Method, device and equipment for controlling laser parameters of laser in coherent laser communication

Abstract

The invention provides a laser parameter control method, device and equipment for a laser in coherent laser communication, the laser comprises a light emitting diode, a first thermistor and a thermoelectric refrigerating unit, and a second thermistor is arranged on the surface of a shell of the laser. The method comprises the following steps: acquiring a first temperature of a light emitting diode acquired by a first thermistor and a second temperature of a shell surface acquired by a second thermistor; determining a target temperature of the light emitting diode based on the second temperature; determining a magnitude relationship between the first temperature and a target temperature; and the thermoelectric refrigerating unit is controlled based on the size relationship, and the temperature of the light emitting diode is adjusted to the target temperature so as to stabilize the laser parameters, so that the temperature of the light emitting diode can be adjusted to the target temperature according to the second temperature even if the low-orbit satellite platform is in a relatively wide temperature range, and the stability of the laser parameters is ensured. The laser parameter offset is reduced or avoided, and the normal establishment of a communication link is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of coherent laser communication, and in particular to a laser parameter control method, device and equipment for a laser in coherent laser communication. Background Art

[0002] Lasers are the core components of coherent laser communication. The modulation end uses the signal to be transmitted to change the phase of the optical carrier, which requires the optical signal to have a stable frequency. The receiving end uses a beam of laser generated by a local oscillator to mix with the input signal light in an optical mixer to obtain an intermediate frequency signal whose frequency, phase and amplitude change in the same way as the signal light. Therefore, the frequency stability of narrow linewidth lasers plays a vital role in the quality of coherent communication.

[0003] When the ambient temperature is fixed, there is a linear conversion relationship between the output frequency of the laser and the core temperature. According to the conversion relationship, the laser core temperature can be controlled at a fixed value according to the required operating frequency to achieve stable control of a certain frequency.

[0004] However, when a satellite is in orbit, it is affected by direct sunlight and the Earth's shadow. The ambient temperature of the satellite is extreme and varies greatly (for example, the surface temperature of the sun-facing side of a low-orbit satellite may be as high as 121 degrees Celsius or even higher, such as 500K (about 227 degrees Celsius), while the temperature of the sun-facing side may drop sharply to -157 degrees Celsius or even lower). The low-orbit satellite platform is in a wide temperature range. The laser body is affected by the ambient temperature, and the laser frequency will shift, which may cause the communication link to fail to be established normally. Summary of the invention

[0005] The present invention provides a laser parameter control method, device and equipment for a laser in coherent laser communication, so as to solve the technical problem in the prior art that the laser parameters cannot be maintained stable during the coherent laser communication process.

[0006] On the one hand, the present invention provides a laser parameter control method of a laser in coherent laser communication, wherein the laser comprises a light emitting diode, a first thermistor and a thermoelectric cooler, and a second thermistor is disposed on the surface of a housing of the laser, and the control method comprises: Acquire a first temperature of the light emitting diode collected by the first thermistor and a second temperature of the housing surface collected by the second thermistor; determining a target temperature of the light emitting diode based on the second temperature; Determine a magnitude relationship between the first temperature and the target temperature; The thermoelectric cooler is controlled based on the magnitude relationship to adjust the temperature of the light emitting diode to the target temperature to stabilize the laser parameters.

[0007] According to a laser parameter control method for a laser in coherent laser communication provided by the present invention, determining a target temperature of the light emitting diode based on the second temperature includes: Acquire a pre-established laser parameter matching table; wherein the laser parameter matching table contains a correspondence between laser parameters, a diode temperature of the light-emitting diode, and a shell temperature of the shell surface; Comparing the second temperature with each of the shell temperatures in the laser parameter matching table to determine a shell temperature closest to the second temperature; Based on the corresponding relationship, a diode temperature corresponding to the closest shell temperature is determined as a target temperature of the light emitting diode.

[0008] According to a laser parameter control method for a laser in coherent laser communication provided by the present invention, the laser parameter matching table is established in the following manner: Controlling the temperature simulation device to simulate various ambient temperatures of the environment where the laser is located; Recording the temperature collected by the second thermistor at each of the ambient temperatures, and the temperature collected by the first thermistor when the laser parameters are within a preset parameter range; A correspondence between the laser parameters within the preset parameter range, the temperature collected by the second thermistor, and the temperature collected by the first thermistor is established to obtain the laser parameter matching table.

[0009] According to a laser parameter control method of a laser in coherent laser communication provided by the present invention, the second thermistor is connected in series with the first resistor; the first resistor is connected to a first reference voltage; the first analog-to-digital converter is connected between the second thermistor and the first resistor; The resistance of the second thermistor is measured by: Where X is the sampling result of the first analog-to-digital converter, which is an unsigned number, and V adcref is the sampling reference voltage of the first analog-to-digital converter, M is the resolution of the first analog-to-digital converter, V adc is the sampled voltage value of the first analog-to-digital converter; V1 is the voltage value of the first reference voltage, R case is the resistance value of the second thermistor, and R1 is the resistance value of the first resistor.

[0010] According to a laser parameter control method of a laser in coherent laser communication provided by the present invention, the first thermistor is connected in series with the second resistor; the third resistor is connected in series with the fourth resistor, and is connected in parallel with the first thermistor and the second resistor connected in series; the P terminal of the second analog-to-digital converter is connected between the third resistor and the fourth resistor, and the N terminal is connected between the first thermistor and the second resistor, and the second analog-to-digital converter is a differential analog-to-digital converter; the resistance values ​​of the second resistor, the third resistor and the fourth resistor are equal; The resistance of the first thermistor is measured by: Wherein, SX is the sampling result of the second analog-to-digital converter, which is a signed number, N is the resolution of the second analog-to-digital converter, V ref is the reference voltage of the second analog-to-digital converter, and V is the sampling voltage of the second analog-to-digital converter; R NTC is the resistance value of the first thermistor; R N is the resistance value of the second resistor, the third resistor or the fourth resistor.

[0011] According to a method for controlling laser parameters of a laser in coherent laser communication provided by the present invention, the laser parameters include laser frequency and / or laser wavelength.

[0012] According to a laser parameter control method of a laser in coherent laser communication provided by the present invention, the second thermistor is a MF501 thermistor; The first thermistor is a negative temperature coefficient thermistor.

[0013] According to a laser parameter control method of a laser in coherent laser communication provided by the present invention, the temperature simulation device is a high and low temperature box.

[0014] On the other hand, the present invention also provides a laser parameter control device for a laser in coherent laser communication, wherein the laser comprises a light emitting diode, a first thermistor and a thermoelectric cooler, and a second thermistor is arranged on the surface of the shell of the laser, and the control device comprises: A temperature acquisition module, used to acquire a first temperature of the light emitting diode acquired by the first thermistor and a second temperature of the housing surface acquired by the second thermistor; a temperature determination module, configured to determine a target temperature of the light emitting diode based on the second temperature; A temperature comparison module, used to determine the magnitude relationship between the first temperature and the target temperature; A parameter control module is used to control the thermoelectric cooler based on the size relationship to adjust the temperature of the light emitting diode to the target temperature so as to stabilize the laser parameters.

[0015] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a laser parameter control method for a laser in coherent laser communication as described above is implemented.

[0016] The laser parameter control method, device and equipment of the laser in the coherent laser communication provided by the present invention obtain the first temperature of the light-emitting diode collected by the first thermistor and the second temperature of the shell surface collected by the second thermistor; determine the target temperature of the light-emitting diode based on the second temperature; determine the relationship between the first temperature and the target temperature; control the thermoelectric cooler based on the relationship, and adjust the temperature of the light-emitting diode to the target temperature to stabilize the laser parameters. Even if the low-orbit satellite platform is in a wide temperature range, the temperature of the light-emitting diode can be adjusted to the target temperature according to the second temperature (the second temperature can be regarded as the ambient temperature), thereby ensuring the stability of the laser parameters, reducing or avoiding the deviation of the laser parameters, and ensuring the normal establishment of the communication link. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of a laser parameter control method of a laser in coherent laser communication provided by an embodiment of the present invention; Figure 2 is a schematic diagram of a connection method of a second thermistor provided in an embodiment of the present invention; Figure 3 is a schematic diagram of a connection method of a first thermistor provided in an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a laser parameter control device for a laser in coherent laser communication provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Figure 1 The present invention provides a flow chart of a laser parameter control method for a laser in coherent laser communication. The execution subject of the laser parameter control method can be a computer, a mobile phone, a smart wearable device, etc.

[0021] The laser may include a light emitting diode, a first thermistor and a thermoelectric cooler, and a second thermistor is provided on the surface of the outer shell of the laser. The laser may also include a photodiode. The light emitting diode is a semiconductor laser responsible for generating a laser beam. The first thermistor is used for temperature monitoring to ensure that the laser operates under safe and stable conditions. Thermoelectric cooler, also known as semiconductor cooler, is a device that uses thermoelectric effect for cooling. In the laser, it is used to control the temperature of the laser to maintain the stable operation of the laser. The photodiode is a photoelectric detection device that can convert the received optical signal into an electrical signal. In the laser system, it is often used to monitor the laser output and for feedback control system to adjust the working state of the laser.

[0022] See also Figure 1 , a method for controlling laser parameters of a laser in coherent laser communication may include the following steps 101 to 104.

[0023] 101. Obtain a first temperature of a light emitting diode collected by a first thermistor and a second temperature of a housing surface collected by a second thermistor.

[0024] In this step, if Figure 2 As shown, the second thermistor is connected in series with the first resistor; the first resistor is connected to a first reference voltage; and the first analog-to-digital converter is connected between the second thermistor and the first resistor. The resistance value of the second thermistor is measured in the following manner, which can be referred to in the following formulas (1) to (4).

[0025] V adc =X / (2 M )*V adcref (1); V adc =V1*(R case / (R1+R case ))(2); X / (2 M)*V adcref= V1*(R case / (R1+R case ))(3); R case =(R1*2 M ) / ((X*V adcref *V1)–2 M )(4).

[0026] Where X is the sampling result of the first analog-to-digital converter, which is an unsigned number, and V adcref is the sampling reference voltage of the first analog-to-digital converter, M is the resolution of the first analog-to-digital converter, V adc is the sampling voltage value of the first analog-to-digital converter. V1 is the voltage value of the first reference voltage, R case is the resistance value of the second thermistor, and R1 is the resistance value of the first resistor. case The second temperature can be obtained. The voltage value of the first reference voltage can be 3.3V.

[0027] The laser housing temperature measuring resistor uses a second thermistor, with a resistance of 5KΩ at 25°C. However, the laser housing has no temperature control measures. Affected by the ambient temperature, the actual operating temperature ranges from -20°C to 45°C, and the resistance value varies from 2.1K to 54K. The bridge temperature measurement in the tube core cannot be used. Therefore, the above-mentioned voltage-dividing temperature measurement method is used. The resistance value of the first resistor can be 10K.

[0028] like Figure 3 As shown, the first thermistor is connected in series with the second resistor; the third resistor is connected in series with the fourth resistor, and is connected in parallel with the first thermistor and the second resistor connected in series; the P terminal of the second analog-to-digital converter is connected between the third resistor and the fourth resistor, and the N terminal is connected between the first thermistor and the second resistor, and the second analog-to-digital converter is a differential analog-to-digital converter; the resistance values ​​of the second resistor, the third resistor and the fourth resistor are equal; the resistance value of the first thermistor is measured by the following method, which can be seen from the following formulas (5) to (8).

[0029] V=(SX / (2 (N-1) ))*V ref (5); V=V ref / 2-V ref *(R NTC ) / (R N +(R NTC ))(6); V ref / 2-V ref *(R NTC) / (R N +(R NTC ))=(SX / (2 (N-1) ))*V ref (7); R NTC =R N *((SX-2 (N-2) ) / (3*2 (N-2) -SX))(8).

[0030] Wherein, SX is the sampling result of the second analog-to-digital converter, which is a signed number, N is the resolution of the second analog-to-digital converter, V ref is the reference voltage of the second analog-to-digital converter, and V is the sampling voltage of the second analog-to-digital converter. NTC is the resistance value of the first thermistor; R N is the resistance value of the second resistor, the third resistor or the fourth resistor. Based on the resistance value R of the first thermistor NTC A first temperature may be obtained.

[0031] The resistance range corresponding to the working temperature of the first thermistor inside the laser is 10KΩ±2KΩ, and the temperature measurement method of the first thermistor can be regarded as bridge temperature measurement. The second resistor, the third resistor and the fourth resistor are all low temperature drift resistors to ensure the accuracy of the measurement value. The resistance value of the second resistor, the third resistor and the fourth resistor can be 10K.

[0032] 102. Determine a target temperature of the light emitting diode based on the second temperature.

[0033] In this step, determining the target temperature of the light emitting diode based on the second temperature may include: Acquire a pre-established laser parameter matching table; wherein the laser parameter matching table contains a correspondence between laser parameters, a diode temperature of the light-emitting diode, and a shell temperature of the shell surface; Comparing the second temperature with each of the shell temperatures in the laser parameter matching table to determine a shell temperature closest to the second temperature; Based on the corresponding relationship, a diode temperature corresponding to the closest shell temperature is determined as a target temperature of the light emitting diode.

[0034] 103. Determine the relationship between the first temperature and the target temperature.

[0035] 104. Based on the size relationship, the thermoelectric cooler is controlled to adjust the temperature of the light emitting diode to the target temperature to stabilize the laser parameters.

[0036] In this step, when the first temperature is greater than the target temperature, the thermoelectric cooler can be controlled to cool the light emitting diode; when the first temperature is less than the target temperature, the thermoelectric cooler can be controlled to heat the light emitting diode. The laser parameters may include the laser frequency and / or the laser wavelength.

[0037] In this embodiment, a first temperature of the light-emitting diode collected by a first thermistor and a second temperature of the housing surface collected by a second thermistor are obtained; based on the second temperature, a target temperature of the light-emitting diode is determined; the relationship between the first temperature and the target temperature is determined; based on the relationship, a thermoelectric cooler is controlled to adjust the temperature of the light-emitting diode to the target temperature to stabilize the laser parameters, thereby achieving the goal of adjusting the temperature of the light-emitting diode to the target temperature according to the second temperature (the second temperature can be regarded as the ambient temperature) even when the low-orbit satellite platform is in a wider temperature range, thereby ensuring the stability of the laser parameters, reducing or avoiding the deviation of the laser parameters, and ensuring the normal establishment of the communication link.

[0038] In one embodiment of this specification, the laser parameter matching table is established in the following manner: Controlling the temperature simulation device to simulate various ambient temperatures of the environment where the laser is located; Recording the temperature collected by the second thermistor at each of the ambient temperatures, and the temperature collected by the first thermistor when the laser parameters are within a preset parameter range; A correspondence between the laser parameters within the preset parameter range, the temperature collected by the second thermistor, and the temperature collected by the first thermistor is established to obtain the laser parameter matching table.

[0039] In this embodiment, by accurately recording the operating temperature of the laser at different ambient temperatures, the operating state of the laser can be more accurately controlled to ensure the stability of the laser parameters. Since the laser operates at different ambient temperatures, its performance may be different. By simulating various ambient temperatures and recording the corresponding operating temperatures, it can be ensured that the laser can operate stably under various temperature conditions. By recording the temperature when the laser parameters are within the preset parameter range, it can be ensured that the laser always remains within the optimal performance range during operation. By establishing a laser parameter matching table, the thermoelectric cooler can be automatically adjusted through an automated control system (such as a PID controller) to respond to ambient temperature changes and keep the temperature of the laser stable.

[0040] In one embodiment of the present specification, the second thermistor is a MF501 thermistor; The first thermistor is a negative temperature coefficient thermistor.

[0041] In this embodiment, the MF501 thermistor has high sensitivity and accuracy, can provide accurate temperature measurement results, meet the requirements of various precision control systems, and the power consumption of the MF501 thermistor is very low, almost negligible, and will not have a significant impact on the energy consumption of the entire system. The negative temperature coefficient thermistor is very sensitive to changes in ambient temperature and can quickly reflect temperature changes. In addition, it can be miniaturized and easily integrated into various devices, occupying a small space.

[0042] In one embodiment of the present specification, the temperature simulation device is a high and low temperature box.

[0043] In this embodiment, the high and low temperature box has good temperature stability and uniformity by optimizing the design of the refrigeration and heating systems, and is simple and convenient to operate. Users can easily set test parameters and control the test process through a touch screen or a computer. It has complete safety protection devices, such as over-temperature protection, leakage protection, etc., to ensure the safety of operators and equipment.

[0044] The technical effects of the present invention are explained below through some specific examples. See Table 1 and Table 2. Laser 1 and Laser 2 in Table 1 belong to the offset of laser wavelength and laser frequency at different temperatures when the solution of the present invention is not adopted (it can also be understood that the second thermistor is not set, and the temperature of the light-emitting diode is controlled according to the first thermistor). In other words, Table 1 shows that two groups of devices, negative temperature coefficient thermistor (NTC) and thermoelectric cooler (TEC), are integrated inside the tube core of laser 1 and laser 2. The controller collects NTC data and controls the TEC closed loop to keep the temperature inside the tube core in a constant state to achieve the goal of frequency stability. However, affected by the ambient temperature, the laser frequency and laser wavelength of the narrow linewidth laser at the same tube core temperature have relatively large offsets.

[0045] Laser 1 and Laser 2 in Table 2 belong to the offset of laser wavelength and laser frequency at different temperatures under the scheme of the present invention (which can also be understood as obtaining the first temperature of the light-emitting diode collected by the first thermistor and the second temperature of the shell surface collected by the second thermistor; determining the target temperature of the light-emitting diode based on the second temperature; determining the magnitude relationship between the first temperature and the target temperature; controlling the thermoelectric cooler based on the magnitude relationship to adjust the temperature of the light-emitting diode to the target temperature). In other words, the second temperature of the shell surface collected by the second thermistor can be used as a compensation amount for adjusting the collection temperature of the first thermistor.

[0046] Table 1

[0047] Table 2

[0048] By comparing the laser wavelength and laser frequency offset of laser 1 and laser 2 in Table 1 and Table 2, it can be found that in the present invention, the maximum error of the frequency output by the laser can be controlled within 150MHz in the ambient temperature range of -20~45℃, compared with the maximum error of 1150MHz before using this control technology, the frequency stability and wavelength stability in a wide temperature range have been greatly improved, which can provide higher reliability and stability for the establishment and maintenance of coherent laser communication links. The present invention can adapt to a wider temperature coherent laser communication system, can reduce the requirements of the payload for the thermal control capability of the satellite platform, and realize the rapid establishment and stable maintenance of the coherent laser communication link in a wider temperature range.

[0049] Based on the same general inventive concept, the present invention also protects a laser parameter control device for a laser in coherent laser communication, such as Figure 4 As shown, Figure 4 It is a schematic diagram of the structure of the laser parameter control device of the laser in the coherent laser communication provided by the embodiment of the present invention. The laser parameter control device of the laser in the coherent laser communication provided by the present invention is described below. The laser parameter control device of the laser in the coherent laser communication described below and the laser parameter control method of the laser in the coherent laser communication described above can be referred to each other. The laser includes a light emitting diode, a first thermistor and a thermoelectric cooler, and a second thermistor is arranged on the surface of the shell of the laser.

[0050] The laser parameter control device of a laser in coherent laser communication may include a temperature acquisition module 401 , a temperature determination module 402 , a temperature comparison module 403 and a parameter control module 404 .

[0051] The temperature acquisition module 401 is used to acquire a first temperature of the light emitting diode acquired by the first thermistor and a second temperature of the housing surface acquired by the second thermistor; The temperature determination module 402 is used to determine the target temperature of the light emitting diode based on the second temperature; The temperature comparison module 403 is used to determine the magnitude relationship between the first temperature and the target temperature; The parameter control module 404 is used to control the thermoelectric cooler based on the magnitude relationship to adjust the temperature of the light emitting diode to the target temperature so as to stabilize the laser parameters.

[0052] Figure 5 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0053] like Figure 5As shown, the electronic device may include: a processor 510, a communications interface 520, a memory 530 and a communication bus 540, wherein the processor 510, the communications interface 520 and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the laser parameter control method of the laser in the coherent laser communication.

[0054] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0055] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the laser parameter control method of the laser in the coherent laser communication provided by the above methods.

[0056] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the laser parameter control method of a laser in coherent laser communication provided by the above-mentioned methods.

[0057] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0058] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling laser parameters of a laser in coherent laser communication, characterized in that: The laser comprises a light emitting diode, a first thermistor and a thermoelectric cooler, and a second thermistor is arranged on the surface of a housing of the laser, and the control method comprises: Acquire a first temperature of the light emitting diode collected by the first thermistor and a second temperature of the housing surface collected by the second thermistor; determining a target temperature of the light emitting diode based on the second temperature; Determine a magnitude relationship between the first temperature and the target temperature; The thermoelectric cooler is controlled based on the magnitude relationship to adjust the temperature of the light emitting diode to the target temperature to stabilize the laser parameters.

2. The laser parameter control method of a laser in coherent laser communication according to claim 1, characterized in that: The step of determining a target temperature of the light emitting diode based on the second temperature includes: Acquire a pre-established laser parameter matching table; wherein the laser parameter matching table contains a correspondence between laser parameters, a diode temperature of the light-emitting diode, and a shell temperature of the shell surface; Comparing the second temperature with each of the shell temperatures in the laser parameter matching table to determine a shell temperature closest to the second temperature; Based on the corresponding relationship, a diode temperature corresponding to the closest shell temperature is determined as a target temperature of the light emitting diode.

3. The laser parameter control method of a laser in coherent laser communication according to claim 2, characterized in that: The laser parameter matching table is established in the following manner: Controlling the temperature simulation device to simulate various ambient temperatures of the environment where the laser is located; Recording the temperature collected by the second thermistor at each of the ambient temperatures, and the temperature collected by the first thermistor when the laser parameters are within a preset parameter range; A correspondence between the laser parameters within the preset parameter range, the temperature collected by the second thermistor, and the temperature collected by the first thermistor is established to obtain the laser parameter matching table.

4. The laser parameter control method of a laser in coherent laser communication according to claim 1, characterized in that: The second thermistor is connected in series with the first resistor; the first resistor is connected to a first reference voltage; the first analog-to-digital converter is connected between the second thermistor and the first resistor; The resistance of the second thermistor is measured by: Where X is the sampling result of the first analog-to-digital converter, which is an unsigned number, and V adcref is the sampling reference voltage of the first analog-to-digital converter, M is the resolution of the first analog-to-digital converter, V adc is the sampled voltage value of the first analog-to-digital converter; V1 is the voltage value of the first reference voltage, R case is the resistance value of the second thermistor, and R1 is the resistance value of the first resistor.

5. The laser parameter control method of a laser in coherent laser communication according to claim 1, characterized in that: The first thermistor is connected in series with the second resistor; the third resistor is connected in series with the fourth resistor, and is connected in parallel with the first thermistor and the second resistor connected in series; The P terminal of the second analog-to-digital converter is connected between the third resistor and the fourth resistor, and the N terminal is connected between the first thermistor and the second resistor. The second analog-to-digital converter is a differential analog-to-digital converter; the resistance values ​​of the second resistor, the third resistor and the fourth resistor are equal; The resistance of the first thermistor is measured by: Wherein, SX is the sampling result of the second analog-to-digital converter, which is a signed number, N is the resolution of the second analog-to-digital converter, V ref is the reference voltage of the second analog-to-digital converter, and V is the sampling voltage of the second analog-to-digital converter; R NTC is the resistance value of the first thermistor; R N is the resistance value of the second resistor, the third resistor or the fourth resistor.

6. The laser parameter control method of a laser in coherent laser communication according to claim 1, characterized in that: The laser parameters include laser frequency and / or laser wavelength.

7. The laser parameter control method of a laser in coherent laser communication according to claim 1, characterized in that: The second thermistor is a MF501 thermistor; The first thermistor is a negative temperature coefficient thermistor.

8. The laser parameter control method of a laser in coherent laser communication according to claim 1, characterized in that: The temperature simulation device is a high and low temperature box.

9. A laser parameter control device for a laser in coherent laser communication, characterized in that: The laser comprises a light emitting diode, a first thermistor and a thermoelectric cooler, and a second thermistor is arranged on the surface of the shell of the laser, and the control device comprises: a temperature acquisition module, used to acquire a first temperature of the light-emitting diode acquired by the first thermistor and a second temperature of the housing surface acquired by the second thermistor; a temperature determination module, configured to determine a target temperature of the light emitting diode based on the second temperature; A temperature comparison module, used to determine the magnitude relationship between the first temperature and the target temperature; A parameter control module is used to control the thermoelectric cooler based on the size relationship to adjust the temperature of the light emitting diode to the target temperature so as to stabilize the laser parameters.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the laser parameter control method of the laser in coherent laser communication as described in any one of claims 1 to 8 is implemented.

Images