency and a frequency twice as high as the predetermined frequency.
  • Appendix 12 The optical reception method according to appendix 11, wherein the predetermined frequency is a frequency of a dither signal superimposed on an amplitude of the optical signal when the optical signal is transmitted.
  • Appendix 13 further, Detecting the light intensity of the optical signal; The optical reception method according to any one of appendices 10 to 12, wherein the determination condition includes that the light intensity is equal to or greater than a first threshold value.
  • Optical transmission system 100 200, 300, 400, 500 Optical receiver 101, 101A, 201 Detection unit 102, 202 Photoelectric conversion unit 103, 203 Control unit 111 Coupler 112 Light receiving element 113 Extraction circuit 200 Optical receiver 204 Laser diode ( LD) 205 Detection part (TAP) 210 Optical receiver circuit 221 90-degree optical hybrid 222 Light receiving element (PD) 223 Amplifier (TIA) 251 Analog-to-digital converter (ADC) 252 Digital signal processor (DSP) 301 Optical modulator 302 Control circuit 310 Optical transmitter 320 Optical transmission line

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Abstract

L'invention concerne un récepteur optique, afin de déterminer de manière appropriée l'état de réception d'un signal optique, qui comprend : une unité de détection qui reçoit un signal optique modulé par un signal de données et détecte une composante de fréquence d'un signal superposé sur le signal optique ; une unité de conversion photoélectrique qui convertit le signal optique en un signal électrique et délivre en sortie celui-ci ; et une unité de commande qui détermine le contenu d'informations prescrites sur la base de conditions de détermination prescrites comprenant une première condition relative à la composante de fréquence détectée.
PCT/JP2019/007791 2018-03-02 2019-02-28 Récepteur optique et procédé de réception optique WO2019168092A1 (fr)

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