Optical signal transceiver, control method and optical communication system

Abstract

The embodiment of the invention provides optical signal receiving and transmitting equipment, a control method and an optical communication system, which are applied to the technical field of optical communication. The optical signal transceiver comprises a transmitter, a receiver, a reference light source and a control circuit. Wherein the reference light source is used for outputting a reference light signal; the receiver is configured to receive the first optical signal. And performing frequency beating on the first optical signal according to the reference optical signal. And the transmitter is used for modulating the reference optical signal to obtain a second optical signal and transmitting the second optical signal. The control circuit is used for outputting a first control signal to the reference light source according to the frequency difference between the reference light signal and the first light signal. The first control signal is used for adjusting the frequency of the reference optical signal so as to control the frequency difference between the first optical signal and the second optical signal to be smaller than a first threshold value. According to the scheme, frequency alignment between the first optical signal and the second optical signal is achieved under the condition that a single light source is used for coherent optical transmission.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to an optical signal transceiver device, a control method and an optical communication system. Background Art

[0002] Coherent optical transmission is an important means for optical transmission networks to carry out long-distance transmission. In an optical communication system, multiple optical signal transceiver devices can be connected by optical fibers. Each optical signal transceiver device includes a first light source, a receiver, a second light source and a transmitter. Among them, the first light source is used to provide a local oscillator optical signal to the receiver, and the receiver beats the received first optical signal through the local oscillator optical signal to obtain the data information carried on the first optical signal. The second light source is used to provide a carrier optical signal to the transmitter, and the transmitter can obtain a second optical signal carrying data information by coherently modulating the carrier optical signal. Optical communication is achieved between multiple optical signal transceiver devices through coherent optical transmission of the first optical signal and the second optical signal. However, two light sources need to be set in each optical signal transceiver device, which makes the cost of coherent optical transmission high.

[0003] One way to reduce the cost of coherent optical transmission is to set a reference light source in each optical signal transceiver. The reference light source is used to output a reference light signal. The reference light signal is used as a local oscillator light signal and a carrier light signal in the related optical transmission. This solution realizes coherent optical transmission through a single light source to reduce costs. However, in the case of coherent optical transmission with a single light source, how to achieve frequency alignment between the first light signal and the second light signal is a problem. Summary of the invention

[0004] The embodiments of the present application provide an optical signal transceiver device, a control method, and an optical communication system, which achieve frequency alignment between a first optical signal and a second optical signal when a single light source is used for coherent optical transmission.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, an optical signal transceiver device is provided, which includes a transmitter, a receiver, a reference light source, and a control circuit. The reference light source is used to output a reference light signal. The receiver is used to receive a first light signal and beat the first light signal according to the reference light signal. The transmitter is used to modulate the reference light signal to obtain a second light signal and transmit the second light signal. The control circuit is used to output a first control signal to the reference light source according to the frequency difference between the reference light signal and the first light signal. The first control signal is used to adjust the frequency of the reference light signal to control the frequency difference between the first light signal and the second light signal to be less than a first threshold.

[0007] In an embodiment of the present application, a reference light source is used to provide a reference light signal to a transmitter and a receiver respectively. The receiver uses the reference light signal as a local oscillator light signal to beat the first light signal. The transmitter uses the reference light signal as a carrier light signal and coherently modulates the reference light signal to obtain a second light signal. Therefore, the reference light signal has the same frequency as the second light signal. Compared with the scheme of using two light sources to provide a carrier light signal and a local oscillator light signal respectively, the embodiment of the present application provides a carrier light signal and a local oscillator light signal respectively through a reference light source, which can reduce the cost of the device. On this basis, since the frequencies of the reference light signal and the second light signal are consistent, the frequency of the reference light signal can be adjusted according to the frequency difference between the reference light signal and the first light signal to adjust the frequency of the second light signal, thereby controlling the frequency difference between the first light signal and the second light signal to be less than the first threshold. The above scheme can be used to achieve bilateral frequency deviation alignment on the receiving side and the transmitting side when a single light source is used for coherent optical transmission.

[0008] In a possible implementation, the control circuit may determine the frequency difference between the reference optical signal and the first optical signal based on the electrical signal:

[0009] In some examples, the input end of the control circuit is coupled to the output end of the receiver. The receiver is specifically used to: beat the first optical signal according to the reference optical signal to obtain a first electrical signal. The first electrical signal is used to indicate the frequency difference between the reference optical signal and the first optical signal. The control circuit is specifically used to: output a first control signal to the reference light source according to the first electrical signal. In an embodiment of the present application, the receiver beats the reference optical signal and the first optical signal to obtain a first electrical signal. The first electrical signal can indicate the frequency difference between the reference optical signal and the first optical signal. The control circuit performs data processing on the first electrical signal to obtain the frequency difference between the reference optical signal and the first optical signal.

[0010] In some examples, the control circuit includes a data processor and a controller; wherein: the data processor is used to: output a first indication signal to the controller according to the first electrical signal. The first indication signal is used to indicate the frequency difference between the first optical signal and the second optical signal. The controller is used to: output a first control signal to the reference light source according to the first indication signal. In an embodiment of the present application, the first electrical signal can be processed by the data processor to obtain the frequency difference between the reference optical signal and the first optical signal. The first indication signal is obtained according to the frequency difference between the reference optical signal and the first optical signal, and the frequency difference between the first optical signal and the second optical signal is indicated by the first indication signal. After receiving the first indication signal, the controller generates a first control signal according to the first indication signal.

[0011] In some examples, at least one of the multiple parameters of the first electrical signal is used to indicate the frequency difference between the reference optical signal and the first optical signal; the multiple parameters of the first electrical signal include: the phase of the first electrical signal, the current magnitude of the first electrical signal, and the voltage magnitude of the first electrical signal. In an embodiment of the present application, the control circuit can obtain the frequency difference between the first optical signal and the reference optical signal according to the phase change of the first electrical signal. In addition, in the process based on the receiver beat frequency, the voltage magnitude of the generated first electrical signal is related to the optical power magnitude of the optical signal before the beat frequency, and the optical power magnitude of the optical signal can be obtained according to the voltage magnitude of the first electrical signal. The magnitude of the optical power is related to the frequency difference between the reference optical signal and the first optical signal, and the frequency difference between the reference optical signal and the first optical signal can be obtained by the magnitude of the optical power. In some applications, the first electrical signal will be converted from a voltage signal to a current signal. At this time, the frequency difference between the reference optical signal and the first optical signal can also be obtained according to the current magnitude of the first electrical signal.

[0012] In some examples, the optical signal transceiver device also includes a detection circuit. The detection circuit is coupled to the receiver. Wherein: the detection circuit is used to: when the receiver receives the first optical signal, output a second indication signal to the control circuit. The second indication signal is used to instruct the control circuit to detect the frequency difference between the reference optical signal and the first optical signal. In an embodiment of the present application, when the receiver receives the first optical signal, it is necessary to generate a first control signal to adjust the frequency of the reference optical signal. Therefore, when the receiver does not receive the first optical signal, in order to avoid the problem of power consumption waste caused by the control circuit still detecting the frequency difference between the reference optical signal and the first optical signal, the detection circuit can be used to check whether the receiver is receiving the first optical signal. When the receiver starts to receive the first optical signal, the detection circuit can output a second indication signal to the control circuit. After the control circuit receives the second indication signal, the control circuit starts to detect the frequency difference between the reference optical signal and the first optical signal. The embodiment of the present application can reduce the power consumption of the device.

[0013] In a possible implementation, the control circuit may determine the frequency difference between the reference optical signal and the first optical signal based on the optical signal:

[0014] In some examples, a first input terminal of the control circuit is coupled to an output terminal of the reference light source, and a second input terminal of the control circuit is coupled to an input terminal of the receiver. The control circuit is specifically used to: output a first control signal to the reference light source according to a frequency difference between the reference light signal and the first light signal. In an embodiment of the present application, the frequency difference between the reference light signal and the first light signal can be directly detected by frequency difference detection on the reference light signal and the first light signal, thereby obtaining the frequency difference between the reference light signal and the first light signal. And according to the frequency difference between the reference light signal and the first light signal, a first control signal is generated.

[0015] In a possible implementation, the first control signal is specifically used to: adjust the frequency of the reference optical signal with the first frequency difference as the adjustment amplitude. The first frequency difference is half of the frequency difference between the first optical signal and the second optical signal before adjustment. In the embodiment of the present application, each optical signal transceiver device adjusts the frequency of the reference optical signal with the first frequency difference as the adjustment amplitude when adjusting the reference optical signal. Because the first frequency difference is half of the frequency difference between the first optical signal and the second optical signal before adjustment. Because the second optical signal sent by the local optical signal transceiver device is the first optical signal received by the remote optical signal transceiver device, the first optical signal received by the local optical signal transceiver device is the second optical signal sent by the remote optical signal transceiver device. Therefore, when any two optical signal transceivers perform coherent optical communication as the local optical signal transceiver device and the remote optical signal transceiver device, the local optical signal transceiver device and the remote optical signal transceiver device both adjust half of the frequency difference, so that the two optical signal transceivers can be combined to fully compensate for the frequency difference between the first optical signal and the second optical signal. In this embodiment of the present application, there is no need to adaptively adjust the reference optical signal adjustment amplitude of a certain optical signal transceiver device. Any two optical signal transceiver devices can be directly used as a local optical signal transceiver device and a remote optical signal transceiver device. This implementation increases the application adaptability of the optical signal transceiver device.

[0016] In a second aspect, an embodiment of the present application provides a control method, which is based on an optical signal transceiver device. The optical signal transceiver device includes a transmitter, a receiver and a reference light source. The control method includes: the reference light source outputs a reference light signal. The receiver receives a first light signal and beats the first light signal according to the reference light signal. The transmitter modulates the reference light signal to obtain a second light signal and transmits the second light signal. A first control signal is obtained based on the frequency difference between the reference light signal and the first light signal. The first control signal is used to adjust the frequency of the reference light signal to control the frequency difference between the first light signal and the second light signal to be less than a first threshold.

[0017] In a possible implementation manner, the frequency difference between the reference optical signal and the first optical signal may be determined according to the electrical signal:

[0018] In some examples, the step of beating the first optical signal according to the reference optical signal includes: beating the first optical signal according to the reference optical signal to obtain a first electrical signal. The first electrical signal is used to indicate a frequency difference between the reference optical signal and the first optical signal. The step of outputting the first control signal to the reference light source includes: outputting the first control signal to the reference light source according to the first electrical signal.

[0019] In some examples, outputting the first control signal to the reference light source according to the first electrical signal includes: obtaining a first indication signal according to the first electrical signal. The first indication signal is used to indicate a current frequency difference between the first light signal and the second light signal. Outputting the first control signal to the reference light source according to the first indication signal.

[0020] In some examples, at least one of the multiple parameters of the first electrical signal is used to indicate a frequency difference between a reference optical signal and the first optical signal; the multiple parameters of the first electrical signal include: a phase of the first electrical signal, a current magnitude of the first electrical signal, and a voltage magnitude of the first electrical signal.

[0021] In some examples, the control method further includes: when the receiver receives the first optical signal, generating a second indication signal. The second indication signal is used to indicate the frequency difference between the detection reference optical signal and the first optical signal.

[0022] In a possible implementation manner, the frequency difference between the reference optical signal and the first optical signal may be determined according to the optical signal:

[0023] In some examples, the outputting the first control signal to the reference light source includes: obtaining a frequency difference between the reference light signal and the first light signal based on the reference light signal and the first light signal; and outputting the first control signal to the reference light source based on the frequency difference between the reference light signal and the first light signal.

[0024] In a possible implementation, the first control signal is specifically used to: adjust the frequency of the reference optical signal with a first frequency difference as an adjustment amplitude, so as to control the frequency difference between the reference optical signal and the first optical signal to be less than a first threshold; the first frequency difference is half of the frequency difference between the first optical signal and the second optical signal before adjustment.

[0025] In a third aspect, an embodiment of the present application further provides an optical communication system, the optical communication system comprising a plurality of optical signal transceiver devices as described in the first aspect above. The plurality of optical signal transceiver devices are connected via optical fibers.

[0026] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, the computer-readable storage medium comprising instructions. When the instructions are executed on a processor, the processor executes the control method described in the second aspect.

[0027] Regarding the technical principles and beneficial effects of the second, third and fourth aspects, please refer to the relevant description of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of an optical communication system provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of another optical communication system provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a first optical signal transceiver provided in an embodiment of the present application Figure 1 ;

[0031] Figure 4 A schematic diagram of the structure of another first optical signal transceiver provided in an embodiment of the present application Figure 2 ;

[0032] Figure 5 A schematic diagram of the structure of another first optical signal transceiver provided in an embodiment of the present application Figure 3 ;

[0033] Figure 6 A schematic diagram of the structure of a second optical signal transceiver provided in an embodiment of the present application Figure 1 ;

[0034] Figure 7 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 2 ;

[0035] Figure 8 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 3 ;

[0036] Fig. 9 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 4 ;

[0037] Fig.10 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 5 ;

[0038] Fig.11 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 6 ;

[0039] Fig.12 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 7 ;

[0040] Fig.13 A schematic diagram of the structure of another second optical signal transceiver provided in an embodiment of the present application Figure 8 ;

[0041] Fig.14 A schematic diagram of a control method provided in an embodiment of the present application Figure 1 ;

[0042] Fig.15 Another control method provided in the present invention is shown in FIG. Figure 2 ;

[0043] Fig.16 A flow chart of another control method provided in the embodiment of the present application Figure 3 ;

[0044] Fig.17 A schematic diagram of a working process of a second optical signal transceiver device provided in an embodiment of the present application;

[0045] Fig.18 A flow chart of another control method provided in the embodiment of the present application Figure 4 . DETAILED DESCRIPTION

[0046] It should be noted that the terms "first", "second", etc. involved in the embodiments of the present application are only used to distinguish features of the same type and cannot be understood as indicating relative importance, quantity, order, etc.

[0047] The terms "exemplary" or "for example" and the like in the embodiments of the present application are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the related concepts in a specific way.

[0048] The terms "coupling" and "connection" involved in the embodiments of the present application should be understood in a broad sense. For example, they may refer to a direct physical connection, or an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors, waveguides, electrodes, couplers, optical fibers or other devices.

[0049] First, some basic concepts involved in this application are explained:

[0050] Beat frequency (BF) means: if the vibration frequencies (or simply called frequencies) of two signals doing simple harmonic oscillation (SHO) are close, and the difference between their frequencies is much smaller than their respective frequencies, then a beat frequency will appear in time after the signals are superimposed. Take two signals doing simple harmonic oscillation as an example, the two signals are x1(t) = cos(t) and x2(t) = sin(1.2t). After adding them together, it can be found that the vibration of the synthesized signal is not a simple harmonic oscillation. At this time, the vibration frequency of the synthesized signal is close to the vibration frequency of x1(t) and the vibration frequency of x2(t), but the amplitude of the synthesized signal changes with another larger period. When synthesizing two signals doing simple harmonic oscillation with a small frequency difference, the amplitude of the synthesized signal changes slowly and periodically, which is called a beat. The frequency of this beat is called the beat frequency. In coherent optical communication, a photodetector (PD) can be used for beat frequency. The principle is: after the photodetector receives two optical signals of different frequencies, it will mix them and convert them into electrical signals. The frequencies of the two optical signals of different frequencies received by the photodetector are f1 and f2 respectively. When the photodetector performs mixing, a mixed electrical signal with a frequency of f1+f2 and a mixed electrical signal with a frequency of f1-f2 will be obtained. Since the frequencies of f1 and f2 are generally large, and the bandwidth of the photodetector is less than the sum of f1+f2, the photodetector at this time is equivalent to a low-pass filter, which will filter out the signal with a frequency of f1+f2, leaving only the signal with a frequency of f1-f2, and the electrical signal with a frequency of f1-f2 can be used as the signal obtained by the beat frequency.

[0051] The embodiment of the present application provides an optical communication system. The optical communication system includes multiple optical signal transceiver devices. The multiple optical signal transceiver devices are connected to each other through optical fibers. Figure 1 As shown, the multiple optical signal transceiver devices include a local optical signal transceiver device 1000 and a remote optical signal transceiver device 2000. The local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 implement coherent optical transmission through optical fibers.

[0052] like Figure 2 As shown, the local optical signal transceiver device 1000 includes a receiver 100 and a transmitter 200. The receiver 100 is used to receive a first optical signal and perform beat frequency modulation on the first optical signal according to a local oscillator optical signal. The transmitter 200 is used to coherently modulate the carrier optical signal to obtain a second optical signal and transmit the second optical signal.

[0053] In some possible implementations, Figure 2In the illustrated architecture, the local optical signal transceiver device 1000 may be a first optical signal transceiver device, and two light sources are provided in a single first optical signal transceiver device to provide a local oscillator optical signal and a carrier optical signal respectively. Figure 3 As shown, the first optical signal transceiver device 1000A includes a receiver 100, a transmitter 200, a local oscillator light source 300 and a carrier light source 400. The local oscillator light source 300 is used to provide a local oscillator light signal to the receiver 100. The carrier light source 400 is used to provide a carrier light signal to the transmitter 200. In the embodiment of the present application, in order to ensure the transmission performance and transmission reliability of coherent optical communication, it is necessary to perform frequency calibration on the optical signal.

[0054] In some examples, such as Figure 3 In the embodiment shown, the frequency alignment can be performed on the first optical signal received by the receiver 100 of the first optical signal transceiver device 1000A. Figure 4 As shown, the first optical signal transceiver 1000A also includes a first frequency adjustment circuit 500A. The first input end of the first frequency adjustment circuit 500A is coupled to the input end of the receiver 100, the second input end of the first frequency adjustment circuit 500A is coupled to the output end of the local oscillator light source 300, and the output end of the first frequency adjustment circuit 500A is coupled to the controlled end of the local oscillator light source 300. The first frequency adjustment circuit 500A is used to: adjust the frequency of the local oscillator light signal according to the first optical signal and the local oscillator light signal, so as to adjust the frequency difference between the first optical signal and the local oscillator light signal. For example, Figure 4 As shown, the first frequency adjustment circuit 500A includes a first frequency detection circuit 510A and a first controller 520A. The first frequency detection circuit 510A inputs a first optical signal and a local oscillator optical signal, and obtains a first frequency electrical signal according to the first optical signal and the local oscillator optical signal. The first controller 520A obtains the frequency difference between the first optical signal and the local oscillator optical signal according to the first frequency electrical signal, and adjusts the frequency of the local oscillator optical signal to adjust the frequency difference between the first optical signal and the local oscillator optical signal. Through the embodiment of the present application, it is possible to align the frequency deviation between the first optical signal and the local oscillator optical signal received by the receiver 100, so as to improve the processing performance and processing reliability of the receiver 100 for the received first optical signal. However, as Figure 4 The illustrated embodiment can only achieve the alignment of the laser frequency deviation on the receiving side, but cannot align the laser frequency deviation on the transmitting side.

[0055] In some examples, such as Figure 3 In the embodiment shown, the frequency alignment can be performed on the second optical signal transmitted by the transmitter 200 of the first optical signal transceiver device 1000A. Figure 5As shown, the first optical signal transceiver 1000A also includes a second frequency adjustment circuit 500B. The input end of the second frequency adjustment circuit 500B is coupled to the output end of the transmitter 200, and the output end of the second frequency adjustment circuit 500B is coupled to the controlled end of the carrier light source 400. The second frequency adjustment circuit 500B is used to: adjust the frequency of the carrier light signal according to the second light signal, so as to adjust the frequency of the second light signal to the target frequency. For example, Figure 5 As shown, the second frequency adjustment circuit 500B may include a splitter 510B, a delayer 520B, a mixer 530B, a first photodetector 540B, a second photodetector 550B and a second controller 560B. The splitter 510B inputs a second optical signal and outputs two second optical signals. One of the second optical signals is directly output to the mixer 530B, and the other second optical signal is output to the delayer 520B. The delayer 520B performs a 90° phase shift on the input second optical signal, and then outputs the second optical signal after the phase shift delay to the mixer 530B. The mixer 530B performs mixing and combining on the two input second optical signals, and outputs the first mixed optical signal after mixing and combining to the first photodetector 540B and the second photodetector 550B respectively, and the first photodetector 540B and the second photodetector 550B respectively perform photoelectric conversion on the input first mixed optical signal to obtain an electrical signal. The second controller 560B calculates the output phase difference according to the electrical signal output by the first photodetector 540B and the electrical signal output by the second photodetector 550B, and adjusts the frequency of the carrier optical signal according to the output phase difference to adjust the frequency of the second optical signal to the target frequency.

[0056] In such Figure 3 , Figure 4 and Figure 5 In the embodiment shown, dual light sources are used to realize coherent optical communication. During the coherent optical communication, the frequency deviation of the optical signal can be aligned to improve the communication performance and reliability of the related optical communication. However, the device cost of the dual light source is relatively high, and Figure 4 and Figure 5 None of the embodiments of the present invention can achieve bilateral frequency offset alignment on the receiving side and the transmitting side.

[0057] In some possible implementations, Figure 2 In the illustrated architecture, the local optical signal transceiver device 1000 may be a second optical signal transceiver device, in which a single light source is provided to provide a local oscillator optical signal and a carrier optical signal respectively. Figure 6As shown, the second optical signal transceiver device 1000B includes a receiver 100, a transmitter 200 and a reference light source 600. The reference light source 600 is used to output a reference optical signal, provide the reference optical signal as a local oscillator optical signal to the receiver 100, and provide the reference optical signal as a carrier optical signal to the transmitter 200. In an embodiment of the present application, the reference optical signal is an optical signal that does not carry data information. The receiver 100 is used to receive a first optical signal, and beat the first optical signal according to the reference optical signal. The transmitter 200 is used to coherently modulate the reference optical signal to obtain a second optical signal, and transmit the second optical signal. In an embodiment of the present application, in order to ensure the transmission performance and transmission reliability of coherent optical communication, it is necessary to perform frequency calibration on the optical signal. However, in Figure 6 In the structure shown, the reference light signal output by the reference light source 600 is not only used as a local oscillator light signal provided by the receiving side, but also as a carrier light signal by the transmitting side. Figure 4 and Figure 5 The frequency offset alignment method used in the structure shown in the embodiment is not applicable to Figure 6 In the structure shown in the embodiment.

[0058] For the sake of Figure 6 The single light source structure shown is used for frequency offset alignment. In some possible implementations, Figure 6As shown, the second optical signal transceiver device 1000B includes a control circuit CC. The output end of the control circuit CC is coupled to the controlled end of the reference light source 600. Among them, the control circuit CC is used to output a first control signal to the reference light source 600 according to the frequency difference between the reference light signal and the first light signal; the first control signal is used to: adjust the frequency of the reference light signal to control the frequency difference between the first light signal and the second light signal to be less than a first threshold. The first threshold is a parameter value set according to an actual application scenario. When the frequency difference between the first light signal and the second light signal is less than the first threshold, the frequency deviation does not affect the normal operation of the second optical signal transceiver device 1000B. In an embodiment of the present application, the reference light signal is coherently modulated as a carrier light signal to obtain a second light signal, and the frequency of the second light signal is consistent with the frequency of the reference light signal. Therefore, in actual applications, the frequency difference between the reference light signal and the first light signal is the frequency difference between the second light signal and the first light signal. The first control signal can be generated according to the frequency difference between the reference light signal and the first light signal. A first control signal is output to the reference light source 600, and the frequency difference of the reference light signal is adjusted by the first control signal, so as to adjust the frequency difference between the first light signal and the second light signal. By controlling the frequency difference between the first light signal and the second light signal to be less than the first threshold, the frequency difference between the first light signal and the second light signal remains relatively stable. The first light signal is an optical signal transmitted by the remote optical signal transceiver device 2000 to the second optical signal transceiver device 1000B at the local end. The second light signal is an optical signal transmitted by the second optical signal transceiver device 1000B at the local end to the remote optical signal transceiver device 2000. Therefore, by adjusting the frequency of the reference light signal, the frequency offset alignment of the receiving side and the transmitting side can be achieved, and the bidirectional alignment of the local end and the remote end can also be achieved.

[0059] In some possible implementations, such as Figure 6 In the second optical signal transceiver 1000B shown in FIG. 1 , the control circuit CC can determine the frequency difference between the reference optical signal and the first optical signal through an electrical signal. For example, the frequency difference between the reference optical signal and the first optical signal can be obtained through the first electrical signal output by the receiver 100. Figure 7 As shown, the input end of the control circuit CC is coupled to the output end of the receiver 100. The receiver 100 is specifically used to: beat the first optical signal according to the reference optical signal to obtain a first electrical signal. The control circuit CC is specifically used to: output a first control signal to the reference light source 600 according to the first electrical signal. The first electrical signal is used to indicate the frequency difference between the reference optical signal and the first optical signal.

[0060] For example, Figure 8As shown, the receiver 100 includes a coupler 110 and a photoelectric detection circuit 120. The coupler 110 is used to input a first optical signal and a reference optical signal, and mix and combine the first optical signal and the reference optical signal to obtain a second mixed optical signal. The photoelectric detection circuit 120 performs a beat frequency on the second mixed optical signal to obtain a first electrical signal. For example, Figure 8 As shown, the receiver 100 may further include an amplifier 130. The output end of the photodetection circuit 120 is coupled to the amplifier 130. The amplifier 130 amplifies the first electrical signal and then outputs the amplified signal. In some examples, the amplifier 130 may be a trans-impedance amplifier (TLA).

[0061] At least one parameter of the multiple parameters of the first electrical signal is used to indicate the frequency difference between the reference optical signal and the first optical signal. In some examples, the phase change of the first electrical signal can indicate the frequency difference between the reference optical signal and the first optical signal. At this time, the coupler 110 outputs two second mixed optical signals with a phase difference of 90°. The photoelectric detection circuit 120 includes two photodetectors (photo detectors, PD), and the two second mixed optical signals are beat by the two photodetectors to obtain two first electrical signals. The control circuit CC can perform data processing on the two first electrical signals, analyze and obtain the phase change of the two first electrical signals, thereby obtaining the frequency difference between the reference optical signal and the first optical signal. In some examples, the optical power of the second mixed optical signal can be obtained according to the first electrical signal. The frequency difference between the reference optical signal and the first optical signal can be calculated according to the magnitude of the optical power. Exemplarily, a photoelectric detector is used to perform photoelectric conversion on the input optical signal to obtain an electrical signal, and the voltage magnitude of the electrical signal is related to the optical power of the optical signal. At this time, the voltage magnitude of the first electrical signal can indicate the magnitude of the related optical power. In some examples, the first electrical signal may be converted from a voltage signal to a current signal. In this case, the current magnitude of the first electrical signal may indicate the magnitude of the related optical power, and the frequency difference between the reference optical signal and the first optical signal may be obtained through the magnitude of the optical power.

[0062] For example, Fig. 9As shown, the second optical signal transceiver device 1000B also includes a data processor 700, a digital-to-analog converter 800 and an analog-to-digital converter 900. The receiving end of the data processor 700 is coupled to the output end of the receiver 100 through the analog-to-digital converter 900. The output end of the data processor 700 is coupled to the first input end of the transmitter 200 through the digital-to-analog converter 800. The second input end of the transmitter 200 is coupled to the output end of the reference light source 600. Among them, the data processor 700 is used to output a transmitted digital signal, and the transmitted digital signal carries the transmitted data information. The digital-to-analog converter 800 is used to perform digital-to-analog conversion on the transmitted digital signal to obtain a second electrical signal. The second electrical signal is an analog signal. The transmitter 200 coherently modulates the carrier optical signal through the second electrical signal to obtain a second optical signal. When the first optical signal is a service optical signal, the first electrical signal output by the receiver 100 carries the received data information. The analog-to-digital converter 900 is used to perform analog-to-digital conversion on the first electrical signal to obtain a received data signal, and the received data signal carries the received data signal. The data processor 700 parses the received data signal to obtain the received data information. The second optical signal transceiver device 1000B outputs a transmit data signal or inputs a receive data signal through the data processor 700 to perform optical communication with the remote optical signal transceiver device 2000.

[0063] In some examples, the data processor 700 may be a digital signal processing (DSP).

[0064] In some possible implementations, the control circuit CC may be an additional device.

[0065] In some possible implementations, the control circuit CC may be based on existing components in the optical signal transceiver device.

[0066] For example, the control circuit CC may be as follows: Fig. 9 The data processor 700 is shown. In the embodiment of the present application, by modifying the existing data processor 700 in the optical signal transceiver device at the software level, the data processor 700 can generate a first control signal according to the input first electrical signal to adjust the frequency difference between the first optical signal and the second optical signal.

[0067] For example, Fig.10As shown, the control circuit CC may include a data processor 700 and a controller C1. The data processor 700 is used to: output a first indication signal to the controller C1 according to the first electrical signal. The first indication signal is used to indicate the frequency difference between the first optical signal and the second optical signal. The controller C1 is used to: output a first control signal to the reference light source 600 according to the first indication signal. In an embodiment of the present application, the data processor 700 may generate a first indication signal according to the first electrical signal. The first electrical signal is used to indicate the frequency difference between the reference optical signal and the first optical signal. Because the frequencies of the reference optical signal and the second optical signal are consistent. Therefore, the data processor 700 may generate a first indication signal according to the first electrical signal. The frequency difference between the first optical signal and the second optical signal is indicated to the controller C1 through the first indication signal. The controller C1 generates a first control signal according to the first indication signal. The frequency of the reference optical signal is adjusted through the first control signal to adjust the frequency difference between the first optical signal and the second optical signal. In some examples, the controller C1 may be a control device additionally provided in a conventional optical signal transceiver. In some examples, the controller C1 may be a control device already existing in a conventional optical signal transceiver. For example, as Figure 4 The first controller 520A in the first optical signal transceiver device 1000A shown in FIG. Figure 5 The second controller 560B in the first optical signal transceiver device 1000A is shown.

[0068] For example, Fig.11 As shown, the control circuit CC may be a controller C1, and the controller C1 obtains a first control signal according to the electrical signal, and adjusts the frequency of the reference optical signal according to the first control signal.

[0069] In some examples, in actual product layout, the controller C1 can be integrated in the transmitter 200; the controller C1 can also be integrated in the receiver 100; the controller C1 can also be integrated with the data processor 700; the controller C1 can also be a discrete device and set on the same or different circuit board as the receiver 100, the transmitter 200 and the data processor 700.

[0070] In some possible implementations, such as Fig.12 As shown, the second optical signal transceiver device 1000B further includes a detection circuit DC. The detection circuit DC is coupled to the receiver 100. Wherein: the detection circuit DC is used to: when the receiver 100 receives the first optical signal, output a second indication signal to the control circuit CC. The second indication signal is used to instruct the control circuit CC to detect the frequency difference between the reference optical signal and the first optical signal. In the embodiment of the present application based on Figure 7 , Figure 8 , Fig. 9 and Fig.10In the embodiment described in the claims, the control circuit CC generates a first control signal based on an electrical signal. When the receiver 100 does not receive the first optical signal, there is no need to generate a first control signal to adjust the frequency difference between the first optical signal and the second optical signal. Therefore, the detection circuit DC can be used to detect whether the receiver 100 receives the first optical signal. When the receiver 100 receives the first optical signal, the detection circuit DC outputs a second indication signal, and the second indication signal is used to indicate that the control circuit CC starts detecting the frequency difference between the reference optical signal and the first optical signal, and generates a first control signal based on the frequency difference between the reference optical signal and the first optical signal. The power consumption caused by the control circuit CC can be reduced through the embodiments of the present application.

[0071] In some examples, the detection circuit DC is also used to: when the receiver 100 stops receiving the first optical signal, output a third indication signal to the control circuit CC. The third indication signal is used to instruct the control circuit CC to stop detecting the frequency difference between the first optical signal and the second optical signal. In an embodiment of the present application, when the receiver 100 stops receiving the first optical signal, there is no need for the control circuit CC to continue to output the first control signal. At this time, the detection circuit DC detects that the receiver 100 stops receiving the first optical signal and outputs the third indication signal to the control circuit CC. After inputting the third indication signal, the control circuit CC stops detecting the frequency difference between the first optical signal and the second optical signal. The power consumption caused by the control circuit CC can be reduced through the embodiment of the present application.

[0072] Exemplarily, the detection circuit DC can detect the change of the optical signal or the change of the electrical signal on the transmission path of the receiver 100 to determine whether the receiver 100 is receiving the first optical signal or not. For example, the detection end of the detection circuit DC can be coupled to Figure 8 The output end of the photodetection circuit 120 or the output end of the amplifier 130 in the receiver 100 is used to detect the change of the electrical signal, thereby determining whether the receiver 100 is receiving the first optical signal or not.

[0073] In some possible implementations, such as Figure 6 In the second optical signal transceiver 1000B shown in FIG. 1 , the control circuit CC can determine the frequency difference between the reference optical signal and the first optical signal through the optical signal. For example, Fig.13As shown, a first input terminal of the control circuit CC is coupled to an output terminal of the reference light source 600. A second input terminal of the control circuit CC is coupled to an input terminal of the receiver 100. The control circuit CC is specifically configured to output a first control signal to the reference light source 600 according to the reference light signal and the first light signal. In the embodiment of the present application, the frequency difference between the reference light signal and the first light signal can be detected by the control circuit CC, and a first control signal can be generated according to the frequency difference between the reference light signal and the first light signal. The reference light signal can be adjusted by the first control signal to control the frequency difference between the first light signal and the second light signal to be less than a first threshold.

[0074] Exemplarily, the control circuit CC may be a third frequency adjustment circuit. The third frequency adjustment circuit includes a second frequency detection circuit and a third controller. The frequency difference between the reference optical signal and the first optical signal is detected by the second frequency detection circuit. Then, the first control signal is generated according to the frequency difference between the reference optical signal and the first optical signal by the third controller. In some examples, the third frequency adjustment circuit may be an additional device. In some examples, the third frequency adjustment circuit may use a device already existing in a conventional optical signal transceiver. For example, the third frequency adjustment circuit may use Figure 4 The first frequency adjustment circuit 500A in the application scenario of the dual light source shown in the figure. By modifying the first controller 520A of the first frequency adjustment circuit 500A at the software level, the function of the third frequency adjustment circuit mentioned above can be realized. For example, when the third frequency adjustment circuit adopts Figure 4 In the structure of the first frequency adjustment circuit 500A shown, the second frequency detection circuit may be a frequency detection circuit based on an etalon standard wavelength detector, or may be a frequency detection circuit based on an adjustable comb filter.

[0075] In some possible implementations, the remote optical signal transceiver 2000 may also be the structure shown in the second optical signal transceiver 1000B. For the technical principle and beneficial effects of the remote optical signal transceiver 2000 being the structure shown in the second optical signal transceiver 1000B, reference may be made to the above embodiments and will not be repeated here.

[0076] In such Figure 1 He Ru Figure 2 In the optical communication system shown in the figure, the local optical signal transceiver device 1000 and / or the remote optical signal transceiver device 2000 can be based on the above Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.12 The second optical signal transceiver device 1000B of the structure shown in the figure implements the following Fig.14The first control method shown includes steps S100A to S300A, and the first control method implements frequency offset alignment based on an electrical signal:

[0077] S100A, optical communication system starts working.

[0078] For example, Figure 6 As shown, when the optical communication system starts coherent optical communication, in the second optical signal transceiver device 1000B, the reference light source 600 outputs a reference optical signal. The receiver 100 receives the first optical signal, and beats the first optical signal according to the reference optical signal. The transmitter 200 modulates the reference optical signal to obtain a second optical signal, and transmits the second optical signal. In some examples, the first optical signal and / or the second optical signal is a business optical signal carrying data information, that is, a business optical signal exchanged between the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000. In some examples, the first optical signal and / or the second optical signal may be an optical signal that does not carry data information. In an embodiment of the present application, it is necessary to perform frequency offset alignment on the optical signal exchanged between the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 in the optical communication system. During the frequency offset alignment process, whether the first optical signal and the second optical signal carry data information has no effect on the frequency offset alignment. Therefore, the frequency offset alignment can be performed during the service interaction between the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000, or the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 can specifically exchange optical signals with a certain frequency offset period to assist in the frequency offset alignment.

[0079] For example, Fig. 9 As shown, when the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 are in the process of business interaction, the data processor 700 generates a transmission data signal, and the digital-to-analog converter 800 performs digital-to-analog conversion on the transmission data signal to obtain a second electrical signal. The transmitter 200 coherently modulates the reference optical signal through the second electrical signal carrying the transmission data information, obtains the second optical signal as the business optical signal, and transmits it. The receiver 100 beats the first optical signal as the business optical signal with the reference optical signal to obtain a first electrical signal carrying the received data information. The analog-to-digital converter 900 performs analog-to-digital conversion on the first electrical signal to obtain a received data signal, and the received data signal carries the received data signal. The data processor 700 parses the received data signal to obtain the received data information.

[0080] S200A: Acquire a frequency difference between a reference optical signal and a first optical signal.

[0081] In some possible implementations, the frequency difference between the reference optical signal and the first optical signal may be obtained based on the first electrical signal. Fig. 9 As shown, performing a beat frequency on the first optical signal according to the reference optical signal includes: performing a beat frequency on the first optical signal according to the reference optical signal to obtain a first electrical signal. The first electrical signal is used to indicate a frequency difference between the reference optical signal and the first optical signal.

[0082] Exemplarily, at least one parameter among multiple parameters of the first electrical signal can be used to indicate the frequency difference between the reference optical signal and the first optical signal, and the at least one parameter includes: the phase of the first electrical signal, the current magnitude of the first electrical signal, and the voltage magnitude of the first electrical signal.

[0083] In some examples, the frequency difference between the reference optical signal and the first optical signal can be determined based on the phase of the first electrical signal. Figure 8 In the structure shown, the coupler 110 outputs two second mixed optical signals with a phase difference of 90°. The photoelectric detection circuit 120 includes two photodetectors (PD), and the two photodetectors are used to beat the two second mixed optical signals to obtain two first electrical signals. The control circuit CC can perform data processing on the two first electrical signals, analyze and obtain the phase changes of the two first electrical signals, and thus obtain the frequency difference between the reference optical signal and the first optical signal.

[0084] In some examples, the frequency difference between the reference optical signal and the first optical signal can be determined based on the current magnitude of the first electrical signal or the voltage magnitude of the first electrical signal. For example, the optical power of the second mixed optical signal can be obtained based on the first electrical signal. The frequency difference between the reference optical signal and the first optical signal can be calculated based on the magnitude of the optical power. Figure 8 In the structure shown, the photodetector in the photodetection circuit 120 is used to perform photoelectric conversion on the input optical signal to obtain an electrical signal, and the voltage of the electrical signal is related to the optical power of the optical signal. At this time, the voltage of the first electrical signal can indicate the relevant optical power. In some examples, the voltage signal of the first electrical signal can be converted into a current signal, at which time the current of the first electrical signal can indicate the relevant optical power, and the frequency difference between the reference optical signal and the first optical signal is obtained by the optical power.

[0085] Exemplarily, when the frequency difference between the reference optical signal and the first optical signal is obtained by using an electrical signal, step S200 may further include the following steps: Fig.15 Sub-operations of steps S210A to S220A shown:

[0086] S210A, generate a second indication signal.

[0087] For example, Fig.12 As shown, when the receiver 100 receives the first optical signal, a second indication signal is generated by the detection circuit DC; the second indication signal is used to indicate the frequency difference between the second optical signal and the first optical signal.

[0088] S220A: Detect a frequency difference between the second optical signal and the first optical signal according to the second indication signal.

[0089] For example, Fig.12 As shown, after the control circuit CC inputs the second indication signal, the control circuit CC starts to detect the frequency difference between the reference optical signal and the first optical signal.

[0090] S300A. Control the frequency difference between the first optical signal and the second optical signal.

[0091] In the embodiment of the present application, a first control signal is obtained according to the frequency difference between the reference optical signal and the first optical signal. The first control signal is used to adjust the frequency of the reference optical signal to control the frequency difference between the first optical signal and the second optical signal to be less than a first threshold.

[0092] In some possible implementations, such as Figure 7 , Figure 8 and Fig. 9 As shown, the first control signal can be directly generated according to the first electrical signal.

[0093] In some possible implementations, step S300A may include the following: Fig.16 Sub-operations of steps S310A to S320A shown:

[0094] S310A. Obtain a first indication signal according to the first electrical signal.

[0095] For example, Fig.10 As shown, the data processor 700 outputs a first indication signal to the controller C1 according to the first electrical signal. The first indication signal is used to indicate the current frequency difference between the first optical signal and the second optical signal.

[0096] S320A: Output a first control signal to the reference light source 600 according to the first instruction signal.

[0097] For example, Fig.10 As shown, after receiving the first indication signal, the controller C1 can determine the frequency difference between the reference light signal and the first light signal, and then determine the frequency difference between the first light signal and the second light signal. At this time, the controller C1 can output a first control signal to the reference light source 600 according to the first indication signal to control the frequency difference between the first light signal and the second light signal to be less than a first threshold.

[0098] In some possible implementations, the first control signal may adjust the reference optical signal based on different adjustment amplitudes.

[0099] In some examples, one of the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 adjusts the reference optical signal. For example, if the local optical signal transceiver device 1000 is the structure shown in the second optical signal transceiver device 1000B, then when the control circuit CC in the local optical signal transceiver device 1000 can generate a first control signal, with the first frequency difference as the adjustment amplitude, adjust the frequency of the local reference optical signal to control the frequency difference between the reference optical signal and the first optical signal to be less than the first threshold. At this time, the first frequency difference can be equal to the frequency difference between the first optical signal and the second optical signal. Alternatively, the remote optical signal transceiver device 2000 is the structure shown in the second optical signal transceiver device 1000B, and a first control signal is generated in the remote optical signal transceiver device 2000, and the frequency of the remote reference optical signal is adjusted by the first control signal with the first frequency difference as the adjustment amplitude to control the frequency difference between the remote reference optical signal and the first optical signal received at the remote end to be less than the first threshold. In the embodiment of the present application, the second optical signal transmitted by the local end is the first optical signal received by the remote end, and the first optical signal received by the local end is the second optical signal transmitted by the remote end. Therefore, by setting in advance, it is agreed that the adjustment is performed by the local end or the remote end, so that the frequency offset alignment between the first optical signal and the second optical signal can be achieved.

[0100] In some examples, both the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 are structures shown in the second optical signal transceiver device 1000B, and both the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 need to generate a first control signal to adjust the frequency of the corresponding reference optical signal. Exemplarily, the local optical signal transceiver device 1000 can be adjusted based on the second frequency difference times the first coefficient, and the remote optical signal transceiver device 2000 can be adjusted based on the second frequency difference times the second coefficient. Among them, the first coefficient and the second coefficient are coefficient values ​​with opposite adjustment directions. And the sum of the first coefficient and the second coefficient is equal to 1. The second frequency difference is the frequency difference between the first optical signal and the second optical signal before adjustment. In an embodiment of the present application, the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 can jointly adjust their own reference optical signals so that the frequency difference between the first optical signal and the second optical signal is less than the first threshold. In the embodiment of the present application, theoretically, as long as the sum of the first coefficient and the second coefficient is equal to 1, the frequency difference adjustment amount can be equal to the second frequency difference, so that after adjusting the frequency of the reference optical signal, the frequency difference between the first optical signal and the second optical signal is less than the first threshold.

[0101] In some examples, the absolute value of the first coefficient and the second coefficient is equal to one-half. That is, the first control signal is specifically used to adjust the frequency of the reference optical signal with the first frequency difference as the adjustment amplitude, so as to control the frequency difference between the reference optical signal and the first optical signal to be less than the first threshold. And the first frequency difference is half of the frequency difference between the first optical signal and the second optical signal before adjustment. That is, the absolute value of the first frequency difference is equal to half of the absolute value of the second frequency difference. In an embodiment of the present application, when each second optical signal transceiver device 1000B uses half of the second frequency difference as the adjustment amplitude, there is no need to make additional settings for different second optical signal transceiver devices 1000B. Two second optical signal transceiver devices 1000B can be arbitrarily selected as the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 to realize coherent optical communication without having to adjust the frequency adjustment amplitude of the reference optical signal of the two second optical signal transceiver settings 1000B in advance.

[0102] In some possible implementations, for the second optical signal transceiver device 1000B that needs to adjust the frequency of the reference optical signal, it is necessary to determine the frequency adjustment direction of the reference optical signal. Exemplarily, the frequency difference between the reference optical signal and the first optical signal (or the frequency difference between the first optical signal and the second optical signal) calculated by each second optical signal transceiver device 1000B is directional, that is, how much greater the frequency value of the reference optical signal is than the first optical signal, or how much less the frequency value of the reference optical signal is than the first optical signal. Then the second optical signal transceiver device 1000B needs to adjust the reference optical signal in the opposite direction to the frequency difference between the reference optical signal and the first optical signal. For example, when the frequency value of the reference optical signal is greater than the frequency value of the first optical signal, the frequency of the reference optical signal is reduced. When the frequency value of the reference optical signal is less than the frequency value of the first optical signal, the frequency of the reference optical signal is increased.

[0103] For example, taking the case where the absolute value of the first coefficient and the second coefficient is equal to one half, the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 including the structure shown in the second optical signal transceiver device 1000B can perform the following steps: Fig.17The processing flow shown is as follows: First, the detection circuit DC detects whether the receiver 100 has a first optical signal input. When the receiver 100 receives the first optical signal, the control circuit CC starts to detect the frequency difference Det_f between the reference optical signal and the first optical signal. When the frequency difference Det_f between the reference optical signal and the first optical signal is less than the first threshold, the adjustment process ends. When the frequency difference Det_f between the reference optical signal and the first optical signal is greater than or equal to the first threshold, the frequency of the reference optical signal is adjusted with an adjustment amplitude of -Det_f / 2 according to the first control signal. After adjusting the frequency of the reference optical signal, if the frequency difference between the reference optical signal and the first optical signal is less than the first threshold, the adjustment process ends; if the frequency difference between the reference optical signal and the first optical signal is greater than or equal to the first threshold, readjustment is performed. Because the frequencies of the reference optical signal and the second optical signal are consistent, the frequency difference between the first optical signal and the second optical signal can be controlled to be less than the first threshold through the above process. It should be noted that the frequency adjustment directions between the local optical signal transceiver device 1000 and the remote optical signal transceiver device 2000 are opposite, that is, the first coefficient and the second coefficient are coefficient values ​​in opposite directions. Because the frequency of the reference optical signal at the local end is equal to the frequency of the first optical signal at the remote end, and the frequency of the first optical signal at the local end is equal to the frequency of the reference optical signal at the remote end. Therefore, when the frequency of the reference optical signal at the local end is greater than the frequency of the first optical signal at the local end, the frequency of the reference optical signal at the remote end is less than the frequency of the first optical signal at the remote end.

[0104] Exemplarily, for example, when the reference optical signals at both ends are randomly distributed within the range of (-a, +a) GHz that deviates from the ITU standard wavelength, a is 5 GHz. The frequency deviation at this end is -2 GHz, and the frequency deviation at the far end is +4 GHz. The frequency of the reference optical signal at this end is less than the frequency of the first optical signal at this end, that is, the frequency difference Det_f detected by this end is -6 GHz. The frequency of the reference optical signal at the far end is greater than the frequency of the first optical signal at the far end, that is, the frequency difference Det_f at the far end is +6 GHz. Then the local end can adjust the frequency of the reference optical signal at this end by +3 GHz through the first control signal, and the far end can adjust the frequency of the reference optical signal at the far end by -3 GHz through the first control signal, so that the adjusted wavelength is around +1 GHz of the standard wavelength. Because there is a precise error in the adjustment of the reference optical signal, the adjusted wavelength may slightly deviate from the standard wavelength +1 GHz range. However, as long as the error of the adjusted wavelength is within the first threshold range, it will suffice. Taking the first threshold of 100 MHz as an example, as long as the adjusted wavelength is within the standard wavelength +1 GHz ±1 MHz range, it will suffice.

[0105] In such Figure 1 He Ru Figure 2 In the optical communication system shown in the figure, the local optical signal transceiver device 1000 and / or the remote optical signal transceiver device 2000 can be based on the above Figure 6and Fig.13 The second optical signal transceiver device 1000B of the structure shown in the figure implements the following Fig.18 The second control method shown includes steps S100B to S200B, and the second control method implements frequency offset alignment based on an optical signal:

[0106] S100B, the optical communication system starts working.

[0107] Regarding the technical principle and technical effect of step S100B, reference may be made to the relevant operations of the above-mentioned step S100A, which will not be repeated here.

[0108] S200B. Control the frequency difference between the first optical signal and the second optical signal.

[0109] In some possible implementations, the frequency difference between the reference optical signal and the first optical signal is obtained by optical signal acquisition. For example, Fig.13 As shown, the control circuit CC inputs a reference optical signal and a first optical signal, and the frequency difference between the reference optical signal and the first optical signal can be determined according to the reference optical signal and the first optical signal. Because the frequencies of the reference optical signal and the second optical signal are consistent, the frequency difference between the first optical signal and the second optical signal can be determined according to the frequency difference between the reference optical signal and the first optical signal. According to the frequency difference between the first optical signal and the second optical signal, a first control signal is generated, and the frequency of the reference optical signal is adjusted by the first control signal to control the frequency difference between the reference optical signal and the first optical signal to be less than a first threshold.

[0110] Regarding the technical principle and technical effect of using the first control signal to adjust the reference optical signal in step S200B, reference may be made to the relevant description in the aforementioned step S300A, which will not be repeated here.

[0111] The embodiment of the present application provides an optical signal transceiver device, a control method and an optical communication system. The optical signal transceiver device includes a transmitter, a receiver, a reference light source and a control circuit. Among them, the reference light source outputs a reference light signal. The receiver receives a first light signal; and uses the reference light signal as a local oscillator light signal to beat the first light signal. The transmitter modulates the reference light signal as a carrier light signal to obtain a second light signal, and transmits the second light signal. In this process, the frequency difference between the reference light signal and the first light signal is determined by setting a control circuit, and according to the frequency difference between the reference light signal and the first light signal, a first control signal is output to the reference light source. The frequency of the reference light signal is adjusted by the first control signal. Because the frequencies of the reference light signal and the second light signal are consistent, the frequency difference between the first light signal and the second light signal can be controlled by the first control signal to be less than the first threshold. In the embodiment of the present application, by setting a single light source (i.e., a reference light source) to provide a local oscillator light signal and a carrier light signal, the cost of coherent optical communication can be reduced. At the same time, the frequency difference between the reference light signal and the first light signal is determined by the control circuit, and the frequency of the reference light signal is adjusted. Because the frequencies of the reference light signal and the second light signal are consistent. Therefore, the frequencies of the first optical signal and the second optical signal can be controlled by adjusting the reference optical signal. The above scheme can achieve frequency alignment of the transmitting side and the receiving side, and at the same time, the frequency alignment of the local end and the remote end can be achieved. In addition, the embodiment of the present application can be implemented using an existing device architecture, and can be updated at the software level in the deployed device, thereby greatly reducing the device cost.

[0112] The present application also provides a computer-readable storage medium, which includes instructions. When the instructions are executed on a processor, the processor executes the control method described in the above embodiment (for example, Fig.14 , Fig.15 , Fig.16 The control method shown, or Fig.18 control method shown).

[0113] The processor or controller involved in the embodiments of the present application may be a chip. For example, it may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0114] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0115] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0116] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0117] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0118] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one device or distributed on multiple devices. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0119] In addition, each functional module in each embodiment of the present application may be integrated into one device, or each module may exist physically separately, or two or more modules may be integrated into one device.

[0120] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing a computer program instruction on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may contain one or more servers, data centers and other data storage devices that can be integrated with a medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0121] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical signal transceiver device, characterized in that: It includes a transmitter, a receiver, a reference light source and a control circuit; wherein: The reference light source is used to: output a reference light signal; The receiver is used to: receive a first optical signal; and perform a beat frequency analysis on the first optical signal according to the reference optical signal; The transmitter is used to: modulate the reference optical signal to obtain a second optical signal, and transmit the second optical signal; The control circuit is used to: output a first control signal to the reference light source according to the frequency difference between the reference light signal and the first light signal; the first control signal is used to: adjust the frequency of the reference light signal to control the frequency difference between the first light signal and the second light signal to be less than a first threshold.

2. The optical signal transceiver device according to claim 1, characterized in that: An input terminal of the control circuit is coupled to an output terminal of the receiver; The receiver is specifically used to: beat the first optical signal according to the reference optical signal to obtain a first electrical signal; the first electrical signal is used to indicate the frequency difference between the reference optical signal and the first optical signal; The control circuit is specifically used for: The first control signal is output to the reference light source according to the first electrical signal.

3. The optical signal transceiver device according to claim 2, characterized in that: The control circuit includes a data processor and a controller; wherein: The data processor is used to: output a first indication signal to the controller according to the first electrical signal; the first indication signal is used to indicate the frequency difference between the first optical signal and the second optical signal; The controller is used to output the first control signal to the reference light source according to the first indication signal.

4. The optical signal transceiver device according to claim 2 or 3, characterized in that: At least one parameter among the plurality of parameters of the first electrical signal is used to indicate a frequency difference between the reference optical signal and the first optical signal; The multiple parameters of the first electrical signal include: a phase of the first electrical signal, a current magnitude of the first electrical signal, and a voltage magnitude of the first electrical signal.

5. The optical signal transceiver device according to any one of claims 2 to 4, characterized in that: The optical signal transceiver device further includes a detection circuit; the detection circuit is coupled to the receiver; wherein: The detection circuit is used to: when the receiver receives the first optical signal, output a second indication signal to the control circuit; the second indication signal is used to instruct the control circuit to detect the frequency difference between the reference optical signal and the first optical signal.

6. The optical signal transceiver device according to claim 1, characterized in that: A first input terminal of the control circuit is coupled to an output terminal of the reference light source, and a second input terminal of the control circuit is coupled to an input terminal of the receiver.

7. The optical signal transceiver device according to any one of claims 1 to 6, characterized in that: The first control signal is specifically used to adjust the frequency of the reference optical signal with a first frequency difference as an adjustment amplitude; the first frequency difference is half of the frequency difference between the first optical signal and the second optical signal before adjustment.

8. A control method, characterized in that: Based on optical signal transceiver equipment; The optical signal transceiver device includes a transmitter, a receiver and a reference light source; the control method includes: The reference light source outputs a reference light signal; The receiver receives a first optical signal, and performs a beat frequency on the first optical signal according to the reference optical signal; The transmitter modulates the reference optical signal to obtain a second optical signal, and transmits the second optical signal; A first control signal is obtained according to the frequency difference between the reference optical signal and the first optical signal; the first control signal is used to adjust the frequency of the reference optical signal to control the frequency difference between the first optical signal and the second optical signal to be less than a first threshold.

9. The control method according to claim 8, characterized in that: The beating the first optical signal according to the reference optical signal comprises: beating the first optical signal according to the reference optical signal to obtain a first electrical signal; the first electrical signal is used to indicate a frequency difference between the reference optical signal and the first optical signal; The outputting the first control signal to the reference light source includes: outputting the first control signal to the reference light source according to the first electrical signal.

10. The control method according to claim 9, characterized in that: The step of outputting the first control signal to the reference light source according to the first electrical signal comprises: Obtaining a first indication signal according to the first electrical signal; the first indication signal is used to indicate a current frequency difference between the first optical signal and the second optical signal; According to the first indication signal, the first control signal is output to the reference light source.

11. The control method according to claim 9 or 10, characterized in that: At least one parameter among the plurality of parameters of the first electrical signal is used to indicate a frequency difference between the reference optical signal and the first optical signal; The multiple parameters of the first electrical signal include: a phase of the first electrical signal, a current magnitude of the first electrical signal, and a voltage magnitude of the first electrical signal.

12. The control method according to any one of claims 9 to 11, characterized in that: The control method further comprises: When the receiver receives the first optical signal, a second indication signal is generated; the second indication signal is used to indicate the detection of a frequency difference between the reference optical signal and the first optical signal.

13. The control method according to any one of claims 8 to 12, characterized in that: The first control signal is specifically used to: adjust the frequency of the reference optical signal with a first frequency difference as an adjustment amplitude, so as to control the frequency difference between the reference optical signal and the first optical signal to be less than a first threshold; the first frequency difference is half of the frequency difference between the first optical signal and the second optical signal before adjustment.

14. An optical communication system, characterized in that: It comprises a plurality of optical signal transceiver devices as described in any one of claims 1 to 7; the plurality of optical signal transceiver devices are connected via optical fibers.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes instructions; when the instructions are executed on a processor, the processor is enabled to execute the control method according to any one of claims 8 to 13.

Images