Laser transmission circuit and laser transmission device

Abstract

The application relates to the technical field of signal transmission and discloses a laser transmission circuit and a laser transmission device. The laser transmission circuit is connected between a signal input end and a signal output end, and comprises an analog signal laser transmission unit and a master control unit. The input end of the analog signal laser transmission unit is electrically connected with the signal input end, and the output end of the analog signal laser transmission unit is electrically connected with the signal output end. The first input end of the master control unit is electrically connected with the signal input end, the second input end of the master control unit is electrically connected with the signal output end, and the analog signal output end of the master control unit is electrically connected with the low-frequency signal adjusting end of the analog signal laser transmission unit. Therefore, the application can solve the problem of signal zero point drift caused by temperature drift of a laser device, ensure normal signal transmission, and improve the accuracy of signal judgment.

Description

Technical Field

[0001] This invention relates to the field of signal transmission technology, and in particular to a laser transmission circuit and a laser transmission device. Background Technology

[0002] Currently, with the development of technology, laser signal transmission usually uses laser diodes to transmit signals. However, due to the characteristics of laser devices, they are easily affected by the environment or temperature, resulting in signal zero-point drift.

[0003] In existing technologies, the high-low frequency separation feedback method is used to solve the temperature drift problem. This method requires separating and then combining the high and low frequencies. However, during the high-low frequency merging process, inconsistencies between the high and low frequencies can easily occur, leading to signal distortion and adversely affecting the normal interpretation of the signal. Summary of the Invention

[0004] The main objective of this invention is to provide a laser transmission circuit and a laser transmission device, which aims to effectively solve the problem of signal zero-point drift caused by temperature drift of laser devices, ensure normal signal operation, and thus improve the accuracy of signal judgment.

[0005] To achieve the above objectives, the present invention provides a laser transmission circuit, which is connected between a signal input terminal and a signal output terminal. The laser transmission circuit includes: an analog signal laser transmission unit and a main control unit.

[0006] The input terminal of the analog signal laser transmission unit is electrically connected to the signal input terminal, and the output terminal of the analog signal laser transmission unit is electrically connected to the signal output terminal. The analog signal laser transmission unit is used to convert the analog input terminal electrical signal of the signal input terminal into an optical signal, transmit it through an optical path, and then restore the optical signal to the analog output terminal electrical signal, and output the analog output terminal electrical signal from the signal output terminal.

[0007] The first input terminal of the main control unit is electrically connected to the signal input terminal, the second input terminal of the main control unit is electrically connected to the signal output terminal, and the analog signal output terminal of the main control unit is electrically connected to the low-frequency signal adjustment terminal of the analog signal laser transmission unit. The main control unit is used to process and compare the first input terminal signal and the second input terminal signal of the main control unit, and output an analog signal to the analog signal output terminal of the main control unit according to the comparison result.

[0008] Optionally, the analog signal laser transmission unit includes: an analog signal driving module, a laser emitting module, an optical transmission module, a laser receiving module, and an amplification module;

[0009] The input terminal of the analog signal driving module is the input terminal of the analog signal laser transmission unit, and the output terminal of the analog signal driving module is electrically connected to the first terminal of the laser emitting module.

[0010] The laser emitting module is optically connected to the input end of the optical transmission module, and the output end of the optical transmission module is optically connected to the laser receiving module.

[0011] The first end of the laser receiving module is electrically connected to a first preset reference voltage, and the second end of the laser receiving module is electrically connected to the input end of the amplification module.

[0012] The output terminal of the amplification module is the output terminal of the analog signal laser transmission unit;

[0013] The second terminal of the laser emitting module is the low-frequency signal adjustment terminal, and the second terminal of the laser receiving module is electrically connected to a second preset reference voltage; or...

[0014] The second terminal of the laser emitting module is electrically connected to a third preset reference voltage, and the second terminal of the laser receiving module is the low-frequency signal adjustment terminal.

[0015] Optionally, the main control unit includes: a first control module, a second control module, and a comparison module;

[0016] The first control module and the second control module are connected via digital signal communication.

[0017] The input terminal of the first control module is the second input terminal of the main control unit, and the output terminal of the second control module is connected to the first input terminal of the comparison module. The second input terminal of the comparison module is the first input terminal of the main control unit. The first control module acquires the analog output terminal electrical signal, converts it into a digital output terminal electrical signal, and transmits the digital output terminal signal to the second control module. The second control module converts the received digital output terminal electrical signal back into an analog output terminal electrical signal and sends it to the comparison module. Alternatively...

[0018] The input terminal of the first control module is the first input terminal of the main control unit, the output terminal of the second main control module is connected to the first input terminal of the comparison module, and the second input terminal of the comparison module is the second input terminal of the main control unit. The first control module acquires the analog input terminal electrical signal, converts the analog input terminal electrical signal into a digital input terminal electrical signal, and transmits the digital input terminal electrical signal to the second control module. The second control module converts the received digital input terminal electrical signal into an analog input terminal electrical signal and sends it to the comparison module.

[0019] The output terminal of the comparison module is the analog signal output terminal of the main control unit. The comparison module is used to compare the electrical signal at the first input terminal of the comparison module and the electrical signal at the second input terminal of the comparison module, and output an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit according to the comparison result.

[0020] Optionally, the first control module includes: a first analog-to-digital converter, a first main controller, and a first digital transmitter; the second control module includes: a first digital receiver, a second main controller, and a first digital-to-analog converter.

[0021] The input terminal of the first analog-to-digital converter is the input terminal of the first control module. The first analog-to-digital converter is connected to the first main controller. The first main controller is connected to the first digital transmitter. The output terminal of the first digital transmitter is the output terminal of the first main control module. The first analog-to-digital converter converts the acquired analog signal into a digital signal and sends the digital signal to the first main controller. The first main controller sends the digital signal to the first digital transmitter.

[0022] The input terminal of the first digital receiver is the input terminal of the second control module. The first digital receiver is connected to the second main controller, the second main controller is connected to the first digital-to-analog converter, and the output terminal of the first digital-to-analog converter is the output terminal of the second control module. The first digital receiver sends the digital signal to the second main controller, the second main controller sends the digital signal to the first digital-to-analog converter, and the first digital-to-analog converter converts the digital signal into an analog signal and sends it to the comparison module.

[0023] Optionally, the comparison module is a differential operational amplifier.

[0024] Optionally, the main control unit includes a third control module and a fourth control module;

[0025] The third control module and the fourth control module are connected via digital signal communication.

[0026] The input terminal of the third control module is the second input terminal of the main control unit. The third control module acquires the analog output electrical signal and converts it into a digital output electrical signal. The fourth control module acquires the analog input electrical signal and converts it into a digital input electrical signal. The output terminal of the fourth control module is the analog signal output terminal of the main control unit. The third control module transmits the digital output signal to the fourth control module. The fourth control module compares the digital input signal and the digital output electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal based on the comparison result. Alternatively...

[0027] The input terminal of the third control module is the first input terminal of the main control unit, and the input terminal of the fourth control module is the second input terminal of the main control unit. The third control module acquires the analog input terminal electrical signal and converts it into a digital input terminal electrical signal. The fourth control module acquires the analog output terminal electrical signal and converts it into a digital output terminal electrical signal. The output terminal of the fourth control module is the analog signal output terminal of the main control unit. The third control module transmits the digital input terminal signal to the fourth control module. The fourth control module compares the digital input terminal signal and the digital output terminal electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal based on the comparison result.

[0028] Optionally, the third control module includes a second analog-to-digital converter, a third main controller, and a second digital transmitter, and the fourth control module includes a second digital receiver, a fourth main controller, a second digital-to-analog converter, and a third analog-to-digital converter;

[0029] The second analog-to-digital converter is connected to the third main controller, the third main controller is connected to the second digital transmitter, the second digital transmitter is connected to the second digital receiver, the second digital receiver is connected to the fourth main controller, the third analog-to-digital converter is connected to the fourth main controller, and the fourth main controller is connected to the second digital-to-analog converter.

[0030] The second analog-to-digital converter converts the acquired analog input electrical signal into a digital input electrical signal, and then transmits the digital input electrical signal sequentially through the third main controller, the second digital transmitter, and the second digital receiver to the fourth main controller. The third analog-to-digital converter converts the acquired analog output electrical signal into a digital output electrical signal and transmits the digital output electrical signal to the fourth main controller; or,

[0031] The second analog-to-digital converter converts the acquired analog output signal into a digital output signal, and sends the digital output signal sequentially through the third main controller, the second digital transmitter, and the second digital receiver to the fourth main controller. The third analog-to-digital converter converts the acquired analog input signal into a digital input signal and sends the digital input signal to the fourth main controller.

[0032] The fourth control module compares the digital input signal and the digital output signal and outputs a digital adjustment signal, and sends the digital adjustment signal to the second digital-to-analog converter. The second digital-to-analog converter converts the digital adjustment signal into an analog adjustment signal and sends it to the low-frequency signal adjustment terminal of the analog signal laser transmission unit.

[0033] Optionally, the laser transmission circuit further includes: a first low-pass filter module and a second low-pass filter module, wherein the first low-pass filter module is connected to the signal input terminal and is used to pass the signal at the signal input terminal through the first low-pass filter module to form the analog input terminal electrical signal;

[0034] The second low-pass filter module is connected to the signal output terminal and is used to pass the signal from the signal output terminal through the second low-pass filter module to form the analog output terminal electrical signal.

[0035] Optionally, the analog signal driving module includes: a first operational amplifier, a first resistor, and a second resistor;

[0036] The first input terminal of the first operational amplifier is the input terminal of the analog signal driving module, the first terminal of the first resistor is connected to the output terminal of the first operational amplifier, and the second terminal of the first resistor is the output terminal of the analog signal driving module.

[0037] The second resistor is connected between the second input terminal and the output terminal of the first operational amplifier; or,

[0038] The second resistor is connected between the second input terminal of the first operational amplifier and the output terminal of the analog signal driving module.

[0039] Optionally, the laser emitting module includes a laser emitting tube, and the laser receiving module includes a laser receiving tube;

[0040] The anode of the laser emitting tube is connected to the analog signal driving module, the anode of the laser receiving tube is connected to the amplification module, and the cathode of the laser receiving tube is connected to the first preset reference voltage.

[0041] The cathode of the laser emitting tube is connected to the analog signal output terminal of the main control unit, and the anode of the laser receiving tube is connected to a second preset reference voltage; or,

[0042] The cathode of the laser emitting tube is connected to a third preset reference voltage, and the anode of the laser receiving tube is connected to the analog signal output terminal of the main control unit.

[0043] or,

[0044] The cathode of the laser emitting tube is connected to the analog signal driving module, the cathode of the laser receiving tube is connected to the amplification module, and the anode of the laser receiving tube is connected to the first preset reference voltage.

[0045] The anode of the laser emitting tube is connected to the analog signal output terminal of the main control unit, and the cathode of the laser receiving tube is connected to a second preset reference voltage; or,

[0046] The anode of the laser emitting tube is connected to a third preset reference voltage, and the anode of the laser receiving tube is connected to the analog signal output terminal of the main control unit.

[0047] Optionally, the amplification module includes a second operational amplifier.

[0048] Optionally, the laser receiving module further includes: a third resistor;

[0049] The cathode of the laser emitting tube is connected to the third preset reference voltage, and the third resistor is connected between the anode of the laser receiving tube and the second preset reference voltage; or,

[0050] The anode of the laser emitting tube is connected to the third preset reference voltage, and the third resistor is connected between the cathode of the laser receiving tube and the second preset reference voltage.

[0051] The first input terminal of the second operational amplifier is the input terminal of the amplification module, the output terminal of the second operational amplifier is the output terminal of the amplification module, and the second input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier;

[0052] The second preset reference voltage is connected to the analog signal output terminal of the main control unit.

[0053] Optionally, the laser receiving module further includes: a fourth resistor;

[0054] The cathode of the laser emitting tube is connected to the third preset reference voltage, and the fourth resistor is connected between the anode of the laser receiving tube and the output terminal of the second operational amplifier; or,

[0055] The anode of the laser emitting tube is connected to the third preset reference voltage, and the fourth resistor is connected between the cathode of the laser receiving tube and the output terminal of the second operational amplifier.

[0056] The first input terminal of the second operational amplifier is the input terminal of the amplification module, the output terminal of the second operational amplifier is the output terminal of the amplification module, and the second input terminal of the second operational amplifier is connected to the fourth preset reference voltage.

[0057] The fourth preset reference voltage is connected to the analog signal output terminal of the main control unit.

[0058] To achieve the above objectives, the present invention provides a laser transmission device, which includes the laser transmission circuit described above.

[0059] This application proposes a laser transmission circuit connected between a signal input terminal and a signal output terminal. The laser transmission circuit includes: an analog signal laser transmission unit and a main control unit; the input terminal of the analog signal laser transmission unit is electrically connected to the signal input terminal, and the output terminal of the analog signal laser transmission unit is electrically connected to the signal output terminal. The analog signal laser transmission unit is used to convert the analog input terminal electrical signal of the signal input terminal into an optical signal, transmit it through an optical path, and then restore the optical signal to the analog output terminal electrical signal, and output the analog output terminal electrical signal from the signal output terminal; the first input terminal of the main control unit is electrically connected to the signal input terminal, the second input terminal of the main control unit is electrically connected to the signal output terminal, and the analog signal output terminal of the main control unit is electrically connected to the low-frequency signal adjustment terminal of the analog signal laser transmission unit. The main control unit is used to process and compare the first input terminal signal and the second input terminal signal of the main control module, and output an analog signal to the analog signal output terminal of the main control unit according to the comparison result.

[0060] Thus, unlike the traditional high- and low-frequency separation feedback method, this application acquires the input signal at the signal input end and the output signal at the signal output end, and sends the input signal and the output signal to the main control unit. The main control unit compares the input signal and the output signal to confirm the voltage adjustment amount, and sends it to the analog signal laser transmission unit to adjust the laser tube zero-point drift. That is, the present invention can solve the problem of signal zero-point drift caused by the temperature drift of the laser device, and can ensure that the voltage of the signal transmitting end and the signal receiving end are consistent without signal distortion, thereby greatly improving the accuracy of signal judgment. Attached Figure Description

[0061] Figure 1This is a schematic diagram of the circuit structure of an embodiment of the laser transmission circuit of the present invention;

[0062] Figure 2 This is a schematic diagram of the analog signal laser unit structure of an embodiment of the laser transmission circuit of the present invention;

[0063] Figure 3 This is a schematic diagram of the first embodiment of the main control unit of the laser transmission circuit of the present invention;

[0064] Figure 4 This is a schematic diagram showing the connection between the first main controller and the second main controller in one embodiment of the laser transmission circuit of the present invention;

[0065] Figure 5 This is a schematic diagram of the second embodiment of the main control unit of the laser transmission circuit of the present invention;

[0066] Figure 6 This is a schematic diagram showing the connection between the third control module and the fourth control module in one embodiment of the laser transmission circuit of the present invention;

[0067] Figure 7 This is a schematic diagram of the structure of the first low-pass filter and the second low-pass filter in an embodiment of the laser transmission circuit of the present invention.

[0068] Figure 8 This is a schematic diagram of the structure of an analog signal driving module according to an embodiment of the laser transmission circuit of the present invention;

[0069] Figure 9 This is a schematic diagram of another embodiment of the analog signal laser transmission unit of the laser transmission circuit of the present invention;

[0070] Figure 10 This is a schematic diagram showing the connection between the laser receiving module and the amplification module of the laser transmission circuit of the present invention in a first embodiment.

[0071] Figure 11 This is a schematic diagram showing the connection between the laser receiving module 104 and the amplification module 105 of the laser transmission circuit of the present invention in a second embodiment.

[0072] Explanation of icon numbers:

[0073] label name label name 10 Analog signal laser transmission unit 20 Main control unit Vin signal input terminal Vout signal output terminal 101 Analog signal drive module 102 Laser emitting module 103 Optical transmission module 104 Laser receiver module 105 Amplification module 201 First control module 202 Second control module 203 Comparison module 2011 First analog-to-digital converter 2012 First main controller 2013 First digital transmitter 2021 First digital receiver 2022 Second main controller 2023 First digital-to-analog converter 203 Third control module 204 Fourth control module 2031 Second analog-to-digital converter 2032 Third main controller 2033 Second digital transmitter 2041 Second digital receiver 2042 Fourth main controller 2043 Third analog-to-digital converter 2045 Second digital-to-analog converter 30 First low-pass filter 40 Second low-pass filter A1 First operational amplifier R1 First resistor R2 Second resistor D1 laser emitter D2 Laser receiver A2 Second operational amplifier R3 Third resistor R4 Fourth resistor Ref1 First preset reference voltage Ref2 Second preset reference voltage Ref3 Third preset reference voltage Ref4 Fourth preset reference voltage

[0074] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0075] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0076] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0077] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0078] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0079] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0080] This invention provides a laser transmission circuit.

[0081] In one embodiment of the present invention, reference is made to... Figure 1 As shown, Figure 1 This is a schematic diagram of a circuit structure of an embodiment of a laser transmission circuit. The laser transmission circuit is connected between the signal input terminal Vin and the signal output terminal Vout. The laser transmission circuit includes: an analog signal laser transmission unit 10 and a main control unit 20.

[0082] The input terminal of the analog signal laser transmission unit 10 is electrically connected to the signal input terminal Vin, and the output terminal of the analog signal laser transmission unit 10 is electrically connected to the signal output terminal Vout. The analog signal laser transmission unit 10 is used to convert the analog input terminal electrical signal of the signal input terminal Vin into an optical signal, transmit it through an optical path, and then restore the optical signal to the analog output terminal electrical signal, and output the analog output terminal electrical signal from the signal output terminal Vout.

[0083] The first input terminal of the main control unit 20 is electrically connected to the signal input terminal Vin, the second input terminal of the main control unit 20 is electrically connected to the signal output terminal Vout, and the analog signal output terminal of the main control unit 20 is electrically connected to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10. The main control unit 20 is used to process and compare the first input terminal signal and the second input terminal signal of the main control unit, and output an analog signal to the analog signal output terminal of the main control unit 20 according to the comparison result.

[0084] In one embodiment of the present invention, reference is made to... Figure 1 As shown, Figure 1 This is a schematic diagram of the circuit structure of an embodiment of a laser transmission circuit. The laser transmission circuit is connected between the signal input terminal Vin and the signal output terminal Vout. The analog signal laser transmission unit 10 has three connection terminals, namely the input terminal, the output terminal and the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10. The main control module 20 has three connection terminals, namely the first input terminal, the second input terminal and the analog signal output terminal of the main control unit 20.

[0085] In this embodiment, the analog signal laser transmission unit 10 is connected between the signal input terminal Vin and the signal output terminal Vout. The analog signal laser transmission unit 10 acquires the analog input terminal electrical signal of the signal input terminal Vin, converts the analog input terminal electrical signal into an optical signal, transmits it through the optical path, restores the optical signal to the analog output terminal electrical signal, and outputs it from the signal output terminal Vout.

[0086] The main control unit 20 is connected between the signal input terminal Vin and the signal output terminal Vout. The first input terminal of the main control unit 20 acquires the analog input terminal electrical signal of the signal input terminal Vin, and the second input terminal of the main control unit 20 acquires the analog output terminal electrical signal of the signal output terminal Vout. After processing the analog input terminal electrical signal and the analog output terminal electrical signal, they are compared, and the analog signal is output to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10 according to the comparison result. This is to solve the signal zero-point drift problem caused by the temperature drift of the laser device and to ensure that the signal is normal.

[0087] Optionally, in some feasible embodiments, the analog signal laser transmission unit 10 includes: an analog signal driving module 101, a laser emitting module 102, an optical transmission module 103, a laser receiving module 104, and an amplification module 105;

[0088] The input terminal of the analog signal driving module 101 is the input terminal of the analog signal laser transmission unit 10, and the output terminal of the analog signal driving module 101 is electrically connected to the first terminal of the laser emitting module 102.

[0089] The laser emitting module 102 is optically connected to the input end of the optical transmission module 103, and the output end of the optical transmission module 103 is optically connected to the laser receiving module 104.

[0090] The first terminal of the laser receiving module 104 is electrically connected to the first preset reference voltage Ref1, and the second terminal of the laser receiving module 104 is electrically connected to the input terminal of the amplification module 105.

[0091] The output terminal of the amplification module 105 is the output terminal of the analog signal laser transmission unit 10;

[0092] The second terminal of the laser emitting module 102 is the low-frequency signal adjustment terminal, and the second terminal of the laser receiving module 104 is electrically connected to a second preset reference voltage; or...

[0093] The second terminal of the laser emitting module 102 is electrically connected to a third preset reference voltage, and the second terminal of the laser receiving module 104 is the low-frequency signal adjustment terminal.

[0094] In this embodiment, reference Figure 2 , Figure 2 The diagram shows the structure of the analog signal laser unit. The analog signal driving module 101 sends the analog input electrical signal of the signal input terminal Vin to the laser emitting module 102. The laser emitting module 102 converts the analog input electrical signal into an optical signal and sends the optical signal to the optical transmission module 103. The optical transmission module 103 sends the optical signal to the laser receiving module 104. The laser receiving module 104 converts the optical signal into an analog output electrical signal and sends it to the amplification module 105, which then sends the analog output electrical signal to the signal output terminal Vout.

[0095] For example, in this embodiment, two connection methods between the analog signal laser transmission unit 10 and the main control unit 20 are proposed. The first method is as follows: Figure 2In (A), the second terminal of the laser emitting module 102 is connected to the analog signal output terminal of the main control unit 20, and the second terminal of the laser receiving module 104 is electrically connected to the second preset reference voltage Ref2. By controlling the input signal of the laser emitting module, the problem of signal zero-point drift caused by the temperature drift of the laser device is solved. The second method is as follows: Figure 2 In (B), the second terminal of the laser emitting module 102 is electrically connected to the third preset reference voltage Ref3, and the third terminal of the laser receiving module 104 is connected to the analog signal output terminal of the main control unit 20. By controlling the output signal of the laser receiving module, the problem of signal zero-point drift caused by temperature drift of the laser device is solved.

[0096] Optionally, in some feasible embodiments, the main control unit 20 includes: a first control module 201, a second control module 202, and a comparison module 203;

[0097] The first control module 201 and the second control module 202 are connected via digital signal communication.

[0098] The input terminal of the first control module 201 is the second input terminal of the main control unit 20, and the output terminal of the second control module 202 is connected to the first input terminal of the comparison module 203. The second input terminal of the comparison module 203 is the first input terminal of the main control unit 20. The first control module 201 acquires the analog output terminal electrical signal, converts it into a digital output terminal electrical signal, and transmits the digital output terminal signal to the second control module 202. The second control module 202 converts the received digital output terminal electrical signal into an analog signal and sends it to the comparison module 203; or...

[0099] The input terminal of the first control module 201 is the first input terminal of the main control unit 20, the output terminal of the second main control module 202 is connected to the first input terminal of the comparison module 203, and the second input terminal of the comparison module 203 is the second input terminal of the main control unit 20. The first control module 201 acquires the analog input terminal electrical signal, converts the analog input terminal electrical signal into a digital input terminal electrical signal, and transmits the digital input terminal electrical signal to the second control module 202. The second control module 202 converts the received digital input terminal electrical signal into an analog signal and sends it to the comparison module 203.

[0100] The output terminal of the comparison module 203 is the analog signal output terminal of the main control unit 20. The comparison module 203 is used to compare the electrical signal at the first input terminal of the comparison module with the second input terminal of the comparison module, and output an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10 according to the comparison result.

[0101] In this embodiment, Figure 3 The first embodiment of the main control unit is shown in the structural diagram. The first control module 201 is connected to the signal input terminal Vin, the first control module 201 is connected to the second control module 202, the second control module 202 is connected to the comparison module 203, the comparison module 203 is connected to the signal output terminal Vout, and the comparison module 203 is connected to the analog signal laser transmission unit 10. Figure 3 In (A), the first control module 201 acquires the analog input electrical signal of the signal input terminal Vin and converts it into a digital input electrical signal. It then transmits the digital input electrical signal to the second control module 202. The second control module 202 converts the received digital input electrical signal into an analog input electrical signal and sends it to the comparison module 203. The comparison module 203 acquires the analog output electrical signal and compares the analog input electrical signal with the analog output electrical signal. Based on the comparison result, it outputs an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10.

[0102] like Figure 3 In (B), the first control module 201 is connected to the signal output terminal Vout, the first control module 201 is connected to the second control module 202, the second control module 202 is connected to the comparison module 203, the comparison module 203 is connected to the signal input terminal Vin, and the comparison module 203 is connected to the analog signal laser transmission unit 10. The first control module 201 acquires the analog output terminal electrical signal of the signal output terminal Vout and converts it into a digital output terminal electrical signal, and transmits the digital output terminal electrical signal to the second control module 202. The second control module 202 converts the received digital output terminal electrical signal into an analog output terminal electrical signal and sends it to the comparison module 203. The comparison module 203 acquires the analog input terminal electrical signal, compares the analog input terminal electrical signal and the analog output terminal electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10 according to the comparison result.

[0103] In this embodiment, the main control unit is connected between the signal input terminal Vin and the signal output terminal Vout. That is, the first input signal of the main control module is an analog input electrical signal, and the second input signal is an analog output signal.

[0104] It should be noted that the first control module 201 and the second control module 202 communicate digitally to prevent interference with the analog laser transmission unit. That is, in order to avoid the influence of the analog signal during transmission, the analog output signal is converted into a digital output signal and transmitted.

[0105] Optionally, in some feasible embodiments, the first control module 201 includes: a first analog-to-digital converter 2011, a first main controller 2012, and a first digital transmitter 2013, and the second control module 202 includes: a first digital receiver 2021, a second main controller 2022, and a first digital-to-analog converter 2023.

[0106] The input terminal of the first analog-to-digital converter 2011 is the input terminal of the first control module 201. The first analog-to-digital converter 2011 is connected to the first main controller 2012. The first main controller 2012 is connected to the first digital transmitter 2013. The output terminal of the first digital transmitter 2013 is the output terminal of the first main control module 201. The first analog-to-digital converter 2011 converts the acquired analog signal into a digital signal and sends the digital signal to the first main controller 2012. The first main controller 201 sends the digital signal to the first digital transmitter 2011.

[0107] The input terminal of the first digital receiver 2021 is the input terminal of the second control module 202. The first digital receiver 2021 is connected to the second main controller 2022. The second main controller 2022 is connected to the first digital-to-analog converter 2023. The output terminal of the first digital-to-analog converter 2023 is the output terminal of the second control module 202. The first digital receiver 2021 sends the digital signal to the second main controller 2022. The second main controller 2022 sends the digital signal to the first digital-to-analog converter 2023. The first digital-to-analog converter 2023 converts the digital signal into an analog signal and sends it to the comparison module 203.

[0108] In this embodiment, as Figure 4The diagram shows the connection between the first main controller and the second main controller. The first analog-to-digital converter 2011 converts the acquired analog input electrical signal into a digital input electrical signal and sends the digital input electrical signal to the first main controller 2012. The first main controller 2012 sends the digital input electrical signal to the first digital transmitter 2013. The first digital transmitter 2013 sends the digital input electrical signal to the first digital receiver 2021. The first digital receiver 2021 sends the input electrical signal to the second main controller 2022. The second main controller sends the digital input electrical signal to the first digital-to-analog converter 2023, so that the first digital-to-analog converter 2023 can restore the digital input electrical signal to an analog input electrical signal and send it to the comparison module 203.

[0109] For example, the first analog-to-digital converter 2011 converts the acquired analog output electrical signal into a digital output electrical signal and sends the digital output electrical signal to the first main controller 2012. The first main controller 2012 sends the digital output electrical signal to the first digital transmitter 2013. The first digital transmitter 2013 sends the digital output electrical signal to the first digital receiver 2021. The first digital receiver 2021 sends the output electrical signal to the second main controller 2022. The second main controller sends the digital output electrical signal to the first digital-to-analog converter 2023, so that the first digital-to-analog converter 2023 can restore the digital output electrical signal to an analog output electrical signal and send it to the comparison module 203.

[0110] Optionally, in some feasible embodiments, the comparison module 203 is a differential operational amplifier.

[0111] In this embodiment, the comparison module 203 can be a differential operational amplifier.

[0112] Optionally, in some feasible embodiments, the main control unit 20 includes a third control module 204 and a fourth control module 205;

[0113] The third control module 204 and the fourth control module 205 are connected via digital signal communication.

[0114] The input terminal of the third control module 203 is the second input terminal of the main control unit 20. The third control module 203 acquires the analog output terminal electrical signal and converts it into a digital output terminal electrical signal. The fourth control module 204 acquires the analog input terminal electrical signal and converts it into a digital input terminal electrical signal. The output terminal of the fourth control module 204 is the analog signal output terminal of the main control unit 20. The third control module 203 transmits the digital output terminal signal to the fourth control module 204. The fourth control module 204 compares the digital input terminal signal and the digital output terminal electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal based on the comparison result. Alternatively...

[0115] The input terminal of the third control module 204 is the first input terminal of the main control unit 20, and the input terminal of the fourth control module 205 is the second input terminal of the main control unit 20. The third control module 203 acquires the analog input terminal electrical signal and converts it into a digital input terminal electrical signal. The fourth control module 204 acquires the analog output terminal electrical signal and converts it into a digital output terminal electrical signal. The output terminal of the fourth control module 204 is the analog signal output terminal of the main control unit 20. The third control module 203 transmits the digital input terminal signal to the fourth control module 204. The fourth control module 204 compares the digital input terminal signal and the digital output terminal electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal based on the comparison result.

[0116] In this embodiment, the main control module may further include a third control module 204 and a fourth control module 205, providing two connection methods for the third control module 204 and the fourth control module 205. First, refer to... Figure 5 (A), Figure 5 The second embodiment of the main control unit is shown in the structural diagram. The third control module 203 acquires the analog input terminal electrical signal and converts it into a digital input terminal electrical signal. The third control module 203 transmits the digital input terminal signal to the fourth control module 204. The fourth control module 204 acquires the analog output terminal electrical signal and converts it into a digital output terminal electrical signal. The fourth control module 204 compares the digital input terminal signal and the digital output terminal electrical signal and outputs an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10 based on the comparison result.

[0117] Second, reference Figure 5(B) The third control module 203 acquires the analog output terminal electrical signal and converts the analog output terminal electrical signal into a digital output terminal electrical signal. The third control module 203 transmits the digital output terminal signal to the fourth control module 204. The fourth control module 204 acquires the analog input terminal electrical signal and converts the analog input terminal electrical signal into a digital input terminal electrical signal. The fourth control module 204 compares the digital input terminal signal and the digital output terminal electrical signal and outputs an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit 10 based on the comparison result.

[0118] Optionally, in some feasible embodiments, the third control module 203 includes a second analog-to-digital converter 2031, a third main controller 2032, and a second digital transmitter 2033, and the fourth control module 204 includes a second digital receiver 2041, a fourth main controller 2042, a second digital-to-analog converter 2043, and a third analog-to-digital converter 2044;

[0119] The second analog-to-digital converter 2031 is connected to the third main controller 2032, the third main controller 2032 is connected to the second digital transmitter 2033, the second digital transmitter 2033 is connected to the second digital receiver 2041, the second digital receiver 2041 is connected to the fourth main controller 2042, the third analog-to-digital converter 2043 is connected to the fourth main controller 2042, and the fourth main controller 2042 is connected to the second digital-to-analog converter 2044.

[0120] The second analog-to-digital converter 2031 converts the acquired analog input electrical signal into a digital input electrical signal, and transmits the digital input electrical signal sequentially through the third main controller 2032, the second digital transmitter 2033, and the second digital receiver 2041 to the fourth main controller 2042. The third analog-to-digital converter 2043 converts the acquired analog output electrical signal into a digital output electrical signal and transmits the digital output electrical signal to the fourth main controller 2042; or,

[0121] The second analog-to-digital converter 2031 converts the acquired analog output signal into a digital output signal, and sends the digital output signal sequentially through the third main controller 2032, the second digital transmitter 2033, and the second digital receiver 2041 to the fourth main controller 2042. The third analog-to-digital converter 2043 converts the acquired analog input signal into a digital input signal and sends the digital input signal to the fourth main controller 2042.

[0122] The fourth control module 2042 compares the digital input signal and the digital output signal and outputs a digital adjustment signal, and sends the digital adjustment signal to the second digital-to-analog converter 2044. The second digital-to-analog converter 2044 converts the digital adjustment signal into an analog adjustment signal and sends it to the low-frequency signal adjustment terminal of the analog signal laser transmission unit.

[0123] In this embodiment, the third control module 203 includes a second analog-to-digital converter 2031, a third main controller 2032, and a second digital transmitter 2033; the fourth control module 204 includes a second digital receiver 2041, a fourth main controller 2042, a second digital-to-analog converter 2043, and a third analog-to-digital converter 2044. Two connection methods are proposed, such as... Figure 6 The connection diagram of the third and fourth control modules shown is as follows: First, as... Figure 6 In (A), the second analog-to-digital converter 2031 acquires the analog input electrical signal and converts it into a digital input electrical signal, which is then sent to the third main controller 2032. The third main controller 2032 sends the digital input electrical signal to the second digital transmitter 2033. The second digital transmitter 2033 sends a digital signal to the second digital receiver 2041, transmitting the digital input electrical signal to the second digital receiver 2041. The second digital receiver 2041 sends the digital input electrical signal to the fourth main controller 2042. The third analog-to-digital converter 2043 acquires the analog output electrical signal and converts it into a digital output electrical signal, which is then sent to the fourth main controller 2042. The fourth main controller 2042 compares the digital input signal and the digital output electrical signal and outputs a digital adjustment signal, which is then sent to the second digital-to-analog converter 2044. The second digital-to-analog converter 2044 converts the digital adjustment signal into an analog adjustment signal and sends it to the low-frequency signal adjustment terminal of the analog signal laser transmission unit.

[0124] Second, such as Figure 6In (B), the second analog-to-digital converter 2031 acquires the analog output electrical signal and converts it into a digital output electrical signal, which is then sent to the third main controller 2032. The third main controller 2032 sends the digital output electrical signal to the second digital transmitter 2033. The second digital transmitter 2033 sends a digital signal to the second digital receiver 2041, transmitting the digital output electrical signal to the second digital receiver 2041. The second digital receiver 2041 sends the digital output electrical signal to the fourth main controller 2042. The third analog-to-digital converter 2043 acquires the analog input electrical signal and converts it into a digital input electrical signal, which is then sent to the fourth main controller 2042. The fourth main controller 2042 compares the digital input signal and the digital output electrical signal and outputs a digital adjustment signal, which is then sent to the second digital-to-analog converter 2044. The second digital-to-analog converter 2044 converts the digital adjustment signal into an analog adjustment signal and sends it to the low-frequency signal adjustment terminal of the analog signal laser transmission unit.

[0125] Optionally, in some feasible embodiments, the laser transmission circuit further includes: a first low-pass filter module 30 and a second low-pass filter module 40, wherein the first low-pass filter module 30 is connected to the signal input terminal Vin and is used to pass the signal of the signal input terminal Vin through the first low-pass filter module 30 to form the analog input terminal electrical signal;

[0126] The second low-pass filter module 40 is connected to the signal output terminal Vout, and is used to pass the signal of the signal output terminal Vout through the second low-pass filter module 40 to form the analog output terminal electrical signal.

[0127] For example, in this embodiment, Figure 7 The diagram shows the structure of the first and second low-pass filters. The first low-pass filter module 30 is connected between the signal input terminal Vin and the main control unit, and the second low-pass filter module 40 is connected between the signal output terminal Vout and the main control module. It should be noted that in this embodiment, the zero-point drift caused by temperature changes is low-frequency, therefore, a low-frequency filter is used. The first low-pass filter module 30 is used to low-pass filter the signal at the signal input terminal Vin and then send it to the main control module, and the second low-pass filter module 40 is used to low-pass filter the signal at the signal output terminal Vout and then send it to the main control module.

[0128] Optionally, in some feasible embodiments, the analog signal driving module 101 includes: a first operational amplifier A1, a first resistor R1, and a second resistor R2;

[0129] The first input terminal of the first operational amplifier A1 is the input terminal of the analog signal driving module 10, the first terminal of the first resistor R1 is connected to the output terminal of the first operational amplifier A1, and the second terminal of the first resistor R1 is the output terminal of the analog signal driving module 10.

[0130] The second resistor R2 is connected between the second input terminal and the output terminal of the first operational amplifier A1; or,

[0131] The second resistor R2 is connected between the second input terminal of the first operational amplifier A1 and the output terminal of the analog signal driving module 101.

[0132] For example, such as Figure 8 The schematic diagram of the analog signal driving module shown indicates that the first input terminal of the first operational amplifier A1 is connected to the signal input terminal Vin, and the output terminal of the first operational amplifier A1 is connected to the signal output terminal Vout through the first resistor R1. (Refer to...) Figure 8 In (A), the second resistor R2 is connected between the second input terminal and the output terminal of the first operational amplifier A1. That is, the first end of the second resistor R2 is connected to the second input terminal of the first operational amplifier A1, and the second end of the second resistor R2 is connected to the connection terminal of the first operational amplifier A1 and the first resistor R1.

[0133] Or, refer to Figure 8 In (B), the second resistor R2 is connected between the second input terminal and the output terminal of the first operational amplifier A1. That is, the first end of the second resistor R2 is connected to the second input terminal of the first operational amplifier A1, and the second end of the second resistor R2 is connected to the connection terminal of the first resistor R1 and the output terminal of the analog signal driving module 101.

[0134] Optionally, in some feasible embodiments, the laser emitting module 102 includes a laser emitting tube D1, and the laser receiving module 104 includes a laser receiving tube D2;

[0135] The anode of the laser emitting tube 102 is connected to the analog signal driving module 101, the anode of the laser receiving tube 104 is connected to the amplification module 105, and the cathode of the laser receiving tube 104 is connected to the first preset reference voltage Ref1.

[0136] The cathode of the laser emitting tube 102 is the low-frequency signal adjustment terminal, and the anode of the laser receiving tube 104 is connected to the second preset reference voltage Ref2; or,

[0137] The cathode of the laser emitting tube 102 is connected to the third preset reference voltage Ref3, and the anode of the laser receiving tube 104 is the low-frequency signal adjustment terminal;

[0138] or,

[0139] The cathode of the laser emitting tube 102 is connected to the analog signal driving module 101, the cathode of the laser receiving tube 104 is connected to the amplification module 105, and the anode of the laser receiving tube 104 is connected to the first preset reference voltage Ref1.

[0140] The anode of the laser emitting tube 102 is the low-frequency signal adjustment terminal, and the cathode of the laser receiving tube 104 is connected to the second preset reference voltage Ref2; or,

[0141] The anode of the laser emitting tube 102 is connected to the third preset reference voltage Ref3, and the anode of the laser receiving tube 104 is the low-frequency signal adjustment terminal.

[0142] In this embodiment, as Figure 9 The schematic diagram of another embodiment of the analog signal laser transmission unit shown indicates that the laser emitting module 102 includes a laser emitting tube D1, the laser receiving module 104 includes a laser receiving tube D2, the analog signal driving module 101 is connected to the laser emitting tube D1, the laser emitting tube 102 is connected to the optical transmission unit 103, the optical transmission unit 103 is connected to the laser receiving tube D2, the laser receiving tube 104 is connected to the amplification module 105, the analog signal output terminal of the main control unit is connected to the laser emitting tube D1, and the main control unit sends the adjustment signal to the laser emitting tube D1 to perform laser zero-point drift adjustment.

[0143] For example, such as Figure 9 As shown in (A), the anode of laser emitting tube D1 is connected to the analog signal driving module 101, the cathode of laser emitting tube D1 is connected to the main control unit 20, the cathode of laser receiving tube D2 is connected to the first preset reference voltage Ref1, and the anode of laser receiving tube D2 is connected to the amplification module 105, or, as... Figure 9 As shown in (B), the cathode of the laser emitting tube D1 is connected to the analog signal driving module 101, the anode of the laser emitting tube D1 is connected to the main control unit 20, the anode of the laser receiving tube D2 is connected to the first preset reference voltage Ref1, and the cathode of the laser receiving tube D2 is connected to the amplification module 105.

[0144] For example, such as Figure 9 As shown in (C), the anode of laser emitting tube D1 is connected to the analog signal driving module 101, the cathode of laser emitting tube D1 is connected to the third preset reference voltage Ref3, the cathode of laser receiving tube D2 is connected to the first preset reference voltage Ref1, and the anode of laser receiving tube D2 is connected to the amplification module 105 and the main control unit 20 respectively, or, as... Figure 9As shown in (D), the cathode of the laser emitting tube D1 is connected to the analog signal driving module 101, the anode of the laser emitting tube D1 is connected to the third preset reference voltage Ref3, the anode of the laser receiving tube D2 is connected to the first preset reference voltage Ref1, and the cathode of the laser receiving tube D2 is connected to the amplification module 105 and the main control unit 20 respectively.

[0145] Optionally, in some feasible embodiments, the amplification module 105 includes a second operational amplifier A2.

[0146] For example, such as Figure 10 As shown, the amplification module 105 includes a second operational amplifier A2. The input terminal of the second operational amplifier A2 is the input terminal of the amplification module 105, and the output terminal of the second operational amplifier A2 is the output terminal of the amplification module 105. The input terminal of the second operational amplifier A2 is connected to the laser receiving tube D2, and the output terminal of the second operational amplifier A2 is connected to the signal output terminal Vout.

[0147] Optionally, in some feasible embodiments, the laser receiving module 104 further includes: a third resistor R3;

[0148] The third resistor R3 is connected between the anode of the laser receiver tube 104 and the second preset reference voltage Ref2; or,

[0149] The third resistor R3 is connected between the cathode of the laser receiver tube 104 and the second preset reference voltage Ref2;

[0150] The first input terminal of the second operational amplifier A2 is the input terminal of the amplification module 105, the output terminal of the second operational amplifier A2 is the output terminal of the amplification module 105, and the second input terminal of the second operational amplifier A2 is connected to the output terminal of the second operational amplifier A2.

[0151] For example, such as Figure 10 The diagram shows the connection between the laser receiving module and the amplification module in the first embodiment. The laser receiving module 104 also includes a third resistor R3. The first end of the third resistor R3 is connected to the connection terminal of the laser receiving tube D2 and the second operational amplifier A2. The second end of the third resistor R3 is connected to the second preset reference voltage Ref2. When the laser emitting tube 102 is connected to the third preset reference voltage Ref3, the second preset reference voltage Ref2 is connected to the analog signal output terminal of the main control module 20.

[0152] For example, such as Figure 10As shown in (A), the first end of the third resistor R3 is connected to the anode of the laser receiver D2 and the first input terminal of the second operational amplifier A2. The second end of the third resistor R3 is connected to the second preset reference voltage Ref2. The second input and output terminals of the second operational amplifier A2 are connected. The cathode of the laser emitter D2 is connected to the first preset reference voltage Ref1. Figure 10 As shown in (B), the first end of the third resistor R3 is connected to the cathode of the laser receiver D2 and the first input terminal of the second operational amplifier A2. The second end of the third resistor R3 is connected to the second preset reference voltage. The second input terminal and the output terminal of the second operational amplifier A2 are connected. The anode of the laser emitter D2 is connected to the first preset reference voltage Ref1.

[0153] It should be noted that, Figure 10 (A) and (B) are schematic diagrams showing that when the laser emitting tube D1 is connected to the main control unit 20, the laser receiving tube D2 is connected to the second preset reference voltage Ref2. It should be understood that when the laser emitting tube D1 is connected to the third preset reference voltage Ref3, the second end of the third resistor R3 is connected to the main control unit 10.

[0154] Optionally, in some feasible embodiments, the laser receiving module 104 further includes: a fourth resistor R4; the fourth resistor R4 is connected between the anode of the laser emitting tube 102 and the output terminal of the second operational amplifier A2; or,

[0155] The fourth resistor R4 is connected between the cathode of the laser receiver tube and the output terminal of the second operational amplifier A2;

[0156] The first input terminal of the second operational amplifier A2 is the input terminal of the amplification module 105, the output terminal of the second operational amplifier A2 is the output terminal of the amplification module 105, and the second input terminal of the second operational amplifier A2 is connected to the fourth preset reference voltage Ref4.

[0157] For example, such as Figure 11 The diagram shows the connection of the laser receiving module 104 and the amplification module 105 in the second embodiment. The laser receiving module 104 also includes a fourth resistor R4. The first end of the fourth resistor R4 is connected to the connection terminal of the laser receiving tube D2 and the second operational amplifier 105. The second end of the fourth resistor R4 is connected to the output terminal of the operational amplifier A2. When the laser emitting tube 102 is connected to the third preset reference voltage Ref3, the fourth preset reference voltage Ref4 is connected to the analog signal output terminal of the main control module 20.

[0158] For example, such as Figure 11As shown in (A), the first end of the fourth resistor R4 is connected to the anode of the laser receiver D2 and the first input terminal of the second operational amplifier 105. The second end of the fourth resistor R4 is connected to the output terminal of the operational amplifier A2. The second end of the fourth resistor R4 is connected to the second input terminal of the operational amplifier A2 and the second preset reference voltage Ref2. The cathode of the laser receiver D2 is connected to the first preset reference voltage Ref1. Figure 11 As shown in (B), the first end of the fourth resistor R4 is connected to the anode of the laser receiver D2 and the first input terminal of the second operational amplifier 105. The second end of the fourth resistor R4 is connected to the output terminal of the operational amplifier A2. The second end of the fourth resistor R4 is connected to the second input terminal of the operational amplifier A2 and the second preset reference voltage Ref2. The anode of the laser receiver D2 is connected to the first preset reference voltage Ref1.

[0159] It should be noted that, as Figure 11 (A) and (B) are schematic diagrams showing the connection of laser receiver D2 to the second preset reference voltage Ref2 when laser emitter D1 is connected to the main control unit 20. It should be understood that this also includes the connection of the second input terminal of the second operational amplifier to the main control unit 20 when laser emitter D1 is connected to the third preset reference voltage Ref3.

[0160] In this embodiment, by acquiring the input signal at the signal input terminal and the output signal at the signal output terminal, the input signal and the output signal are sent to the main control unit. The main control unit compares the input signal and the output signal to confirm the voltage adjustment amount and sends it to the analog signal laser transmission unit to adjust the zero-point drift of the laser tube. That is, the present invention can solve the problem of signal zero-point drift caused by the temperature drift of the laser device, and can ensure that the voltage of the signal transmitting end and the signal receiving end are consistent without signal distortion, thereby greatly improving the accuracy of signal judgment.

[0161] Optionally, in some feasible embodiments, the laser transmission device includes the laser transmission circuit described above;

[0162] The laser transmission device is used to automatically adjust the laser zero-point drift. The specific structure of the laser transmission device is as described in the above embodiments. Since this laser transmission device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0163] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A laser transmission circuit, characterized in that, The laser transmission circuit is connected between the signal input terminal and the signal output terminal, and the laser transmission circuit includes: an analog signal laser transmission unit and a main control unit; The input terminal of the analog signal laser transmission unit is electrically connected to the signal input terminal, and the output terminal of the analog signal laser transmission unit is electrically connected to the signal output terminal. The analog signal laser transmission unit is used to convert the analog input terminal electrical signal of the signal input terminal into an optical signal, transmit it through an optical path, and then restore the optical signal to the analog output terminal electrical signal, and output the analog output terminal electrical signal from the signal output terminal. The first input terminal of the main control unit is electrically connected to the signal input terminal, the second input terminal of the main control unit is electrically connected to the signal output terminal, and the analog signal output terminal of the main control unit is electrically connected to the low-frequency signal adjustment terminal of the analog signal laser transmission unit. The main control unit is used to process and compare the first input terminal signal and the second input terminal signal of the main control unit, and output an analog signal to the analog signal output terminal of the main control unit according to the comparison result. The analog signal laser transmission unit includes: an analog signal driving module, a laser emitting module, an optical transmission module, a laser receiving module, and an amplification module; The input terminal of the analog signal driving module is the input terminal of the analog signal laser transmission unit, and the output terminal of the analog signal driving module is electrically connected to the first terminal of the laser emitting module. The laser emitting module is optically connected to the input end of the optical transmission module, and the output end of the optical transmission module is optically connected to the laser receiving module. The first end of the laser receiving module is electrically connected to a first preset reference voltage, and the second end of the laser receiving module is electrically connected to the input end of the amplification module. The output terminal of the amplification module is the output terminal of the analog signal laser transmission unit; The second terminal of the laser emitting module is the low-frequency signal adjustment terminal, and the second terminal of the laser receiving module is electrically connected to a second preset reference voltage; or... The second terminal of the laser emitting module is electrically connected to a third preset reference voltage, and the second terminal of the laser receiving module is the low-frequency signal adjustment terminal. The main control unit includes: a first control module, a second control module, and a comparison module; The first control module and the second control module are connected via digital signal communication. The input terminal of the first control module is the second input terminal of the main control unit, and the output terminal of the second control module is connected to the first input terminal of the comparison module. The second input terminal of the comparison module is the first input terminal of the main control unit. The first control module acquires the analog output terminal electrical signal, converts it into a digital output terminal electrical signal, and transmits the digital output terminal electrical signal to the second control module. The second control module converts the received digital output terminal electrical signal back into an analog output terminal electrical signal and sends it to the comparison module. Alternatively... The input terminal of the first control module is the first input terminal of the main control unit, the output terminal of the second control module is connected to the first input terminal of the comparison module, and the second input terminal of the comparison module is the second input terminal of the main control unit. The first control module acquires the analog input terminal electrical signal, converts the analog input terminal electrical signal into a digital input terminal electrical signal, and transmits the digital input terminal electrical signal to the second control module. The second control module converts the received digital input terminal electrical signal into an analog input terminal electrical signal and sends it to the comparison module. The output terminal of the comparison module is the analog signal output terminal of the main control unit. The comparison module is used to compare the electrical signal at the first input terminal of the comparison module and the electrical signal at the second input terminal of the comparison module, and output an analog signal to the low-frequency signal adjustment terminal of the analog signal laser transmission unit according to the comparison result.

2. The laser transmission circuit as described in claim 1, characterized in that, The first control module includes: a first analog-to-digital converter, a first main controller, and a first digital transmitter; the second control module includes: a first digital receiver, a second main controller, and a first digital-to-analog converter. The input terminal of the first analog-to-digital converter is the input terminal of the first control module. The first analog-to-digital converter is connected to the first main controller. The first main controller is connected to the first digital transmitter. The output terminal of the first digital transmitter is the output terminal of the first main controller. The first analog-to-digital converter converts the acquired analog signal into a digital signal and sends the digital signal to the first main controller. The first main controller sends the digital signal to the first digital transmitter. The input terminal of the first digital receiver is the input terminal of the second control module. The first digital receiver is connected to the second main controller, the second main controller is connected to the first digital-to-analog converter, and the output terminal of the first digital-to-analog converter is the output terminal of the second control module. The first digital receiver sends the digital signal to the second main controller, the second main controller sends the digital signal to the first digital-to-analog converter, and the first digital-to-analog converter converts the digital signal into an analog signal and sends it to the comparison module.

3. The laser transmission circuit as described in claim 1, characterized in that, The comparison module is a differential operational amplifier.

4. The laser transmission circuit as described in claim 1, characterized in that, The main control unit includes a third control module and a fourth control module; The third control module and the fourth control module are connected via digital signal communication. The input terminal of the third control module is the second input terminal of the main control unit. The third control module acquires the analog output electrical signal and converts it into a digital output electrical signal. The fourth control module acquires the analog input electrical signal and converts it into a digital input electrical signal. The output terminal of the fourth control module is the analog signal output terminal of the main control unit. The third control module transmits the digital output electrical signal to the fourth control module. The fourth control module compares the digital input electrical signal and the digital output electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal based on the comparison result. Alternatively... The input terminal of the third control module is the first input terminal of the main control unit, and the input terminal of the fourth control module is the second input terminal of the main control unit. The third control module acquires the analog input terminal electrical signal and converts it into a digital input terminal electrical signal. The fourth control module acquires the analog output terminal electrical signal and converts it into a digital output terminal electrical signal. The output terminal of the fourth control module is the analog signal output terminal of the main control unit. The third control module transmits the digital input terminal electrical signal to the fourth control module. The fourth control module compares the digital input terminal electrical signal and the digital output terminal electrical signal, and outputs an analog signal to the low-frequency signal adjustment terminal based on the comparison result.

5. The laser transmission circuit as described in claim 4, characterized in that, The third control module includes a second analog-to-digital converter, a third main controller, and a second digital transmitter; the fourth control module includes a second digital receiver, a fourth main controller, a second digital-to-analog converter, and a third analog-to-digital converter. The second analog-to-digital converter is connected to the third main controller, the third main controller is connected to the second digital transmitter, the second digital transmitter is connected to the second digital receiver, the second digital receiver is connected to the fourth main controller, the third analog-to-digital converter is connected to the fourth main controller, and the fourth main controller is connected to the second digital-to-analog converter. The second analog-to-digital converter converts the acquired analog input electrical signal into a digital input electrical signal, and then transmits the digital input electrical signal sequentially through the third main controller, the second digital transmitter, and the second digital receiver to the fourth main controller. The third analog-to-digital converter converts the acquired analog output electrical signal into a digital output electrical signal and transmits the digital output electrical signal to the fourth main controller; or, The second analog-to-digital converter converts the acquired analog output signal into a digital output signal, and sends the digital output signal sequentially through the third main controller, the second digital transmitter, and the second digital receiver to the fourth main controller. The third analog-to-digital converter converts the acquired analog input signal into a digital input signal and sends the digital input signal to the fourth main controller. The fourth control module compares the digital input terminal electrical signal and the digital output terminal electrical signal and outputs a digital adjustment signal, and sends the digital adjustment signal to the second digital-to-analog converter. The second digital-to-analog converter converts the digital adjustment signal into an analog adjustment signal and sends it to the low-frequency signal adjustment terminal of the analog signal laser transmission unit.

6. The laser transmission circuit as described in claim 1, characterized in that, The laser transmission circuit further includes: a first low-pass filter module and a second low-pass filter module, wherein the first low-pass filter module is connected to the signal input terminal and is used to pass the signal at the signal input terminal through the first low-pass filter module to form the analog input terminal electrical signal; The second low-pass filter module is connected to the signal output terminal and is used to pass the signal from the signal output terminal through the second low-pass filter module to form the analog output terminal electrical signal.

7. The laser transmission circuit as described in claim 1, characterized in that, The analog signal driving module includes: a first operational amplifier, a first resistor, and a second resistor; The first input terminal of the first operational amplifier is the input terminal of the analog signal driving module, the first terminal of the first resistor is connected to the output terminal of the first operational amplifier, and the second terminal of the first resistor is the output terminal of the analog signal driving module. The second resistor is connected between the second input terminal and the output terminal of the first operational amplifier; or, The second resistor is connected between the second input terminal of the first operational amplifier and the output terminal of the analog signal driving module.

8. The laser transmission circuit as described in claim 1, characterized in that, The laser emitting module includes a laser emitting tube, and the laser receiving module includes a laser receiving tube; The anode of the laser emitting tube is connected to the analog signal driving module, the anode of the laser receiving tube is connected to the amplification module, and the cathode of the laser receiving tube is connected to the first preset reference voltage. The cathode of the laser emitting tube is the low-frequency signal adjustment terminal, and the anode of the laser receiving tube is connected to the second preset reference voltage. or, The cathode of the laser emitting tube is connected to a third preset reference voltage, and the anode of the laser receiving tube is the low-frequency signal adjustment terminal; or, The cathode of the laser emitting tube is connected to the analog signal driving module, the cathode of the laser receiving tube is connected to the amplification module, and the anode of the laser receiving tube is connected to the first preset reference voltage. The anode of the laser emitting tube is the low-frequency signal adjustment terminal, and the cathode of the laser receiving tube is connected to the second preset reference voltage; or, The anode of the laser emitting tube is connected to a third preset reference voltage, and the cathode of the laser receiving tube is the low-frequency signal adjustment terminal.

9. The laser transmission circuit as described in claim 8, characterized in that, The amplification module includes a second operational amplifier.

10. The laser transmission circuit as described in claim 9, characterized in that, The laser receiving module further includes: a third resistor; The third resistor is connected between the anode of the laser receiver tube and the second preset reference voltage; or, The third resistor is connected between the cathode of the laser receiver tube and the second preset reference voltage; The first input terminal of the second operational amplifier is the input terminal of the amplification module, the output terminal of the second operational amplifier is the output terminal of the amplification module, and the second input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier.

11. The laser transmission circuit as described in claim 9, characterized in that, The laser receiving module further includes: a fourth resistor; The fourth resistor is connected between the anode of the laser receiver tube and the output terminal of the second operational amplifier; or, The fourth resistor is connected between the cathode of the laser receiver tube and the output terminal of the second operational amplifier; The first input terminal of the second operational amplifier is the input terminal of the amplification module, the output terminal of the second operational amplifier is the output terminal of the amplification module, and the second input terminal of the second operational amplifier is connected to the second preset reference voltage.

12. A laser transmission device, characterized in that, The laser transmission device includes a laser transmission circuit as described in any one of claims 1 to 11.

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