WO2023174165A1 - 相干接收装置、相干发送装置和相干通信*** - Google Patents
相干接收装置、相干发送装置和相干通信*** Download PDFInfo
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- WO2023174165A1 WO2023174165A1 PCT/CN2023/080680 CN2023080680W WO2023174165A1 WO 2023174165 A1 WO2023174165 A1 WO 2023174165A1 CN 2023080680 W CN2023080680 W CN 2023080680W WO 2023174165 A1 WO2023174165 A1 WO 2023174165A1
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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
- H04B10/25—Arrangements specific to fibre transmission
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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
- H04B10/50—Transmitters
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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
Definitions
- the present application relates to the technical field of coherent optical communications, and in particular to a coherent receiving device, a coherent transmitting device and a coherent communication system.
- coherent transmission technology During the signal transmission process, the spectral efficiency of coherent transmission technology is higher than that of other transmission methods. Especially in the case of long distance and high data rate, coherent transmission technology can not only maintain excellent transmission performance but also overcome the problems caused by high-speed signal transmission. Severe loss, therefore coherent transmission technology is widely used in submarine cables, long-distance backbones and metropolitan area transmission networks. Moreover, among coherent transmission technologies, homologous coherent technology has the advantages of low power consumption and low cost, making it widely used in the field of signal transmission. When using homologous coherent technology for signal transmission, the polarization state of the local oscillator light directly affects the quality of coherent reception, so how to track and control the polarization state of the local oscillator light is crucial.
- the present application provides a coherent receiving device, a coherent transmitting device and a coherent communication system, which can realize dual-wavelength coherent communication and can track and control local oscillator light.
- this application provides a coherent receiving device.
- the coherent receiving device includes: a polarization control module and a data receiving module; the polarization control module is used to receive a first local oscillation light, and the first local oscillation light includes The first light beam and the second light beam whose polarization states are orthogonal to each other, the wavelength of the first light beam is the first wavelength, and the wavelength of the second light beam is the second wavelength; by controlling the polarization state of the first local oscillation light, The first local oscillator light is divided into the first light beam and the second light beam; the data receiving module is used to receive the first signal light, the first signal light includes a third light beam modulated with data and a third light beam modulated with data.
- the wavelength of the third beam is the first wavelength
- the wavelength of the fourth beam is the second wavelength; use the first beam to acquire the modulated data on the third beam, and use the second beam to acquire the third beam. Modulated data on four beams.
- the polarization control module can separate the local oscillator light of two wavelengths by controlling the polarization state.
- the data receiving module uses the local oscillator light of two wavelengths to receive and modulate the signal light of the two wavelengths respectively. The data. In this way, coherent communication of wavelengths can be achieved, and the local oscillator light can be tracked and controlled, making the quality of coherent reception relatively high.
- the polarization control module is used to: divide the first local oscillation light into two beams; and perform phase modulation processing on the two beams, so that the two beams after the phase modulation processing are respectively the first beam and the second beam.
- phase modulation processing can be used to separate the local oscillator light of two wavelengths.
- the polarization control module includes a first polarization splitter rotator, PSR) and a control unit;
- the first PSR is used to receive the first local oscillation light and divide the first local oscillation light into two beams;
- the control unit is used to perform phase modulation processing on the two beams , output two beams after phase modulation processing to the data receiving module; extract feedback information from at least one beam after phase modulation processing; based on the feedback information, adjust the phase modulation voltage for phase modulation processing, so that after phase modulation processing
- the two beams are respectively the first beam and the second beam.
- the phase modulation voltage of the phase modulation process is controlled through feedback information, so that the first beam and the second beam can be separated more quickly and accurately.
- control unit includes N phase modulation units, a feedback extraction unit and a first processing module, where N is greater than or equal to 1; the N phase modulation units are used to output two The two light beams undergo phase modulation processing, and the two light beams after the phase modulation processing are output to the data receiving module; the feedback extraction unit is used to extract feedback information from at least one light beam after the phase modulation processing; the first processing module is used for , based on the feedback information, adjust the phase modulation voltage of at least one phase modulation unit among the N phase modulation units so that the two light beams after phase modulation processing are the first light beam and the second light beam respectively.
- the phase modulation voltage of the phase modulation process is controlled through feedback information, so that the first beam and the second beam are separated more quickly and accurately.
- control unit includes a first 2 ⁇ 2 optical coupler, N phase modulation units, a feedback extraction unit and a first processing module, and N is greater than or equal to 1.
- the first 2 ⁇ 2 optical coupler is used to receive the two light beams output by the first PSR, adjust the rotation angles of the polarization states of the two light beams, and output the two light beams.
- the N phase modulation units are used to adjust the 2 ⁇ 2.
- the two beams output by the optical coupler are subjected to phase modulation processing;
- the feedback extraction unit is used to extract feedback information from at least one beam after the phase modulation processing, and output the two beams after the phase modulation processing to the data receiving module ;
- the first processing module is used to adjust the phase modulation voltage of at least one of the N phase modulation units based on the feedback information, so that the two light beams after phase modulation processing are the first light beam and the third light beam respectively. Two beams.
- the 1st to Nth phase modulation units among the N phase modulation units are arranged sequentially along the local oscillator light transmission direction, and N is greater than 1; each phase modulation unit includes a phase modulator and 2 ⁇ 2 optical coupler; the input port and the output port of the phase modulator in the first phase modulation unit are respectively connected with an output port of the first PSR and the first port of the 2 ⁇ 2 optical coupler in the first phase modulation unit.
- One input port is connected; the second input port of the 2 ⁇ 2 optical coupler in the first phase modulation unit is connected to another output port of the first PSR; the 2 ⁇ 2 optical coupler in the i-1th phase modulation unit is connected
- the two output ports of the device are respectively connected to the input port of the phase modulator in the i-th phase modulation unit and the first input port of the 2 ⁇ 2 optical coupler; the output of the phase modulator in the i-1th phase modulation unit
- the port is connected to the second input port of the 2 ⁇ 2 optical coupler, i is greater than 1 and less than or equal to N; the two output ports of the 2 ⁇ 2 optical coupler in the Nth phase modulation unit are respectively connected to the feedback extraction unit Connected; the first processing module is used to adjust the phase modulation voltage of the phase modulator in the at least one phase modulation unit based on the feedback information.
- the phase modulation unit is implemented by a phase modulator and a 2 ⁇ 2 optical coupler.
- the phase modulation voltage of the phase modulator By adjusting the phase modulation voltage of the phase modulator, the first beam and the second beam are separated more quickly and accurately.
- the feedback extraction unit includes a first 1 ⁇ 2 optical splitter, a second 1 ⁇ 2 optical splitter and a sub-extraction unit; the N phase modulation units are used to respectively provide the first 1 ⁇ 2 optical splitter with The second beam splitter and the second 1 ⁇ 2 optical splitter output the two light beams after phase modulation processing.
- the first 1 ⁇ 2 optical splitter is used to divide a light beam after phase modulation processing into a first sub-beam and a second sub-beam, and output them to the data receiving module and the sub-extraction unit respectively;
- the second 1 ⁇ 2 splitter The device is used to divide the other beam after phase modulation processing into the third sub-beam and the fourth sub-beam, and output them to the data receiving module and the sub-extraction unit respectively;
- the sub-extraction unit is used to determine the target power, the target The power includes the sum of the powers of the light of the second wavelength in the second sub-beam and the light of the first wavelength in the fourth sub-beam, or includes the sum of the power of the light of the second wavelength in the second sub-beam.
- the power of the light of the first wavelength in the fourth sub-beam; the first processing module is used to adjust the phase modulation voltage of the at least one phase modulation unit on the principle of adjusting the target power to a minimum value, so that the third The wavelength of one sub-beam is the first wavelength, and the wavelength of the third sub-beam is the second wavelength.
- the power of the light of the second wavelength in the output optical path of the first beam is the smallest, and the power of the light of the first wavelength in the output optical path of the second beam is the smallest, so that in the output optical path of the first beam
- the light of the second wavelength is not included, and the light of the first wavelength is not included in the output optical path of the second light beam. Therefore, the first light beam and the second light beam can be separated and output.
- the feedback extraction unit includes a first 1 ⁇ 2 optical splitter and a sub-extraction unit; N phase modulation units are used to output phase modulation to the first 1 ⁇ 2 optical splitter and the data receiving module respectively.
- the first 1 ⁇ 2 optical splitter is used to divide a light beam after phase modulation processing into a first sub-beam and a second sub-beam, and output them to the data receiving module and the sub-extraction unit respectively;
- the sub-extraction unit is used to, Determine the power of the light of the second wavelength in the second sub-beam;
- the first processing module is used to adjust the phase modulation voltage of the at least one phase modulation unit on the principle of adjusting the power to a minimum value, so that the The wavelength of the first sub-beam is the first wavelength.
- the power of the light of the second wavelength in the output optical path of the first beam is determined to be the minimum, so that the output optical path of the first beam does not include the light of the second wavelength, then the output optical path of the second beam also does not include the light of the second wavelength. Since the light of the first wavelength is not included, the first light beam and the second light beam can be separated and output.
- the polarization state of the third light beam modulated with data is an orthogonal polarization state
- the polarization state of the fourth light beam modulated with data is an orthogonal polarization state
- the data receiving module includes a second PSR, a third A demultiplexing module, a second demultiplexing module, a coherent receiving unit and a second processing module
- the second PSR is used to receive the first signal light and divide the first signal light into a first sub-signal light and a second sub-signal light.
- the first wavelength splitting module is used to divide the first sub-signal light into the signal light of the first wavelength and the signal light of the second wavelength
- the second wavelength splitting module is used to divide the first sub-signal light into the signal light of the second wavelength.
- the two sub-signal lights are divided into the signal light of the first wavelength and the signal light of the second wavelength
- the coherent receiving unit is used to use the first beam to coherently receive the signal light of the first wavelength to obtain the first
- the second beam is used to coherently receive the signal light of the second wavelength to obtain the second result
- the second processing module is used to obtain the third beam based on the first result and the second result. and modulated data on the fourth beam.
- the application provides a coherent sending device, which includes a light source, a polarization changing module and a data sending module; the light source is used to output a first beam, a second beam, a third beam and a fourth beam.
- the wavelength of the first beam and the third beam is the first wavelength
- the wavelength of the second beam and the fourth beam is the second wavelength
- the polarization changing module is used to convert the first beam and the second beam Combined into a beam of first local oscillation light with mutually orthogonal polarization states, the first local oscillation light is output
- the data sending module is used to modulate data onto the third beam and the fourth beam to obtain the first signal light, and output the first signal light.
- the polarization states of the first beam and the second beam are adjusted to be orthogonal before being transmitted, so that the coherent receiving device can separate the first beam and the second beam.
- the data sending module includes a processing module, a first modulator, a second modulator, a first combining module, a second combining module and a PSR; the processing module is used to provide the data;
- the first modulator is used to divide the third beam into a first sub-beam and a second sub-beam, and modulate the data onto the first sub-beam and the second sub-beam respectively;
- the second modulator is used to The fourth beam is divided into a third sub-beam and a fourth sub-beam, and data is modulated onto the third sub-beam and the fourth sub-beam respectively;
- the first multiplexing module is used to combine the third sub-beam modulated with data.
- One sub-beam and the third sub-beam modulated with data are combined into a first sub-signal light; the second multiplexing module is used to combine the second sub-beam modulated with data and the fourth sub-beam modulated with data.
- the PSR is used to adjust the polarization state of the first sub-signal light to a polarization state orthogonal to the polarization state of the second sub-signal light, and merge the first sub-signal light after adjusting the polarization state.
- the signal light and the second sub-signal light are used to obtain the first signal light. In this way, a data transmission module that implements dual-wavelength coherent transmission is provided.
- the present application provides a coherent communication system, which includes coherent A sending device and a coherent receiving device.
- the coherent sending device includes a light source, a polarization changing module and a data sending module.
- the coherent receiving device includes a polarization control module and a data receiving module; the light source is used to output a first light beam, a second light beam, and a third light beam.
- the wavelength of the first beam and the third beam is the first wavelength
- the wavelength of the second beam and the fourth beam is the second wavelength
- the polarization changing module is used to convert the first beam and the second light beam are combined into a first local oscillator light whose polarization states are orthogonal to each other, and the first local oscillator light is output
- the data sending module is used to modulate data to the third light beam and the fourth light beam.
- the polarization control module is used to receive the first local oscillation light; and by controlling the polarization state of the first local oscillation light, separate the first local oscillation light into The first beam and the second beam;
- the data receiving module is used to receive the fourth beam; use the first beam to obtain the modulated data on the third beam, and use the second beam to obtain the modulated data on the fourth beam. modulated data.
- the coherent transmission device adjusts the polarization states of the dual-wavelength local oscillation light to be orthogonal before transmitting, and transmits data through the dual-wavelength signal light.
- the coherent receiving device can separate the local oscillator light of two wavelengths by controlling the polarization state, and uses the local oscillator light of the two wavelengths to receive data modulated on the signal light of the two wavelengths respectively. In this way, dual-wavelength coherent communication can be achieved, and the local oscillator light can be tracked and controlled, making the quality of coherent communication relatively high.
- the polarization control module is used to: divide the first local oscillation light into two beams; and perform phase modulation processing on the two beams, so that the two beams after the phase modulation processing are respectively the first beam and the second beam.
- the polarization control module includes a first PSR and a control unit; the first PSR is used to receive the first local oscillation light and divide the first local oscillation light into two beams; the control unit Used to perform phase modulation processing on the two light beams, and output the two light beams after the phase modulation processing to the data receiving module; extract feedback information from at least one light beam after the phase modulation processing; based on the feedback information, adjust the modulation
- the phase modulation voltage of the phase processing is such that the two light beams after the phase modulation processing are the first light beam and the second light beam respectively.
- control unit includes N phase modulation units, a feedback extraction unit and a first processing module, where N is greater than or equal to 1; the N phase modulation units are used to output two The two light beams undergo phase modulation processing, and the two light beams after the phase modulation processing are output to the data receiving module; the feedback extraction unit is used to extract feedback information from at least one light beam after the phase modulation processing; the first processing module is used for , based on the feedback information, adjust the phase modulation voltage of at least one phase modulation unit among the N phase modulation units, so that the two light beams after phase modulation processing are the first light beam and the second light beam respectively.
- the feedback extraction unit includes a first 1 ⁇ 2 optical splitter, a second 1 ⁇ 2 optical splitter and a sub-extraction unit; N phase modulation units are used to respectively provide the first 1 ⁇ 2 optical splitter with and the second 1 ⁇ 2 optical splitter outputs two light beams after phase modulation processing.
- the first 1 ⁇ 2 optical splitter is used to divide a light beam after phase modulation processing into a first sub-beam and a second sub-beam, and output them to the data receiving module and the sub-extraction unit respectively;
- the second 1 ⁇ 2 splitter The device is used to divide the other beam after phase modulation processing into the third sub-beam and the fourth sub-beam, and output them to the data receiving module and the sub-extraction unit respectively;
- the sub-extraction unit is used to determine the target power, the target The power includes the sum of the powers of the light of the second wavelength in the second sub-beam and the light of the first wavelength in the fourth sub-beam, or includes the sum of the power of the light of the second wavelength in the second sub-beam.
- the power of the light of the first wavelength in the fourth sub-beam; the first processing module is used to adjust the phase modulation voltage of the at least one phase modulation unit on the principle of adjusting the target power to a minimum value, so that the third The wavelength of one sub-beam is the first wavelength, and the wavelength of the third sub-beam is the second wavelength.
- the feedback extraction unit includes a first 1 ⁇ 2 optical splitter and a sub-extraction unit; N phase modulation units are used to output phase modulation to the first 1 ⁇ 2 optical splitter and the data receiving module respectively.
- the first 1 ⁇ 2 optical splitter is used to divide a light beam after phase modulation processing into a first sub-beam and a second sub-beam, and output them to the data receiving module and the sub-extraction unit respectively;
- the sub-extraction unit is used to, Determine the power of the light of the second wavelength in the second sub-beam;
- the first processing module is used to adjust the phase modulation voltage of the at least one phase modulation unit on the principle of adjusting the power to a minimum value, so that the The wavelength of the first sub-beam is the first wavelength.
- the present application provides a coherent communication system, including a coherent sending device and a coherent receiving device connected through optical fibers;
- the coherent sending device includes a light source, a first sending module, a second sending module, a first connection module and a third Two connection modules;
- the coherent receiving device includes a third connection module, a fourth connection module, a first polarization control module, a second polarization control module, a first receiving module and a second receiving module;
- the light source is used to send light to the first
- the connection module outputs the first beam and the second beam respectively, and outputs the third beam and the fourth beam to the first sending module and the second sending module respectively;
- the wavelength of the first beam and the third beam is the first wavelength,
- the wavelengths of the second light beam and the fourth light beam are the second wavelength;
- the first connection module is used to output the first light beam and the second light beam respectively;
- the first sending module is used to modulate the data to the third light beam.
- the first signal light is obtained, and the first signal light is output to the second connection module; the second sending module is used to modulate the data onto the fourth light beam, obtain the second signal light, and output it to the third light beam.
- the second connection module outputs the second signal light; the second connection module is used to output the first signal light and the second signal light respectively; the third connection module is used to receive the first light beam and the second light beam.
- the first polarization control module is used to control the first component and the second component of the first beam The power difference is less than or equal to the reference value;
- the second polarization control module is used to control the power difference between the first component and the second component of the second light beam to be less than or equal to the reference value;
- the fourth connection module is used to, Receive the first signal light and the second signal light, send the first signal light to the first receiving module, and send the second signal light to the second receiving module;
- the first receiving module is used to convert the The first signal light is divided into two sub-signal lights, and the first component and the second component of the first light beam are used to respectively obtain the modulated data on the two sub-signal lights of the first signal light;
- the second receiving module is used to The second signal light is divided into two sub-signal lights, and the first component and the second component of the second light beam are used to respectively obtain data modulated on the two sub-signal lights of the first signal light;
- the coherent sending device sends dual-wavelength local oscillator light and sends data through dual-wavelength signal light.
- the coherent receiving device uses two polarization control modules to control the local oscillator light of dual wavelengths respectively, so that the local oscillator light of each wavelength can be separated into a first component and a second component, and the power of the first component and the second component is close to each other. Or equal.
- the first component is used to receive a sub-signal light in the first signal light (the sub-signal light is in the first polarization state when received by the coherent receiving device), and the second component is used to receive There is another sub-signal light in the first signal light (the other sub-signal light is in the second polarization state when received by the coherent receiving device), and the first polarization state is orthogonal to the second polarization state.
- the first component is used to receive one sub-signal light of the second signal light
- the second component is used to receive another sub-signal light of the first signal light. In this way, since the power of the first component and the second component are close to or equal, the signal light of each orthogonal polarization state can be received.
- the first polarization control module is used to: divide the first beam into two sub-beams; perform phase modulation processing on the two sub-beams, so that the power difference between the two sub-beams after the phase modulation processing is The value is less than or equal to the reference value, and the two sub-beams after phase modulation processing are the first component and the second component respectively.
- phase modulation processing can be used to make the power of the first component and the second component of the first light beam close to each other.
- the first polarization control module includes a first PSR and a control unit; the first PSR is used to receive the first beam and divide the first beam into two sub-beams; the control unit is used to , perform phase modulation processing on the two sub-beams, and output the two sub-beams after the phase modulation processing to the first receiving module; extract feedback information from at least one sub-beam after the phase modulation processing; based on the feedback information, adjust the modulation
- the phase modulation voltage of the phase processing is such that the power difference of the two sub-beams after the phase modulation processing is less than or equal to the reference value.
- the phase modulation voltage of the phase modulation process is controlled through feedback information, so that the power of the first component and the second component of the first light beam are close to each other.
- control unit includes M phase modulation units, a feedback extraction unit and a first processing module, N is greater than or equal to 1; the M phase modulation units are used to perform phase modulation processing on the two sub-beams output by the first PSR, and output the two sub-beams after phase modulation processing to the first receiving module; the feedback extraction unit is used to extract feedback information from at least one sub-beam after phase modulation processing; the first processing module is used to adjust the phase modulation voltage of at least one of the M phase modulation units based on the feedback information, so that The power difference of the two sub-beams after phase modulation processing is less than or equal to the reference value.
- the phase modulation voltage of the phase modulation process is controlled through feedback information, so that the power of the first component and the second component of the first light beam are close to each other.
- the 1st to Mth phase modulation units among the M phase modulation units are arranged sequentially along the local oscillator light transmission direction, and M is greater than 1; each phase modulation unit includes a phase modulator and 2 ⁇ 2 optical coupler; the input port and the output port of the phase modulator in the first phase modulation unit are respectively connected with an output port of the first PSR and the first port of the 2 ⁇ 2 optical coupler in the first phase modulation unit.
- One input port is connected; the second input port of the 2 ⁇ 2 optical coupler in the first phase modulation unit is connected to another output port of the first PSR; the 2 ⁇ 2 optical coupler in the i-1th phase modulation unit is connected
- the two output ports of the device are respectively connected to the input port of the phase modulator in the i-th phase modulation unit and the first input port of the 2 ⁇ 2 optical coupler; the output of the phase modulator in the i-1th phase modulation unit
- the port is connected to the second input port of the 2 ⁇ 2 optical coupler, i is greater than 1 and less than or equal to M; the two output ports of the 2 ⁇ 2 optical coupler in the Mth phase modulation unit are respectively connected to the feedback extraction unit ;
- the first processing module is used to adjust the phase modulation voltage of the phase modulator in the at least one phase modulation unit based on the feedback information.
- the phase modulation unit is implemented by a phase modulator and a 2 ⁇ 2 optical coupler.
- the phase modulation voltage of the phase modulator By adjusting the phase modulation voltage of the phase modulator, the power of the first component and the second component of the first light beam are close to each other. .
- the feedback extraction unit includes a first 1 ⁇ 2 optical splitter, a second 1 ⁇ 2 optical splitter and a sub-extraction unit; the M phase modulation units are used to respectively provide the first 1 ⁇ 2 optical splitter with The second 1 ⁇ 2 optical splitter outputs two sub-beams after phase modulation processing.
- the first 1 ⁇ 2 optical splitter is used to divide a light beam after phase modulation processing into a first sub-beam and a second sub-beam, and output them to the first receiving module and the sub-extraction unit respectively;
- the second 1 ⁇ 2 The spectrometer is used to divide the other sub-beam after phase modulation processing into a third sub-beam and a fourth sub-beam, and output them to the first receiving module and the sub-extraction unit respectively;
- the sub-extraction unit is used to determine the first sub-beam.
- the first power includes the difference between the power of the second sub-beam and the fourth sub-beam, or includes the power of the second sub-beam and the power of the fourth sub-beam; the first processing module is used to,
- the phase modulation voltage of the at least one phase modulation unit is adjusted based on the principle of adjusting the power difference between the power of the second sub-beam and the power of the fourth sub-beam to be less than or equal to the reference value.
- the power difference between the first component and the second component is determined to be the smallest, so that the power of the first component and the second component of the first light beam are close to each other.
- the feedback extraction unit includes a first 1 ⁇ 2 optical splitter and a sub-extraction unit; M phase modulation units are used to output modulation to the first 1 ⁇ 2 optical splitter and the first receiving module respectively.
- Two sub-beams after phase processing The first 1 ⁇ 2 optical splitter is used to divide a sub-beam after phase modulation processing into a first sub-beam and a second sub-beam, and output them to the first receiving module and the sub-extraction unit respectively; the sub-extraction unit uses To determine the power of the second sub-beam; the first processing module is used to adjust the phase modulation voltage of the at least one phase modulation unit based on the principle of adjusting the power of the second sub-beam to a target value.
- the power of the second sub-beam is the target value, which means that the power of the second sub-beam is equal to the power of the first sub-beam. Therefore, by controlling the power of the second sub-beam to the target value, the first sub-beam can be made The power of the first component and the second component of the beam are similar.
- the first receiving module includes a second PSR, a first coherent receiving unit and a second processing module;
- the second PSR is used to divide the first signal light into first sub-signal light and the second sub-signal light;
- the first coherent receiving unit configured to use the first component of the first light beam to coherently receive the first sub-signal light to obtain the first result;
- the second component of the first light beam to coherently receive the second sub-signal light to obtain a second result;
- the second processing module is used to obtain the first result based on the first result and the second result. Data modulated on signal light.
- the second receiving module includes a sixth PSR, a second coherent receiving unit and a sixth processing module;
- the sixth PSR is used to divide the second signal light into a third sub-signal light and The fourth sub-signal light;
- the second coherent receiving unit is used to use the first component of the second light beam to coherently receive the third sub-signal light to obtain a third result; and use the second component of the first light beam. component, perform coherent reception on the fourth sub-signal light, and obtain a fourth result;
- the sixth processing module is configured to obtain modulated data on the second signal light based on the third result and the fourth result. In this way, a receiving module for coherent reception is provided.
- Figure 1 is a schematic structural diagram of a coherent transmission device provided by an exemplary embodiment of the present application.
- Figure 2 is a schematic structural diagram of a coherent transmission device provided by an exemplary embodiment of the present application.
- Figure 3 is a schematic structural diagram of a coherent transmission device provided by an exemplary embodiment of the present application.
- Figure 4 is a schematic structural diagram of a data receiving module provided by an exemplary embodiment of the present application.
- Figure 5 is a schematic structural diagram of a coherent receiving device provided by an exemplary embodiment of the present application.
- Figure 6 is a schematic structural diagram of a coherent receiving device provided by an exemplary embodiment of the present application.
- Figure 7 is a schematic structural diagram of a polarization control module provided by an exemplary embodiment of the present application.
- Figure 8 is a schematic structural diagram of a polarization control module provided by an exemplary embodiment of the present application.
- Figure 9 is a schematic structural diagram of a coherent receiving device provided by an exemplary embodiment of the present application.
- Figure 10 is a schematic structural diagram of a coherent receiving device provided by an exemplary embodiment of the present application.
- Figure 11 is a schematic structural diagram of a coherent receiving device provided by an exemplary embodiment of the present application.
- Figure 12 is a schematic structural diagram of a coherent communication device provided by an exemplary embodiment of the present application.
- Figure 13 is a schematic structural diagram of a coherent communication system provided by an exemplary embodiment of the present application.
- Figure 14 is a schematic structural diagram of a coherent communication system provided by an exemplary embodiment of the present application.
- Figure 15 is a schematic structural diagram of a coherent communication device provided by an exemplary embodiment of the present application.
- Figure 16 is a schematic structural diagram of the first sending module provided by an exemplary embodiment of the present application.
- Figure 17 is a schematic structural diagram of a second sending module provided by an exemplary embodiment of the present application.
- Figure 18 is a schematic structural diagram of the first polarization control module provided by an exemplary embodiment of the present application.
- Figure 19 is a schematic structural diagram of the first polarization control module provided by an exemplary embodiment of the present application.
- Figure 20 is a schematic structural diagram of the first polarization control module provided by an exemplary embodiment of the present application.
- Figure 21 is a schematic structural diagram of a first receiving module provided by an exemplary embodiment of the present application.
- Figure 22 is a schematic structural diagram of a second polarization control module provided by an exemplary embodiment of the present application.
- Figure 23 is a schematic structural diagram of a second receiving module provided by an exemplary embodiment of the present application.
- Figure 24 is a schematic structural diagram of a coherent communication device provided by an exemplary embodiment of the present application.
- Figure 25 is a schematic structural diagram of a coherent communication system provided by an exemplary embodiment of the present application.
- the first sub-light source 1221.
- the first 1 ⁇ 2 beam splitter 012.
- the second sub-light source 1222.
- the second 1 ⁇ 2 beam splitter
- Processing module 031. First modulator; 032. Second modulator; 033. First combining module; 034. Second combining module; 035. PSR;
- Polarization control module 2. Data receiving module; 11. First PSR; 12. Control unit; 121. Phase modulation unit; 122. Feedback extraction unit; 123. First processing module; 1211. Phase modulator; 1222. 2 ⁇ 2 optocoupler;
- Second PSR 22. First wave splitting module; 23. Second wave splitting module; 24. Coherent receiving unit; 25. Second processing module;
- the first sub-coherent receiving unit 242.
- the second sub-coherent receiving unit
- Target polarization control module 0002.
- First data receiving module
- the third processing module 101.
- the third processing module 201.
- the fourth processing module 202.
- the first coherent receiving unit 801. The fifth PSR; 802. The first control unit; 8021.
- the fifth processing module 8021.
- the second coherent receiving unit 103.
- the sixth processing module 1001.
- the third polarization control module 002.
- the fourth polarization control module 003.
- the third receiving module 004.
- the fourth receiving module 001.
- Coherent light refers to light with a definite frequency and phase.
- the coherent light may be laser light generated by a laser with spatial superposition and mutual interference characteristics.
- the coherent communication system is an optical fiber communication system, which can also be called a coherent optical communication system or a coherent optical transmission system.
- Coherent communication systems use multi-dimensional parameters such as phase, frequency, and amplitude of coherent light to carry more modulation information to make full use of fiber bandwidth and achieve ultra-high-capacity data transmission.
- the light emitted by the laser in the coherent transmitting device is divided into two paths, one path loads data to the modulator, and the signal light after loading the data is transmitted to the coherent receiving device through one path of light, and the other path The light is simultaneously transmitted to the coherent receiving device as local oscillator light through another optical fiber.
- the coherent receiving device and the coherent transmitting device can be applied in various network scenarios.
- it can be used in scenarios such as backbone optical transmission networks, optical access networks, data center interconnections, short-distance optical interconnections, and wireless service fronthaul or backhaul.
- the coherent receiving device may correspond to receiving side equipment of different networks, or a system including receiving side equipment.
- the coherent transmitting device may correspond to transmitting side devices of different networks, or a system including transmitting side devices.
- Coherent communication systems may correspond to communication devices of different networks.
- the embodiments of the present application are applied to homologous dual-wavelength coherent communication systems.
- the following describes the case of using one polarization control module to control the polarization states of two wavelengths.
- coherent transmitting device coherent receiving device
- coherent communication equipment coherent communication equipment
- Figure 1 provides a schematic structural diagram of a coherent transmission device.
- the coherent sending device includes a light source 01, a polarization changing module 02 and a data sending module 03.
- the light source 01 can provide a first beam, a second beam, a third beam and a fourth beam.
- the wavelength of the first beam and the third beam is the first wavelength ( ⁇ 1 )
- the wavelength of the second beam and the fourth beam is The second wavelength ( ⁇ 2 ).
- the first light beam ( ⁇ 1LO ) and the second light beam ( ⁇ 2LO ) are used as local oscillator lights
- the third light beam ( ⁇ 1s ) and the fourth light beam ( ⁇ 2s ) are used as light carrying data.
- the light source 01 outputs the first light beam and the second light beam to the polarization changing module 02 , and outputs the third light beam and the fourth light beam to the data sending module 03 .
- the polarization changing module 02 converts the polarization state of the first beam into another polarization state that is orthogonal to the polarization state of the second beam, and combines the converted first beam and the second beam into one beam, The first local oscillation light is obtained, and the first local oscillation light is output to the coherent receiving device.
- the polarization changing module 02 converts the polarization state of the second beam into a polarization state orthogonal to the polarization state of the first beam, and combines the converted second beam and the first beam into one beam to obtain the first local light. , output the first local oscillator light to the coherent receiving device.
- the polarization state of the first beam in the first local oscillation light is a transverse electric (TE) mode polarization state.
- the TE mode polarization state may be called a TE mode polarization mode or an X polarization state.
- the polarization state of the second beam is The state is the transverse magnetic (TM) mode polarization state, and the TM mode polarization state can also be called the TM polarization mode or Y polarization state.
- TM transverse magnetic
- the data sending module 03 receives the third beam and the fourth beam, modulates the data onto the third beam and the fourth beam, and obtains the first signal light.
- the first signal light includes the third beam modulated with data and the third beam modulated with data. Four beams.
- the data sending module 03 outputs the first signal light to the coherent receiving device.
- the polarization changing module 02 may be a PSR or other module capable of realizing polarization conversion, which is not limited by the embodiments of this application.
- Figure 2 provides a schematic structural diagram of a light source.
- the light source 01 includes a first sub-light source 011 , a first 1 ⁇ 2 beam splitter 1221 , a second sub-light source 012 and a second 1 ⁇ 2 beam splitter 1222 .
- the first sub-light source 011 may be a laser of a first wavelength, used to provide light of the first wavelength, and the first sub-light source 011 outputs the light of the first wavelength to the first 1 ⁇ 2 optical splitter 1221 .
- the first 1 ⁇ 2 beam splitter 1221 divides the light of the first wavelength into two beams of light. The two beams of light are respectively the first beam and the third beam. The powers of the first beam and the third beam may be equal or unequal.
- the first 1 ⁇ 2 optical splitter 1221 outputs the first light beam to the polarization changing module 02 and outputs the third light beam to the modulator in the data sending module 03 .
- the second sub-light source 012 may be a laser of a second wavelength for providing light of the second wavelength, and the second sub-light source 012 outputs the light of the second wavelength to the second 1 ⁇ 2 optical splitter 1222 .
- the second 1 ⁇ 2 beam splitter 1222 divides the light of the second wavelength into two beams of light. The two beams of light are respectively the second beam and the fourth beam. The powers of the second beam and the fourth beam may be equal or unequal.
- the second 1 ⁇ 2 beam splitter 1222 outputs the second beam to the polarization changing module 02 and outputs the fourth beam to the modulator of the data sending module 03 .
- Figure 3 provides a schematic structural diagram of a coherent transmission device.
- the data sending module 03 includes a processing module 030, a first modulator 031, a second modulator 032, a first multiplexing module 033, a second multiplexing module 034 and a PSR035.
- the processing module 030 sends data to the first modulator 031 and the second modulator 032 respectively, and the data sent respectively may be different data or the same data.
- the first modulator 031 receives the third beam, divides the third beam into a first sub-beam and a second sub-beam, modulates the data to the first sub-beam and the second sub-beam respectively, and the first sub-beam and the second sub-beam.
- the data modulated on the path beams can be the same or different.
- the first modulator 031 outputs a first beamlet modulated with data to the first multiplexing module 033 , and outputs a second beamlet modulated with data to the second multiplexing module 034 .
- the power of the first sub-beam and the second sub-beam may be equal or unequal.
- the second modulator 032 receives the fourth beam, divides the fourth beam into a third sub-beam and a fourth sub-beam, and adjusts the data to the third sub-beam and the fourth sub-beam respectively, and the third sub-beam and the fourth sub-beam.
- the data modulated on the path beams can be the same or different.
- the second modulator 032 outputs the third sub-beam modulated with data to the first multiplexing module 033 , and outputs the fourth sub-beam modulated with data to the second multiplexing module 034 .
- the power of the third sub-beam and the fourth sub-beam may be equal or unequal.
- the first combining module 033 combines the first sub-beam modulated with data and the third sub-beam modulated with data into one beam to obtain the first sub-signal light, and outputs the first sub-signal light to PSR035.
- the second combining module 034 combines the third sub-beam modulated with data and the fourth sub-beam modulated with data into one beam to obtain the second sub-signal light, and outputs the second sub-signal light to the PSR035.
- PSR035 rotates the polarization state of the first sub-signal light to be orthogonal to the polarization state of the second sub-signal light, and combines the adjusted first sub-signal light and the second sub-signal light into one beam to obtain the first signal light .
- the polarization states of the first sub-beam modulated with data are orthogonal to the second sub-beam modulated with data
- the polarization states of the third sub-beam modulated with data are orthogonal to the fourth sub-beam modulated with data.
- Figure 4 provides a schematic structural diagram of the data sending module 03.
- the processing module 030 includes a first digital signal processor (digital signal process, DSP), a digital analog converter (digital analog converter, DAC) and a driver circuit.
- DSP digital signal process
- DAC digital analog converter
- the first DSP is used to provide digital signals of data and transmit them to the DAC.
- DAC is used to convert digital signals into analog signals and transmit them to the driver circuit.
- the driving circuit is used to convert analog signals into electrical signals and transmit them to the first modulator 031 and the second modulator 032 .
- the first modulator 031, the second modulator 032, the first multiplexing module 033, the second multiplexing module 034 and the PSR035 can be implemented by a silicon optical chip, because the silicon optical chip can transmit TE mode polarization mode light. , so the first sub-signal light and the second sub-signal light are both in the TE mode polarization mode before being output from the PSR035. After the first sub-signal light passes through the PSR035, the polarization state is rotated to the TM mode polarization mode, and the second sub-signal light passes through the PSR035. The back polarization state is also the TE mode polarization mode.
- Figure 5 provides a schematic structural diagram of a coherent receiving device.
- the coherent receiving device includes a polarization control module 1 and a data receiving module 2.
- An optical communication connection is established between the polarization control module 1 and the data receiving module 2.
- part of the structure in the data receiving module 2 and the polarization control module 1 are implemented through a silicon optical chip, and the polarization control module 1 and the data receiving module 2 are implemented through an optical waveguide. Implement communication connections.
- the polarization control module 1 receives the first local oscillation light sent by the coherent transmission device.
- the first local oscillation light includes a first light beam and a second light beam whose polarization states are orthogonal to each other.
- the polarization control module 1 is capable of controlling the polarization state of the first local oscillation light, and by controlling the polarization state of the first local oscillation light, the first local oscillation light is separated into a first light beam and a second light beam.
- the polarization control module 1 outputs the first light beam and the second light beam to the data receiving module 2 .
- the data receiving module 2 receives the first signal light sent by the coherent sending device.
- the first signal light includes a third light beam modulated with data and a fourth light beam modulated with data.
- the wavelength of the third light beam is the same as the wavelength of the first light beam, and both are the first wavelength.
- the wavelength of the fourth light beam is the same as the wavelength of the second light beam, and both are the second wavelength.
- the data receiving module 2 separates the first signal light into a third light beam modulated with data and a fourth light beam modulated with data.
- the data receiving module 2 uses the first light beam to obtain modulated data on the third light beam, and uses the second light beam to obtain modulated data on the fourth light beam.
- the polarization states of the first beam and the second beam will change, so in the first local oscillator light received by the coherent receiving device, although the third The polarization state of one beam is orthogonal to that of the second beam, but may no longer be TE mode polarization mode and TM mode polarization mode.
- the polarization control module 1 can divide the first local oscillation light into two beams, and perform phase modulation processing on the two beams, so that the two beams after the phase modulation processing are respectively the first beam and the second beam. , to achieve the separation of local oscillator light of two wavelengths.
- the polarization control module 1 changes the local oscillation light of two wavelengths in the first local oscillation light into the TE mode polarization mode and the TM mode polarization mode respectively, and then uses a polarization beam splitter to separate the two The local oscillator light of the wavelength is separated.
- the polarization control module 1 includes a first PSR 11 and a control unit 12 , see FIG. 6 .
- the first PSR11 receives the first local oscillation light and divides the first local oscillation light into two light beams.
- the control unit 12 performs phase modulation processing on the two light beams, that is, adjusts the phases of the two light beams, extracts feedback information from at least one light beam after the phase modulation processing, the feedback information may be optical power, etc., and sends it to the data receiving module. 2 Output the two beams after phase modulation processing.
- the control unit 12 uses the feedback information to adjust the phase modulation voltage for phase modulation processing, and uses the adjusted phase modulation voltage to make the two light beams after the phase modulation processing be the first light beam and the second light beam respectively.
- the phase modulation voltage here is the voltage for adjusting the phase.
- the first PSR11 is implemented by a silicon optical chip, and the polarization states of the first local oscillation light divided into two beams are both TE mode polarization states.
- FIG. 7 provides a schematic structural diagram of the polarization control module 1.
- the control unit 12 includes N phase modulation units 121, feedback extraction units 122 and first processing modules 123.
- N is greater than or equal to 1.
- N takes the value 3.
- the N phase modulation units 121 perform phase modulation processing on the two light beams output by the first PSR11 and output the two phase modulation processed light beams to the data receiving module 2 .
- the feedback extraction unit 122 extracts feedback information from at least one light beam after phase modulation processing.
- the first processing module 123 uses the feedback information to determine the phase modulation voltage of at least one phase modulation unit 121, and uses the adjusted phase modulation voltage to control the phase modulation unit 121, so that the two light beams after phase modulation processing are respectively the first light beam and the first light beam. Second beam.
- the control unit 12 includes a first 2 ⁇ 2 optical coupler, N phase modulation units 121, a feedback extraction unit 122 and a first processing module 123, where N is greater than or equal to 1.
- the first 2 ⁇ 2 optical coupler is used to receive the two light beams output by the first PSR11, adjust the rotation angles of the polarization states of the two light beams, and output the two light beams.
- the N phase modulation units 121 perform phase modulation processing on the two light beams output by the first 2 ⁇ 2 optical coupler, and output the two phase modulated light beams to the data receiving module 2 .
- the feedback extraction unit 122 extracts feedback information from at least one light beam after phase modulation processing.
- the first processing module 123 adjusts the phase modulation voltage of at least one of the N phase modulation units 121 based on the feedback information, so that the two light beams after phase modulation processing are the first light beam and the second light beam respectively. beam.
- the phase modulation unit 121 includes a phase modulator 1211 and a 2 ⁇ 2 optical coupler 1212.
- Phase modulator 1211 is used to change the phase of the input beam.
- the 2 ⁇ 2 optical coupler 1212 is used to couple the two input light beams and then separate them into two light beams.
- the 2 ⁇ 2 optical coupler 1212 may be a multi-mode interference coupler (MMI).
- the input port of the phase modulator 1211 is connected to the first output port of the first PSR11.
- the first output port is a port that outputs a light beam.
- the output port of the phase modulator 1211 is connected to the first input port of the 2 ⁇ 2 optical coupler 1212. .
- the second output port of the first PSR11 is connected to the second input port of the 2 ⁇ 2 optical coupler 1212, and the second output port is a port that outputs another light beam.
- Two output ports of the 2 ⁇ 2 optical coupler 1212 are connected to the feedback extraction unit 122 , or one output port is connected to the feedback extraction unit 122 and the other is connected to the data receiving module 2 .
- FIG. 8 provides a schematic structural diagram of the polarization control module 1.
- the input port of the phase modulator 1211 in the first phase modulation unit 121 is connected to the first output port of the first PSR11 ,Should
- the output port of the phase modulator 1211 is connected to the first input port of the 2 ⁇ 2 optical coupler 1212 in the first phase modulation unit 121 .
- the second input port of the 2 ⁇ 2 optical coupler 1212 is connected to the second output port of the first PSR11.
- the two output ports of the 2 ⁇ 2 optical coupler 1212 in the i-1th phase modulation unit 121 are respectively connected to the input port of the phase modulator 1211 in the i-th phase modulation unit 121 and the first port of the 2 ⁇ 2 optical coupler 1212. Input port connection.
- the output port of the phase modulator 1211 in the i-1th phase modulation unit 121 is connected to the second input port of the 2 ⁇ 2 optical coupler 1212.
- i is greater than 1 and less than or equal to N.
- the Nth phase modulation unit 121 is the last phase modulation unit 121, and both output ports of the 2 ⁇ 2 optical coupler 1212 in the Nth phase modulation unit 121 are connected to the feedback extraction unit 122. Alternatively, the two output ports of the 2 ⁇ 2 optical coupler 1212 in the Nth phase modulation unit 121 are connected to the feedback extraction unit 122 and the data receiving module 2 respectively.
- the feedback extraction unit 122 extracts the feedback information and provides it to the first processing module 123 .
- the first processing module 123 adjusts the phase modulation voltage of the phase modulator 1211 in at least one phase modulation unit 121 based on the feedback information.
- phase modulation unit 121 The above is only one possible structure of the phase modulation unit 121. All forms of devices or module structures that can realize the phase modulation function can be applied to the embodiments of the present application, and the embodiments of the present application are not limited thereto.
- the phase modulator 1211 is used to adjust the phase of one light beam. In another implementation, the phase modulator 1211 can be used to adjust the phase of two light beams.
- the feedback extraction unit 122 includes a first 1 ⁇ 2 optical splitter 1221 , a second 1 ⁇ 2 optical splitter 1222 and a sub-extraction unit 1223 .
- the plurality of phase modulation units 121 output two beams after phase modulation processing, one beam is output to the first 1 ⁇ 2 beam splitter 1221, and the other beam is output to the second 1 ⁇ 2 beam splitter 1222.
- the first 1 ⁇ 2 optical splitter 1221 divides a received beam into a first sub-beam and a second sub-beam, and outputs them to the data receiving module 2 and the sub-extraction unit 1223 respectively.
- the second 1 ⁇ 2 optical splitter 1222 divides the received sub-beam into a third sub-beam and a fourth sub-beam, and outputs them to the data receiving module 2 and the sub-extraction unit 1223 respectively.
- the power of the first sub-beam is greater than the power of the second sub-beam
- the power of the third sub-beam is greater than the power of the fourth sub-beam.
- the sub-extraction unit 1223 filters out the light of the first wavelength, so that only the light of the second wavelength is extracted, and when receiving the fourth sub-beam, filters out the light of the second wavelength, so that only the light of the second wavelength is extracted.
- the first wavelength of light when receiving the second sub-beam, the sub-extraction unit 1223 filters out the light of the first wavelength, so that only the light of the second wavelength is extracted, and when receiving the fourth sub-beam, filters out the light of the second wavelength, so that only the light of the second wavelength is extracted.
- the first wavelength of light is the first wavelength of light.
- the sub-extraction unit 1223 detects the power of the light of the second wavelength in the second sub-beam, and detects the power of the light of the first wavelength in the fourth sub-beam, determines that the sum of the two powers is the target power, and reports it to the first processing module 123 Output the target power, or the sub-extraction unit 1223 outputs the power of the light of the second wavelength in the second sub-beam and the power of the light of the first wavelength in the fourth sub-beam to the first processing module 123, and the target power includes the two powers.
- the target power may also be the power of the light of the second wavelength in the second sub-beam or the power of the light of the first wavelength in the fourth sub-beam.
- the first processing module 123 adjusts the phase modulation voltage of at least one phase modulation unit 121 according to the principle of adjusting the target power to a minimum value. For example, the first processing module 123 may adjust the phase modulation voltage according to a preset step size.
- the target power includes the power of the light of the second wavelength in the second sub-beam and the power of the light of the first wavelength in the fourth sub-beam
- the target power being minimum means that both powers are minimum.
- FIG. 9 provides another structural schematic diagram of the polarization control module 1 .
- the feedback extraction unit 122 includes a first 1 ⁇ 2 optical splitter 1221 and a sub-extraction unit 1223 .
- the plurality of phase modulation units 121 output two light beams after phase modulation processing, one light beam is output to the first 1 ⁇ 2 optical splitter 1221 , and the other light beam is output to the data receiving module 2 .
- the first 1 ⁇ 2 optical splitter 1221 divides a received beam into a first sub-beam and a second sub-beam, and outputs them to the data receiving module 2 and the sub-extraction unit 1223 respectively. Wherein, the power of the first sub-beam is greater than the power of the second sub-beam.
- the sub-extraction unit 1223 When receiving the second sub-beam, the sub-extraction unit 1223 filters out the light of the first wavelength so that only the light of the second wavelength is extracted. The sub-extraction unit 1223 detects the power of the light of the second wavelength in the second sub-beam and outputs the power to the first processing module 123 . The first processing module 123 adjusts the phase modulation voltage of at least one phase modulation unit 121 based on the principle of adjusting the power to a minimum value.
- the feedback providing unit 122 may also include a second 1 ⁇ 2 optical splitter 1222 and a sub-extraction unit 1223.
- extracting feedback information please refer to the description of Figures 8 and 9, which will not be described again here.
- the sub-extraction unit 1223 includes a photodetector and an analog digital converter (ADC).
- the photodetector detects the target power, and the ADC converts the target power into an analog signal and sends the analog signal to the first processing module 123.
- the first processing module 123 determines the phase modulation voltage indication information, and sends the phase modulation voltage indication information to at least one phase modulation unit 121.
- the phase modulation voltage indication information may be sent in the form of an analog signal.
- the first processing module 123 may be a field programmable gate array (field programmable gate array, FPGA) or an application-specific integrated circuit (application-specific integrated circuit, ASCI), etc.
- FPGA field programmable gate array
- ASCI application-specific integrated circuit
- the polarization state of the third light beam modulated with data is an orthogonal polarization state
- the polarization state of the fourth light beam modulated with data is an orthogonal polarization state
- Figure 10 provides the structure of the coherent receiving device. Schematic diagram. Referring to FIG. 10 , the data receiving module 2 includes a second PSR 21 , a first demultiplexing module 22 , a second demultiplexing module 23 , a coherent receiving unit 24 and a second processing module 25 .
- the second PSR21 receives the first signal light and separates the first signal light into a first sub-signal light and a second sub-signal light.
- the first sub-signal light includes a third light beam modulated with data and a fourth light beam modulated with data.
- the second sub-signal light includes a third light beam modulated with data and a fourth light beam modulated with data.
- the first sub-signal light and the second sub-signal light are transmitted to the first demultiplexing module 22 and the second demultiplexing module 23 respectively.
- the first wavelength demultiplexing module 22 separates the signal light of the first wavelength and the signal light of the second wavelength in the first sub-signal light, and outputs the signal light of the first wavelength and the signal light of the second wavelength to the coherent receiving unit 24 .
- the second wavelength demultiplexing module 23 separates the signal light of the first wavelength and the signal light of the second wavelength in the second sub-signal light, and outputs the signal light of the first wavelength and the signal light of the second wavelength to the coherent receiving unit 24 .
- the coherent receiving unit 24 uses the first light beam to coherently receive the light of the first wavelength to obtain the first result, and uses the second light beam to coherently receive the light of the second wavelength to obtain the second result.
- the coherent receiving unit 24 outputs the first result and the second result to the second processing module 25 .
- the second processing module 25 uses the first result and the second result to obtain modulated data on the third beam and the fourth beam.
- the coherent receiving unit 24 includes a first sub-coherent receiving unit 241 and a second sub-coherent receiving unit 242 .
- the first sub-coherent receiving unit 241 includes a first optical splitter, two mixers and a first photoelectric conversion module.
- the first optical splitter divides the first light beam into two beams. One beam is used for mixing with the signal light of the first wavelength output by the first wavelength splitting module 22 in a mixer to output the mixed light. signal, and another beam is used to perform mixing processing with the signal light of the first wavelength output by the second demultiplexing module 23 in another mixer, and output a mixed optical signal.
- the processed optical signal is converted into an electrical signal to obtain a second result, and the second result is output to the second processing module 25 .
- the signal light of the first wavelength output by the first demultiplexing module 22 and the signal light of the first wavelength output by the second demultiplexing module 23 are two channels of signal light output by the first modulator 031 .
- the signal light is a first sub-beam modulated with data and a second sub-beam modulated with data.
- the signal light of the second wavelength output by the first demultiplexing module 22 and the signal light of the second wavelength output by the second demultiplexing module 23 are two channels of signal light output by the second modulator 032.
- the two channels of signal light are modulated.
- the third sub-beam of data and the fourth sub-beam modulated with data are modulated.
- the second processing module 25 includes a trans-impedance amplifier (trans-impedance amplifier, TIA), an ADC and a second DSP.
- TIA amplifies electrical signals.
- ADC converts the amplified electrical signal into a digital signal.
- the second DSP obtains modulated data on the third beam and the fourth beam according to the digital signal.
- the second PSR21 converts the TM mode polarization mode signal sent by the coherent transmitting device.
- the light is converted into signal light in the TE mode polarization mode, so that the first signal light can be transmitted inside the silicon optical chip.
- the first PSR11 converts the local oscillation light of the TM mode polarization mode sent by the coherent transmitting device into the local oscillation light of the TE mode polarization mode, so that the local oscillation light can be transmitted in the silicon Internal transmission of optical chips.
- the reason why the local oscillator light of the first wavelength and the local oscillator light of the second wavelength can be separated by the first PSR11 and the control unit 12 is: the local oscillator light of the first wavelength and the local oscillator light of the second wavelength.
- the phase modulator 1211 and the 2 ⁇ 2 optical coupler 1212 cooperate with each other to change the phase angle and rotation angle. Therefore, through the phase modulator 1211 and the 2 ⁇ 2 optical coupler 1212, the phase angle and the rotation angle will change.
- the coupler 1212 can restore the phase angle and rotation angle of the local oscillator light of the first wavelength, and can restore the phase angle and rotation angle of the local oscillator light of the second wavelength. Therefore, it can restore the phase angle and rotation angle of the local oscillator light of the first wavelength and the second wavelength.
- the two wavelengths of local oscillator light are separated.
- the coherent communication equipment includes the coherent receiving device described above, which means that the coherent communication equipment only has the coherent receiving function.
- the coherent communication equipment includes the coherent transmission device described above, indicating that the coherent communication equipment only has the coherent transmission function.
- the coherent communication device can not only send data to other coherent communication devices using the light of the first wavelength and the second wavelength, but also can receive data sent by other communication devices using the light of the third wavelength and the fourth wavelength, indicating that the coherent communication device It has both coherent sending and receiving functions.
- Figure 12 provides a schematic structural diagram of a coherent communication device.
- the coherent communication equipment includes a coherent receiving device, a coherent transmitting device, a connection module A for connecting to external communication optical fibers, and a connection module B for connecting to external communication optical fibers.
- the coherent sending device includes a light source 01, a polarization changing module 02 and a data sending module 03, and the coherent receiving device includes a target polarization control module 0001 and a first data receiving module 0002.
- the connection module A is connected to the polarization changing module 02 and the first data receiving module 0002 respectively
- the connection module B is connected to the data sending module 03 and the target polarization control module 0001 respectively.
- the light source 01 is used to output a first beam, a second beam, a third beam and a fourth beam.
- the first beam and the second beam are used as local oscillator light, and the third beam and the fourth beam are used as signal light.
- the wavelength of the first beam and the third beam is the first wavelength, and the wavelength of the second beam and the fourth beam is the second wavelength.
- the light source 01 outputs the first light beam and the second light beam to the polarization changing module 02 , and outputs the third light beam and the fourth light beam to the data sending module 03 .
- the polarization changing module 02 combines the first light beam and the second light beam into a first local oscillation light whose polarization states are orthogonal to each other, and outputs the first local oscillation light to the connection module A.
- the connection module A outputs the first local oscillator light to another coherent receiving device.
- the data sending module 03 receives the third beam and the fourth beam, modulates the data onto the third beam and the fourth beam, and obtains the first signal light.
- the first signal light includes the third beam modulated with data and the third beam modulated with data. Four beams.
- Data sending mode Block 03 outputs the first signal light to connection module B.
- the connection module B outputs the first signal light to another coherent communication device.
- the connection module B receives the local oscillation light A sent by another coherent communication device and outputs the local oscillation light A to the target polarization control module 0001.
- the local oscillation light A includes the fifth beam ( ⁇ 3LO ) and the sixth beam whose polarization states are orthogonal to each other.
- the beam ( ⁇ 4LO ), the fifth beam and the sixth beam are used as local oscillator lights.
- the target polarization control module 0001 can control the polarization state of the local oscillation light A, and by controlling the polarization state of the local oscillation light A, separate the local oscillation light A into a fifth beam and a sixth beam.
- the target polarization control module 0001 outputs the fifth beam and the sixth beam to the first data receiving module 0002.
- the connection module A receives the second signal light sent by another coherent communication device and outputs the second signal light to the first data receiving module 0002.
- the second signal light includes a seventh light beam ( ⁇ 3s ) modulated with data and a seventh light beam modulated with data.
- the wavelengths of the eighth beam ( ⁇ 4s ), the seventh beam and the fifth beam are the third wavelength ( ⁇ 3 ), and the wavelengths of the eighth beam and the sixth beam are the fourth wavelength ( ⁇ 4 ).
- the first data receiving module 0002 separates the second signal light into a seventh light beam modulated with data and an eighth light beam modulated with data.
- the first data receiving module 0002 uses the fifth light beam to obtain modulated data on the seventh light beam, and uses the sixth light beam to obtain modulated data on the eighth light beam.
- the coherent sending device in the coherent communication device uses the light of the first wavelength and the second wavelength to send data to another coherent communication device, and uses the light of the third wavelength and the fourth wavelength to receive the data sent by the other coherent communication device, These four wavelengths are not equal.
- the polarization states of the first beam and the second beam in the first local oscillation light are orthogonal to each other.
- the polarization state of the third light beam modulated with data in the first signal light is an orthogonal polarization state
- the polarization state of the fourth light beam modulated with data is an orthogonal polarization state.
- the polarization states of the fifth beam and the sixth beam in the local oscillation light A are orthogonal to each other.
- the polarization state of the seventh light beam modulated with data in the second signal light is an orthogonal polarization state
- the polarization state of the eighth light beam modulated with data is an orthogonal polarization state.
- Figure 13 provides a schematic structural diagram of a coherent communication system.
- the coherent communication system includes the coherent sending device described above and the coherent receiving device described above.
- the coherent sending device and the coherent receiving device are connected through a first optical fiber and a second optical fiber.
- the coherent sending device includes a light source 01, a polarization changing module 02 and a data sending module 03.
- the coherent receiving module includes a polarization control module 1 and a data receiving module 2.
- the light source 01 is used to output a first beam, a second beam, a third beam and a fourth beam.
- the first beam and the second beam are used as local oscillator light
- the third beam and the fourth beam are used as light carrying data.
- the wavelength of the first beam and the third beam is the first wavelength
- the wavelength of the second beam and the fourth beam is the second wavelength.
- the light source 01 outputs the first light beam and the second light beam to the polarization changing module 02 , and outputs the third light beam and the fourth light beam to the data sending module 03 .
- the polarization changing module 02 combines the first light beam and the second light beam into a first local oscillation light whose polarization states are orthogonal to each other, and outputs the first local oscillation light to the coherent receiving device through the connected first optical fiber.
- the data sending module 03 receives the third beam and the fourth beam, modulates the data onto the third beam and the fourth beam, and obtains the first signal light.
- the first signal light includes the third beam modulated with data and the third beam modulated with data. Four beams.
- the data sending module 03 outputs the first signal light to the coherent receiving device through the connected second optical fiber.
- the coherent receiving device includes a polarization control module 1 and a data receiving module 2 .
- An optical communication connection is established between the polarization control module 1 and the data receiving module 2 .
- the polarization control module 1 receives the first local oscillation light output from the coherent transmitting device.
- the first local oscillation light includes a first light beam and a second light beam whose polarization states are orthogonal to each other.
- the polarization control module 1 is capable of controlling the polarization state of the first local oscillation light, and by controlling the polarization state of the first local oscillation light, the first local oscillation light is separated into a first light beam and a second light beam.
- the polarization control module 1 outputs the first light beam and the second light beam to the data receiving module 2 .
- the data receiving module 2 receives the first signal light output by the coherent sending device.
- the first signal light includes a third signal modulated with data. Three beams and a fourth beam modulated with data.
- the data receiving module 2 separates the first signal light into a third light beam modulated with data and a fourth light beam modulated with data.
- the data receiving module 2 uses the first light beam to obtain modulated data on the third light beam, and uses the second light beam to obtain modulated data on the fourth light beam.
- FIG. 14 provides another structural schematic diagram of a coherent communication system.
- the coherent communication system includes the coherent communication device shown in FIG. 12 (referred to as coherent communication device A) and another coherent communication device (referred to as coherent communication device B).
- coherent communication device A the coherent communication device shown in FIG. 12
- coherent communication device B another coherent communication device
- the structure of the coherent communication device B is similar to the structure of the coherent communication device A, and will not be described again here.
- the coherent communication device A corresponds to the coherent communication device B, that is, the coherent communication device B uses the third wavelength and the fourth wavelength of light to send data to the coherent communication device A, and receives the coherent communication device A using the first wavelength and the second wavelength. Light sends data.
- the following describes the case of using a polarization control module to control the polarization state of one wavelength. Specifically, the description is performed in the order of coherent communication systems and coherent communication devices.
- Figure 15 provides a schematic structural diagram of a coherent communication system.
- a coherent communication system includes a coherent transmitting device and a coherent receiving device connected through optical fibers.
- the coherent transmission device includes a light source 01, a first transmission module 10, a second transmission module 20, a first connection module 30 and a second connection module 40.
- the coherent receiving device includes a third connection module 50 , a fourth connection module 60 , a first polarization control module 70 , a second polarization control module 80 , a first receiving module 90 and a second receiving module 100 .
- the light source 01 is used to output a first beam, a second beam, a third beam and a fourth beam.
- the first beam and the second beam are used as local oscillator light
- the third beam and the fourth beam are used as light carrying data.
- the wavelength of the first beam and the third beam is the first wavelength
- the wavelength of the second beam and the fourth beam is the second wavelength.
- the light source 01 outputs the first light beam and the second light beam to the first connection module 30 respectively.
- the light source 01 outputs the third light beam to the first sending module 10 and the fourth light beam to the second sending module 20 .
- the first connection module 30 outputs the first light beam and the second light beam respectively.
- the first light beam and the second light beam are output through an external optical fiber connected to the first connection module 30 .
- the first sending module 10 modulates the data onto the third light beam, obtains the first signal light, and outputs the first signal light to the second connection module 40 .
- the second sending module 20 modulates the data onto the fourth light beam, obtains the second signal light, and outputs the second signal light to the second connection module 40 .
- the second connection module 40 outputs the first signal light and the second signal light respectively.
- the first signal light and the second signal light are output through an external optical fiber connected by the second connection module 40 .
- the third connection module 50 receives the first light beam and the second light beam, outputs the first light beam to the first polarization control module 70 , and outputs the second light beam to the second polarization control module 80 .
- the first polarization control module 70 divides the first light beam into a first component and a second component, and controls the power difference between the first component and the second component to be less than or equal to a reference value, and the reference value is relatively small. For example, the power difference between the first component and the second component is 0.
- the fourth connection module 60 receives the first signal light and outputs the first signal light to the first receiving module 90 .
- the first receiving module 90 divides the first signal light into two sub-signal lights, and uses the first component and the second component of the first light beam to obtain the modulated data on the two sub-signal lights respectively.
- the second polarization control module 80 divides the second light beam into a first component and a second component, and controls the power difference between the first component and the second component to be less than or equal to the reference value, and the reference value is relatively small. For example, the power difference between the first component and the second component is 0.
- the fourth connection module 60 receives the second signal light and outputs the second signal light to the second receiving module 100 .
- the second receiving module 100 divides the second signal light into two sub-signal lights, and uses the first component and the second component of the second light beam to obtain the two sub-signals respectively. Sub-signal optically modulated data.
- two polarization control modules are used to control respectively.
- the power difference between the first component and the second component is relatively small, so that both sub-signal lights in the first signal light can be received. And both sub-signal lights of the second signal light can be received.
- FIG. 16 provides a schematic structural diagram of the first sending module 10.
- the first sending module 10 includes a third processing module 101, a first modulator 031 and a PSR035.
- the third processing module 101 sends data to the first modulator 031.
- the first modulator 031 receives the third beam, divides the third beam into a first sub-beam and a second sub-beam, and modulates the data onto the first sub-beam and the second sub-beam respectively.
- the first modulator 031 outputs the first sub-beam modulated with data and the second sub-beam modulated with data to the PSR035.
- the power of the first sub-beam and the second sub-beam may be equal or unequal.
- PSR035 rotates the polarization state of the first sub-beam modulated with data to a first polarization state that is orthogonal to the polarization state of the second sub-beam modulated with data, and combines the adjusted first sub-beam and The second sub-beam modulated with data is converted into one beam, and the first local oscillator light is obtained.
- the polarization states of the first sub-beam modulated with data and the second sub-beam modulated with data are orthogonal, and the data of the two polarization states can be transmitted in the optical fiber, making the utilization of the optical transmission channel relatively high.
- the third processing module 101 includes a first DSP, a DAC and a driving circuit.
- the first DSP provides the digital signal of data and transmits it to the DAC.
- DAC is used to convert digital signals into analog signals and transmit them to the driver circuit.
- the driving circuit is used to convert the analog signal into an electrical signal and transmit it to the first modulator 031 .
- FIG. 17 provides a schematic structural diagram of the second sending module 20.
- the second sending module 20 includes a fourth processing module 201, a second modulator 032 and a fourth PSR 202.
- the fourth processing module 201 sends data to the second modulator 032.
- the second modulator 032 receives the fourth beam, divides the fourth beam into a third sub-beam and a fourth sub-beam, and modulates the data onto the third sub-beam and the fourth sub-beam respectively.
- the second modulator 032 outputs the third sub-beam modulated with data and the fourth sub-beam modulated with data to the fourth PSR 202 .
- the power of the third sub-beam and the fourth sub-beam may be equal or unequal.
- the fourth PSR 202 rotates the polarization state of the third sub-beam modulated with data to the first polarization state.
- the polarization state of the fourth sub-beam modulated with data in the first polarization state is orthogonal, and merges the third sub-beam after adjusting the polarization state. and the fourth sub-beam modulated with data form one beam to obtain the second signal light.
- the polarization states of the third sub-beam modulated with data and the fourth sub-beam modulated with data are orthogonal, and the data of the two polarization states can be transmitted in the optical fiber, making the utilization rate of the optical transmission channel relatively high.
- the first polarization state may be a TM mode polarization mode
- a polarization state orthogonal to the first polarization state may be a TE mode polarization mode.
- the fourth processing module 201 includes a second DSP, a DAC and a driving circuit.
- the second DSP provides the digital signal of data and transmits it to the DAC.
- DAC is used to convert digital signals into analog signals and transmit them to the driver circuit.
- the driving circuit is used to convert the analog signal into an electrical signal and transmit it to the second modulator 032 .
- the polarization states of the third light beam modulated with data in the first signal light are orthogonal, and the first component of the first light beam is used to receive data of one polarization state of the third light beam modulated with data, that is, the third light beam is modulated with data.
- the second component is used to receive data of another polarization state of the third beam modulated with data, that is, data modulated on the second sub-beam.
- the polarization state of the fourth beam modulated with data in the second signal light is orthogonal, and the first component of the second beam is used to receive data of one polarization state of the fourth beam modulated with data, that is, the modulation on the third sub-beam
- the second component is used to receive data of another polarization state of the fourth beam modulated with data, that is, data modulated on the fourth sub-beam.
- the first polarization control module 70 divides the first beam into two sub-beams, and performs phase modulation processing on the two sub-beams, so that the power difference of the two sub-beams after the phase modulation processing is Less than or equal to the reference value.
- FIG. 18 provides a schematic structural diagram of the first polarization control module 70.
- the first polarization control mode Block 70 includes a first PSR11 which receives the first beam and splits it into two sub-beams and a control unit 12 .
- the control unit 12 performs phase modulation processing on the two sub-beams, that is, adjusts the phases of the two sub-beams, extracts feedback information from at least one sub-beam after the phase modulation processing, the feedback information may be optical power, etc., and sends it to the first
- the receiving module 90 outputs the two sub-beams after phase modulation processing.
- the control unit 12 uses the feedback information to adjust the phase modulation voltage for phase modulation processing, and uses the adjusted phase modulation voltage to control the power difference of the two sub-beams after the phase modulation processing to be less than or equal to the reference value.
- control unit 12 includes M phase modulation units 121, feedback extraction units 122 and first processing modules 123, where M is greater than or equal to 1.
- M takes the value 2.
- the M phase modulation units 121 perform phase modulation processing on the two sub-beams output by the first PSR11, and output the two sub-beams after phase modulation processing to the first receiving module 90.
- the feedback extraction unit 122 extracts feedback information from at least one sub-beam after phase modulation processing.
- the first processing module 123 uses the feedback information to determine the phase modulation voltage of at least one phase modulation unit 121, and uses the adjusted phase modulation voltage to control the phase modulation unit 121 so that the power difference of the two sub-beams after phase modulation processing is less than or Equal to the participation value.
- the control unit 12 includes a first 2 ⁇ 2 optical coupler, M phase modulation units 121, a feedback extraction unit 122 and a first processing module 123, where M is greater than or equal to 1.
- the first 2 ⁇ 2 optical coupler is used to receive the two sub-beams output by the first PSR11, adjust the rotation angles of the two sub-beams, and output the two sub-beams.
- the M phase modulation units 121 are used to couple the 2 ⁇ 2 light beams.
- the two sub-beams output by the receiver are subjected to phase modulation processing, and the two sub-beams after phase modulation processing are output to the first receiving module 90 .
- the feedback extraction unit 122 extracts feedback information from at least one sub-beam after phase modulation processing.
- FIG. 19 provides a schematic structural diagram of the first polarization control module 70.
- the feedback extraction unit 122 includes a first 1 ⁇ 2 optical splitter 1221 , a second 1 ⁇ 2 optical splitter 1222 and a sub-extraction unit 1223 .
- the plurality of phase modulation units 121 output two sub-beams after phase modulation processing, one sub-beam is output to the first 1 ⁇ 2 beam splitter 1221, and the other sub-beam is output to the second 1 ⁇ 2 beam splitter 1222.
- the first 1 ⁇ 2 optical splitter 1221 divides the received sub-beam into a first sub-beam and a second sub-beam, and outputs them to the first receiving module 90 and the sub-extraction unit 1223 respectively.
- the second 1 ⁇ 2 optical splitter 1222 divides the received sub-beam into a third sub-beam and a fourth sub-beam, and outputs them to the first receiving module 90 and the sub-extraction unit 1223 respectively.
- the power of the first sub-beam is greater than the power of the second sub-beam
- the power of the third sub-beam is greater than the power of the fourth sub-beam.
- the ratio of the power of the first sub-beam to the second sub-beam is equal to the power of the third sub-beam and the third sub-beam.
- the ratio of the powers of the four sub-beams are examples of the powers of the four sub-beams.
- the sub-extraction unit 1223 detects the power of the second sub-beam and the power of the fourth sub-beam, calculates the power difference between the second sub-beam and the fourth sub-beam, and outputs the power difference to the first processing module 123 . Or the sub-extraction unit 1223 outputs the power of the second sub-beam and the power of the fourth sub-beam to the first processing module 123.
- the first processing module 123 adjusts the phase modulation voltage of at least one phase modulation unit 121 based on the principle of adjusting the power difference to be less than or equal to the reference value.
- the power difference between the first component and the second component is relatively small, indicating that the power of the first component and the second component is relatively close, and the power of the two local oscillator lights of the same wavelength can be balanced.
- FIG. 20 provides another structural schematic diagram of the first polarization control module 70.
- the feedback extraction unit 122 includes a first 1 ⁇ 2 optical splitter 1221 and a sub-extraction unit 1223 .
- the plurality of phase modulation units 121 output two sub-beams after phase modulation processing, one sub-beam is output to the first 1 ⁇ 2 optical splitter 1221 , and the other sub-beam is output to the first receiving module 90 .
- the first 1 ⁇ 2 optical splitter 1221 divides the received sub-beam into a first sub-beam and a second sub-beam, and outputs them to the first receiving module 90 and the sub-extraction unit 1223 respectively. Wherein, the power of the first sub-beam is greater than the power of the second sub-beam.
- the sub-extraction unit 1223 receives the second sub-beam, detects the power of the second sub-beam, and outputs the power of the second sub-beam to the first processing module 123. power.
- the first processing module 123 adjusts the phase modulation voltage of at least one phase modulation unit 121 according to the principle of adjusting the power to a target value.
- the target value is half of the total power of the first sub-beam and the second sub-beam. In this way, the power of the second sub-beam is adjusted to the target value, and the power of the first sub-beam is also close to the target value.
- the feedback extraction unit 122 may also include a second 1 ⁇ 2 optical splitter 1222 and a sub-extraction unit 1223 to extract the power of the fourth sub-beam.
- a second 1 ⁇ 2 optical splitter 1222 and a sub-extraction unit 1223 to extract the power of the fourth sub-beam.
- the sub-extraction unit 1223 includes a photodetector and an ADC.
- the photodetector detects power, and the ADC converts the power into an analog signal and sends the analog signal to the first processing module 123 .
- the first processing module 123 determines the phase modulation voltage indication information and sends the phase modulation voltage indication information to at least one phase modulation unit 121.
- the phase modulation voltage indication information may be sent in the form of an analog signal.
- the polarization state of the third light beam modulated with data is an orthogonal polarization state.
- Figure 21 provides a schematic structural diagram of the first receiving module 90.
- the first receiving module 90 includes a second PSR 21 , a first coherent receiving unit 901 and a second processing module 25 .
- the first coherent receiving unit 901 includes mixer 1, mixer 2 and photoelectric conversion module C.
- the second PSR21 receives the first signal light and separates the first signal light into a first sub-signal light and a second sub-signal light.
- the first sub-signal light is a polarized signal light in the received first signal light.
- the second sub-signal light is the signal light of another polarization state in the first signal light.
- the one polarization state is orthogonal to the other polarization state.
- the first sub-signal light includes a third beam modulated with data.
- the second sub-signal light The light includes a third beam modulated with data.
- the first sub-signal light and the second sub-signal light are respectively transmitted to the first coherent receiving unit 901.
- the first coherent receiving unit 901 inputs the first component of the first light beam and the first sub-signal light into the mixer 1, performs mixing processing, and outputs the mixed optical signal to the photoelectric conversion module C to obtain the first result.
- the first result is an electrical signal.
- the second component of the first light beam and the second sub-signal light into the mixer 2 to perform mixing processing, and output the mixed optical signal to the photoelectric conversion module C to obtain the second result.
- the second result is electric signal.
- the first coherent receiving unit 901 sends the first result and the second result to the second processing module 25 .
- the second processing module 25 uses the first result and the second result to obtain modulated data on the third light beam.
- the second processing module 25 includes a TIA, an ADC and a third DSP.
- TIA amplifies electrical signals.
- ADC converts the amplified electrical signal into a digital signal.
- the third DSP obtains the modulated data on the third beam according to the digital signal.
- the second PSR21 and the first coherent receiving unit 901 are implemented by a silicon optical chip
- the second PSR21 converts the signal light of the TM mode polarization mode sent by the coherent sending device into the signal light of the TE mode polarization mode, so that The first signal light can be transmitted on the silicon photonic chip.
- the second polarization control module 80 divides the second beam into two sub-beams, and performs phase modulation processing on the two sub-beams, so that the power difference of the two sub-beams after the phase modulation processing is Less than or equal to the reference value.
- FIG. 22 provides a schematic structural diagram of the second polarization control module 80.
- the second polarization control module 80 includes a fifth PSR 801 and a first control unit 802.
- the fifth PSR 801 receives the second beam and divides the second beam into two sub-beams.
- the first control unit 802 performs phase modulation processing on the two sub-beams, that is, adjusts the phases of the two sub-beams, extracts feedback information from at least one sub-beam after the phase modulation processing, the feedback information may be optical power, etc., and sends it to
- the second receiving module 100 outputs two sub-beams after phase modulation processing.
- the first control unit 802 uses the feedback information to adjust the phase modulation voltage for phase modulation processing, and uses the adjusted phase modulation voltage to control the power difference of the two sub-beams after the phase modulation processing to be less than or equal to the reference value.
- the first control unit 802 includes M phase modulation units 121, feedback extraction units 122 and a fifth processing module 8021, where M is greater than or equal to 1.
- M takes the value 2.
- the M phase modulation units 121 perform phase modulation processing on the two sub-beams output by the fifth PSR801, and output the two sub-beams after phase modulation processing to the second receiving module 100.
- the feedback extraction unit 122 extracts feedback from at least one sub-beam after phase modulation processing. Feed information.
- the fifth processing module 8021 uses the feedback information to determine the phase modulation voltage of at least one phase modulation unit 121, and uses the adjusted phase modulation voltage to control the phase modulation unit 121 so that the power difference of the two sub-beams after the phase modulation processing is less than or Equal to the participation value.
- the structure of the feedback extraction unit 122 is the same as the structure of the feedback extraction unit 122 shown in FIGS. 19 and 20 , and will not be described again here.
- the first control unit 802 may also include a first 2 ⁇ 2 optical coupler.
- the first 2 ⁇ 2 optical coupler is located in front of the M phase modulation units 121 and adjacent to the M phase modulation units 121.
- FIG. 23 provides a schematic structural diagram of the second receiving module 100.
- the second receiving module 100 includes a sixth PSR 1001 , a second coherent receiving unit 102 and a sixth processing module 103 .
- the second coherent receiving unit 102 includes a mixer A, a mixer B and a photoelectric conversion module D.
- the sixth PSR1001 receives the second signal light and separates the second signal light into the third sub-signal light and the fourth sub-signal light.
- the third sub-signal light is the signal light of one polarization state in the second signal light.
- the fourth sub-signal light The signal light is the signal light of another polarization state in the second signal light. The one polarization state is orthogonal to the other polarization state.
- the third sub-signal light includes a fourth light beam modulated with data.
- the fourth sub-signal light includes modulated data.
- the fourth beam with data The third sub-signal light and the fourth sub-signal light are transmitted to the second coherent receiving unit 102 respectively.
- the second coherent receiving unit 102 inputs the first component of the second light beam and the third sub-signal light into the mixer A, performs mixing processing, and outputs the mixed optical signal to the photoelectric conversion module D to obtain the third result.
- the third result is an electrical signal.
- the second coherent receiving unit 102 sends the third result and the fourth result to the sixth processing module 103 .
- the sixth processing module 103 uses the third result and the fourth result to obtain modulated data on the fourth light beam.
- the sixth processing module 103 includes a TIA, an ADC and a fourth DSP.
- TIA amplifies electrical signals.
- ADC converts the amplified electrical signal into a digital signal.
- the fourth DSP obtains modulated data on the fourth light beam according to the digital signal.
- the sixth PSR1001 and the second coherent receiving unit 102 are implemented by silicon optical chips, the sixth PSR1001 converts the signal light of the TM mode polarization mode sent by the coherent transmitting device into the signal light of the TE mode polarization mode, so that The second signal light can be transmitted on the silicon photonic chip.
- the coherent communication device can both send data to other coherent communication devices using the first and second wavelengths of light, and can also receive data sent by other communication devices using the third and fourth wavelengths of light.
- Figure 24 provides a schematic structural diagram of a coherent communication device.
- the coherent communication device includes a coherent transmitting device, a coherent receiving device, a first connection module 30 and a second connection module 40 .
- the coherent transmission device includes a light source 01, a first transmission module 10, a second transmission module 20, a first connection module 30 and a second connection module 40.
- the coherent receiving device includes a third polarization control module 001, a fourth polarization control module 002, a third receiving module 003 and a fourth receiving module 004.
- the light source 01 outputs the first beam and the second beam to the second connection module 40 , the light source 01 outputs the third beam to the first sending module 10 , and the fourth beam to the second sending module 20 .
- the wavelength of the first beam and the third beam is the first wavelength, and the wavelength of the second beam and the fourth beam is the second wavelength.
- the second connection module 40 outputs the first light beam and the second light beam respectively.
- the first light beam and the second light beam are output through an external optical fiber connected by the second connection module 40 .
- the first sending module 10 modulates the data onto the third light beam, obtains the first signal light, and outputs the first signal light to the first connection module 30 .
- the second sending module 20 modulates the data onto the fourth light beam, obtains the second signal light, and sends it to the first connection module 30 outputs the second signal light.
- the first connection module 30 outputs the first signal light and the second signal light respectively.
- the first local oscillator light and the second signal light are output through an external optical fiber connected to the first connection module 30 .
- the second connection module 40 receives the second local oscillator light and the third local oscillator light.
- the wavelength of the second local oscillator light is the third wavelength
- the wavelength of the third local oscillator light is the fourth wavelength.
- the second connection module 40 sends the second local light to the third polarization control module 001, and sends the third local light to the fourth polarization control module 002.
- the third polarization control module 001 divides the second local oscillation light into a first component and a second component, and controls the power difference between the first component and the second component to be less than or equal to a reference value, and the reference value is relatively small.
- the first connection module 30 receives the third signal light, and the wavelength of the third signal light is the third wavelength.
- the first connection module 30 sends the third signal light to the third receiving module 003.
- the third receiving module 003 divides the third signal light into two sub-signal lights, and uses the first component and the second component of the second local oscillator light to respectively obtain the modulated data on the two sub-signal lights.
- the fourth polarization control module 002 divides the third local oscillation light into a first component and a second component, and controls the power difference between the first component and the second component to be less than or equal to a reference value, and the reference value is relatively small.
- the first connection module 30 receives the fourth signal light, the fourth wavelength of the fourth signal light.
- the first connection module 30 sends the fourth signal light to the fourth receiving module 004.
- the fourth receiving module 004 divides the fourth signal light into two sub-signal lights, and uses the first component and the second component of the third local oscillator light to obtain modulated data on the two sub-signal lights respectively.
- the coherent sending device in the coherent communication device uses the light of the first wavelength and the second wavelength to send data to another coherent communication device, and uses the light of the third wavelength and the fourth wavelength to receive the data sent by the other coherent communication device, These four wavelengths are not equal.
- coherent communication device A and coherent communication device B communicate.
- Coherent communication device A uses the light of the first wavelength and the second wavelength to send data to the coherent communication device B
- the coherent communication device B uses the local oscillator light of the first wavelength and the second wavelength sent by the coherent communication device A to receive the coherent communication device A. sent data.
- the coherent communication device B uses the third wavelength and the fourth wavelength of light to send data to the coherent communication device A
- the coherent communication device A uses the third wavelength and the fourth wavelength of the local oscillator light sent by the coherent communication device B to receive the coherent communication device B. sent data.
- first and second are used to distinguish identical or similar items with basically the same functions and functions. It should be understood that there is no logical or logical connection between “first” and “second”. Timing dependencies do not limit the number and execution order. It should also be understood that, although the following description uses the terms first, second, etc. to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, a first beam may be referred to as a second beam, and similarly, the second beam may be referred to as a first beam, without departing from the scope of various examples. Both the first light beam and the second light beam may be light beams, and in some cases, may be separate and different local oscillator lights.
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Abstract
本申请提供了一种相干接收装置、相干发送装置和相干通信***,属于光通信技术领域。该相干接收装置包括偏振控制模块和数据接收模块。偏振控制模块用于接收第一本振光,第一本振光包括偏振态互为正交的第一光束与第二光束,第一光束的波长为第一波长,第二光束的波长为第二波长,通过控制第一本振光的偏振态,将第一本振光分为第一光束和第二光束。数据接收模块用于接收第一信号光,第一信号光包括调制有数据的第三光束和调制有数据的第四光束,第三光束的波长为第一波长,第四光束的波长为第二波长,使用第一光束获取第三光束上调制的数据,使用第二光束获取第四光束上调制的数据。采用本申请的方案,能够实现双波长的偏振控制和跟踪。
Description
本申请要求于2022年3月18日提交中国国家知识产权局、申请号为202210272429.0、申请名称为“相干接收装置、相干发送装置和相干通信***”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及相干光通信技术领域,特别涉及一种相干接收装置、相干发送装置和相干通信***。
在信号传输过程中,相干传输技术的频谱效率比其他传输方式要高,尤其在长距离和高数据速率的情况下,相干传输技术既能保持优异的传输性能又能克服信号高速传输而产生的严重损耗,因此相干传输技术被广泛应用于海缆、长途骨干以及城域传输网络中。而且,在相干传输技术中,同源相干技术具有低功耗和低成本的优点,使其在信号传输领域被广泛的应用。在采用同源相干技术进行信号传输时,本振光的偏振态直接影响相干接收质量,因此如何跟踪和控制本振光的偏振态至关重要。
目前同源相干技术应用在800G单波长的相干通信***中,但是由于光电器件带宽很难突破130GB以上,未来所需的1.6T的相干通信***通过双波长的800G***更容易实现,所以需要为双波长的相干通信***提供本振光的跟踪和控制方案。
发明内容
本申请提供了一种相干接收装置、相干发送装置和相干通信***,能够实现双波长的相干通信,且能够对本振光进行跟踪和控制。
第一方面,本申请提供了一种相干接收装置,该相干接收装置包括:包括偏振控制模块和数据接收模块;该偏振控制模块用于,接收第一本振光,该第一本振光包括偏振态互为正交的第一光束与第二光束,该第一光束的波长为第一波长,该第二光束的波长为第二波长;通过控制该第一本振光的偏振态,将该第一本振光分为该第一光束和该第二光束;该数据接收模块用于,接收第一信号光,该第一信号光包括调制有数据的第三光束和调制有数据的第四光束,该第三光束的波长为该第一波长,该第四光束的波长为该第二波长;使用该第一光束获取该第三光束上调制的数据,使用该第二光束获取该第四光束上调制的数据。
本申请所示的方案中,偏振控制模块通过控制偏振态,能够将两个波长的本振光分离开,数据接收模块使用两个波长的本振光,分别接收两个波长的信号光上调制的数据。这样,能够实现波长的相干通信,并且能够对本振光进行跟踪和控制,使得相干接收的质量比较高。
在一种可能实现方式中,该偏振控制模块用于:将该第一本振光分为两个光束;对该两个光束进行调相处理,使得调相处理后的两个光束分别为该第一光束和该第二光束。
本申请所示的方案中,能够使用调相处理,使得两个波长的本振光分离开。
在一种可能实现方式中,该偏振控制模块包括第一偏振分束旋转器(polarization splitter
rotator,PSR)和控制单元;该第一PSR用于,接收第一本振光,将该第一本振光分为两个光束;该控制单元用于,对该两个光束进行调相处理,向该数据接收模块输出调相处理后的两个光束;从调相处理后的至少一个光束中提取反馈信息;基于该反馈信息,调整进行调相处理的调相电压,使得调相处理后的两个光束分别为该第一光束和该第二光束。
本申请所示的方案中,通过反馈信息,控制调相处理的调相电压,使得能够更快速且准确分离第一光束和第二光束。
在一种可能实现方式中,该控制单元包括N个调相单元、反馈提取单元和第一处理模块,N大于或等于1;该N个调相单元用于,对该第一PSR输出的两个光束进行调相处理,向该数据接收模块输出调相处理后的两个光束;该反馈提取单元用于,从调相处理后的至少一个光束中提取反馈信息;该第一处理模块用于,基于该反馈信息,调整该N个调相单元中至少一个调相单元的调相电压使得调相处理后的两个光束分别为该第一光束和该第二光束。
本申请所示的方案中,通过反馈信息,控制调相处理的调相电压,使得更快速且准确分离第一光束和第二光束。
在一种可能的实现方式中,该控制单元包括第一2×2光耦合器、N个调相单元、反馈提取单元和第一处理模块,N大于或等于1。该第一2×2光耦合器用于接收第一PSR输出的两个光束,调整该两个光束的偏振态的旋转角,输出两个光束,该N个调相单元用于,对该2×2光耦合器输出的两个光束进行调相处理;该反馈提取单元用于,从调相处理后的至少一个光束中提取反馈信息,并向该数据接收模块输出调相处理后的两个光束;该第一处理模块用于,基于该反馈信息,调整该N个调相单元中至少一个调相单元的调相电压,使得调相处理后的两个光束分别为该第一光束和该第二光束。
在一种可能实现方式中,该N个调相单元中第1个至第N个调相单元沿着本振光传输方向依次排布,N大于1;每个调相单元包括调相器和2×2光耦合器;第1个调相单元中调相器的输入端口和输出端口分别与该第一PSR的一个输出端口、该第1个调相单元中2×2光耦合器的第一输入端口连接;该第1个调相单元中2×2光耦合器的第二输入端口与该第一PSR的另一个输出端口连接;第i-1个调相单元中2×2光耦合器的两个输出端口分别与第i个调相单元中调相器的输入端口、2×2光耦合器的第一输入端口连接;该第i-1个调相单元中调相器的输出端口与2×2光耦合器的第二输入端口连接,i大于1,且小于或等于N;该第N个调相单元中2×2光耦合器的两个输出端口分别与该反馈提取单元连接;该第一处理模块,用于基于该反馈信息,调整该至少一个调相单元中调相器的调相电压。
本申请所示的方案中,调相单元通过调相器和2×2光耦合器实现,通过调整调相器的调相电压,使得更快速且准确分离第一光束和第二光束。
在一种可能实现方式中,该反馈提取单元包括第一1×2分光器、第二1×2分光器和子提取单元;该N个调相单元用于,分别向该第一1×2分光器和该第二1×2分光器输出调相处理后的两个光束。该第一1×2分光器用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向该数据接收模块和该子提取单元输出;该第二1×2分光器用于,将调相处理后的另一个光束分为第三子光束和第四子光束,分别向该数据接收模块和该子提取单元输出;该子提取单元用于,确定目标功率,该目标功率包括该第二子光束中该第二波长的光和该第四子光束中该第一波长的光的功率之和,或者包括该第二子光束中该第二波长的光的功率和该第四子光束中该第一波长的光的功率;该第一处理模块用于,以将该目标功率调整为最小值为原则,调整该至少一个调相单元的调相电压,以使该第一子光束的波长为第一波长,该第三子光束的波长为第二波长。
本申请所示的方案中,确定第一光束的输出光路中第二波长的光的功率最小,且第二光束的输出光路中第一波长的光的功率最小,使得第一光束的输出光路中不包括第二波长的光,且第二光束的输出光路中不包括第一波长的光,因此,能够将第一光束和第二光束分离后输出。
在一种可能实现方式中,该反馈提取单元包括第一1×2分光器和子提取单元;N个调相单元用于,分别向该第一1×2分光器和该数据接收模块输出调相处理后的两个光束。该第一1×2分光器用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向该数据接收模块和该子提取单元输出;该子提取单元用于,确定该第二子光束中该第二波长的光的功率;该第一处理模块用于,以将该功率调整为最小值为原则,调整该至少一个调相单元的调相电压,以使该第一子光束的波长为第一波长。
本申请所示的方案中,确定第一光束的输出光路中第二波长的光的功率最小,使得第一光束的输出光路中不包括第二波长的光,那么第二光束的输出光路中也不包括第一波长的光,因此,能够将第一光束和第二光束分离后输出。
在一种可能实现方式中,调制有数据的第三光束的偏振态为正交偏振态,调制有数据的第四光束的偏振态为正交偏振态;该数据接收模块包括第二PSR、第一分波模块、第二分波模块、相干接收单元和第二处理模块;该第二PSR用于,接收该第一信号光,将该第一信号光分为第一子信号光和第二子信号光;该第一分波模块用于,将该第一子信号光分为该第一波长的信号光和该第二波长的信号光;该第二分波模块用于,将该第二子信号光分为该第一波长的信号光和该第二波长的信号光;该相干接收单元用于,使用该第一光束,对该第一波长的信号光进行相干接收,获得第一结果,并使用该第二光束,对该第二波长的信号光进行相干接收,获得第二结果;该第二处理模块用于,基于该第一结果和该第二结果,获得该第三光束和该第四光束上调制的数据。这样,提供了一种实现双波长相干接收的数据接收模块。
第二方面,本申请提供了一种相干发送装置,该相干发送装置包括光源、偏振改变模块和数据发送模块;该光源用于,输出第一光束、第二光束、第三光束和第四光束,该第一光束和该第三光束的波长为第一波长,该第二光束和该第四光束的波长为第二波长;该偏振改变模块用于,将该第一光束和该第二光束合并为一束偏振态互为正交的第一本振光,输出该第一本振光;该数据发送模块用于,将数据调制到该第三光束和该第四光束上,获得第一信号光,输出该第一信号光。
本申请所示的方案中,将第一光束和第二光束的偏振态调整为正交后进行发送,能够使得相干接收装置将第一光束和第二光束分离开。
在一种可能实现方式中,该数据发送模块包括处理模块、第一调制器、第二调制器、第一合波模块、第二合波模块和PSR;该处理模块用于,提供该数据;该第一调制器用于,将该第三光束分为第一路子光束和第二路子光束,将数据分别调制到该第一路子光束和该第二路子光束上;该第二调制器用于,将该第四光束分为第三路子光束和第四路子光束,将数据分别调制到该第三路子光束和该第四路子光束上;该第一合波模块,用于将调制有数据的该第一路子光束和调制有数据的该第三路子光束合并为第一子信号光;该第二合波模块,用于将调制有数据的该第二路子光束和调制有数据的该第四路子光束合并为第二子信号光;该PSR用于,调整该第一子信号光的偏振态为与该第二子信号光的偏振态正交的偏振态,合并调整偏振态后的该第一子信号光和该第二子信号光,得到该第一信号光。这样,提供了一种实现双波长相干发送的数据发送模块。
第三方面,本申请提供了一种相干通信***,该相干通信***包括通过光纤连接的相干
发送装置和相干接收装置,该相干发送装置包括光源、偏振改变模块和数据发送模块,该相干接收装置包括偏振控制模块和数据接收模块;该光源用于,输出第一光束、第二光束、第三光束和第四光束,该第一光束和该第三光束的波长为第一波长,该第二光束和该第四光束的波长为第二波长;偏振改变模块用于,将该第一光束和该第二光束合并为一束偏振态互为正交的第一本振光,输出该第一本振光;该数据发送模块用于,将数据调制到该第三光束和该第四光束上,获得第一信号光,输出该第一信号光;该偏振控制模块用于,接收该第一本振光;通过控制该第一本振光的偏振态,将该第一本振光分为该第一光束和该第二光束;该数据接收模块用于,接收该第四光束;使用该第一光束获取该第三光束上调制的数据,使用该第二光束获取该第四光束上调制的数据。
本申请所示的方案中,相干发送装置将双波长本振光的偏振态调整为正交后进行发送,并且通过双波长信号光发送数据。相干接收装置通过控制偏振态,能够将两个波长的本振光分离开,使用两个波长的本振光,分别接收两个波长的信号光上调制的数据。这样,能够实现双波长的相干通信,并且能够对本振光进行跟踪和控制,使得相干通信的质量比较高。
在一种可能实现方式中,该偏振控制模块用于:将该第一本振光分为两个光束;对该两个光束进行调相处理,使得调相处理后的两个光束分别为该第一光束和该第二光束。
在一种可能实现方式中,该偏振控制模块包括第一PSR和控制单元;该第一PSR用于,接收第一本振光,将该第一本振光分为两个光束;该控制单元用于,对该两个光束进行调相处理,向该数据接收模块输出调相处理后的两个光束;从调相处理后的至少一个光束中提取反馈信息;基于该反馈信息,调整进行调相处理的调相电压,使得调相处理后的两个光束分别为该第一光束和该第二光束。
在一种可能实现方式中,该控制单元包括N个调相单元、反馈提取单元和第一处理模块,N大于或等于1;该N个调相单元用于,对该第一PSR输出的两个光束进行调相处理,向该数据接收模块输出调相处理后的两个光束;该反馈提取单元用于,从调相处理后的至少一个光束中提取反馈信息;该第一处理模块用于,基于该反馈信息,调整该N个调相单元中至少一个调相单元的调相电压,使得调相处理后的两个光束分别为该第一光束和该第二光束。
在一种可能实现方式中,该反馈提取单元包括第一1×2分光器、第二1×2分光器和子提取单元;N个调相单元用于,分别向该第一1×2分光器和该第二1×2分光器输出调相处理后的两个光束。该第一1×2分光器用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向该数据接收模块和该子提取单元输出;该第二1×2分光器用于,将调相处理后的另一个光束分为第三子光束和第四子光束,分别向该数据接收模块和该子提取单元输出;该子提取单元用于,确定目标功率,该目标功率包括该第二子光束中该第二波长的光和该第四子光束中该第一波长的光的功率之和,或者包括该第二子光束中该第二波长的光的功率和该第四子光束中该第一波长的光的功率;该第一处理模块用于,以将该目标功率调整为最小值为原则,调整该至少一个调相单元的调相电压,以使该第一子光束的波长为第一波长,该第三子光束的波长为二波长。
在一种可能实现方式中,该反馈提取单元包括第一1×2分光器和子提取单元;N个调相单元用于,分别向该第一1×2分光器和该数据接收模块输出调相处理后的两个光束。该第一1×2分光器用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向该数据接收模块和该子提取单元输出;该子提取单元用于,确定该第二子光束中该第二波长的光的功率;该第一处理模块用于,以将该功率调整为最小值为原则,调整该至少一个调相单元的调相电压,以使该第一子光束的波长为第一波长。
第四方面,本申请提供了一种相干通信***,包括通过光纤连接的相干发送装置和相干接收装置;该相干发送装置包括光源、第一发送模块、第二发送模块、第一连接模块和第二连接模块;该相干接收装置包括第三连接模块、第四连接模块、第一偏振控制模块、第二偏振控制模块、第一接收模块和第二接收模块;该光源用于,向该第一连接模块分别输出第一光束和第二光束,并向该第一发送模块和第二发送模块分别输出第三光束和第四光束;该第一光束和该第三光束的波长为第一波长,该第二光束和该第四光束的波长为第二波长;该第一连接模块用于,分别输出该第一光束和该第二光束;该第一发送模块用于,将数据调制到该第三光束上,获得第一信号光,向该第二连接模块输出该第一信号光;该第二发送模块用于,将数据调制到该第四光束上,获得第二信号光,向该第二连接模块输出该第二信号光;该第二连接模块用于,分别输出该第一信号光和该第二信号光;该第三连接模块用于,接收该第一光束和该第二光束,向该第一偏振控制模块发送该第一光束,并向该第二偏振控制模块发送该第二光束;该第一偏振控制模块用于,控制该第一光束的第一分量和第二分量的功率差值小于或等于参考数值;该第二偏振控制模块用于,控制该第二光束的第一分量和第二分量的功率差值小于或等于参考数值;该第四连接模块用于,接收该第一信号光和该第二信号光,向该第一接收模块发送该第一信号光,并向该第二接收模块发送该第二信号光;该第一接收模块,用于将该第一信号光分为两路子信号光,使用该第一光束的第一分量和第二分量分别获取该第一信号光的两路子信号光上调制的数据;该第二接收模块,用于将该第二信号光分为两路子信号光,使用该第二光束的第一分量和第二分量分别获取该第二信号光的两路子信号光上调制的数据。
本申请所示的方案中,相干发送装置发送双波长的本振光,并通过双波长的信号光发送数据。相干接收装置使用两个偏振控制模块,分别控制双波长的本振光,使得每个波长的本振光能够分离为第一分量和第二分量,且第一分量和第二分量的功率相接近或者相等。对于第一波长的第一光束,第一分量用于接收第一信号光中一路子信号光(该一路子信号光被相干接收装置接收到时为第一偏振态),第二分量用于接收第一信号光中另一路子信号光(该另一路子信号光被相干接收装置接收到时为第二偏振态),第一偏振态与第二偏振态正交。对于第二波长的第二光束,第一分量用于接收第二信号光中一路子信号光,第二分量用于接收第一信号光中另一路子信号光。这样,由于第一分量和第二分量的功率相接近或者相等,所以能够使得每个正交偏振态的信号光均能被接收。
在一种可能实现方式中,该第一偏振控制模块用于:将该第一光束分为两个子光束;对该两个子光束进行调相处理,使得调相处理后的两个子光束的功率差值小于或等于参考数值,调相处理后的两个子光束分别为第一分量与第二分量。
本申请所示的方案中,能够使用调相处理,使得第一光束的第一分量和第二分量的功率相接近。
在一种可能实现方式中,该第一偏振控制模块包括第一PSR和控制单元;该第一PSR用于,接收第一光束,将该第一光束分为两个子光束;该控制单元用于,对该两个子光束进行调相处理,向该第一接收模块输出调相处理后的两个子光束;从调相处理后的至少一个子光束中提取反馈信息;基于该反馈信息,调整进行调相处理的调相电压,使得调相处理后的两个子光束的功率差值小于或等于参考数值。
本申请所示的方案中,通过反馈信息,控制调相处理的调相电压,使得第一光束的第一分量和第二分量的功率相接近。
在一种可能实现方式中,该控制单元包括M个调相单元、反馈提取单元和第一处理模块,
N大于或等于1;该M个调相单元用于,对该第一PSR输出的两个子光束进行调相处理,向该第一接收模块输出调相处理后的两个子光束;该反馈提取单元用于,从调相处理后的至少一个子光束中提取反馈信息;该第一处理模块用于,基于该反馈信息,调整该M个调相单元中至少一个调相单元的调相电压,使得调相处理后的两个子光束的功率差值小于或等于参考数值。
本申请所示的方案中,通过反馈信息,控制调相处理的调相电压,使得第一光束的第一分量和第二分量的功率相接近。
在一种可能实现方式中,该M个调相单元中第1个至第M个调相单元沿着本振光传输方向依次排布,M大于1;每个调相单元包括调相器和2×2光耦合器;第1个调相单元中调相器的输入端口和输出端口分别与该第一PSR的一个输出端口、该第1个调相单元中2×2光耦合器的第一输入端口连接;该第1个调相单元中2×2光耦合器的第二输入端口与该第一PSR的另一个输出端口连接;第i-1个调相单元中2×2光耦合器的两个输出端口分别与第i个调相单元中调相器的输入端口、2×2光耦合器的第一输入端口连接;该第i-1个调相单元中调相器的输出端口与2×2光耦合器的第二输入端口连接,i大于1,且小于或等于M;第M个调相单元中2×2光耦合器的两个输出端口分别与该反馈提取单元连接;该第一处理模块,用于基于该反馈信息,调整该至少一个调相单元中调相器的调相电压。
本申请所示的方案中,调相单元通过调相器和2×2光耦合器实现,通过调整调相器的调相电压,使得第一光束的第一分量和第二分量的功率相接近。
在一种可能实现方式中,该反馈提取单元包括第一1×2分光器、第二1×2分光器和子提取单元;该M个调相单元用于,分别向该第一1×2分光器和第二1×2分光器输出调相处理后的两个子光束。该第一1×2分光器用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向该第一接收模块和该子提取单元输出;该第二1×2分光器用于,将调相处理后的另一子光束分为第三子光束和第四子光束,分别向该第一接收模块和该子提取单元输出;该子提取单元用于,确定第一功率,该第一功率包括该第二子光束与该第四子光束的功率的差值,或者包括该第二子光束的功率和该第四子光束的功率;该第一处理模块用于,以将该第二子光束的功率和该第四子光束的功率差值调整为小于或等于参考数值为原则,调整该至少一个调相单元的调相电压。
本申请所示的方案中,对于第一光束,确定第一分量和第二分量的功率差最小,使得第一光束的第一分量和第二分量的功率相接近。
在一种可能实现方式中,该反馈提取单元包括第一1×2分光器和子提取单元;M个调相单元用于,分别向该第一1×2分光器和该第一接收模块输出调相处理后的两个子光束。该第一1×2分光器用于,将调相处理后的一子光束分为第一子光束和第二子光束,分别向该第一接收模块和该子提取单元输出;该子提取单元用于,确定该第二子光束的功率;该第一处理模块用于,以将该第二子光束的功率调整为目标数值为原则,调整该至少一个调相单元的调相电压。
本申请所示的方案中,第二子光束的功率为目标数值,说明第二子光束与第一子光束的功率相等,因此,通过控制第二子光束的功率为目标数值,能够使得第一光束的第一分量和第二分量的功率相接近。
在一种可能实现方式中,该第一接收模块包括第二PSR、第一相干接收单元和第二处理模块;该第二PSR,用于将该第一信号光分为第一子信号光和第二子信号光;该第一相干接收单元,用于使用该第一光束的第一分量,对该第一子信号光进行相干接收,获得第一结果;
并使用该第一光束的第二分量,对该第二子信号光进行相干接收,获得第二结果;该第二处理模块,用于基于该第一结果和该第二结果,获得该第一信号光上调制的数据。
这样,提供了一种相干接收的接收模块。
在一种可能实现方式中,该第二接收模块包括第六PSR、第二相干接收单元和第六处理模块;该第六PSR,用于将该第二信号光分为第三子信号光和第四子信号光;该第二相干接收单元,用于使用该第二光束的第一分量,对该第三子信号光进行相干接收,获得第三结果;并使用该第一光束的第二分量,对该第四子信号光进行相干接收,获得第四结果;该第六处理模块,用于基于该第三结果和该第四结果,获得该第二信号光上调制的数据。这样,提供了一种相干接收的接收模块。
图1是本申请一个示例性实施例提供的相干发送装置的结构示意图;
图2是本申请一个示例性实施例提供的相干发送装置的结构示意图;
图3是本申请一个示例性实施例提供的相干发送装置的结构示意图;
图4是本申请一个示例性实施例提供的数据接收模块的结构示意图;
图5是本申请一个示例性实施例提供的相干接收装置的结构示意图;
图6是本申请一个示例性实施例提供的相干接收装置的结构示意图;
图7是本申请一个示例性实施例提供的偏振控制模块的结构示意图;
图8是本申请一个示例性实施例提供的偏振控制模块的结构示意图;
图9是本申请一个示例性实施例提供的相干接收装置的结构示意图;
图10是本申请一个示例性实施例提供的相干接收装置的结构示意图;
图11是本申请一个示例性实施例提供的相干接收装置的结构示意图;
图12是本申请一个示例性实施例提供的相干通信设备的结构示意图;
图13是本申请一个示例性实施例提供的相干通信***的结构示意图;
图14是本申请一个示例性实施例提供的相干通信***的结构示意图;
图15是本申请一个示例性实施例提供的相干通信设备的结构示意图;
图16是本申请一个示例性实施例提供的第一发送模块的结构示意图;
图17是本申请一个示例性实施例提供的第二发送模块的结构示意图;
图18是本申请一个示例性实施例提供的第一偏振控制模块的结构示意图;
图19是本申请一个示例性实施例提供的第一偏振控制模块的结构示意图;
图20是本申请一个示例性实施例提供的第一偏振控制模块的结构示意图;
图21是本申请一个示例性实施例提供的第一接收模块的结构示意图;
图22是本申请一个示例性实施例提供的第二偏振控制模块的结构示意图;
图23是本申请一个示例性实施例提供的第二接收模块的结构示意图;
图24是本申请一个示例性实施例提供的相干通信设备的结构示意图;
图25是本申请一个示例性实施例提供的相干通信***的结构示意图。
图示说明
01、光源;02、偏振改变模块;03、数据发送模块;
011、第一子光源;1221、第一1×2分光器;012、第二子光源;1222、第二1×2分光器;
030、处理模块;031、第一调制器;032、第二调制器;033、第一合波模块;034、第二合波模块;035、PSR;
1、偏振控制模块;2、数据接收模块;11、第一PSR;12、控制单元;121、调相单元;122、反馈提取单元;123、第一处理模块;1211、调相器;1222、2×2光耦合器;
21、第二PSR;22、第一分波模块;23、第二分波模块;24、相干接收单元;25、第二处理模块;
241、第一子相干接收单元;242、第二子相干接收单元;
10、第一发送模块;20、第二发送模块;30、第一连接模块;40、第二连接模块;50、第三连接模块;60、第四连接模块;70、第一偏振控制模块;80、第二偏振控制模块;90、第一接收模块;100、第二接收模块;
0001、目标偏振控制模块;0002、第一数据接收模块;
101、第三处理模块;201、第四处理模块;202、第四PSR;
901、第一相干接收单元;801、第五PSR;802、第一控制单元;8021、第五处理模块;
102、第二相干接收单元;103、第六处理模块;1001、第六PSR1001;
001、第三偏振控制模块;002、第四偏振控制模块;003、第三接收模块;004、第四接收模块。
为使本申请的目的、技术方案和优点更加清楚,下面将结合附图对本申请实施方式作进一步地详细描述。
下面对本申请实施例涉及的一些术语概念做解释说明。
(1)相干光,是指有确定的频率和相位的光。示例性的,相干光可以为由激光器产生的具有空间叠加和相互干涉特性的激光。
(2)相干通信***,是一种光纤通信***,也可以称为是相干光通信***或者相干光传输***。相干通信***利用相干光的相位、频率和幅度等多个维度的参量来承载更多的调制信息,以充分利用光纤带宽,实现超高容量的数据传输。
(3)同源相干通信***,是相干发送装置中的激光器发出的光被分为两路,一路给调制器加载数据,加载数据后的信号光通过一根光传输至相干接收装置,另一路光通过另一根光纤同时传输到相干接收装置作为本振光。
目前同源相干技术应用在800G单波长的相干通信***中,但是由于光电器件带宽很难突破130GB以上,未来所需的1.6T的相干通信***通过双波长的800G***更容易实现,本申请实施例提供了一种相干接收装置和相干发送装置,能够实现双波长相干通信。
本申请实施例中,相干接收装置和相干发送装置能够应用于多种网络场景中。例如,可以应用于骨干光传输网络、光接入网络、数据中心互连、短距离光互连和无线业务前传或回传等场景中。
示例性的,相干接收装置可以对应于不同网络的接收侧设备,或者包括接收侧设备的***。相干发送装置可以对应于不同网络的发送侧设备,或者包括发送侧设备的***。相干通信***可以对应于不同网络的通信设备。
本申请实施例应用于同源双波长相干通信***。下面描述使用一个偏振控制模块控制两个波长的偏振态的情况。具体的,按照相干发送装置、相干接收装置、相干通信设备和相干
通信***的顺序进行描述。
(1)相干发送装置
图1提供了一种相干发送装置的结构示意图。参见图1,相干发送装置包括光源01、偏振改变模块02和数据发送模块03。其中,光源01能够提供第一光束、第二光束、第三光束和第四光束,第一光束和第三光束的波长为第一波长(λ1),第二光束和第四光束的波长为第二波长(λ2)。第一光束(λ1LO)和第二光束(λ2LO)用作本振光,第三光束(λ1s)和第四光束(λ2s)用作承载数据的光。光源01向偏振改变模块02输出第一光束和第二光束,并且向数据发送模块03输出第三光束与第四光束。
偏振改变模块02将第一光束的偏振态转变为另一偏振态,该另一偏振态与第二光束的偏振态正交,将转变偏振态的第一光束与第二光束合并为一束,得到第一本振光,向相干接收装置输出第一本振光。或者偏振改变模块02将第二光束的偏振态转变为与第一光束的偏振态正交的偏振态,将转变偏振态的第二光束与第一光束合并为一束,得到第一本振光,向相干接收装置输出第一本振光。可选地,第一本振光中第一光束的偏振态为横电(transverse electric,TE)模偏振态,TE模偏振态可以称为TE模偏振模式或X偏振态,第二光束的偏振态为横磁(transverse magnetic,TM)模偏振态,TM模偏振态也可以称为是TM偏振模式或Y偏振态。
数据发送模块03接收第三光束和第四光束,将数据调制到第三光束和第四光束上,获得第一信号光,第一信号光包括调制有数据的第三光束和调制有数据的第四光束。数据发送模块03向相干接收装置输出第一信号光。
示例性的,偏振改变模块02可以是PSR,也可以是其它能实现偏振转变的模块,本申请实施例不进行限定。
在一种实现中,图2提供了一种光源的结构示意图。参见图2,光源01包括第一子光源011、第一1×2分光器1221、第二子光源012和第二1×2分光器1222。
第一子光源011可以是第一波长的激光器,用于提供第一波长的光,第一子光源011向第一1×2分光器1221输出第一波长的光。第一1×2分光器1221将第一波长的光分为两束光,两束光分别为第一光束和第三光束,第一光束和第三光束的功率可以相等,也可以不相等。第一1×2分光器1221向偏振改变模块02输出第一光束,并向数据发送模块03中调制器输出第三光束。
第二子光源012可以是第二波长的激光器,用于提供第二波长的光,第二子光源012向第二1×2分光器1222输出第二波长的光。第二1×2分光器1222将第二波长的光分为两束光,两束光分别为第二光束和第四光束,第二光束和第四光束的功率可以相等,也可以不相等。第二1×2分光器1222向偏振改变模块02输出第二光束,并向数据发送模块03的调制器输出第四光束。
在一种实现中,图3提供了一种相干发送装置的结构示意图。参见图3,数据发送模块03包括处理模块030、第一调制器031、第二调制器032、第一合波模块033、第二合波模块034和PSR035。
处理模块030向第一调制器031和第二调制器032分别发送数据,分别发送的数据可以是不相同的数据或者相同的数据。第一调制器031接收第三光束,将第三光束分为第一路子光束和第二路子光束,将数据分别调至到第一路子光束和第二路子光束上,第一路子光束和第二路子光束上调制的数据可以相同,也可以不相同。第一调制器031向第一合波模块033输出调制有数据的第一路子光束,并且向第二合波模块034输出调制有数据的第二路子光束。
此处第一路子光束与第二路子光束的功率可以相等,也可以不相等。
第二调制器032接收第四光束,将第四光束分为第三路子光束和第四路子光束,将数据分别调至到第三路子光束和第四路子光束上,第三路子光束和第四路子光束上调制的数据可以相同,也可以不相同。第二调制器032向第一合波模块033输出调制有数据的第三路子光束,并且向第二合波模块034输出调制有数据的第四路子光束。此处第三路子光束与第四路子光束的功率可以相等,也可以不相等。
第一合波模块033将调制有数据的第一路子光束和调制有数据的第三路子光束合并为一束,得到第一子信号光,向PSR035输出第一子信号光。第二合波模块034将调制有数据的第三路子光束和调制有数据的第四路子光束合并为一束,得到第二子信号光,向PSR035输出第二子信号光。
PSR035将第一子信号光的偏振态旋转为与第二子信号光的偏振态正交,合并调整偏振态后的第一子信号光和第二子信号光为一束,得到第一信号光。这样,调制有数据的第一路子光束与调制有数据的第二路子光束的偏振态正交,调制有数据的第三路子光束与调制有数据的第四路子光束的偏振态正交,光纤中能够传输两个偏振态的数据,使得光传输通道的利用率比较高。
可选地,图4提供了一种数据发送模块03的结构示意图。参见图4,处理模块030包括第一数字信号处理器(digital signal process,DSP)、数模转换器(digital analog converter,DAC)和驱动(drivers)电路。第一DSP用于提供数据的数字信号,传输给DAC。DAC用于将数字信号转换为模拟信号,传输给驱动电路。驱动电路用于将模拟信号转换为电信号,传输给第一调制器031和第二调制器032。
可选地,第一调制器031、第二调制器032、第一合波模块033、第二合波模块034和PSR035可以通过硅光芯片实现,由于硅光芯片能传输TE模偏振模式的光,所以第一子信号光和第二子信号光在从PSR035输出之前均是TE模偏振模式,第一子信号光经过PSR035后偏振态被旋转为TM模偏振模式,第二子信号光经过PSR035后偏振态还为TE模偏振模式。
(2)相干接收装置
图5提供了一种相干接收装置的结构示意图。参见图5,相干接收装置包括偏振控制模块1和数据接收模块2。偏振控制模块1与数据接收模块2之间建立有光通信连接,例如,数据接收模块2中的部分结构与偏振控制模块1通过硅光芯片实现,偏振控制模块1与数据接收模块2通过光波导实现通信连接。
偏振控制模块1接收相干发送装置发送的第一本振光,第一本振光包括偏振态互为正交的第一光束与第二光束。偏振控制模块1能够控制第一本振光的偏振态,通过控制第一本振光的偏振态,将第一本振光分离为第一光束和第二光束。偏振控制模块1向数据接收模块2输出第一光束和第二光束。
数据接收模块2接收相干发送装置发送的第一信号光,第一信号光包括调制有数据的第三光束和调制有数据的第四光束。第三光束的波长与第一光束的波长相同,且均为第一波长,第四光束的波长与第二光束的波长相同,且均为第二波长。
数据接收模块2将第一信号光分离为调制有数据的第三光束和调制有数据的第四光束。数据接收模块2使用第一光束获取第三光束上调制的数据,并且使用第二光束获取第四光束上调制的数据。
这样,由于仅使用一个偏振控制模块1就能将两个波长的本振光分离开,所以不仅能够实现双波长的相干通信,而且能够使得相干接收装置的体积比较小。
需要说明的是,第一光束从相干发送装置发送至相干接收装置过程中,第一光束和第二光束的偏振态会发生变化,所以相干接收装置接收到的第一本振光中,虽然第一光束与第二光束的偏振态正交,但是有可能不再是TE模偏振模式和TM模偏振模式。
在一种实现中,偏振控制模块1可以将第一本振光分为两个光束,对两个光束进行调相处理,使得调相处理后的两个光束分别为第一光束和第二光束,实现两个波长的本振光的分离。
在另一种实现中,偏振控制模块1将第一本振光中的两个波长的本振光分别改变为TE模偏振模式和TM模偏振模式,然后使用一个偏振分束器,将两个波长的本振光分离开。
在一种实现中,在通过调相处理分离第一光束和第二光束的情况下,偏振控制模块1包括第一PSR11和控制单元12,参见图6。第一PSR11接收第一本振光,将第一本振光分为两个光束。控制单元12对两个光束进行调相处理,即对两个光束的相位进行调整,从调相处理后的至少一个光束中提取反馈信息,该反馈信息可以是光功率等,并向数据接收模块2输出调相处理后的两个光束。控制单元12使用该反馈信息,调整进行调相处理的调相电压,通过调整后的调相电压,使得调相处理后的两个光束分别为第一光束和第二光束。此处调相电压为调整相位的电压。
可选地,第一PSR11通过硅光芯片实现,第一本振光分为两个光束的偏振态均为TE模偏振态。
可选地,图7提供了偏振控制模块1的一种结构示意图,参见图7,控制单元12包括N个调相单元121、反馈提取单元122和第一处理模块123,N大于或等于1。例如,N取值为3。N个调相单元121对第一PSR11输出的两个光束进行调相处理,向数据接收模块2输出调相处理后的两个光束。反馈提取单元122从调相处理后的至少一个光束中提取反馈信息。第一处理模块123使用该反馈信息,确定至少一个调相单元121的调相电压,使用调整后的调相电压控制调相单元121,使得调相处理后的两个光束分别为第一光束和第二光束。
或者,该控制单元12包括第一2×2光耦合器、N个调相单元121、反馈提取单元122和第一处理模块123,N大于或等于1。第一2×2光耦合器用于接收第一PSR11输出的两个光束,调整该两个光束的偏振态的旋转角,输出两个光束。该N个调相单元121对第一2×2光耦合器输出的两个光束进行调相处理,向该数据接收模块2输出调相处理后的两个光束。该反馈提取单元122从调相处理后的至少一个光束中提取反馈信息。该第一处理模块123基于该反馈信息,调整该N个调相单元121中至少一个调相单元121的调相电压,使得调相处理后的两个光束分别为该第一光束和该第二光束。
其中,N取值1时,调相单元121包括调相器1211和2×2光耦合器1212。调相器1211用于改变输入光束的相位。2×2光耦合器1212用于将输入的两个光束耦合后再分离为两个光束。2×2光耦合器1212可以是多模干涉耦合器(multi-mode interference coupler,MMI)。
调相器1211的输入端口与第一PSR11的第一输出端口连接,第一输出端口为输出一个光束的端口,调相器1211的输出端口与2×2光耦合器1212的第一输入端口连接。第一PSR11的第二输出端口与2×2光耦合器1212的第二输入端口连接,第二输出端口为输出另一个光束的端口。2×2光耦合器1212的两个输出端口与反馈提取单元122连接,或者一个输出端口与反馈提取单元122连接,另一个与数据接收模块2连接。
N取值大于1时,N个调相单元121中第1个至第N个调相单元121沿着本振光传输方向依次排布。图8提供了偏振控制模块1的一种结构示意图,参见图8,在偏振控制模块1中,第1个调相单元121中调相器1211的输入端口与第一PSR11的第一输出端口连接,该
调相器1211的输出端口与第1个调相单元121中2×2光耦合器1212的第一输入端口连接。2×2光耦合器1212的第二输入端口与第一PSR11的第二输出端口连接。
第i-1个调相单元121中2×2光耦合器1212的两个输出端口分别与第i个调相单元121中调相器1211的输入端口、2×2光耦合器1212的第一输入端口连接。第i-1个调相单元121中调相器1211的输出端口与2×2光耦合器1212的第二输入端口连接。其中,i大于1,且小于或等于N。
第N个调相单元121是最后一个调相单元121,第N个调相单元121中2×2光耦合器1212的两个输出端口均与反馈提取单元122连接。或者,第N个调相单元121中2×2光耦合器1212的两个输出端口分别与反馈提取单元122和数据接收模块2连接。反馈提取单元122提取到反馈信息,提供给第一处理模块123。第一处理模块123基于该反馈信息,调整至少一个调相单元121中调相器1211的调相电压。
上述仅是调相单元121一种可能的结构,凡是能实现调相功能的所有形态的器件或模块结构均能应用于本申请实施例,本申请实施例对此不作限定。例如,在图7所示的偏振控制模块1中,调相器1211用于调整一个光束的相位,在另一种实现中调相器1211能够用于调整两个光束的相位。
可选地,参见图8,反馈提取单元122包括第一1×2分光器1221、第二1×2分光器1222和子提取单元1223。多个调相单元121输出调相处理后的两个光束,一个光束输出至第一1×2分光器1221,另一个光束输出至第二1×2分光器1222。第一1×2分光器1221将接收到的一个光束分为第一子光束和第二子光束,分别向数据接收模块2和子提取单元1223输出。第二1×2分光器1222将接收到的一子光束分为第三子光束和第四子光束,分别向数据接收模块2和子提取单元1223输出。其中,第一子光束的功率大于第二子光束的功率,并且第三子光束的功率大于第四子光束的功率。
子提取单元1223在接收第二子光束时,过滤掉第一波长的光,使得仅提取第二波长的光,并且在接收到第四子光束时,过滤掉第二波长的光,使得仅提取第一波长的光。子提取单元1223检测第二子光束中第二波长的光的功率,并且检测第四子光束中第一波长的光的功率,确定这两个功率之和为目标功率,向第一处理模块123输出目标功率,或者,子提取单元1223向第一处理模块123输出第二子光束中第二波长的光的功率和第四子光束中第一波长的光的功率,目标功率包括该两个功率。另外,目标功率也可以为第二子光束中第二波长的光的功率或第四子光束中第一波长的光的功率。
第一处理模块123按照将目标功率调整为最小值为原则,调整至少一个调相单元121的调相电压。例如,第一处理模块123可以按照预设步长调整调相电压。此处,在目标功率包括第二子光束中第二波长的光的功率和第四子光束中第一波长的光的功率时,目标功率最小指这两个功率均最小。
这样,在第二子光束包括的第二波长的光比较少,且第四子光束包括第一波长的光比较少时,两个波长的本振光分离完成。
可选地,图9提供了偏振控制模块1的另一种结构示意图。参见图9,反馈提取单元122包括第一1×2分光器1221和子提取单元1223。多个调相单元121输出调相处理后的两个光束,一个光束输出至第一1×2分光器1221,另一个光束输出至数据接收模块2。第一1×2分光器1221将接收到的一个光束分为第一子光束和第二子光束,分别向数据接收模块2和子提取单元1223输出。其中,第一子光束的功率大于第二子光束的功率。
子提取单元1223在接收第二子光束时,过滤掉第一波长的光,使得仅提取第二波长的光。
子提取单元1223检测第二子光束中第二波长的光的功率,向第一处理模块123输出该功率。第一处理模块123按照将该功率调整为最小值为原则,调整至少一个调相单元121的调相电压。
这样,在一个光束中第二子光束包括的第二波长的光比较少时,说明另一个光束中第一波长的光也比较少,两个波长的本振光分离完成。另外,反馈提供单元122也可以包括第二1×2分光器1222和子提取单元1223,提取反馈信息的描述参见图8和图9的描述,此处不再赘述。
可选地,子提取单元1223包括光电探测器和模数转换器(analog digital converter,ADC),光电探测器检测到目标功率,ADC将目标功率转换为模拟信号,向第一处理模块123发送模拟信号。第一处理模块123确定调相电压指示信息,向至少一个调相单元121发送调相电压指示信息,该调相电压指示信息可以是以模拟信号的形式发送。
可选地,第一处理模块123可以是现场可编程逻辑门阵列(field programmable gate array,FPGA)或应用型专用集成电路(application-specific integrated circuit,ASCI)等。
示例性的,调制有数据的第三光束的偏振态为正交偏振态,调制有数据的第四光束的偏振态为正交偏振态,在此种情况下图10提供了相干接收装置的结构示意图。参见图10,数据接收模块2包括第二PSR21、第一分波模块22、第二分波模块23、相干接收单元24和第二处理模块25。
第二PSR21接收到第一信号光,将第一信号光分离为第一子信号光和第二子信号光,第一子信号光包括调制有数据的第三光束和调制有数据的第四光束,第二子信号光包括调制有数据的第三光束和调制有数据的第四光束。将第一子信号光和第二子信号光分别传输至第一分波模块22和第二分波模块23。
第一分波模块22将第一子信号光中第一波长的信号光和第二波长的信号光分离,向相干接收单元24输出第一波长的信号光和第二波长的信号光。第二分波模块23将第二子信号光中第一波长的信号光和第二波长的信号光分离,向相干接收单元24输出第一波长的信号光和第二波长的信号光。
相干接收单元24使用第一光束对第一波长的光进行相干接收,获得第一结果,并且使用第二光束对第二波长的光进行相干接收,获得第二结果。相干接收单元24向第二处理模块25输出第一结果和第二结果。
第二处理模块25使用第一结果和第二结果,获得第三光束和第四光束上调制的数据。
可选地,参见图11所示的相干接收装置,相干接收单元24包括第一子相干接收单元241和第二子相干接收单元242。第一子相干接收单元241包括第一分光器、两个混频器和第一光电转换模块。该第一分光器将第一光束分为两束,一束用于与第一分波模块22输出的第一波长的信号光在一个混频器进行混频处理,输出混频处理后的光信号,另一束用于与第二分波模块23输出的第一波长的信号光在另一个混频器进行混频处理,输出混频处理后的光信号。第一光电转换模块将混频处理后的光信号转换为电信号,得到第一结果,将第一结果输出至第二处理模块25。第二子相干接收单元242包括第二分光器、两个混频器和第二光电转换模块。该第二分光器将第二光束分为两束,一束用于与第一分波模块22输出的第二波长的信号光在一个混频器进行混频处理,输出混频处理后的光信号,另一束用于与第二分波模块23输出的第二波长的信号光在另一个混频器进行混频处理,输出混频处理后的光信号,第二光电转换模块将混频处理后的光信号转换为电信号,得到第二结果,将第二结果输出至第二处理模块25。
需要说明的是,第一分波模块22输出的第一波长的信号光与第二分波模块23输出的第一波长的信号光是第一调制器031输出的两路信号光,该两路信号光为调制有数据的第一路子光束和调制有数据的第二路子光束。第一分波模块22输出的第二波长的信号光与第二分波模块23输出的第二波长的信号光是第二调制器032输出的两路信号光,该两路信号光为调制有数据的第三路子光束和调制有数据的第四路子光束。
可选地,参见图11所示的数据接收模块2,第二处理模块25包括跨阻放大器(trans-impedance amplifier,TIA)、ADC和第二DSP。TIA对电信号进行放大处理。ADC将放大处理后的电信号转换为数字信号。第二DSP根据该数字信号获得第三光束和第四光束上调制的数据。
需要说明的是,在第二PSR21、第一分波模块22、第二分波模块23和相干接收单元24通过硅光芯片实现时,第二PSR21将相干发送装置发送的TM模偏振模式的信号光转变为TE模偏振模式的信号光,使得第一信号光能够在硅光芯片内部传输。同理,在偏振控制模块1通过硅光芯片实现时,第一PSR11将相干发送装置发送的TM模偏振模式的本振光转变为TE模偏振模式的本振光,使得本振光能够在硅光芯片内部传输。
还需要说明的是,通过第一PSR11和控制单元12能够将第一波长的本振光和第二波长的本振光分离开的原因为:第一波长的本振光和第二波长的本振光在光纤中传输时,相位角和旋转角会发生改变,调相器1211和2×2光耦合器1212相互配合能够改变相位角和旋转角,所以通过调相器1211和2×2光耦合器1212能够使得第一波长的本振光的相位角和旋转角恢复,并且能够使得第二波长的本振光的相位角和旋转角恢复,因此能够使得第一波长的本振光和第二波长的本振光分离开。
(3)相干通信设备
相干通信设备包括前文中描述的相干接收装置,说明相干通信设备仅具备相干接收功能。或者相干通信设备包括前文中描述的相干发送装置,说明相干通信设备仅具备相干发送功能。或者,相干通信设备是既能使用第一波长和第二波长的光向其他相干通信设备发送数据,也能接收其他通信设备使用第三波长和第四波长的光发送的数据,说明相干通信设备既具备相干发送功能,也具备相干接收功能。
图12提供了相干通信设备的一种结构示意图。参见图12,相干通信设备包括相干接收装置、相干发送装置、用于连接外部通信光纤的连接模块A和用于连接外部通信光纤的连接模块B。
相干发送装置包括光源01、偏振改变模块02和数据发送模块03,相干接收装置包括目标偏振控制模块0001和第一数据接收模块0002。连接模块A分别与偏振改变模块02和第一数据接收模块0002连接,连接模块B分别与数据发送模块03和目标偏振控制模块0001连接。
光源01用于输出第一光束、第二光束、第三光束和第四光束,第一光束和第二光束用作本振光,第三光束和第四光束用作信号光。第一光束和第三光束的波长为第一波长,第二光束和第四光束的波长为第二波长。光源01向偏振改变模块02输出第一光束和第二光束,并且向数据发送模块03输出第三光束与第四光束。
偏振改变模块02将第一光束和第二光束合并为一束偏振态互为正交的第一本振光,向连接模块A输出第一本振光。连接模块A向另一相干接收设备输出第一本振光。
数据发送模块03接收第三光束和第四光束,将数据调制到第三光束和第四光束上,获得第一信号光,第一信号光包括调制有数据的第三光束和调制有数据的第四光束。数据发送模
块03向连接模块B输出第一信号光。连接模块B向另一相干通信设备输出第一信号光。
连接模块B接收另一相干通信设备发送的本振光A,向目标偏振控制模块0001输出本振光A,本振光A包括偏振态互为正交的第五光束(λ3LO)与第六光束(λ4LO),第五光束和第六光束用作本振光。目标偏振控制模块0001能够控制本振光A的偏振态,通过控制本振光A的偏振态,将本振光A分离为第五光束和第六光束。目标偏振控制模块0001向第一数据接收模块0002输出第五光束和第六光束。
连接模块A接收另一相干通信设备发送的第二信号光,向第一数据接收模块0002输出第二信号光,第二信号光包括调制有数据的第七光束(λ3s)和调制有数据的第八光束(λ4s),第七光束和第五光束的波长为第三波长(λ3),第八光束和第六光束的波长为第四波长(λ4)。第一数据接收模块0002将第二信号光分离为调制有数据的第七光束和调制有数据的第八光束。第一数据接收模块0002使用第五光束获取第七光束上调制的数据,并且使用第六光束获取第八光束上调制的数据。
这样,相干通信设备中相干发送装置使用第一波长和第二波长的光向另一相干通信设备发送数据,并且使用第三波长和第四波长的光接收该另一相干通信设备发送的数据,这四个波长不相等。
可选地,第一本振光中第一光束和第二光束的偏振态互为正交。第一信号光中调制有数据的第三光束的偏振态为正交偏振态,调制有数据的第四光束的偏振态为正交偏振态。
可选地,本振光A中第五光束和第六光束的偏振态互为正交。第二信号光中调制有数据的第七光束的偏振态为正交偏振态,调制有数据的第八光束的偏振态为正交偏振态。
对于相干接收装置与相干发送装置的具体结构在前文中有描述,此处不再赘述。
(4)相干通信***
图13提供了相干通信***的结构示意图。参见图13,相干通信***包括前文中描述的相干发送装置和前文中描述的相干接收装置,相干发送装置和相干接收装置通过第一光纤和第二光纤连接。
如前文所述,相干发送装置包括光源01、偏振改变模块02和数据发送模块03。相干接收模块包括偏振控制模块1和数据接收模块2。
其中,光源01用于输出第一光束、第二光束、第三光束和第四光束,第一光束和第二光束用作本振光,第三光束和第四光束用作承载数据的光。第一光束和第三光束的波长为第一波长,第二光束和第四光束的波长为第二波长。光源01向偏振改变模块02输出第一光束和第二光束,并且向数据发送模块03输出第三光束与第四光束。
偏振改变模块02将第一光束和第二光束合并为一束偏振态互为正交的第一本振光,通过连接的第一光纤向相干接收装置输出第一本振光。
数据发送模块03接收第三光束和第四光束,将数据调制到第三光束和第四光束上,获得第一信号光,第一信号光包括调制有数据的第三光束和调制有数据的第四光束。数据发送模块03通过连接的第二光纤向相干接收装置输出第一信号光。
如前文所述相干接收装置,相干接收装置包括偏振控制模块1和数据接收模块2。偏振控制模块1与数据接收模块2之间建立有光通信连接。偏振控制模块1接收相干发送装置输出的第一本振光,第一本振光包括偏振态互为正交的第一光束与第二光束。偏振控制模块1能够控制第一本振光的偏振态,通过控制第一本振光的偏振态,将第一本振光分离为第一光束和第二光束。偏振控制模块1向数据接收模块2输出第一光束和第二光束。
数据接收模块2接收相干发送装置输出的第一信号光,第一信号光包括调制有数据的第
三光束和调制有数据的第四光束。数据接收模块2将第一信号光分离为调制有数据的第三光束和调制有数据的第四光束。数据接收模块2使用第一光束获取第三光束上调制的数据,并且使用第二光束获取第四光束上调制的数据。
对于相干通信***中,相干接收装置和相干发送装置的具体内容参见前文中的描述,此处不再赘述。
图14提供了相干通信***的另一种结构示意图。参见图14,相干通信***包括图12所示的相干通信设备(称为是相干通信设备A)和另一相干通信设备(称为是相干通信设备B)。相干通信设备B的结构与相干通信设备A的结构类似,此处不再赘述。
相干通信设备A与相干通信设备B相对应,即相干通信设备B使用第三波长和第四波长的光向相干通信设备A发送数据,并且接收相干通信设备A使用第一波长和第二波长的光发送的数据。
下面描述使用一个偏振控制模块控制一个波长的偏振态的情况。具体的,按照相干通信***和相干通信设备的顺序进行描述。
(1)相干通信***
图15提供了相干通信***的结构示意图。参见图15,相干通信***包括通过光纤连接的相干发送装置和相干接收装置。相干发送装置包括光源01、第一发送模块10、第二发送模块20、第一连接模块30和第二连接模块40。相干接收装置包括第三连接模块50、第四连接模块60、第一偏振控制模块70、第二偏振控制模块80、第一接收模块90和第二接收模块100。
其中,光源01用于输出第一光束、第二光束、第三光束和第四光束,第一光束和第二光束用作本振光,第三光束和第四光束用作承载数据的光。第一光束和第三光束的波长为第一波长,第二光束和第四光束的波长为第二波长。光源01向第一连接模块30分别输出第一光束和第二光束。并且光源01向第一发送模块10输出第三光束,向第二发送模块20输出第四光束。
第一连接模块30分别输出第一光束和第二光束。第一光束和第二光束通过第一连接模块30连接的一根外部光纤输出。
第一发送模块10将数据调制到第三光束上,获得第一信号光,向第二连接模块40输出第一信号光。第二发送模块20将数据调制到第四光束上,获得第二信号光,向第二连接模块40输出第二信号光。
第二连接模块40分别输出第一信号光和第二信号光。第一信号光和第二信号光通过第二连接模块40连接的一根外部光纤输出。
第三连接模块50接收第一光束和第二光束,向第一偏振控制模块70输出第一光束,并且向第二偏振控制模块80输出第二光束。
第一偏振控制模块70将第一光束分为第一分量和第二分量,控制第一分量和第二分量的功率差值小于或等于参考数值,参考数值比较小。例如,第一分量和第二分量的功率差值为0。第四连接模块60接收第一信号光,向第一接收模块90输出第一信号光。第一接收模块90将第一信号光分为两路子信号光,使用第一光束的第一分量和第二分量分别获取该两路子信号光上调制的数据。
第二偏振控制模块80将第二光束分为第一分量和第二分量,控制第一分量和第二分量的功率差值小于或等于参考数值,参考数值比较小。例如,第一分量和第二分量的功率差值为0。第四连接模块60接收第二信号光,向第二接收模块100输出第二信号光。第二接收模块100将第二信号光分为两路子信号光,使用第二光束的第一分量和第二分量分别获取该两路
子信号光上调制的数据。
这样,对于两个波长的偏振态,使用两个偏振控制模块分别进行控制,第一分量和第二分量的功率差值比较小,使得第一信号光中的两路子信号光均能被接收,并且使得第二信号光的两路子信号光均能被接收。
示例性的,图16提供了第一发送模块10的结构示意图。参见图16,第一发送模块10包括第三处理模块101、第一调制器031和PSR035。第三处理模块101向第一调制器031发送数据。第一调制器031接收第三光束,将第三光束分为第一子光束和第二子光束,将数据分别调制到第一子光束和第二子光束上。第一调制器031向PSR035输出调制有数据的第一子光束和调制有数据的第二子光束。此处第一子光束与第二子光束的功率可以相等,也可以不相等。
PSR035将调制有数据的第一子光束的偏振态旋转为第一偏振态,第一偏振态与调制有数据的第二子光束的偏振态正交,合并调整偏振态后的第一子光束和调制有数据的第二子光束为一束,得到第一本振光。这样,调制有数据的第一子光束与调制有数据的第二子光束的偏振态正交,光纤中能够传输两个偏振态的数据,使得光传输通道的利用率比较高。
可选地,第三处理模块101包括第一DSP、DAC和驱动电路。第一DSP提供数据的数字信号,传输给DAC。DAC用于将数字信号转换为模拟信号,传输给驱动电路。驱动电路用于将模拟信号转换为电信号,传输给第一调制器031。
示例性的,图17提供了第二发送模块20的结构示意图。参见图17,第二发送模块20包括第四处理模块201、第二调制器032和第四PSR202。第四处理模块201向第二调制器032发送数据。第二调制器032接收第四光束,将第四光束分为第三子光束和第四子光束,将数据分别调制到第三子光束和第四子光束上。第二调制器032向第四PSR202输出调制有数据的第三子光束和调制有数据的第四子光束。此处第三子光束与第四子光束的功率可以相等,也可以不相等。
第四PSR202将调制有数据的第三子光束的偏振态旋转为第一偏振态,第一偏振态调制有数据的第四子光束的偏振态正交,合并调整偏振态后的第三子光束和调制有数据的第四子光束为一束,得到第二信号光。这样,调制有数据的第三子光束与调制有数据的第四子光束的偏振态正交,光纤中能够传输两个偏振态的数据,使得光传输通道的利用率比较高。
此处,第一偏振态可以为TM模偏振模式,与第一偏振态正交的偏振态为TE模偏振模式。
可选地,第四处理模块201包括第二DSP、DAC和驱动电路。第二DSP提供数据的数字信号,传输给DAC。DAC用于将数字信号转换为模拟信号,传输给驱动电路。驱动电路用于将模拟信号转换为电信号,传输给第二调制器032。
需要说明的是,第一信号光中调制有数据的第三光束的偏振态正交,第一光束的第一分量用于接收调制有的数据的第三光束的一个偏振态的数据,即第一子光束上调制的数据,第二分量用于接收调制有的数据的第三光束的另一个偏振态的数据,即第二子光束上调制的数据。第二信号光中调制有数据的第四光束的偏振态正交,第二光束的第一分量用于接收调制有的数据的第四光束的一个偏振态的数据,即第三子光束上调制的数据,第二分量用于接收调制有的数据的第四光束的另一个偏振态的数据,即第四子光束上调制的数据。
示例性的,第一偏振控制模块70接收到第一光束后,将第一光束分为两个子光束,对该两个子光束进行调相处理,使得调相处理后的两个子光束的功率差值小于或等于参考数值。
可选地,图18提供了第一偏振控制模块70的结构示意图。参见图18,第一偏振控制模
块70包括第一PSR11和控制单元12,第一PSR11接收第一光束,将第一光束分为两个子光束。控制单元12对两个子光束进行调相处理,即对两个子光束的相位进行调整,从调相处理后的至少一个子光束中提取反馈信息,该反馈信息可以是光功率等,并向第一接收模块90输出调相处理后的两个子光束。控制单元12使用该反馈信息,调整进行调相处理的调相电压,通过调整后的调相电压,控制调相处理后的两个子光束的功率差值小于或等于参考数值。
可选地,控制单元12包括M个调相单元121、反馈提取单元122和第一处理模块123,M大于或等于1。例如,M取值为2。M个调相单元121对第一PSR11输出的两个子光束进行调相处理,向第一接收模块90输出调相处理后的两个子光束。反馈提取单元122从调相处理后的至少一个子光束中提取反馈信息。第一处理模块123使用该反馈信息,确定至少一个调相单元121的调相电压,使用调整后的调相电压控制调相单元121,使得调相处理后的两个子光束的功率差值小于或等于参与数值。
或者,该控制单元12包括第一2×2光耦合器、M个调相单元121、反馈提取单元122和第一处理模块123,M大于或等于1。该第一2×2光耦合器用于接收第一PSR11输出的两个子光束,调整该两个子光束的旋转角,输出两个子光束,该M个调相单元121用于对该2×2光耦合器输出的两个子光束进行调相处理,向第一接收模块90输出调相处理后的两个子光束。反馈提取单元122从调相处理后的至少一个子光束中提取反馈信息。第一处理模块123使用该反馈信息,确定至少一个调相单元121的调相电压,使用调整后的调相电压控制调相单元121,使得调相处理后的两个子光束的功率差值小于或等于参考数值。
需要说明的是,M个调相单元121的介绍参见前文中调相单元121的描述,此处不再赘述。
可选地,图19提供了第一偏振控制模块70的结构示意图。参见图19,反馈提取单元122包括第一1×2分光器1221、第二1×2分光器1222和子提取单元1223。多个调相单元121输出调相处理后的两个子光束,一个子光束输出至第一1×2分光器1221,另一个子光束输出至第二1×2分光器1222。第一1×2分光器1221将接收到的子光束分为第一子光束和第二子光束,分别向第一接收模块90和子提取单元1223输出。第二1×2分光器1222将接收到的子光束分为第三子光束和第四子光束,分别向第一接收模块90和子提取单元1223输出。其中,第一子光束的功率大于第二子光束功率,并且第三子光束的功率大于第四子光束的功率,第一子光束与第二子光束的功率的比值等于第三子光束与第四子光束的功率的比值。
子提取单元1223检测第二子光束的功率,并且检测第四子光束的功率,计算第二子光束和第四子光束的功率差值,向第一处理模块123输出该功率差值。或者子提取单元1223向第一处理模块123输出第二子光束的功率和第四子光束的功率。
第一处理模块123按照以将该功率差值调整为小于或等于参考数值为原则,调整至少一个调相单元121的调相电压。
这样,第一分量和第二分量的功率差值比较小,说明第一分量和第二分量的功率比较接近,能够使得同一波长的两路本振光的功率均衡。
可选地,图20提供了第一偏振控制模块70的另一种结构示意图。参见图20,反馈提取单元122包括第一1×2分光器1221和子提取单元1223。多个调相单元121输出调相处理后的两个子光束,一个子光束输出至第一1×2分光器1221,另一个子光束输出至第一接收模块90。第一1×2分光器1221将接收到的一子光束分为第一子光束和第二子光束,分别向第一接收模块90和子提取单元1223输出。其中,第一子光束的功率大于第二子光束功率。
子提取单元1223接收第二子光束,检测第二子光束的功率,向第一处理模块123输出该
功率。第一处理模块123按照将该功率调整为目标数值的原则,调整至少一个调相单元121的调相电压。其中,目标数值为第一子光束和第二子光束总功率的一半,这样,将第二子光束的功率调整为目标数值,那么第一子光束的功率也接近目标数值。
另外,反馈提取单元122也可以包括第二1×2分光器1222和子提取单元1223,提取第四子光束的功率,具体描述参见图19和图20中的描述。
可选地,子提取单元1223包括光电探测器和ADC,光电探测器检测到功率,ADC将功率转换为模拟信号,向第一处理模块123发送模拟信号。第一处理模块123确定调相电压指示信息,向至少一个调相单元121发送调相电压指示信息,该调相电压指示信息可以以模拟信号的形式发送。
示例性的,调制有数据的第三光束的偏振态为正交偏振态,图21提供了第一接收模块90的结构示意图。参见图21,第一接收模块90包括第二PSR21、第一相干接收单元901和第二处理模块25。第一相干接收单元901包括混频器1、混频器2和光电转换模块C。
第二PSR21接收到第一信号光,将第一信号光分离为第一子信号光和第二子信号光,第一子信号光为接收到的第一信号光中一个偏振态的信号光,第二子信号光为第一信号光中另一个偏振态的信号光,该一个偏振态与该另一个偏振态正交,第一子信号光包括调制有数据的第三光束,第二子信号光包括调制有数据的第三光束。将第一子信号光和第二子信号光分别传输至第一相干接收单元901。第一相干接收单元901将第一光束的第一分量与第一子信号光输入混频器1,进行混频处理,将混频处理后的光信号输出至光电转换模块C,获得第一结果,第一结果为电信号。并且将第一光束的第二分量与第二子信号光输入混频器2,进行混频处理,将混频处理后的光信号输出至光电转换模块C,获得第二结果,第二结果为电信号。第一相干接收单元901向第二处理模块25发送第一结果和第二结果。第二处理模块25使用第一结果和第二结果,获得第三光束上调制的数据。
可选地,参见图21所示的第一接收模块90,第二处理模块25包括TIA、ADC和第三DSP。TIA对电信号进行放大处理。ADC将放大处理后的电信号转换为数字信号。第三DSP根据该数字信号获得第三光束上调制的数据。
需要说明的是,在第二PSR21和第一相干接收单元901通过硅光芯片实现时,第二PSR21将相干发送装置发送的TM模偏振模式的信号光转变为TE模偏振模式的信号光,使得第一信号光能够在硅光芯片传输。
示例性的,第二偏振控制模块80接收到第二光束后,将第二光束分为两个子光束,对该两个子光束进行调相处理,使得调相处理后的两个子光束的功率差值小于或等于参考数值。
可选地,图22提供了第二偏振控制模块80的结构示意图。参见图22,第二偏振控制模块80包括第五PSR801和第一控制单元802,第五PSR801接收第二光束,将第二光束分为两个子光束。第一控制单元802对两个子光束进行调相处理,即对两个子光束的相位进行调整,从调相处理后的至少一个子光束中提取反馈信息,该反馈信息可以是光功率等,并向第二接收模块100输出调相处理后的两个子光束。第一控制单元802使用该反馈信息,调整进行调相处理的调相电压,通过调整后的调相电压,控制调相处理后的两个子光束的功率差值小于或等于参考数值。
可选地,第一控制单元802包括M个调相单元121、反馈提取单元122和第五处理模块8021,M大于或等于1。例如,M取值为2。
M个调相单元121对第五PSR801输出的两个子光束进行调相处理,向第二接收模块100输出调相处理后的两个子光束。反馈提取单元122从调相处理后的至少一个子光束中提取反
馈信息。第五处理模块8021使用该反馈信息,确定至少一个调相单元121的调相电压,使用调整有的调相电压控制调相单元121,使得调相处理后的两个子光束的功率差值小于或等于参与数值。
需要说明的是,M个调相单元121的介绍参见前文中的描述,此处不再赘述。反馈提取单元122的结构与图19和图20所示的反馈提取单元122的结构相同,此处不再赘述。
可选地,该第一控制单元802还可以包括第一2×2光耦合器,第一2×2光耦合器位于M个调相单元121之前,且与M个调相单元121相邻,具体连接关系参见前文中的描述。
示例性的,调制有数据的第四光束的偏振态为正交偏振态,在此种情况下图23提供了第二接收模块100的结构示意图。参见图23,第二接收模块100包括第六PSR1001、第二相干接收单元102和第六处理模块103。第二相干接收单元102包括混频器A、混频器B和光电转换模块D。
第六PSR1001接收到第二信号光,将第二信号光分离为第三子信号光和第四子信号光,第三子信号光为第二信号光中一个偏振态的信号光,第四子信号光为第二信号光中另一个偏振态的信号光,该一个偏振态与该另一个偏振态正交,第三子信号光包括调制有数据的第四光束,第四子信号光包括调制有数据的第四光束。将第三子信号光和第四子信号光分别传输至第二相干接收单元102。第二相干接收单元102将第二光束的第一分量与第三子信号光输入混频器A,进行混频处理,将混频处理后的光信号输出至光电转换模块D,获得第三结果,第三结果为电信号。并且将第二光束的第二分量与第四子信号光输入混频器B,进行混频处理,将混频处理后的光信号输出至光电转换模块,获得第四结果,第四结果为电信号。第二相干接收单元102向第六处理模块103发送第三结果和第四结果。第六处理模块103使用第三结果和第四结果,获得第四光束上调制的数据。
可选地,参见图23所示的第二接收模块100,第六处理模块103包括TIA、ADC和第四DSP。TIA对电信号进行放大处理。ADC将放大处理后的电信号转换为数字信号。第四DSP根据该数字信号获得第四光束上调制的数据。
需要说明的是,在第六PSR1001和第二相干接收单元102通过硅光芯片实现时,第六PSR1001将相干发送装置发送的TM模偏振模式的信号光转变为TE模偏振模式的信号光,使得第二信号光能够在硅光芯片传输。
(2)相干通信设备
相干通信设备既能使用第一波长和第二波长的光向其他相干通信设备发送数据,也能接收其他通信设备使用第三波长和第四波长的光发送的数据。
图24提供了相干通信设备的结构示意图。参见图24,相干通信设备包括相干发送装置、相干接收装置、第一连接模块30和第二连接模块40。相干发送装置包括光源01、第一发送模块10、第二发送模块20、第一连接模块30和第二连接模块40。相干接收装置包括第三偏振控制模块001、第四偏振控制模块002、第三接收模块003和第四接收模块004。
其中,光源01向第二连接模块40输出第一光束和第二光束,光源01向第一发送模块10输出第三光束,向第二发送模块20输出第四光束。第一光束和第三光束的波长为第一波长,第二光束和第四光束的波长为第二波长。
第二连接模块40分别输出第一光束和第二光束。第一光束和第二光束通过第二连接模块40连接的一根外部光纤输出。
第一发送模块10将数据调制到第三光束上,获得第一信号光,向第一连接模块30输出第一信号光。第二发送模块20将数据调制到第四光束上,获得第二信号光,向第一连接模块
30输出第二信号光。
第一连接模块30分别输出第一信号光和第二信号光。第一本振光和第二信号光通过第一连接模块30连接的一根外部光纤输出。
第二连接模块40接收第二本振光和第三本振光,第二本振光的波长为第三波长,第三本振光的波长为第四波长。第二连接模块40向第三偏振控制模块001发送第二本振光,并且向第四偏振控制模块002发送第三本振光。
第三偏振控制模块001将第二本振光分为第一分量和第二分量,控制第一分量和第二分量的功率差值小于或等于参考数值,参考数值比较小。第一连接模块30接收第三信号光,第三信号光的波长为第三波长。第一连接模块30向第三接收模块003发送第三信号光。第三接收模块003将第三信号光分为两路子信号光,使用第二本振光的第一分量和第二分量分别获取该两路子信号光上调制的数据。
第四偏振控制模块002将第三本振光分为第一分量和第二分量,控制第一分量和第二分量的功率差值小于或等于参考数值,参考数值比较小。第一连接模块30接收第四信号光,第四信号光的波长的第四波长。第一连接模块30向第四接收模块004发送第四信号光。第四接收模块004将第四信号光分为两路子信号光,使用第三本振光的第一分量和第二分量分别获取该两路子信号光上调制的数据。
这样,相干通信设备中相干发送装置使用第一波长和第二波长的光向另一相干通信设备发送数据,并且使用第三波长和第四波长的光接收该另一相干通信设备发送的数据,这四个波长不相等。
在图24中对于相干接收装置与相干发送装置的具体结构在前文中有描述,此处不再赘述。
在图24所示的相干通信设备的基础上,本申请实施例还提供了图25所示的相干通信***。参见图25,相干通信设备A和相干通信设备B进行通信。相干通信设备A使用第一波长和第二波长的光向相干通信设备B发送数据,相干通信设备B使用相干通信设备A发送的第一波长和第二波长的本振光接收该相干通信设备A发送的数据。相干通信设备B使用第三波长和第四波长的光向该相干通信设备A发送数据,相干通信设备A使用相干通信设备B发送的第三波长和第四波长的本振光接收相干通信设备B发送的数据。
在图25中,相干接收装置与相干发送装置的具体结构在前文中有描述,此处不再赘述。
本申请实施例中,针对双波相长干通信***,给出了同源相干***架构的设计以及本振光的跟踪和控制方式。
需要说明的是,上述各个模块,在不违反逻辑的前提下能够任意组合。
本申请中术语“第一”、“第二”等字样用于对作用和功能基本相同的相同项或相似项进行区分,应理解,“第一”、“第二”之间不具有逻辑或时序上的依赖关系,也不对数量和执行顺序进行限定。还应理解,尽管以下描述使用术语第一、第二等来描述各种元素,但这些元素不应受术语的限制。这些术语只是用于将一元素与另一元素区别分开。例如,在不脱离各种示例的范围的情况下,第一光束可以被称为第二光束,并且类似地,第二光束可以被称为第一光束。第一光束和第二光束都可以是光束,并且在某些情况下,可以是单独且不同的本振光。
本申请中术语“至少一个”的含义是指一个或多个,本申请中术语“多个”的含义是指两个或两个以上。
以上描述,仅为本申请的具体实施方式,但本申请的保护范围并不局限于此,任何熟悉
本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到各种等效的修改或替换,这些修改或替换都应涵盖在本申请的保护范围之内。因此,本申请的保护范围应以权利要求的保护范围为准。
Claims (16)
- 一种相干接收装置,其特征在于,包括偏振控制模块(1)和数据接收模块(2);所述偏振控制模块(1)用于,接收第一本振光,所述第一本振光包括偏振态互为正交的第一光束和第二光束,所述第一光束的波长为第一波长,所述第二光束的波长为第二波长;通过控制所述第一本振光的偏振态,将所述第一本振光分为所述第一光束和所述第二光束;所述数据接收模块(2)用于,接收第一信号光,所述第一信号光包括调制有数据的第三光束和调制有数据的第四光束,所述第三光束的波长为所述第一波长,所述第四光束的波长为所述第二波长;使用所述第一光束获取所述第三光束上调制的数据,使用所述第二光束获取所述第四光束上调制的数据。
- 根据权利要求1所述的相干接收装置,其特征在于,所述偏振控制模块(1)用于:将所述第一本振光分为两个光束;对所述两个光束进行调相处理,使得调相处理后的两个光束分别为所述第一光束和所述第二光束。
- 根据权利要求2所述的相干接收装置,其特征在于,所述偏振控制模块(1)包括第一偏振分束旋转器PSR(11)和控制单元(12);所述第一PSR(11)用于,接收第一本振光,将所述第一本振光分为两个光束;所述控制单元(12)用于,对所述两个光束进行调相处理,向所述数据接收模块(2)输出调相处理后的两个光束;从调相处理后的至少一个光束中提取反馈信息;基于所述反馈信息,调整进行调相处理的调相电压,使得调相处理后的两个光束分别为所述第一光束和所述第二光束。
- 根据权利要求3所述的相干接收装置,其特征在于,所述控制单元(12)包括N个调相单元(121)、反馈提取单元(122)和第一处理模块(123),N大于或等于1;所述N个调相单元(121)用于,对所述第一PSR(11)输出的两个光束进行调相处理,向所述数据接收模块(2)输出调相处理后的两个光束;所述反馈提取单元(122)用于,从调相处理后的至少一个光束中提取反馈信息;所述第一处理模块(123)用于,基于所述反馈信息,调整所述N个调相单元(121)中至少一个调相单元(121)的调相电压,使得调相处理后的两个光束分别为所述第一光束和所述第二光束。
- 根据权利要求4所述的相干接收装置,其特征在于,所述N个调相单元(121)中第1个至第N个调相单元(121)沿着本振光传输方向依次排布,N大于1;每个调相单元(121)包括调相器(1211)和2×2光耦合器(1212);第1个调相单元(121)中调相器(1211)的输入端口和输出端口分别与所述第一PSR(11)的一个输出端口、所述第1个调相单元(121)中2×2光耦合器(1212)的第一输入端口连接;所述第1个调相单元(121)中2×2光耦合器(1212)的第二输入端口与所述第一PSR(11)的另一个输出端口连接;第i-1个调相单元(121)中2×2光耦合器(1212)的两个输出端口分别与第i个调相单元(121)中调相器(1211)的输入端口、2×2光耦合器(1212)的第一输入端口连接;所述第i-1个调相单元(121)中调相器(1211)的输出端口与2×2光耦合器(1212)的第二输入端口连接,i大于1,且小于或等于N;所述第N个调相单元(121)中2×2光耦合器(1212)的两个输出端口分别与所述反馈提取单元(122)连接;所述第一处理模块(123),用于基于所述反馈信息,调整所述至少一个调相单元(121)中调相器(1211)的调相电压。
- 根据权利要求4或5所述的相干接收装置,其特征在于,所述反馈提取单元(122)包括第一1×2分光器(1221)、第二1×2分光器(1222)和子提取单元(1223);所述N个调相单元(121)用于,分别向所述第一1×2分光器(1221)和所述第二1×2分光器(1222)输出调相处理后的两个光束;所述第一1×2分光器(1221)用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向所述数据接收模块(2)和所述子提取单元(1223)输出;所述第二1×2分光器(1222)用于,将调相处理后的另一个光束分为第三子光束和第四子光束,分别向所述数据接收模块(2)和所述子提取单元(1223)输出;所述子提取单元(1223)用于,确定目标功率,所述目标功率包括所述第二子光束中所述第二波长的光和所述第四子光束中所述第一波长的光的功率之和,或者包括所述第二子光束中所述第二波长的光的功率和所述第四子光束中所述第一波长的光的功率;所述第一处理模块(123)用于,以将所述目标功率调整为最小值为原则,调整所述至少一个调相单元(121)的调相电压,以使所述第一子光束的波长为所述第一波长,所述第三子光束的波长为所述第二波长。
- 根据权利要求4所述的相干接收装置,其特征在于,所述反馈提取单元(122)包括第一1×2分光器(1221)和子提取单元(1223);所述N个调相单元(121)用于,分别向所述第一1×2分光器(1221)和所述数据接收模块(2)输出调相处理后的两个光束;所述第一1×2分光器(1221)用于,将接收到的光束分为第一子光束和第二子光束,分别向所述数据接收模块(2)和所述子提取单元(1223)输出;所述子提取单元(1223)用于,确定所述第二子光束中所述第二波长的光的功率;所述第一处理模块(123)用于,以将所述功率调整为最小值为原则,调整所述至少一个调相单元(121)的调相电压,以使所述第一子光束的波长为所述第一波长。
- 根据权利要求1至7任一项所述的相干接收装置,其特征在于,调制有数据的第三光束的偏振态为正交偏振态,调制有数据的第四光束的偏振态为正交偏振态;所述数据接收模块(2)包括第二PSR(21)、第一分波模块(22)、第二分波模块(23)、相干接收单元(24)和第二处理模块(25);所述第二PSR(21)用于,接收所述第一信号光,将所述第一信号光分为第一子信号光和第二子信号光;所述第一分波模块(22)用于,将所述第一子信号光分为所述第一波长的信号光和所述第二波长的信号光;所述第二分波模块(23)用于,将所述第二子信号光分为所述第一波长的信号光和所述第二波长的信号光;所述相干接收单元(24)用于,使用所述第一光束,对所述第一波长的信号光进行相干接收,获得第一结果,并使用所述第二光束,对所述第二波长的信号光进行相干接收,获得 第二结果;所述第二处理模块(25)用于,基于所述第一结果和所述第二结果,获得所述第三光束和所述第四光束上调制的数据。
- 一种相干发送装置,其特征在于,包括光源(01)、偏振改变模块(02)和数据发送模块(03);所述光源(01)用于,输出第一光束、第二光束、第三光束和第四光束,所述第一光束和所述第三光束的波长为第一波长,所述第二光束和所述第四光束的波长为第二波长;所述偏振改变模块(02)用于,将所述第一光束和所述第二光束合并为一束偏振态互为正交的第一本振光,输出所述第一本振光;所述数据发送模块(03)用于,将数据调制到所述第三光束和所述第四光束上,获得第一信号光,输出所述第一信号光。
- 根据权利要求9所述的相干发送装置,其特征在于,所述数据发送模块(03)包括处理模块(030)、第一调制器(031)、第二调制器(032)、第一合波模块(033)、第二合波模块(034)和偏振分束旋转器PSR(035);所述处理模块(030)用于,提供所述数据;所述第一调制器(031)用于,将所述第三光束分为第一路子光束和第二路子光束,将数据分别调制到所述第一路子光束和所述第二路子光束上;所述第二调制器(032)用于,将所述第四光束分为第三路子光束和第四路子光束,将数据分别调制到所述第三路子光束和所述第四路子光束上;所述第一合波模块(033),用于将调制有数据的所述第一路子光束和调制有数据的所述第三路子光束合并为第一子信号光;所述第二合波模块(034),用于将调制有数据的所述第二路子光束和调制有数据的所述第四路子光束合并为第二子信号光;所述PSR(035)用于,调整所述第一子信号光的偏振态为与所述第二子信号光的偏振态正交的偏振态,合并调整偏振态后的所述第一子信号光和所述第二子信号光,得到所述第一信号光。
- 一种相干通信***,其特征在于,包括通过光纤连接的相干发送装置和相干接收装置,所述相干发送装置包括光源(01)、偏振改变模块(02)和数据发送模块(03),所述相干接收装置包括偏振控制模块(1)和数据接收模块(2);所述光源(01)用于,输出第一光束、第二光束、第三光束和第四光束,所述第一光束和所述第三光束的波长为第一波长,所述第二光束和所述第四光束的波长为第二波长;偏振改变模块(02)用于,将所述第一光束和所述第二光束合并为一束偏振态互为正交的第一本振光,输出所述第一本振光;所述数据发送模块(03)用于,将数据调制到所述第三光束和所述第四光束上,获得第一信号光,输出所述第一信号光;所述偏振控制模块(1)用于,接收所述第一本振光;通过控制所述第一本振光的偏振态,将所述第一本振光分为所述第一光束和所述第二光束;所述数据接收模块(2)用于,接收所述第四光束;使用所述第一光束获取所述第三光束上调制的数据,使用所述第二光束获取所述第四光束上调制的数据。
- 根据权利要求11所述的相干通信***,其特征在于,所述偏振控制模块(1)用于:将所述第一本振光分为两个光束;对所述两个光束进行调相处理,使得调相处理后的两个光束分别为所述第一光束和所述第二光束。
- 根据权利要求12所述的相干通信***,其特征在于,所述偏振控制模块(1)包括第一偏振分束旋转器PSR(11)和控制单元(12);所述第一PSR(11)用于,接收第一本振光,将所述第一本振光分为两个光束;所述控制单元(12)用于,对所述两个光束进行调相处理,向所述数据接收模块(2)输出调相处理后的两个光束;从调相处理后的至少一个光束中提取反馈信息;基于所述反馈信息,调整进行调相处理的调相电压,使得调相处理后的两个光束分别为所述第一光束和所述第二光束。
- 根据权利要求13所述的相干通信***,其特征在于,所述控制单元(12)包括N个调相单元(121)、反馈提取单元(122)和第一处理模块(123),N大于或等于1;所述N个调相单元(121)用于,对所述第一PSR(11)输出的两个光束进行调相处理,向所述数据接收模块(2)输出调相处理后的两个光束;所述反馈提取单元(122)用于,从调相处理后的至少一个光束中提取反馈信息;所述第一处理模块(123)用于,基于所述反馈信息,调整所述N个调相单元(121)中至少一个调相单元(121)的调相电压,使得调相处理后的两个光束分别为所述第一光束和所述第二光束。
- 根据权利要求14所述的相干通信***,其特征在于,所述反馈提取单元(122)包括第一1×2分光器(1221)、第二1×2分光器(1222)和子提取单元(1223);所述N个调相单元(121)用于,分别向所述第一1×2分光器(1221)和所述第二1×2分光器(1222)输出调相处理后的两个光束;所述第一1×2分光器(1221)用于,将调相处理后的一个光束分为第一子光束和第二子光束,分别向所述数据接收模块(2)和所述子提取单元(1223)输出;所述第二1×2分光器(1222)用于,将调相处理后的另一个光束分为第三子光束和第四子光束,分别向所述数据接收模块(2)和所述子提取单元(1223)输出;所述子提取单元(1223)用于,确定目标功率,所述目标功率包括所述第二子光束中所述第二波长的光和所述第四子光束中所述第一波长的光的功率之和,或者包括所述第二子光束中所述第二波长的光的功率和所述第四子光束中所述第一波长的光的功率;所述第一处理模块(123)用于,以将所述目标功率调整为最小值为原则,调整所述至少一个调相单元(121)的调相电压,以使所述第一子光束的波长为所述第一波长,所述第三子光束的波长为所述第二波长。
- 根据权利要求14所述的相干通信***,其特征在于,所述反馈提取单元(122)包括第一1×2分光器(1221)和子提取单元(1223);所述N个调相单元(121)用于,分别向所述第一1×2分光器(1221)和所述数据接收模块(2)输出调相处理后的两个光束;所述第一1×2分光器(1221)用于,将接收到的光束分为第一子光束和第二子光束,分别向所述数据接收模块(2)和所述子提取单元(1223)输出;所述子提取单元(1223)用于,确定所述第二子光束中所述第二波长的光的功率;所述第一处理模块(123)用于,以将所述功率调整为最小值为原则,调整所述至少一个调相单元(121)的调相电压,以使所述第一子光束的波长为所述第一波长。
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