CN111901044A - Single-beam coherent optical communication device - Google Patents

Single-beam coherent optical communication device Download PDF

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CN111901044A
CN111901044A CN202011012264.0A CN202011012264A CN111901044A CN 111901044 A CN111901044 A CN 111901044A CN 202011012264 A CN202011012264 A CN 202011012264A CN 111901044 A CN111901044 A CN 111901044A
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CN111901044B (en
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黄春晖
翟耀宗
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Yango University
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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
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • 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
    • H04B10/516—Details of coding or modulation
    • 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
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse modulation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/63—Homodyne, i.e. coherent receivers where the local oscillator is locked in frequency and phase to the carrier signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/70—Photonic quantum communication

Abstract

The invention relates to the technical field of coherent optical communication, in particular to a single-beam coherent optical communication device, which comprises an ARM-PC combined control module and a single-beam coherent communication system, wherein the ARM-PC combined control module consists of an ARM and a PC, and a control circuit consisting of the ARM and the PC is used for cooperatively controlling a light source module, an encoding module and a decoding module in the single-beam coherent optical communication system to realize single-beam coherent optical communication; the ARM-PC joint control module control logic comprises: an initialization mode for completing the adjustment and calibration of the system; the communication mode is used for controlling the optical information coding and decoding of the communication system and realizing single-beam coherent optical communication; the invention can enter the initialization mode to calibrate the system first when the system is powered on, in the communication mode, the invention not only controls the normal work of the light source module, the coding module and the decoding module, but also monitors the working point of the system, when the working point is detected to drift, the invention starts the correction control scheme to adjust and correct the working point, so as to lead the working point to return to the normal state.

Description

Single-beam coherent optical communication device
Technical Field
The invention relates to the technical field of coherent optical communication, in particular to a single-beam coherent optical communication device.
Background
In the field of quantum optical communication, quantum key distribution realized by continuous variable coherent optical communication is a safe and efficient key transmission mode. The technology can be butted with the existing optical communication technology, and has the advantages of low cost, high detection efficiency and the like compared with a discrete variable quantum key distribution technology. At present, a continuous variable coherent optical communication technology is to transmit signal light and local oscillator light separately according to a mach-zehnder interference principle, two beams of light are affected by different environments in a free space, and the two beams of light are difficult to be recoupled into one beam of light at a receiving end, so that the stability and reliability of an experiment are affected. The single-beam coherent optical communication mode based on Stokes parameters utilizes the polarization multiplexing principle to linearly polarize light
Figure BDA0002697887210000011
Decomposition into two orthogonal components
Figure BDA0002697887210000012
In which the small polarization component
Figure BDA0002697887210000013
Encoded as signal light, large component
Figure BDA0002697887210000014
As local oscillator light, the coherent light communication can be realized by using a single light beam, and the defects of the double-light beam coherent light communication are overcome. However, this single beam is coherentThe optical communication technology has a plurality of control logics and control objects of a communication system, and comprises a light source module, an encoding module, a decoding module, an ARM control panel, an acquisition card and hardware drivers corresponding to the modules, wherein each module has respective characteristics and functions. In order to realize the ordered work of single-beam coherent optical communication, it is essential to configure a set of circuit control modules to coordinate the ordered work of each part. On the basis of actually testing the performance of a single-beam coherent light system and optimizing various driving electrical indexes, the circuit control module is provided with the following basic functions: the ARM and the PC are combined to form a control circuit unit, and before the single-beam coherent optical communication system enters normal communication, the whole optical communication system can be calibrated to generate a collimated pulse laser beam; during normal communication, the encoder and the decoder can be controlled to work in a coordinated mode to complete encoding and decoding, meanwhile, the working state of the communication system is monitored, when the working point drifts due to fluctuation of the working environment and the external environment and the stability and the efficiency of the communication system are affected, the correction control scheme can be exercised, and the communication system is adjusted to be in a normal working state. On the basis of single-beam coherent optical communication, the method can be expanded to continuous variable coherent optical communication.
In summary, the present invention provides a single-beam coherent optical communication device, which comprises an ARM-PC control circuit module and a single-beam coherent communication system, wherein under the control of the control circuit module, the communication system enters a working state of a calibration initialization mode, then single-beam coherent optical communication is realized in a normal communication mode, and simultaneously the working state of the communication system is monitored, and when a working point of the communication system drifts, a correction control scheme can be implemented to adjust the communication system to a normal working state.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a single-beam coherent optical communication device.
In order to achieve the purpose, the invention adopts the following technical scheme:
a single-beam coherent optical communication device, as shown in FIG. 1, comprises an ARM-PC control circuit module, wherein the ARM-PC control circuit module is composed of an ARM and a PC, and is used for realizing cooperative control of a light source module, an encoding module and a decoding module in a single-beam coherent optical communication system and realizing single-beam coherent optical communication;
the ARM-PC joint control module control logic comprises:
the method comprises the following steps of (1) in an initialization mode, controlling a light source module of a single-beam coherent communication system to generate a collimated pulse laser beam, and completing adjustment and calibration of the system;
the communication mode is used for realizing information encoding and decoding of the polarized light;
meanwhile, a correction control scheme is arranged in the communication mode, and when the scheme detects that the working point of the communication system drifts, the working state of the communication system is automatically adjusted to be recovered to a normal working point.
Preferably, the light source module diagram in the single-beam coherent communication system is used for collimating and purifying continuous laser beams emitted by a semiconductor Laser (LD) and chopping and outputting collimated pulses through an acousto-optic modulator.
Preferably, the encoding module diagram changes the pulse light beam of the light source module into the polarization state S through the linear polarizerin＝[1 0 -1 0]TInputting light, receiving two control voltages Vx and Vz from the control circuit module by the coding driver, amplifying the two control voltages, and applying the amplified control voltages to the X-type electro-optical crystal and the Z-type electro-optical crystal of the coder respectively to realize S conversioninConversion into the desired polarization code Sout1＝[1 S1S2S3]T。。
Preferably, the decoding module diagram consists of a half-wave plate, a component selector and a homodyne detection circuit, wherein the component selector can obtain a control voltage V in the range of 0-120V from the control circuit modulecReceiving the carrier light Sin2＝[1S′1S′2S′3]TThen, as an input of the decoder, different measurement bases are selected by the component selector for decoding.
Note that S is due to atmospheric scattering effects and reception limitationsin2And Sout1There is a certain error between them, which needs to be solvedAnd is completed by data processing.
The invention has the beneficial effects that:
the invention can enter the initialization mode to calibrate the system first when the system is powered on, in the communication mode, the invention not only controls the normal work of the light source module, the coding module and the decoding module, but also monitors the working point of the system, when the working point is detected to drift, the invention starts the correction control scheme to correct and adjust the working point, so as to lead the working point to return to the normal state.
Drawings
Fig. 1 is a single beam coherent optical communication device of the invention.
Fig. 2 is a block diagram of a single beam coherent optical communication system.
Fig. 3 is a control timing diagram when the control module is in the communication mode.
FIG. 4 is a diagram of a corrective control model in communication mode.
Fig. 5 is a main part of a in fig. 1.
FIG. 6 is a circuit diagram of an acousto-optic modulator interface
Fig. 7 is a main part of b in fig. 1.
Fig. 8 is a package portion of fig. 7.
Fig. 9 is a main part of c in fig. 1.
Fig. 10 is a main part of d in fig. 1.
Fig. 11 and 12 show control logic for f and g in fig. 1.
Fig. 13 shows the test result of fig. 4, and it can be seen from the result that when the seventh data is detected, and the error is found to exceed the set threshold, the correction control scheme is started, and after a period of adjustment, the operating point returns to the normal state, and the system continues to communicate.
Fig. 14 is a measurement result of the whole communication device, and it can be seen from the figure that one is transmitted data and the other is correctly decoded data, and comparing the two results, it can be seen that the correctly decoded data is consistent with the transmitted data, which indicates that the control module of the present invention can be used as a control system of a single-beam coherent optical communication device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-14, a single beam coherent optical communication device includes: an ARM-PC combined control module, which is a control circuit module composed of an ARM and a PC and is used for controlling a light source module, an encoding module and a decoding module in a single-beam coherent optical communication system, wherein the core control logics mainly comprise two core control logics, one of the core control logics is an initialization mode and is used for adjusting and calibrating the communication system, the other core control logic is a communication mode, the control logic in normal operation is shown in figure 3, the main function of the control logic is to control the cooperative work between an encoder and a decoder to realize the encoding and decoding of the single-beam coherent optical communication, and a correction control scheme is embedded in the communication mode, as shown in figure 4, the scheme can automatically adjust the working state of the system when the system detects that the working point drifts, so that the working point returns to normal.
A light source module, as shown in fig. 5, the light emitted by the semiconductor laser is collimated and purified to obtain a collimated continuous laser beam; the control module provides a driver interface circuit for the acousto-optic modulator according to communication needs. Under the control of a control system IO1 signal, the acousto-optic modulator modulates the continuous laser beam into pulse light with the same frequency and duty ratio as the output of the IO1, and the pulse light is used for subsequent encoding and decoding operations.
An encoding module for receiving two control voltages Vx and Vz from the control device and applying the two control voltages to the X-type electro-optical crystal and the Z-type electro-optical crystal of the encoder respectively, wherein under the action of the two control voltages, the encoder converts the polarization state into Sin1＝[1 0 -1 0]TThe input light is modulated to have a polarization state Sout1＝[1 S1S2S3]TThen, the encoded S is transmittedout1The light beam is emitted into free space.
A decoding module consisting of a half-wave plate, a component selector driver and a homodyne detection circuit, wherein the componentThe selector can obtain 0-120V control voltage V from an IO4 port of a control systemcReceiving the carrier light Sin2＝[1 S′1S′2S′3]TThen, as the input of the decoder, the component selector selects different measurement bases for decoding, and the decoded signal light is Sout2(ii) a Then, under the control of the control module, the photodiode decodes the signal light Sout2And the signal is converted into an electric signal for detection of a homodyne circuit, so that decoding and detection are realized.
In the light source module, under the control of the control module, the acousto-optic modulator modulates the continuous laser beam into pulsed light. As shown in fig. 6, an interface circuit is added to the driver of the acousto-optic modulator, so that the frequency and duty ratio of the pulsed light can be adjusted to make the ultrasonic signal F and the IO1 signal N output by the control systemBThe relationship of (1) is:
Figure BDA0002697887210000051
wherein N isBThe binary output for the control system IO1 is converted to a decimal number.
In one embodiment of the invention, the encoding module, as shown in fig. 7, the driver of the encoder can obtain two encoding voltages Vx (as shown in fig. 8) and Vz from the control module and amplify the two encoding voltages, respectively, applied to the X-type and Z-type electro-optical crystals of the three-wafer encoder for the polarized light S passing through the encoderin1＝[1 0 -1 0]TModulation encoding is performed, the encoded light Sout1And the coding voltage relation is as follows:
Figure BDA0002697887210000061
wherein the content of the first and second substances,
Figure BDA0002697887210000062
no、nerespectively, the refractive index of ordinary light and the refractive index of extraordinary light, l is the light-passing length of the electro-optical crystal, d is the width of the electro-optical crystal, λ ═ 808nm is the wavelength of light, and γ is LiNbO3 electro-optical crystalThe volume coefficient.
The decoding module consists of a half-wave plate, a component selector and a homodyne detection circuit, wherein the component selector can obtain a control voltage V of 0-120V from an IO4 port of the control devicecDecoding the coded light by selecting different measurement bases, the decoded Sout2Output light and Sin2＝[1 S′1S′2S′3]TThe relationship between the input light is as follows:
Sout2＝S′2cos2+S′3sin2
wherein the content of the first and second substances,
Figure BDA0002697887210000063
can see when2When the value is 0, Sout2＝S′2When is coming into contact with2When the value is pi/2, Sout2＝S′3See fig. 9 and 10.
The ARM-PC combined control module is composed of an ARM and a PC and used for controlling the three parts, the number of core control logics of the ARM-PC combined control module is mainly two, one of the core control logics is an initialization mode and used for completing adjustment and calibration of a system, and a specific control flow is shown in figure 11. The second mode is a communication mode, which is used for controlling encoding and decoding of the communication system to realize single-beam coherent optical communication, and the control flow is shown in fig. 12. In which, a correction control scheme is embedded in the communication mode, and the scheme can automatically correct and adjust the working state of the system when the system detects that the working point drifts, so that the working point returns to normal, see fig. 13.
In this embodiment, the light source module a and the laser emitted by the semiconductor laser are collimated and purified to form a collimated continuous laser beam, and the collimated continuous laser beam is incident to the acousto-optic modulator, and under the control of the IO1 end of the control system, the continuous laser beam of the acousto-optic modulator is modulated into pulsed light, the duty ratio and the frequency of the pulsed light are controllable, and the prepared pulsed light is used for encoding by an encoder. Ultrasonic signal F and IO1 signal N output by control systemBThe relationship of (1) is:
Figure BDA0002697887210000071
the encoding module b is used for transforming the pulse beam into linearly polarized light S through a polarizer before the pulse beam enters the encoderin1＝[1 0-1 0]TThe encoder shown in FIG. 7 belongs to a three-chip polarization converter, and two control voltages Vx and Vz required by the encoder are provided by a control module, Vx and Vz are respectively applied to an X-type electro-optic crystal (shown in FIG. 8) and a Z-type electro-optic crystal of the encoder, and under the action of the two voltages, the encoder outputs Sin1Is converted into Sout1，Sout1And the coding voltage relation is as follows:
Figure BDA0002697887210000072
wherein the content of the first and second substances,
Figure BDA0002697887210000073
and the component selection module c consists of a half-wave plate, a component selector and a driving polarization beam splitter PBS thereof.
The front stage of the homodyne detection circuit d is provided with two photodiodes which are used for converting an optical signal into a current signal, converting the current signal into a voltage signal through an I-V conversion circuit, and performing operations such as acquisition and display through an acquisition card;
a decoding module e consisting of a component selection module c and a homodyne detection circuit d, wherein the component selector is able to derive a control voltage V from the control meanscAfter receiving the coded light, selecting different Stokes components to measure, wherein the received coded light signal is Sin2Of the decoded optical signal Sout2The relationship between them is as follows:
Sout2＝S′2cos2+S′3sin2
wherein the content of the first and second substances,
Figure BDA0002697887210000074
can see when2When the value is 0, Sout2＝S′2When is coming into contact with2When the value is pi/2, the crystal,Sout2＝S′3。
the ARM control circuit f has the functions of controlling the modules a and b, completing the generation of a light source and the modulation and coding of light, and simultaneously communicating with the module g; PC (equipped with acquisition card and LABVIEW) g, which controls the decoding of c and the acquisition of the signal generated by d, while keeping in communication with f; and the control system h consists of f and g, and comprises hardware parts of f and g, and a corresponding initialization mode communication mode and a correction control scheme.
The functional and logical relationships of the various units in the communication device are as follows:
the ARM-PC combined control module controls the optical communication system to carry out single-beam coherent optical communication in the light period, and is used for signal synchronization and compensation model updating in the light-free interval. The control device is mainly divided into an initialization mode and a communication mode, and the initialization mode is mainly used for adjusting the optical path so that the communication system can meet the communication requirement. The communication mode is used for the communication process. FIG. 2 illustrates the architecture of a single beam coherent optical communication device and its control pin definitions. In the period of initialization mode, a high level is output from a port PF1 of a control module to switch on a power module of an acousto-optic modulator (AOM), so that the drive of the AOM is powered on, a state of processing an emitted beam of an LD is entered, then a PF7 outputs a square wave signal, the AOM is entered into a working state, and the incident continuous laser beam is chopped into a pulse beam by using an acousto-optic effect. And simultaneously, entering calibration and linkage of a communication light path until the communication system meets the requirement of a communication mode, and starting entering a working state of the communication mode.
In a communication mode, the control module controls an encoder and a decoder of the communication system to work cooperatively, and single-beam coherent optical communication is realized. Meanwhile, in order to prevent the drift of the working point caused by external vibration, a correction control scheme is specially set, as shown in fig. 4, the correction control scheme is composed of a change-over switch, a compensation model, a trigger switch, a GRNN algorithm and the like, and the change-over switch is in a normally-closed state. Contact 1 is connected during normal communication. When the system detects that the error exceeds the threshold value, a correction control scheme is started, a trigger switch is started, a signal is output to a change-over switch, a normally closed contact 1 is transferred to a normally open contact 2, the signal enters GRNN, a new compensation model is trained again, when the pulse enters a period of no light gap, the newly calculated model is used for replacing the old compensation model, meanwhile, a reset signal is released to the trigger switch, and the change-over switch is controlled to be connected to the contact 1 again.
On the basis of the performance test of each module, the communication mode is started by combining the control logic of each module, and the upper electric control logic is shown in figure 3. The control scheme has the parallel working characteristic, not only can save the linkage time of the control module, but also can ensure that the voltage of the encoder is stabilized before the detection of the decoding module.
Working process of one communication cycle:
step 1: the PF1 port of the IO1 outputs a high level to turn on the power supply of the light source module AOM.
Step 2: PF7 of IO1 outputs high level digital signal to drive AOM and drive it to generate pulse laser, and outputs optical signal by 28 μ s. During this time the following steps are processed in turn.
And 3, step 3: the ADC module collects a voltage signal through a PA2 port to calculate a random number.
And 4, step 4: two independent DAC modules in the ARM output coding voltage to an encoder driver through two independent channels PA4 and PA5, and the coding voltage is used for modulating and coding signal light.
And 5, step 5: after the analog input port of the acquisition card AI1 detects the optical pulse signal, the port P01 is triggered to output a digital signal so as to control the component selector to select which component to measure.
And 6, step 6: the acquisition card stores the measured signals.
And 7, step 7: and if the error of the detected signal exceeds the threshold value in the communication process, starting a correction control scheme to retrain the compensation model, replacing and updating the old model, and otherwise, skipping the step.
And 8, step 8: after communication is finished, the sender and the receiver need to check the encoded and detected components through two signal lines of PA6-P00 and PA7-P02, keep consistent components and remove different components.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (4)

1. A single-beam coherent optical communication device comprises an ARM-PC combined control module, and is characterized in that the ARM-PC combined control module (figures 1f, g and h) is formed by an ARM and a PC to form a control circuit to cooperatively control a light source module a, a coding module b and a decoding module c in a single-beam coherent optical communication system, so that single-beam coherent optical communication is realized;
the ARM-PC joint control module control logic comprises:
the method comprises the following steps of (1) in an initialization mode, controlling a light source module of a single-beam coherent communication system to generate a collimated pulse laser beam, and completing adjustment and calibration of the communication system;
the communication mode is used for controlling the encoder b and the decoder c in the single-beam coherent communication system to work cooperatively so as to realize the encoding and decoding of information;
meanwhile, a correction control scheme is carried in the communication mode, the scheme can monitor the working point of the communication system, and when the working point of the communication system drifts, the correction scheme is automatically started to adjust the system to a normal working state.
2. The single-beam coherent optical communication device as claimed in claim 1, wherein the light source module a in the single-beam coherent communication system is configured to collimate and purify the continuous laser beam emitted from the semiconductor Laser (LD), and to output the collimated pulse laser beam by chopping with the acousto-optic modulator.
3. The apparatus as claimed in claim 1, wherein the encoding module converts the pulsed light from the light source module into S-polarized light by a linear polarizerin1＝[1 0 -1 0]TInputting light, receiving two control voltages Vx and Vz from the control module by the coding driver, amplifying the two control voltages and applying the amplified control voltages to the X-type electro-optical crystal and the Z-type electro-optical crystal of the coder respectively to realize S conversioninConversion into the desired polarization code Sout1＝[1 S1S2S3]T。
4. The apparatus as claimed in claim 1, wherein the decoding module of the single-beam coherent optical communication system comprises a half-wave plate, a component selector and a homodyne detection circuit, wherein the component selector is capable of obtaining a control voltage V ranging from 0V to 120V from the control apparatuscReceiving the carrier light Sin2＝[1 S′1S′2S′3]TThen, as an input of the decoder, different measurement bases are selected by the component selector for decoding.
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