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CN-116436524-B - Laser transmission circuit and laser transmission equipment

CN116436524BCN 116436524 BCN116436524 BCN 116436524BCN-116436524-B

Abstract

The invention relates to the technical field of signal transmission and discloses a laser transmission circuit and laser transmission equipment. 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 main control unit, wherein the input end of the analog signal laser transmission unit is electrically connected with the signal input end, the output end of the analog signal laser transmission unit is electrically connected with the signal output end, the first input end of the main control unit is electrically connected with the signal input end, the second input end of the main control unit is electrically connected with the signal output end, and the analog signal output end of the main control unit is electrically connected with a low-frequency signal adjusting end of the analog signal laser transmission unit. Therefore, the invention can ensure the signal to be normal on the basis of solving the problem of signal zero drift caused by the temperature drift of the laser device, thereby improving the accuracy of judging the signal.

Inventors

  • ZHANG XINGJIE
  • WANG GUANQUN

Assignees

  • 深圳麦科信科技有限公司

Dates

Publication Date
20260508
Application Date
20230411

Claims (12)

  1. 1. The laser transmission circuit is characterized by being connected between a signal input end and a signal output end, and comprises an analog signal laser transmission unit and a main control unit; The input end of the analog signal laser transmission unit is electrically connected with the signal input end, the output end of the analog signal laser transmission unit is electrically connected with the signal output end, and the analog signal laser transmission unit is used for converting an analog input end electric signal of the signal input end into an optical signal, restoring the optical signal into an analog output end electric signal after optical path transmission, and outputting the analog output end electric signal from the signal output end; The first input end of the main control unit is electrically connected with the signal input end, the second input end of the main control unit is electrically connected with the signal output end, the analog signal output end of the main control unit is electrically connected with the low-frequency signal adjustment end of the analog signal laser transmission unit, and the main control unit is used for comparing the signal of the first input end of the main control unit with the signal of the second input end after processing and outputting an analog signal to the analog signal output end of the main control unit according to the comparison result; the analog signal laser transmission unit comprises an analog signal driving module, a laser emission module, an optical transmission module, a laser receiving module and an amplifying module; The input end of the analog signal driving module is the input end of the analog signal laser transmission unit, and the output end of the analog signal driving module is electrically connected with the first end of the laser emission module; The laser transmitting module is optically connected with the input end of the optical transmission module, and the output end of the optical transmission module is optically connected with the laser receiving module; The first end of the laser receiving module is electrically connected with a first preset reference voltage, and the second end of the laser receiving module is electrically connected with the input end of the amplifying module; The output end of the amplifying module is the output end of the analog signal laser transmission unit; The second end of the laser emitting module is the low-frequency signal adjusting end, and the second end of the laser receiving module is electrically connected with a second preset reference voltage, or The second end of the laser transmitting module is electrically connected with a third preset reference voltage, and the second end of the laser receiving module is the low-frequency signal adjusting end; the main control unit comprises a first control module, a second control module and a comparison module; the first control module and the second control module are connected through digital signal communication; the input end of the first control module is the second input end of the main control unit, the output end of the second control module is connected with the first input end of the comparison module, the second input end of the comparison module is the first input end of the main control unit, wherein the first control module collects the electric signals of the analog output end and converts the electric signals of the analog output end into electric signals of the digital output end, the electric signals of the digital output end are transmitted to the second control module, and the second control module converts the received electric signals of the digital output end into electric signals of the analog output end and transmits the electric signals of the analog output end to the comparison module, or The input end of the first control module is a first input end of the main control unit, the output end of the second control module is connected with the first input end of the comparison module, the second input end of the comparison module is a second input end of the main control unit, wherein the first control module collects the electric signals of the analog input end, converts the electric signals of the analog input end into electric signals of a digital input end, transmits the electric signals of the digital input end to the second control module, and converts the received electric signals of the digital input end into electric signals of the analog input end and transmits the electric signals of the analog input end to the comparison module; The output end of the comparison module is an analog signal output end of the main control unit, and the comparison module is used for comparing the electric signal of the first input end of the comparison module with the electric signal of the second input end of the comparison module and outputting an analog signal to a low-frequency signal adjusting end of the analog signal laser transmission unit according to the comparison result.
  2. 2. The laser transmission circuit of claim 1, wherein the first control module comprises a first analog-to-digital converter, a first host controller, and a first digital transmitter, and the second control module comprises a first digital receiver, a second host controller, and a first digital-to-analog converter; The input end of the first analog-to-digital converter is the input end of the first control module, the first analog-to-digital converter is connected with the first main controller, the first main controller is connected with the first digital transmitter, the output end of the first digital transmitter is the output end of the first main controller, wherein the first analog-to-digital converter converts an acquired analog signal into a digital signal and sends the digital signal to the first main controller, and the first main controller sends the digital signal to the first digital transmitter; The input end of the first digital receiver is the input end of the second control module, the first digital receiver is connected with the second main controller, the second main controller is connected with the first digital-to-analog converter, the output end of the first digital-to-analog converter is the output end of the second control module, wherein 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 the analog signal to the comparison module.
  3. 3. The laser transmission circuit of claim 1, wherein the comparison module is a differential operational amplifier.
  4. 4. The laser transmission circuit of claim 1, wherein the master control unit comprises a third control module and a fourth control module; The third control module and the fourth control module are connected through digital signal communication; The input end of the third control module is the second input end of the main control unit, wherein the third control module collects the analog output end electric signal and converts the analog output end electric signal into a digital output end electric signal, the fourth control module collects the analog input end electric signal and converts the analog input end electric signal into a digital input end electric signal, the output end of the fourth control module is the analog signal output end of the main control unit, the third control module transmits the digital output end electric signal to the fourth control module, the fourth control module compares the digital input end electric signal with the digital output end electric signal and outputs an analog signal to the low-frequency signal adjusting end according to the comparison result, or The input end of the third control module is the first input end of the main control unit, the input end of the fourth control module is the second input end of the main control unit, wherein the third control module collects the electric signals of the analog input end and converts the electric signals of the analog input end into electric signals of the digital input end, the fourth control module collects the electric signals of the analog output end and converts the electric signals of the analog output end into electric signals of the digital output end, the output end of the fourth control module is the analog signal output end of the main control unit, the third control module transmits the electric signals of the digital input end to the fourth control module, the fourth control module compares the electric signals of the digital input end with the electric signals of the digital output end, and outputs analog signals to the low-frequency signal adjusting end according to comparison results.
  5. 5. The laser transmission circuit of claim 4, wherein the third control module comprises a second analog-to-digital converter, a third host controller, a second digital transmitter, and the fourth control module comprises a second digital receiver, a fourth host controller, a second digital-to-analog converter, and a third analog-to-digital converter; The second analog-to-digital converter is connected with the third main controller, the third main controller is connected with the second digital transmitter, the second digital transmitter is connected with the second digital receiver, the second digital receiver is connected with the fourth main controller, the third analog-to-digital converter is connected with the fourth main controller, and the fourth main controller is connected with the second digital-to-analog converter; The second analog-to-digital converter converts the collected analog input end electric signal into a digital input end electric signal and transmits the digital input end electric signal to the fourth main controller sequentially through the third main controller, the second digital transmitter and the second digital receiver, and the third analog-to-digital converter converts the collected analog output end electric signal into a digital output end electric signal and transmits the digital output end electric 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 to the fourth main controller sequentially through the third main controller, the second digital transmitter and the second digital receiver, and 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 end electric signal with the digital output end electric signal and outputs a digital adjusting signal, and sends the digital adjusting signal to the second digital-to-analog converter, and the second digital-to-analog converter converts the digital adjusting signal into an analog adjusting signal and sends the analog adjusting signal to the low-frequency signal adjusting end of the analog signal laser transmission unit.
  6. 6. The laser transmission circuit of claim 1, further comprising 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 configured to form the analog input terminal electrical signal from a signal of the signal input terminal through the first low-pass filter module; The second low-pass filtering module is connected with the signal output end and is used for forming the analog output end electric signal by the signal of the signal output end through the second low-pass filtering module.
  7. 7. The laser transmission circuit of claim 1, wherein the analog signal driving module comprises a first operational amplifier, a first resistor, and a second resistor; the first input end of the first operational amplifier is the input end of the analog signal driving module, the first end of the first resistor is connected with the output end of the first operational amplifier, and the second end of the first resistor is the output end of the analog signal driving module; The second resistor is connected between the second input end and the output end of the first operational amplifier, or The second resistor is connected between the second input end of the first operational amplifier and the output end of the analog signal driving module.
  8. 8. The laser transmission circuit of claim 1, wherein the laser emitting module comprises a laser emitting tube and the laser receiving module comprises a laser receiving tube; The anode of the laser emission tube is connected with the analog signal driving module, the anode of the laser receiving tube is connected with the amplifying module, and the cathode of the laser receiving tube is connected with a first preset reference voltage; The cathode of the laser emitting tube is the low-frequency signal adjusting end, the anode of the laser receiving tube is connected with the second preset reference voltage, or The cathode of the laser emitting tube is connected with a third preset reference voltage, and the anode of the laser receiving tube is the low-frequency signal adjusting end; Or alternatively The cathode of the laser emission tube is connected with the analog signal driving module, the cathode of the laser receiving tube is connected with the amplifying module, and the anode of the laser receiving tube is connected with a first preset reference voltage; The anode of the laser emitting tube is the low-frequency signal adjusting end, the cathode of the laser receiving tube is connected with a second preset reference voltage, or The anode of the laser transmitting tube is connected with a third preset reference voltage, and the cathode of the laser receiving tube is the low-frequency signal adjusting end.
  9. 9. The laser transmission circuit of claim 8, wherein the amplification module comprises a second operational amplifier.
  10. 10. The laser transmission circuit as claimed in claim 9, wherein the laser receiving module further comprises a third resistor; The third resistor is connected between the anode of the laser receiving tube and a second preset reference voltage, or The third resistor is connected between the cathode of the laser receiving tube and a second preset reference voltage; The first input end of the second operational amplifier is the input end of the amplifying module, the output end of the second operational amplifier is the output end of the amplifying module, and the second input end of the second operational amplifier is connected with the output end of the second operational amplifier.
  11. 11. The laser transmission circuit as claimed in claim 9, wherein the laser receiving module further comprises a fourth resistor; The fourth resistor is connected between the anode of the laser receiving tube and the output end of the second operational amplifier, or The fourth resistor is connected between the cathode of the laser receiving tube and the output end of the second operational amplifier; the first input end of the second operational amplifier is the input end of the amplifying module, the output end of the second operational amplifier is the output end of the amplifying module, and the second input end of the second operational amplifier is connected with a second preset reference voltage.
  12. 12. A laser transmission apparatus, characterized in that the laser transmission apparatus comprises the laser transmission circuit according to any one of claims 1 to 11.

Description

Laser transmission circuit and laser transmission equipment Technical Field The present invention relates to the field of signal transmission technologies, and in particular, to a laser transmission circuit and a laser transmission device. Background At present, with the development of technology, laser signal transmission generally uses a laser diode to emit a signal, but due to the characteristics of a laser device, the laser signal is easily affected by environment or temperature, thereby generating a phenomenon of signal zero drift. In the prior art, the problem of temperature drift is solved by adopting a high-low frequency separation feedback method, the high-low frequency separation feedback method needs to combine the high frequency and the low frequency after separation, and in the high-low frequency combination process, the phenomenon of inconsistent high frequency and low frequency is easy to generate, so that signal deformity is caused, and the normal judgment of the signal is further adversely affected. Disclosure of Invention The invention mainly aims to provide a laser transmission circuit and laser transmission equipment, which aim to ensure normal signals on the basis of effectively solving the problem of zero drift of signals caused by temperature drift of laser devices, thereby improving the accuracy of judging the signals. In order to achieve the above object, the present invention provides a laser transmission circuit connected between a signal input terminal and a signal output terminal, the laser transmission circuit comprising an analog signal laser transmission unit and a main control unit; The input end of the analog signal laser transmission unit is electrically connected with the signal input end, the output end of the analog signal laser transmission unit is electrically connected with the signal output end, and the analog signal laser transmission unit is used for converting an analog input end electric signal of the signal input end into an optical signal, restoring the optical signal into an analog output end electric signal after optical path transmission, and outputting the analog output end electric signal from the signal output end; The first input end of the main control unit is electrically connected with the signal input end, the second input end of the main control unit is electrically connected with the signal output end, the analog signal output end of the main control unit is electrically connected with the low-frequency signal adjusting end of the analog signal laser transmission unit, and the main control unit is used for comparing the signal of the first input end of the main control unit with the signal of the second input end after being processed and outputting an analog signal to the analog signal output end of the main control unit according to a comparison result. Optionally, the analog signal laser transmission unit comprises an analog signal driving module, a laser emitting module, an optical transmission module, a laser receiving module and an amplifying module; The input end of the analog signal driving module is the input end of the analog signal laser transmission unit, and the output end of the analog signal driving module is electrically connected with the first end of the laser emission module; The laser transmitting module is optically connected with the input end of the optical transmission module, and the output end of the optical transmission module is optically connected with the laser receiving module; The first end of the laser receiving module is electrically connected with a first preset reference voltage, and the second end of the laser receiving module is electrically connected with the input end of the amplifying module; The output end of the amplifying module is the output end of the analog signal laser transmission unit; The second end of the laser emitting module is the low-frequency signal adjusting end, and the second end of the laser receiving module is electrically connected with a second preset reference voltage, or The second end of the laser transmitting module is electrically connected with a third preset reference voltage, and the second end of the laser receiving module is the low-frequency signal adjusting end. Optionally, the main control unit comprises a first control module, a second control module and a comparison module; the first control module and the second control module are connected through digital signal communication; The input end of the first control module is the second input end of the main control unit, the output end of the second control module is connected with the first input end of the comparison module, the second input end of the comparison module is the first input end of the main control unit, wherein the first control module collects the electric signals of the analog output end and converts the electric signals of the analog output end into electric signals of the digital output end, the digit