CN114465664A - Optical delay line interferometer control method, system and computer - Google Patents

Optical delay line interferometer control method, system and computer Download PDF

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CN114465664A
CN114465664A CN202210095393.3A CN202210095393A CN114465664A CN 114465664 A CN114465664 A CN 114465664A CN 202210095393 A CN202210095393 A CN 202210095393A CN 114465664 A CN114465664 A CN 114465664A
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error rate
delay line
optical delay
line interferometer
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CN114465664B (en
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吕世猛
李赓
谢腾
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Beijing Aurora Xingtong Technology Co ltd
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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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07953—Monitoring or measuring OSNR, BER or Q
    • 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
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Abstract

The invention relates to a method, a system and a computer for controlling an optical delay line interferometer, wherein the method comprises the following steps: s1, initially, calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction method0(ii) a S2, setting the current bias voltage value of the optical delay line interferometer in the receiving end to V + delta V, and calculating the communication bit error rate BER after a preset time period T1(ii) a S3, calculating the BERiBER of communication error ratei‑1BER of communication bit error rate difference betweeni_i‑1(ii) a S4, according to the communication bit error rate difference BERi_i‑1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and the preset communication bit error rate delta BER; s5, calculating the communication bit error rate BER after a preset time period Ti+1(ii) a S6, making i equal to i +1 and circulatingS3-S5 are iteratively performed until the current bias voltage value stabilizes. The method can accurately calculate the error rate, dynamically and accurately adjust the bias voltage of the optical delay line interferometer based on the error rate, and dynamically keep the optical delay line interferometer in a demodulation state with low error rate continuously.

Description

Optical delay line interferometer control method, system and computer
Technical Field
The invention relates to the field of communication, in particular to a method, a system and a computer for controlling an optical delay line interferometer.
Background
In a space laser communication system using an optical differential phase shift keying technology or an optical differential quadrature phase shift keying technology system, a communication receiving end mainly depends on an optical delay line interferometer to demodulate an optical modulation signal, and applies bias voltage with a certain specific value to the optical delay line interferometer to enable an optical signal entering the optical delay line interferometer to generate a fixed phase difference, so that regular interference occurs at an output end of the optical delay line interferometer, the optical signal is correctly demodulated, and data recovery is completed through a receiving end data processing system. Among them, how to apply an appropriate bias to the optical delay line interferometer is the key to the demodulation of optical signals. The optical delay line interferometer is very sensitive to the received optical wavelength, and particularly for a long-distance space-ground laser communication application scene, when the receiving end and the receiving end move relatively, the optical wavelength received by the receiving end changes continuously, along with the change of the wavelength and the instability of the optical delay line interferometer, the proper bias voltage value required by optical signal demodulation changes continuously, and how to accurately control the bias voltage change so as to ensure that the optical delay line interferometer is in the optimal optical signal decoding state at any time is a more critical technical problem.
In the disclosure, only the operation state of the optical delay line interferometer can be monitored according to the error rate of the optical signal decoding, and the error rate is reduced by changing the bias voltage value, but a detailed and definite control method is not provided to solve the problem. In the actual data transmission process of laser communication, due to the unknown data, the source of the error rate is also evaluated according to the signal-to-noise ratio of the received optical signal, and certain uncertainty exists.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method, a system and a computer for controlling an optical delay line interferometer, which can accurately calculate the error rate, dynamically and accurately adjust the bias voltage of the optical delay line interferometer based on the error rate, and dynamically keep the optical delay line interferometer in a demodulation state with low error rate continuously.
The technical scheme for solving the technical problems is as follows: a control method of an optical delay line interferometer comprises the following steps,
s1, initially, in the process of receiving optical signals and decoding data at a receiving end, calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction method0；
S2, setting the current bias voltage value of the optical delay line interferometer in the receiving end to be V + delta V, and after the preset time period T, calculating the communication bit error rate BER of the receiving end in the preset time period T based on a forward error correction method1(ii) a Wherein, V is a preset initial bias value, and Δ V is a preset voltage adjustment amount;
s3, calculating the BERiBER of communication error ratei-1BER of communication bit error rate difference betweeni_i-1(ii) a Wherein BERi_i-1＝BERi-BERi-1，i＝1,2,3,...；
S4, according to the communication bit error rate difference BERi_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER;
s5, determining the BER according to the communication bit error rate differencei_i-1Under the condition that the current bias value of the optical delay line interferometer is adjusted through the relation between the communication error rate Delta BER and the preset communication error rate Delta BER, after the preset time period T, the communication error rate BER of the receiving end in the preset time period T is calculated based on a forward error correction methodi+1；
S6, i is made to be i +1, and the steps S3 to S5 are iteratively executed in a loop until the current bias voltage value of the optical delay line interferometer is stable.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, according to the communication bit error rate difference BERi_i-1The relation between the communication error rate delta BER and the preset communication error rate delta BER adjusts the current bias voltage value of the optical delay line interferometer, specifically,
if BERi_i-1If the current bias voltage value of the optical delay line interferometer is larger than delta BER, reducing the current bias voltage value of the optical delay line interferometer by a preset voltage adjustment quantity delta V;
if BERi_i-1< - Δ BER, the optical delay line is then connectedIncreasing a preset voltage adjustment quantity delta V for the current bias voltage value of the interferometer;
if-Delta BER is less than or equal to BERi_i-1And ≦ Δ BER, the current bias voltage value of the optical delay line interferometer is kept unchanged.
Further, calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction methodi-1The formula of (a) is as follows,
Figure BDA0003490828830000031
wherein, FEC _ Biti-1In the process of the i-1 iteration, after the receiving end receives the data frame, the bit number corrected by forward error correction in the decoding process is carried out through the forward error correction; m isi-1In the process of the i-1 iteration, the receiving end receives the damaged frame number which exceeds the forward error correction decoding capability after receiving the data frame; n isi-1In the process of the i-1 iteration, the number of the lost frames of the whole frame in the process of receiving data by the receiving end; dfb is the number of bits contained in each frame of data received by the receiving end; rb is the number of bits transmitted per second; and T is the preset time period.
Further, the optical delay line interferometer control method is applied to space laser communication of an optical differential phase shift keying system or an optical differential quadrature phase shift keying system.
Based on the control method of the optical delay line interferometer, the invention also provides a control system of the optical delay line interferometer.
An optical delay line interferometer control system includes the following modules,
communication bit error rate BER0A calculating module, configured to initially calculate, during a process of receiving an optical signal and performing data decoding at a receiving end, a communication bit error rate BER of the receiving end within a preset time period T based on a forward error correction method0；
Communication bit error rate BER1A calculation module for setting the current bias voltage value of the optical delay line interferometer in the receiving end to V + Δ V, andafter the preset time period T, calculating the communication bit error rate BER of the receiving end in the preset time period T based on a forward error correction method1(ii) a Wherein, V is a preset initial bias value, and DeltaV is a preset voltage adjustment quantity;
communication bit error rate difference BERi_i-1A calculation module for calculating a communication bit error rate BERiBER of communication error ratei-1BER of communication bit error rate difference betweeni_i-1(ii) a Wherein BERi_i-1＝BERi-BERi-1，i＝1,2,3,...；
A bias value adjusting module for adjusting BER according to communication bit error rate differencei_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER;
communication bit error rate BERi+1A calculation module for calculating the BER according to the communication bit error rate differencei_i-1Under the condition that the current bias value of the optical delay line interferometer is adjusted through the relation between the communication error rate Delta BER and the preset communication error rate Delta BER, after the preset time period T, the communication error rate BER of the receiving end in the preset time period T is calculated based on a forward error correction methodi+1；
A loop iteration module for making i ═ i +1 and performing loop iteration on the communication bit error rate difference BERi_i-1Calculating a BER from a module to the communication bit error ratei+1And calculating the module until the current bias voltage value of the optical delay line interferometer is stable.
Based on the control method of the optical delay line interferometer, the invention also provides a computer.
A computer, characterized by: comprising a processor, a memory and a computer program stored in the memory, which computer program, when executed by the processor, implements the optical delay line interferometer control method as described above.
The invention has the beneficial effects that: in the control method, the system and the computer of the optical delay line interferometer, the error rate of a receiving end can be directly and accurately calculated under the condition of transmitting unknown data based on forward error correction, and the decoding condition of the receiving end is accurately evaluated; and then, the bias voltage of the optical delay line interferometer can be dynamically and accurately controlled through the accurately calculated error rate, so that the time is kept in the optimal working state, the application effect of a control algorithm is greatly improved, and the method has great significance for improving the performance of space laser communication.
Drawings
FIG. 1 is a flow chart of a method for controlling an optical delay line interferometer according to the present invention;
FIG. 2 is a schematic diagram of bias adjustment in a method of controlling an optical delay line interferometer according to the present invention;
FIG. 3 is a block diagram of a control system of an optical delay line interferometer according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a method for controlling an optical delay line interferometer includes the steps of,
s1, initially, in the process of receiving optical signals and decoding data at a receiving end, calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction method0；
S2, setting the current bias voltage value of the optical delay line interferometer in the receiving end to be V + delta V, and after the preset time period T, calculating the communication bit error rate BER of the receiving end in the preset time period T based on a forward error correction method1(ii) a Wherein, V is a preset initial bias value, and DeltaV is a preset voltage adjustment quantity;
s3, calculating the BERiBER of communication error ratei-1BER of communication bit error rate difference betweeni_i-1(ii) a Wherein BERi_i-1＝BERi-BERi-1，i＝1,2,3,...；
S4, according to the communication bit error rate difference BERi_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER;
s5, determining the BER according to the communication bit error rate differencei_i-1Under the condition that the current bias value of the optical delay line interferometer is adjusted through the relation between the communication error rate Delta BER and the preset communication error rate Delta BER, after the preset time period T, the communication error rate BER of the receiving end in the preset time period T is calculated based on a forward error correction methodi+1；
S6, i is made to be i +1, and the steps S3 to S5 are iteratively executed in a loop until the current bias voltage value of the optical delay line interferometer is stable.
The invention provides a control method of an optical delay line interferometer, which is mainly applied to a laser communication system using an optical differential phase shift keying technology system or an optical differential quadrature phase shift keying technology system and aims to realize accurate and automatic control of bias voltage of the optical delay line interferometer, so that the optical delay line interferometer can dynamically keep a good optical signal demodulation state and complete data receiving of laser communication with better performance.
The method of the invention is implemented on the premise that in actual use, the bias voltage of the optical delay line interferometer determines a value (preset initial bias voltage value V) close to the optimal working point by other technical means, then the method of the invention continuously completes further optimization of the bias voltage, and keeps the dynamic change of the bias voltage according to the wavelength change characteristics of the optical signal received by the optical delay line interferometer and the refractive index jitter of the device, so that the optical delay line interferometer always works in the optimal demodulation state.
There are various technical means to determine the preset initial bias voltage V of the optical delay line interferometer. Such as: starting with an initial bias value recommended by the optical delay line interferometer, gradually increasing the bias voltage, monitoring an optical signal output by the optical delay line interferometer through a balance detector, and when the output signal of the balance detector is relatively maximum, the bias voltage at the moment is a preset initial bias value V. For another example: the method of tuning an optical delay line interferometer by a reference laser having a mathematical relationship to the wavelength of the signal light to find the preset initial bias voltage V is described in the' 202110759907.6 patent. The above methods for determining the preset initial bias voltage V are not important for the explanation of the present invention, but only as a premise for the functioning of the present invention, and therefore, will not be described in detail.
The optical delay line interferometer control method is implemented based on forward error correction, firstly, a communication error rate is calculated by utilizing a forward error correction mode, the forward error correction is a method which is commonly used in communication and is used for increasing the reliability of data communication, redundant codes with the characteristics of signals are added into data codes according to a certain algorithm, when data are received, the received data are decoded at a receiving end according to the corresponding algorithm, and when errors occur in the transmitted data, the errors can be found and corrected. Based on the characteristic of forward error correction, the specific method for calculating the bit error rate in the invention is as follows:
in the Data transmission of the spatial laser communication, Rb is defined as the number of bits that can be transmitted per second, and the total Data amount to be transmitted in the preset time period T can be represented as Data Rb T.
For convenience of data transmission and reception, data is packetized at the transmitting end, one packet is called a frame, the number of bits included in each frame of data is fixed and is denoted by Dfb, the transmitting end of laser communication transmits data in the form of a data frame, and the receiving end similarly decodes data in the unit of a frame. Still taking the preset time interval T as a unit to count the received data, and due to various factors, three data damages can occur in the data transmission process of the space laser communication; firstly, a data frame is received, but the information contained in the data frame may be damaged, the Bit stream in the data frame is not always correct, at this time, forward error correction plays a role, and the wrong bits are corrected, so that the number of bits corrected by forward error correction can be counted in a preset time period T and is recorded as FEC _ Bit; secondly, the data frame is received, the ratio of information contained in the data frame to be destroyed is large, and the information is beyond the decoding capability of forward error correction, at this time, the quantity of the destroyed information of the data frame cannot be determined, the data frame can be considered to be completely destroyed, and the number of the frames in the situation is marked as m; thirdly, the condition that the whole frame of the data frame is lost can also occur in the process of receiving the data, and at the moment, the receiving end can also judge the total number n of the lost frames; in three cases, the total number of error bits is calculated by: ErrorBit ═ FEC _ Bit + (m + n) × Dfb;
within the preset time period T, the reception error rate is,
Figure BDA0003490828830000071
specifically, calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction methodi-1The formula of (a) is as follows,
Figure BDA0003490828830000072
wherein, FEC _ Biti-1In the process of the i-1 st iteration, after the receiving end receives the data frame, the bit number corrected by forward error correction in the decoding process is carried out through the forward error correction; m isi-1In the process of the i-1 iteration, the receiving end receives the damaged frame number which exceeds the forward error correction decoding capability after receiving the data frame; n isi-1In the process of the i-1 iteration, the number of the lost frames of the whole frame in the process of receiving data by the receiving end; dfb is the number of bits contained in each frame of data received by the receiving end; rb is the number of bits transmitted per second; and T is the preset time period.
When the link of the space laser communication is established, data transmission is started, and the error rate calculated based on the method can be used as a basis for accurately and automatically controlling the bias voltage of the optical delay line interferometer, and the method comprises the following steps:
(1) determining the frequency f controlled by the bias voltage of the optical delay line interferometer, wherein the frequency f is matched with a time interval (preset time period T) for calculating the error rate, namely f is 1/T;
(2) the receiving end starts to receive optical signals, performs data decoding, and calculates initial communication bit error rate BER after a preset time period T0；
(3) Increasing or decreasing a preset voltage adjustment amount Δ V, for example, increasing, starting from a preset initial bias voltage value V, where the bias voltage of the optical delay line interferometer is changed to V + Δ V;
(4) after a preset time period T, calculating a first communication bit error rate BER1；
(5) Calculating BER1-BER0；
(6) If BER1-BER0When the current bias voltage value of the optical delay line interferometer is larger than the delta BER, the current bias voltage value of the optical delay line interferometer is increased by a preset voltage adjustment quantity delta V, the bit error rate is larger, the decoding state is worse, and at the moment, the current bias voltage value of the optical delay line interferometer needs to be reduced by a preset voltage adjustment quantity delta V; otherwise, if BER1-BER0When the current bias voltage value of the optical delay line interferometer is smaller than the-delta BER, the current bias voltage value of the optical delay line interferometer is increased by a preset voltage adjustment quantity delta V, and the bit error rate is reduced;
(7) after the current bias voltage value of the optical delay line interferometer is adjusted and a preset time period T is passed, calculating a second communication bit error rate BER2And calculate BER2-BER1Repeating the judgment condition of (6) and so on, and calculating BERi-BERi-1Determining whether a preset voltage adjustment quantity delta V is increased or decreased on the basis of the current bias voltage by the optical delay line interferometer;
(8) after multiple cycle iterative control, the bias voltage of the optical delay line interferometer can be stabilized at a certain value V0Nearby, when the bit error rate of the receiving end is kept in a relatively minimum state, namely BERi-BERi-1≦ Δ BER |, which indicates that the optical delay line interferometer has operated at the optimal bias point; the principle of bias voltage adjustment for an optical delay line interferometer is shown in FIG. 2, where ViIs the current bias value of the optical delay line interferometer.
In conclusion, BER is determined according to communication bit error rate differencei_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER, which specifically comprises the following steps: if BERi_i-1＞ΔBER，Reducing the current bias voltage value of the optical delay line interferometer by a preset voltage adjustment amount delta V; if BERi_i-1If the current bias voltage value is less than the-Delta BER, increasing the current bias voltage value of the optical delay line interferometer by a preset voltage adjustment quantity Delta V; if-Delta BER is less than or equal to BERi_i-1And ≦ Δ BER, the current bias voltage value of the optical delay line interferometer is kept unchanged.
Description of Δ BER: when the optical delay line interferometer works at the optimal bias point, and simultaneously the received effective signal power of laser communication is the minimum optical power allowed by the receiving end, namely the signal optical power is the sensitivity level of the receiving end, the bit error rate can fluctuate within a certain range, the fluctuation range is marked as delta BER, the system bit error rate is considered as the inherent error, the value can be 0, and other values can also be obtained through the actual test of a specific laser communication system.
It should be noted that the preset time period T may be determined according to an actual situation, and the following factors may be considered in determining the preset time period T, where one is a time responsivity of the optical delay line interferometer, and is sufficient to respond to a change of the bias voltage within the preset time period T, and another is a fluctuation degree of the bit error rate of the receiving end, and if the bit error rate fluctuation is large, the preset time period T is appropriately reduced under an allowance of the optical delay line interferometer, and if the bit error rate fluctuation is small, the preset time period T may be appropriately increased. Generally, the calculation period of the error rate is 1 second, and the control frequency of the bias voltage of the optical delay line interferometer may be higher than 1 second once, or lower than 1 second for 1 time, or 1 second for 1 time.
The value of the preset voltage adjustment quantity delta V also depends on the parameter characteristics of the optical delay line interferometer device, and the adjustment magnitude can be divided into two values of coarse adjustment and fine adjustment.
The invention relates to a control method of an optical delay line interferometer, which mainly solves the following two problems:
firstly, the problem of accurate calculation of the bit error rate is solved. The invention adopts a forward error correction mode to decode the coded laser signal received by the laser communication receiving end, the mode can decode the received signal according to a corresponding algorithm and find out error codes generated in the transmission process, meanwhile, the phenomenon of loss of the whole frame of transmitted data can also occur in the laser communication process, and the error rate of the time period can be accurately calculated by adding the number of the error codes in a certain time period to the data quantity of the lost frame, and the error rate is used as the control basis of the bias voltage of the optical delay line interferometer.
And secondly, the problem of dynamic and accurate control of the bias voltage of the optical delay line interferometer is solved. And the bias voltage automatic control based on the error rate can dynamically keep the optical delay line interferometer in a demodulation state with low error rate continuously, so that the error rate is optimized.
Based on the control method of the optical delay line interferometer, the invention also provides a control system of the optical delay line interferometer.
As shown in fig. 3, an optical delay line interferometer control system includes the following modules,
communication bit error rate BER0A calculating module, configured to initially calculate, during a process of receiving an optical signal and performing data decoding at a receiving end, a communication bit error rate BER of the receiving end within a preset time period T based on a forward error correction method0；
Communication bit error rate BER1A calculating module, configured to set a current bias value of the optical delay line interferometer in the receiving end to V + Δ V, and calculate a communication bit error rate BER of the receiving end in the preset time period T based on a forward error correction method after the preset time period T elapses1(ii) a Wherein, V is a preset initial bias value, and DeltaV is a preset voltage adjustment quantity;
communication bit error rate difference BERi_i-1A calculation module for calculating a communication bit error rate BERiBER of communication error ratei-1BER of communication bit error rate difference betweeni_i-1(ii) a Wherein BERi_i-1＝BERi-BERi-1，i＝1,2,3,...；
A bias value adjusting module for adjusting BER according to communication bit error rate differencei_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER;
communication bit error rate BERi+1A calculation module for calculating the BER according to the communication bit error rate differencei_i-1Under the condition that the current bias value of the optical delay line interferometer is adjusted through the relation between the communication error rate Delta BER and the preset communication error rate Delta BER, after the preset time period T, the communication error rate BER of the receiving end in the preset time period T is calculated based on a forward error correction methodi+1；
A loop iteration module for making i ═ i +1 and performing loop iteration on the communication bit error rate difference BERi_i-1Calculating a BER from a module to the communication bit error ratei+1And a calculation module until the current bias voltage value of the optical delay line interferometer is stable.
The specific functions of the modules in the control system of the optical delay line interferometer of the present invention refer to the corresponding specific steps in the control method of the optical delay line interferometer of the present invention, and are not described herein again.
Based on the control method of the optical delay line interferometer, the invention also provides a computer.
A computer, characterized by: comprising a processor, a memory and a computer program stored in the memory, which computer program, when executed by the processor, implements the optical delay line interferometer control method as described above.
In the control method, the system and the computer of the optical delay line interferometer, the error rate of a receiving end can be directly and accurately calculated under the condition of transmitting unknown data based on forward error correction, and the decoding condition of the receiving end is accurately evaluated; and then, the bias voltage of the optical delay line interferometer can be dynamically and accurately controlled through the accurately calculated error rate, so that the method has strong operability, the time is kept in the optimal working state, the application effect of a control algorithm is greatly improved, and the method has great significance for improving the performance of space laser communication.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A method of controlling an optical delay line interferometer, comprising: comprises the following steps of (a) carrying out,
s1, initially, in the process of receiving optical signals and decoding data at a receiving end, calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction method0；
S2, setting the current bias voltage value of the optical delay line interferometer in the receiving end to be V + delta V, and after the preset time period T, calculating the communication bit error rate BER of the receiving end in the preset time period T based on a forward error correction method1(ii) a Wherein, V is a preset initial bias value, and DeltaV is a preset voltage adjustment quantity;
s3, calculating the BERiBER (bit error Rate) of communicationi-1BER of communication bit error rate difference betweeni_i-1(ii) a Wherein BERi_i-1＝BERi-BERi-1，i＝1,2,3,...；
S4, according to the communication bit error rate difference BERi_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER;
s5, determining the BER according to the communication bit error rate differencei_i-1Under the condition that the current bias value of the optical delay line interferometer is adjusted through the relation between the communication error rate Delta BER and the preset communication error rate Delta BER, after the preset time period T, the communication error rate BER of the receiving end in the preset time period T is calculated based on a forward error correction methodi+1；
S6, i is made to be i +1, and the steps S3 to S5 are iteratively executed in a loop until the current bias voltage value of the optical delay line interferometer is stable.
2. The optical delay line interferometer control method of claim 1, wherein: BER according to communication bit error rate differencei_i-1The relation between the current bias voltage value and the preset communication bit error rate Delta BER adjusts the current bias voltage value of the optical delay line interferometer, specifically,
if BERi_i-1If the current bias voltage value of the optical delay line interferometer is larger than delta BER, reducing the current bias voltage value of the optical delay line interferometer by a preset voltage adjustment quantity delta V;
if BERi_i-1If the current bias voltage value of the optical delay line interferometer is less than-delta BER, increasing a preset voltage adjustment value delta V;
if-Delta BER is less than or equal to BERi_i-1And ≦ Δ BER, the current bias voltage value of the optical delay line interferometer is kept unchanged.
3. The optical delay line interferometer control method of claim 1 or 2, wherein: calculating the communication bit error rate BER of the receiving end in a preset time period T based on a forward error correction methodi-1The formula of (a) is as follows,
Figure FDA0003490828820000021
wherein, FEC _ Biti-1In the process of the i-1 st iteration, after the receiving end receives the data frame, the bit number corrected by forward error correction in the decoding process is carried out through the forward error correction; m isi-1In the process of the i-1 iteration, the receiving end receives the damaged frame number which exceeds the forward error correction decoding capability after receiving the data frame; n isi-1In the process of the i-1 iteration, the number of the lost frames of the whole frame in the process of receiving data by the receiving end; dfb is the number of bits contained in each frame of data received by the receiving end; rb is the number of bits transmitted per second; and T is the preset time period.
4. The optical delay line interferometer control method of claim 1 or 2, wherein: the optical delay line interferometer control method is applied to space laser communication of an optical differential phase shift keying system or an optical differential quadrature phase shift keying system.
5. An optical delay line interferometer control system, characterized by: comprises the following modules which are used for realizing the functions of the system,
communication bit error rate BER0A calculating module, configured to initially calculate, during a process of receiving an optical signal and performing data decoding at a receiving end, a communication bit error rate BER of the receiving end within a preset time period T based on a forward error correction method0；
Communication bit error rate BER1A calculating module, configured to set a current bias value of the optical delay line interferometer in the receiving end to V + Δ V, and calculate a communication bit error rate BER of the receiving end in the preset time period T based on a forward error correction method after the preset time period T elapses1(ii) a Wherein, V is a preset initial bias value, and DeltaV is a preset voltage adjustment quantity;
communication bit error rate difference BERi_i-1A calculation module for calculating a communication bit error rate BERiBER of communication error ratei-1BER of communication bit error rate difference betweeni_i-1(ii) a Wherein BERi_i-1＝BERi-BERi-1，i＝1,2,3,...；
A bias value adjusting module for adjusting BER according to communication bit error rate differencei_i-1Adjusting the current bias voltage value of the optical delay line interferometer according to the relation between the current bias voltage value and a preset communication bit error rate delta BER;
communication bit error rate BERi+1A calculation module for calculating the BER according to the communication bit error rate differencei_i-1Under the condition that the current bias value of the optical delay line interferometer is adjusted through the relation between the communication error rate Delta BER and the preset communication error rate Delta BER, after the preset time period T, the communication error rate BER of the receiving end in the preset time period T is calculated based on a forward error correction methodi+1；
A loop iteration module for making i ═ i +1 and performing loop iteration on the communication bit error rate difference BERi_i-1Calculating a BER from a module to the communication bit error ratei+1And a calculation module until the current bias voltage value of the optical delay line interferometer is stable.
6. A computer, characterized by: comprising a processor, a memory and a computer program stored in the memory, which computer program, when executed by the processor, implements the optical delay line interferometer control method of any of claims 1 to 4.
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