Analog optical transmission equipment precision control module

Abstract

The utility model relates to optical transmission equipment technical field, concretely relates to a kind of analog optical transmission equipment precision control module, including optical transmitter, circuit board is fixed in optical transmitter, signal processor, driver and laser are sequentially electrically connected and are arranged in the top surface of circuit board, signal processor includes matching circuit, preamplifier, detector, comparator and postamplifier, matching circuit, preamplifier and postamplifier are sequentially electrically connected, the output end of preamplifier is also electrically connected with the input end of detector, the output end of detector is electrically connected with the input end of comparator, comparator output two-way signal control the amplification factor of postamplifier. In the utility model, detector obtains the signal intensity after preamplifier amplification, then compares with the threshold voltage set in comparator, comparator output signal controls the amplification factor of postamplifier;The adaptability of entire module is improved.

Description

Technical Field

[0001] This utility model relates to the field of optical transmission equipment technology, and more specifically, to a precision control module for an analog optical transmission equipment. Background Technology

[0002] In fields such as optical communication and industrial control, analog optical transmission equipment needs to accurately process external analog signals and convert them into stable optical signals. The performance of its control module directly affects the transmission accuracy and reliability. Some existing analog optical transmission control modules have a fixed amplification factor, making it difficult to adapt to external analog signals of different intensities.

[0003] The utility model patent with publication number CN208723906U discloses a high-frequency analog signal photoelectric conversion device, including an optical transmitter and an optical receiver connected to the optical transmitter; the optical transmitter is used to process the input pulse signal to generate an optical signal; the optical receiver is used to process the transmitted optical signal to output a pulse signal.

[0004] Although this utility model effectively realizes an optical transmission device capable of transmitting EMP pulse signals with bandwidths from 0.1KHz to 125MHz by placing specific optical transmitters and optical receivers in a shielded enclosure, and has a perfect enclosure shielding structure, the signal amplification factor in its optical receiver is a fixed value, making it difficult to adapt to external analog signals of different intensities, and thus has obvious limitations in practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a precise control module for an analog optical transmission device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A precision control module for an analog optical transmission device includes an optical transmitter. A circuit board is fixed inside the optical transmitter. A signal processor, a driver, and a laser are electrically connected in sequence on the top surface of the circuit board. The signal processor includes a matching circuit, a preamplifier, a detector, a comparator, and a postamplifier. The matching circuit, the preamplifier, and the postamplifier are electrically connected in sequence. The output terminal of the preamplifier is also electrically connected to the input terminal of the detector. The output terminal of the detector is electrically connected to the input terminal of the comparator. The comparator outputs two signals to control the amplification factor of the postamplifier.

[0007] Preferably, the matching circuit includes resistor R1, and the preamplifier includes resistors R2, R3, and R4, and operational amplifier U1. The first terminal of resistor R1 is connected to an external analog signal, and the second terminal of resistor R1 is grounded. The first end of resistor R2 is connected to the first end of resistor R1, the second end of resistor R2 is connected to the non-inverting input of operational amplifier U1, the first end of resistor R3 is connected to the inverting input of operational amplifier U1, the second end of resistor R3 is grounded, and the first end of resistor R4 is connected to the inverting input of operational amplifier U1, and the second end of resistor R4 is connected to the output of operational amplifier U1. Preferably, the detector includes a detection chip U2, capacitors C1, C2, C3, C4, C5, resistors R5, R6, R7, and R8, and the detection chip U2 is model AD637. The BUFF IN pin of detection chip U2 is connected to the positive terminal of capacitor C1, and the negative terminal of capacitor C1 is grounded. The COMMON and OFFSET pins of detection chip U2 are grounded. The first terminal of resistor R5 is connected to a -15V power supply, and the second terminal of resistor R5 is connected to the CS pin of detection chip U2. The DET INPUT and RMS OUT pins of detection chip U2 are both connected to the first terminal of resistor R8. The second terminal of resistor R8 is connected to the second terminal of resistor R7. The first terminal of resistor R7 is connected to the positive terminal of capacitor C1. The positive terminal of capacitor C2 is connected to the RMS OUT pin of detection chip U2, and the negative terminal of capacitor C2 is connected to the C pin of detection chip U2. AV Pin, detecting the +V of chip U2 S The pin is connected to a +15V power supply to detect the -V of chip U2. S The pin is connected to a -15V power supply, the first terminal of capacitor C4 is grounded, and the second terminal of capacitor C4 is connected to the +V of the detection chip U2. S Pin 1, capacitor C5's first terminal is connected to the -V pin of detection chip U2. S The pins are connected as follows: the second terminal of capacitor C5 is grounded, and the first terminal of resistor R6 is connected to the V pin of detection chip U2. IN The pins are connected as follows: the second end of resistor R6 is connected to the output of operational amplifier U1; the positive terminal of capacitor C3 is connected to the BUFF OUT pin of detection chip U2; the negative terminal of capacitor C3 is connected to the second end of resistor R7; and the BUFF OUT pin of detection chip U2 serves as the output of the detector. Preferably, the comparator includes a comparator chip U3, a power supply VCC, resistors R9, R10, R11, and R12, and the comparator chip U3 is an LM393. The IN A+ and IN B+ pins of comparator chip U3 are both connected to the output of the detector. The V pin of comparator chip U3... CCThe pins are connected to a +5V power supply. The GND pin of comparator chip U3 is grounded. The first end of resistor R9 is connected to the power supply VCC. The second end of resistor R9 is connected to the first end of resistor R10. The second end of resistor R10 is grounded. The first end of resistor R11 is connected to the power supply VCC. The second end of resistor R11 is connected to the first end of resistor R12. The second end of resistor R12 is grounded. The IN A- pin of comparator chip U3 is connected to the second end of resistor R9. The IN B- pin of comparator chip U3 is connected to the second end of resistor R11. The voltages at the IN A- and IN B- pins of comparator chip U3 are different. The OUT A and OUT B pins of comparator chip U3 output two signals. Preferably, the post-amplifier includes a switching chip U4, resistors R14, R13, and R15, an operational amplifier U5, resistors R16 and R17, and the switching chip U4 is a CD4052. V of switch chip U4 DD The pin is connected to a +5V power supply, and the V pin of the switching chip U4 is connected to the power supply. EE The pin is connected to a -3V power supply, and the V pin of the switching chip U4 is connected to the power supply. SS The pins are grounded. The S1 and S2 pins of the switching chip U4 are connected to the OUT B and OUT A pins of the comparator chip U3, respectively. The second ends of resistors R14, R13, and R15 are all connected to the output of operational amplifier U1. The first end of resistor R14 is connected to the 1Y1 pin of the switching chip U4. The first end of resistor R13 is connected to the 1Y0 pin of the switching chip U4. The first end of resistor R15 is connected to the 1Y3 pin of the switching chip U4. The 1Z pin of the switching chip U4 is connected to the inverting input of operational amplifier U5. The first end of resistor R16 is connected to the inverting input of operational amplifier U5. The second end of resistor R16 is connected to the output of operational amplifier U5. The first end of resistor R17 is grounded. The second end of resistor R17 is connected to the non-inverting input of operational amplifier U5. The output of operational amplifier U5 is connected to the input of the driver. In these four settings, the matching circuit reduces signal reflection through impedance matching, the preamplifier achieves initial signal gain adjustment through a non-inverting amplification structure, the detector uses the detection chip U2 as its core and combines filtering components to achieve accurate conversion of AC signals to DC representation values ​​and reduce ripple interference, the comparator completes signal strength grading through a dual threshold voltage divider design and outputs a clear control signal, and the postamplifier uses the switching chip U4 to switch different resistance values ​​to achieve adaptive adjustment of multiple amplification factors, which avoids insufficient amplification of weak signals and prevents saturation distortion of strong signals, thus improving the accuracy and adaptability of signal processing as a whole.

[0008] Preferably, the signal processor receives external analog signals via a data line, and the laser transmits optical signals via an optical fiber. In this setup, the data cable provides a stable transmission channel for external analog signals, reducing interference and energy loss during transmission and ensuring the original characteristics of the signal. The optical fiber has the advantages of low attenuation and resistance to electromagnetic interference, enabling efficient transmission of the optical signal output by the laser and ensuring the stability and integrity of the signal during transmission.

[0009] Compared with the prior art, the beneficial effects of this utility model are: This invention obtains the signal strength amplified by the preamplifier by setting a detector, and then compares it with the threshold voltage set in the comparator. The comparator output signal controls the amplification factor of the post-amplifier. When the external analog signal is weak, it can switch to a high amplification level to ensure that the signal amplitude meets the modulation requirements of the laser. When the signal is strong, it automatically switches to a low amplification level to avoid signal saturation distortion, thus improving the adaptability of the entire module. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the signal processor in this utility model; Figure 3 This is a circuit diagram of the matching circuit and the preamplifier in this utility model; Figure 4 This is a circuit diagram of the detector in this utility model; Figure 5 This is the circuit schematic diagram of the comparator in this utility model; Figure 6 This is the circuit schematic diagram of the post-amplifier in this utility model; In the picture: 100. Optical transmitter; 200. Circuit board; 300. Data cable; 400. Signal processor; 401. Matching circuit; 402. Preamplifier; 403. Detector; 404. Comparator; 405. Postamplifier; 500, driver; 600. Laser; 700, optical fiber. Detailed Implementation

[0011] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0012] Please see Figures 1-6 The present invention provides the following technical solution: A precision control module for an analog optical transmission device includes an optical transmitter 100, with a circuit board 200 fixed inside the transmitter 100. A signal processor 400, a driver 500, and a laser 600 are electrically connected in sequence on the top surface of the circuit board 200. The signal processor 400 includes a matching circuit 401, a preamplifier 402, a detector 403, a comparator 404, and a postamplifier 405. The matching circuit 401, preamplifier 402, and postamplifier 405 are electrically connected in sequence. The output of the preamplifier 402 is also electrically connected to the input of the detector 403. The output of the detector 403 is electrically connected to the input of the comparator 404. The comparator 404 outputs two signals to control the amplification factor of the postamplifier 405. The detector 403 collects the signal strength of the preamplifier 402 in real time. Combined with the threshold judgment of the comparator 404 and the adaptive adjustment of the amplification factor of the postamplifier 405, this module overcomes the limitation of fixed amplification factor in existing modules and adapts to external analog signals of varying strengths.

[0013] In this embodiment, please refer to Figures 2-6 The matching circuit 401 includes resistor R1, and the preamplifier 402 includes resistors R2, R3, and R4 and operational amplifier U1. The first terminal of resistor R1 is connected to the external analog signal, and the second terminal of resistor R1 is grounded. Resistor R1 is an impedance matching resistor, used to reduce reflection loss during the transmission of external analog signals and ensure complete signal input. It is usually 50 ohms or 75 ohms. The first end of resistor R2 is connected to the first end of resistor R1, the second end of resistor R2 is connected to the non-inverting input of operational amplifier U1, the first end of resistor R3 is connected to the inverting input of operational amplifier U1, the second end of resistor R3 is grounded, the first end of resistor R4 is connected to the inverting input of operational amplifier U1, and the second end of resistor R4 is connected to the output of operational amplifier U1.

[0014] Specifically, the detector 403 includes a detection chip U2, capacitors C1, C2, C3, C4, C5, resistors R5, R6, R7, and R8, and the detection chip U2 is model AD637. The BUFF IN pin of detection chip U2 is connected to the positive terminal of capacitor C1, and the negative terminal of capacitor C1 is grounded. The COMMON and OFFSET pins of detection chip U2 are grounded. The first terminal of resistor R5 is connected to a -15V power supply, and the second terminal of resistor R5 is connected to the CS pin of detection chip U2. The DET INPUT and RMS OUT pins of detection chip U2 are both connected to the first terminal of resistor R8. The second terminal of resistor R8 is connected to the second terminal of resistor R7. The first terminal of resistor R7 is connected to the positive terminal of capacitor C1. The positive terminal of capacitor C2 is connected to the RMS OUT pin of detection chip U2, and the negative terminal of capacitor C2 is connected to the C pin of detection chip U2. AV Pin, detecting the +V of chip U2 S The pin is connected to a +15V power supply to detect the -V of chip U2. S The pin is connected to a -15V power supply, the first terminal of capacitor C4 is grounded, and the second terminal of capacitor C4 is connected to the +V of the detection chip U2. S Pin 1, capacitor C5's first terminal is connected to the -V pin of detection chip U2. S The pins are connected as follows: the second terminal of capacitor C5 is grounded, and the first terminal of resistor R6 is connected to the V pin of detection chip U2. IN The pins are connected as follows: the second terminal of resistor R6 is connected to the output terminal of operational amplifier U1; the positive terminal of capacitor C3 is connected to the BUFF OUT pin of detection chip U2; and the negative terminal of capacitor C3 is connected to the second terminal of resistor R7. The BUFF OUT pin of detection chip U2 serves as the output terminal of detector 403. Detection chip U2 acts as a root mean square to DC converter, realizing accurate conversion of AC signals to DC signals to characterize the amplitude of the input signal. It can accurately measure the root mean square value of complex waveforms such as periodic or non-periodic waveforms, meeting the high-precision requirements of signal strength detection. The second-order filter formed by resistors R7 and R8 and capacitor C3 effectively reduces AC ripple error without prolonging the circuit settling time, solving the problem of prolonged settling time caused by simply increasing the average capacitance. Capacitors C4 and C5 serve as decoupling capacitors, suppressing high-frequency power supply noise and further improving conversion stability. It can capture the true amplitude of the output signal of preamplifier 402 in real time and accurately, providing a reliable threshold judgment basis for comparator 404.

[0015] Furthermore, comparator 404 includes comparator chip U3, power supply VCC, resistors R9, R10, R11 and R12, and the model of comparator chip U3 is LM393. The IN A+ and IN B+ pins of comparator chip U3 are both connected to the output of detector 403. The V pin of comparator chip U3... CCThe pins are connected to a +5V power supply. The GND pin of comparator chip U3 is grounded. The first end of resistor R9 is connected to the power supply VCC. The second end of resistor R9 is connected to the first end of resistor R10, and the second end of resistor R10 is grounded. The first end of resistor R11 is connected to the power supply VCC. The second end of resistor R11 is connected to the first end of resistor R12, and the second end of resistor R12 is grounded. The IN A- pin of comparator chip U3 is connected to the second end of resistor R9. The IN B- pin of comparator chip U3 is connected to the second end of resistor R11. The voltages at the IN A- and IN B- pins of comparator chip U3 are different, representing different comparison thresholds. The specific parameters of power supply VCC, resistors R9, R10, R11, and R12 need to be designed according to the actual situation. The OUT A and OUT B pins of comparator chip U3 output two signals.

[0016] In addition, the post-amplifier 405 includes a switching chip U4, resistors R14, R13, and R15, an operational amplifier U5, resistors R16 and R17. The switching chip U4 is a CD4052. The switching chip U4 switches the resistor connected to the operational amplifier U5 according to the two control signals of the comparator 404, thereby changing the amplification factor of the post-amplifier 405. V of switch chip U4 DD The pin is connected to a +5V power supply, and the V pin of the switching chip U4 is connected to the power supply. EE The pin is connected to a -3V power supply, and the V pin of the switching chip U4 is connected to the power supply. SS The pins are grounded. The S1 and S2 pins of the switch chip U4 are connected to the OUT B and OUT A pins of the comparator chip U3, respectively. The second ends of resistors R14, R13, and R15 are all connected to the output of operational amplifier U1. The first end of resistor R14 is connected to the 1Y1 pin of switch chip U4. The first end of resistor R13 is connected to the 1Y0 pin of switch chip U4. The first end of resistor R15 is connected to the 1Y3 pin of switch chip U4. The 1Z pin of switch chip U4 is connected to the inverting input of operational amplifier U5. The first end of resistor R16 is connected to the inverting input of operational amplifier U5. The second end of resistor R16 is connected to the output of operational amplifier U5. The first end of resistor R17 is grounded. The second end of resistor R17 is connected to the non-inverting input of operational amplifier U5. The output of operational amplifier U5 is connected to the input of driver 500.

[0017] In this embodiment, please refer to Figure 1 The signal processor 400 receives external analog signals through the data line 300, and the laser 600 transmits optical signals through the optical fiber 700. The data line 300 provides a stable transmission path for the external analog signals, reducing interference and loss during signal transmission. The optical fiber 700, as the optical signal transmission medium, has the characteristics of low loss and anti-interference, and can efficiently transmit the stable optical signals output by the laser 600.

[0018] When the precision control module of the analog optical transmission device of this utility model is in use, external analog signals such as industrial control signals, communication analog signals, video analog signals, and audio analog signals are transmitted to the matching circuit 401 of the signal processor 400 through the data line 300. The resistor R1 in the matching circuit 401 is commonly 50 ohms or 75 ohms as an impedance matching element, which can reduce the reflection loss of the signal during transmission, avoid signal waveform distortion, and ensure that the external analog signal is completely and stably input to the preamplifier 402. The preamplifier 402, together with the operational amplifier U1 and external resistors R2, R3, and R4, forms a non-inverting amplifier circuit to initially amplify the signal input to the matching circuit 401. The ratio of resistor R4 to resistor R3 determines the initial amplification factor, which can boost weak external signals to a level that subsequent circuits can process. The amplified signal is output in two paths: one path is directly transmitted to the post-amplifier 405 to prepare for subsequent secondary amplification; the other path is input to the detector 403 through resistor R6 for signal strength detection. The detector 403 uses the detection chip U2 as its core. After receiving the AC signal output by the preamplifier 402, it filters the signal through capacitor C1 and reduces noise through a second-order filter consisting of resistors R7 and R8, converting the AC signal into a DC signal that represents the actual strength of the signal. The DC signal is output to comparator 404 through the BUFF OUT pin of the detection chip U2. The comparator chip U3 of comparator 404 compares the DC signal input from detector 403 with the IN A- pin and IN B- pin respectively: if the signal strength is lower than the low threshold, both the OUT A pin and OUT B pin output a low level; if the signal strength is between the two thresholds (assuming that the voltage at the IN A- pin is greater than the voltage at the IN B- pin), the OUT A pin outputs a low level and the OUT B pin outputs a high level; if the signal strength is higher than the high threshold, both the OUT A pin and OUT B pin output a high level. The switching chip U4 of the post-amplifier 405 receives two control signals from the comparator 404 through pins S1 and S2, adaptively switching the resistor connected to the operational amplifier U5: If the signal strength is below the low threshold, both OUT A and OUT B output a low level, and both S1 and S2 are low. Pins 1Y0 and 1Z in the switching chip U4 are connected, and resistor R13 is connected to the amplifier circuit formed by the subsequent operational amplifier U5. If the signal strength is between the two thresholds, pin OUT A outputs a low level, pin OUT B outputs a high level, pin S1 is high, and pin S2 is low. Pins 1Y1 and 1Z in the switching chip U4 are connected, and resistor R14 is connected to the amplifier circuit formed by the subsequent operational amplifier U5. If the signal strength is above the high threshold, pins OUT A and OUT B output a low level, pin S1 is high, and pin S2 is low. Pins 1Y1 and 1Z in the switching chip U4 are connected, and resistor R14 is connected to the amplifier circuit formed by the subsequent operational amplifier U5. If the signal strength is above the high threshold, pins OUT A and OUT B output a low level, pin S1 is high, and pin S2 is low. Pins 1Y1 and 1Z in the switching chip U4 are connected, and resistor R14 is connected to the amplifier circuit formed by the subsequent operational amplifier U5. Pin B outputs a high level, pins S1 and S2 are both high, pins 1Y3 and 1Z in switch chip U4 are connected, and resistor R15 is connected to the amplifier circuit formed by subsequent operational amplifier U5; among them, resistors R13, R14 and R15 have different resistance values, which allows the post-amplifier 405 to select different amplification factors. The amplified signal input driver 500 enhances the signal driving capability. It typically consists of a push-pull power amplifier circuit composed of transistors or field-effect transistors, which amplifies the low-power signal (typically only a few milliamps of current) output by the post-amplifier 405 to a driving current of tens of milliamps. At the same time, it suppresses high-frequency noise in the signal through an internal filter circuit. As the core component of electro-optical conversion, laser 600 contains a laser diode, a temperature control unit, and an optical coupling assembly. When it receives the drive signal from driver 500, the drive current flows into the laser diode. If the current reaches the threshold current, stimulated emission will occur inside the laser diode, generating laser light of a specific wavelength. The output power of the laser is linearly related to the drive current. The stable output of driver 500 can ensure that the laser power is uniform and without fluctuations. The optical coupling assembly accurately focuses the generated laser light into the fiber core of fiber 700, reducing laser loss during the coupling process.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A precision control module for an analog optical transmission device, comprising an optical transmitter (100), characterized in that: The optical transmitter (100) has a circuit board (200) fixed inside. The top surface of the circuit board (200) is provided with a signal processor (400), a driver (500) and a laser (600) that are electrically connected in sequence. The signal processor (400) includes a matching circuit (401), a preamplifier (402), a detector (403), a comparator (404) and a postamplifier (405). The matching circuit (401), the preamplifier (402) and the postamplifier (405) are electrically connected in sequence. The output terminal of the preamplifier (402) is also electrically connected to the input terminal of the detector (403). The output terminal of the detector (403) is electrically connected to the input terminal of the comparator (404). The comparator (404) outputs two signals to control the amplification factor of the postamplifier (405).

2. The precision control module for analog optical transmission equipment according to claim 1, characterized in that: The matching circuit (401) includes resistor R1, and the preamplifier (402) includes resistors R2, R3, and R4 and operational amplifier U1; The first terminal of resistor R1 is connected to an external analog signal, and the second terminal of resistor R1 is grounded. The first end of resistor R2 is connected to the first end of resistor R1, the second end of resistor R2 is connected to the non-inverting input of operational amplifier U1, the first end of resistor R3 is connected to the inverting input of operational amplifier U1, the second end of resistor R3 is grounded, the first end of resistor R4 is connected to the inverting input of operational amplifier U1, and the second end of resistor R4 is connected to the output of operational amplifier U1.

3. The precision control module for analog optical transmission equipment according to claim 1, characterized in that: The detector (403) includes a detection chip U2, capacitors C1, C2, C3, C4, C5, resistors R5, R6, R7, and R8. The detection chip U2 is model AD637. The BUFF IN pin of detection chip U2 is connected to the positive terminal of capacitor C1, and the negative terminal of capacitor C1 is grounded. The COMMON and OFFSET pins of detection chip U2 are grounded. The first terminal of resistor R5 is connected to a -15V power supply, and the second terminal of resistor R5 is connected to the CS pin of detection chip U2. The DET INPUT and RMS OUT pins of detection chip U2 are both connected to the first terminal of resistor R8. The second terminal of resistor R8 is connected to the second terminal of resistor R7. The first terminal of resistor R7 is connected to the positive terminal of capacitor C1. The positive terminal of capacitor C2 is connected to the RMS OUT pin of detection chip U2, and the negative terminal of capacitor C2 is connected to the C pin of detection chip U2. AV Pin, detecting the +V of chip U2 S The pin is connected to a +15V power supply to detect the -V of chip U2. S The pin is connected to a -15V power supply, the first terminal of capacitor C4 is grounded, and the second terminal of capacitor C4 is connected to the +V of the detection chip U2. S Pin 1, capacitor C5's first terminal is connected to the -V pin of detection chip U2. S The pins are connected as follows: the second terminal of capacitor C5 is grounded, and the first terminal of resistor R6 is connected to the V pin of detection chip U2. IN The pins are connected as follows: the second end of resistor R6 is connected to the output of operational amplifier U1; the positive terminal of capacitor C3 is connected to the BUFF OUT pin of detection chip U2; the negative terminal of capacitor C3 is connected to the second end of resistor R7; and the BUFF OUT pin of detection chip U2 serves as the output of the detector (403).

4. The precision control module for analog optical transmission equipment according to claim 3, characterized in that: The comparator (404) includes a comparator chip U3, a power supply VCC, resistors R9, R10, R11 and R12, and the model of the comparator chip U3 is LM393. The IN A+ and IN B+ pins of comparator chip U3 are both connected to the output of the detector (403), and the V of comparator chip U3... CC The pins are connected to a +5V power supply. The GND pin of comparator chip U3 is grounded. The first end of resistor R9 is connected to the power supply VCC. The second end of resistor R9 is connected to the first end of resistor R10, and the second end of resistor R10 is grounded. The first end of resistor R11 is connected to the power supply VCC. The second end of resistor R11 is connected to the first end of resistor R12, and the second end of resistor R12 is grounded. The IN A- pin of comparator chip U3 is connected to the second end of resistor R9. The INB- pin of comparator chip U3 is connected to the second end of resistor R11. The voltages at the IN A- and IN B- pins of comparator chip U3 are different. The OUT A and OUT B pins of comparator chip U3 output two signals.

5. The precision control module for analog optical transmission equipment according to claim 4, characterized in that: The post-amplifier (405) includes a switching chip U4, resistors R14, R13, and R15, an operational amplifier U5, resistors R16 and R17, and the switching chip U4 is a CD4052. V of switch chip U4 DD The pin is connected to a +5V power supply, and the V pin of the switching chip U4 is connected to the power supply. EE The pin is connected to a -3V power supply, and the V pin of the switching chip U4 is connected to the power supply. SS The pins are grounded. The S1 and S2 pins of the switch chip U4 are connected to the OUT B and OUT A pins of the comparator chip U3, respectively. The second ends of resistors R14, R13, and R15 are all connected to the output of operational amplifier U1. The first end of resistor R14 is connected to the 1Y1 pin of switch chip U4. The first end of resistor R13 is connected to the 1Y0 pin of switch chip U4. The first end of resistor R15 is connected to the 1Y3 pin of switch chip U4. The 1Z pin of switch chip U4 is connected to the inverting input of operational amplifier U5. The first end of resistor R16 is connected to the inverting input of operational amplifier U5. The second end of resistor R16 is connected to the output of operational amplifier U5. The first end of resistor R17 is grounded. The second end of resistor R17 is connected to the non-inverting input of operational amplifier U5. The output of operational amplifier U5 is connected to the input of the driver (500).

6. The precision control module for analog optical transmission equipment according to claim 1, characterized in that: The signal processor (400) receives external analog signals via a data line (300), and the laser (600) transmits optical signals via an optical fiber (700).

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