Long-distance optical dispersion compensation device

Abstract

The present invention relates to a compensation device, in particular to a long-distance optical dispersion compensation device. According to the technical solution provided by the present invention, the long-distance optical dispersion compensation device includes an optical dispersion compensation circuit, and the optical dispersion compensation circuit includes a first-level compensation circuit, a second-level compensation circuit and a third-level compensation circuit capable of performing optical dispersion compensation, wherein the first-level compensation circuit, the second-level compensation circuit and the third-level compensation circuit are connected in sequence, and the first-level compensation circuit is also connected to an input matching impedance conversion circuit, and the third-level compensation circuit is connected to an output matching impedance conversion circuit. The present invention can compensate for the dispersion noise generated by optical fiber signals over long distances, effectively ensure the required transmission distance and meet the indicators after transmission, and is easy to use and operate, reduces costs, and is safe and reliable.

Description

Technical Field

[0001] The present invention relates to a compensation device, in particular to a long-distance optical dispersion compensation device. Background Art

[0002] With the development of the communications industry, the user experience has improved, and the requirements for receiving network signals and video signals are more stable, enhanced, and efficient, thus realizing the fiber-to-the-home transmission system. The existing fiber-optic transmission system consists of front-end satellite receivers, signal modulators, preamplifiers, 1550nm optical transmitters, optical amplifiers, terminal receivers and other equipment; among them, the base station where the signal is sent is generally tens of kilometers or even hundreds of kilometers away from the user. There is noise convergence in such a long-distance transmission, which leads to the need to add conversion base stations during the transmission process to ensure the integrity and distortion of the signal. After adding conversion base stations, the difficulty of construction and maintenance will increase, and more equipment and costs will be added.

[0003] At present, there are externally modulated 1550nm optical transmitters on the market that can increase the transmission distance of optical fibers. The implementation principle is to use optical modulation to improve the dispersion compensation of light in the optical transmission process. However, the debugging process requires strong professional knowledge and engineering personnel to debug, and the operation is complicated. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a long-distance optical dispersion compensation device, which can compensate for the dispersion noise generated by optical fiber signals over long distances, effectively ensure the required transmission distance and meet the indicators after transmission, is easy to use and operate, reduces costs, and is safe and reliable.

[0005] According to the technical solution provided by the present invention, the long-distance optical dispersion compensation device includes an optical dispersion compensation circuit, and the optical dispersion compensation circuit includes a first-stage compensation circuit, a second-stage compensation circuit and a third-stage compensation circuit that can perform optical dispersion compensation, wherein the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit are connected in sequence, and the first-stage compensation circuit is also connected to the input matching impedance transformation circuit, and the third-stage compensation circuit is connected to the output matching impedance transformation circuit.

[0006] It also includes a radio frequency amplifying circuit adaptively connected to the input matching impedance transformation circuit and an amplitude modulation compensation circuit adaptively connected to the output matching impedance transformation circuit. The radio frequency amplifying circuit and the amplitude modulation compensation circuit are both connected to the control circuit, and the control circuit can also provide the compensation voltage required by the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit.

[0007] The input matching impedance transformation circuit includes an impedance transformer T2, one end of the primary coil of the impedance transformer T2 is connected to the output end of the RF amplifier circuit, the other end of the primary coil of the impedance transformer T2 is grounded, one end of the secondary coil of the impedance transformer T2 is connected to one end of the capacitor C12, and the other end of the capacitor C12 is connected to the first-stage compensation circuit.

[0008] The first-stage compensation circuit includes an inductor L5, one end of the inductor L5 is connected to one end of the capacitor C2, one end of the capacitor C12 and one end of the capacitor C17, the other end of the capacitor C17 is grounded through the inductor L8, the other end of the capacitor C2 is grounded, the other end of the inductor L5 is connected to one end of the capacitor C8, the cathode end of the varactor VR1 and one end of the capacitor C15, the other end of the capacitor C8 and the anode end of the varactor VR1 are both grounded, the other end of the capacitor C15 is connected to the cathode end of the varactor VR6 and one end of the resistor R6, the other end of the resistor R6 is connected to one end of the inductor L9, the other end of the inductor L9 receives the compensation voltage VC1 output by the control circuit, and the other end of the inductor L9 is connected to the second-stage compensation circuit.

[0009] The second-stage compensation circuit includes an inductor L2, one end of which is connected to the cathode end of the varactor VR1, the other end of which is connected to the cathode end of the varactor VR2, one end of the inductor L1, one end of the capacitor C9 and one end of the capacitor C14, the anode end of the varactor VR2 is grounded, and the other end of the inductor L1 receives the compensation voltage VC2 provided by the control circuit through the resistor R1; the other end of the capacitor C14 is connected to one end of the resistor R4 and the cathode end of the varactor VR5, the anode end of the varactor VR5 is grounded, the other end of the resistor R4 is connected to one end of the inductor L11, the other end of the inductor L11 is connected to the other end of the inductor L9 and one end of the capacitor C23, and the other end of the capacitor C23 is grounded.

[0010] The third-stage compensation circuit includes an inductor L3, one end of the inductor L3 is connected to the other end of the capacitor C9, the other end of the inductor L3 is connected to one end of the capacitor C4, one end of the capacitor C10 and one end of the resistor R3, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C18, the other end of the capacitor C18 is connected to the cathode end of the varactor diode VR7, one end of the resistor R7 is connected to the other end of the capacitor C18, the other end of the resistor R7 is connected to one end of the inductor L12, and the other end of the inductor L12 can receive the compensation provided by the control circuit. The compensation voltage VC3 is generated, and the other end of the inductor L12 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the capacitor C27 and one end of the inductor L10, the other end of the capacitor C27 is grounded, the other end of the inductor L10 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the capacitor C10, the cathode end of the varactor VR3 and one end of the inductor L4, the other end of the inductor L4 is connected to the cathode end of the varactor VR4, and the anode end of the varactor VR3 and the anode end of the varactor VR4 are both grounded.

[0011] The output matching impedance transformation circuit includes an impedance transformer T1, one end of the primary coil of the impedance transformer T1 is connected to one end of the capacitor C3 and one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 and the other end of the capacitor C3 are both grounded; the other end of the primary coil of the impedance transformer T1 is connected to one end of the inductor L6, and one end of the secondary coil of the impedance transformer T1 is connected to the amplitude modulation compensation circuit; the other end of the inductor L6 is connected to one end of the capacitor C16 and one end of the capacitor C5, the other end of the capacitor C16 is grounded, and the other end of the capacitor C5 is connected to the third-level compensation circuit.

[0012] The amplitude modulation compensation circuit includes a chip U1, wherein the chip U1 adopts a chip model DS1090, the J0 end of the chip U1 is connected to one end of the resistor R10, the J1 end of the chip U1 is connected to one end of the resistor R11, the JC0 of the chip U1 is connected to one end of the resistor R3, the JC1 end of the chip U1 is connected to one end of the resistor R15, the other end of the resistor R10 and the other end of the resistor R11 are both grounded, the other end of the resistor R13 and the other end of the resistor R15 are connected to a +3.3V voltage and are connected to one end of the capacitor C24, and the other end of the capacitor C24 is grounded;

[0013] The GND terminal of the chip U1 is grounded, the Vcc terminal of the chip U1 receives a +3.3V voltage and is connected to one end of the capacitor C22, and the other end of the capacitor C22 is grounded; the Rset terminal of the chip U1 is grounded through the resistor R14; the OUT terminal of the chip U1 is connected to one end of the resistor R16, and the other end of the resistor R16 is connected to the moving end of the potentiometer w1, and the potentiometer w1 is also connected to one end of the inductor L13 and one end of the capacitor C26, and the other end of the inductor L13 is connected to one end of the capacitor C25 and one end of the resistor R8, and the other end of the resistor R8 is connected to one end of the capacitor C19 and one end of the capacitor C20, and the other end of the capacitor C26, the other end of the capacitor C25, and the other end of the capacitor C19 are all grounded;

[0014] The other end of capacitor C20 is connected to one end of inductor L7, the other end of inductor L7 is connected to one end of capacitor C11, one end of capacitor C7 and one end of capacitor C13, one end of capacitor C7 is grounded, the other end of capacitor C11 is connected to the secondary coil of impedance transformer T1, and the other end of capacitor C13 is connected to the input port of the laser.

[0015] The control circuit includes a single chip microcomputer.

[0016] The advantages of the present invention are as follows: an optical dispersion compensation circuit can be formed by an input matching impedance circuit, a first-stage compensation circuit, a second-stage compensation circuit, a third-stage compensation circuit and an output matching impedance circuit; after compensation by the optical dispersion compensation circuit, dispersion noise generated by a long-distance optical fiber signal can be compensated, the required transmission distance can be effectively ensured and the indicators after transmission can be met, the convenience of operation is improved, and safety and reliability are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural block diagram of the use state of the present invention.

[0018] Figure 2 It is a circuit principle diagram of the optical dispersion compensation circuit of the present invention.

[0019] Figure 3 It is a circuit principle diagram of the amplitude modulation compensation circuit of the present invention.

[0020] Explanation of the reference numerals: 1 - control circuit, 2 - radio frequency amplification circuit, 3 - optical dispersion compensation circuit, and 4 - amplitude modulation compensation circuit. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0022] like Figure 1As shown: In order to effectively ensure the required transmission distance and meet the indicators after transmission and improve the convenience of operation, the present invention includes an optical dispersion compensation circuit 3, and the optical dispersion compensation circuit 3 includes a first-level compensation circuit, a second-level compensation circuit and a third-level compensation circuit that can perform optical dispersion compensation, wherein the first-level compensation circuit, the second-level compensation circuit and the third-level compensation circuit are connected in sequence, and the first-level compensation circuit is also connected to the input matching impedance transformation circuit, and the third-level compensation circuit is connected to the output matching impedance transformation circuit.

[0023] Specifically, the dispersion compensation of light in the optical transmission process can be achieved through the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit in the optical dispersion compensation circuit 3. During compensation, the input impedance matching can be achieved through the input matching impedance transformation circuit, and the output impedance matching can be achieved through the output matching impedance transformation circuit.

[0024] Furthermore, it also includes a radio frequency amplification circuit 2 adaptively connected to the input matching impedance conversion circuit and an amplitude modulation compensation circuit 4 adaptively connected to the output matching impedance conversion circuit. The radio frequency amplification circuit 2 and the amplitude modulation compensation circuit 4 are both connected to the control circuit 1, and the control circuit 1 can also provide the compensation voltage required by the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit.

[0025] In the embodiment of the present invention, the control circuit 1 can be a single chip microcomputer, etc., and can perform radio frequency amplification through the radio frequency amplifier circuit 2. The radio frequency amplifier circuit 2 can amplify and process the undistorted small signal to achieve the optimal excitation level of the laser, ensuring that the laser works in the best state. The level of a general laser is about 98 to 105dBuV. The signal processed by the optical dispersion compensation circuit 3 can be further improved by the amplitude modulation compensation circuit 4. A signal that can modulate the signal to improve the optical dispersion compensation is added to the optical fiber, that is, the added amplitude modulation compensation circuit 4 provides an adjustment range for the line width or spectrum width of the light source.

[0026] like Figure 2 As shown, the input matching impedance transformation circuit includes an impedance transformer T2, one end of the primary coil of the impedance transformer T2 is connected to the output end of the RF amplifier circuit 2, the other end of the primary coil of the impedance transformer T2 is grounded, one end of the secondary coil of the impedance transformer T2 is connected to one end of the capacitor C12, and the other end of the capacitor C12 is connected to the first-stage compensation circuit.

[0027] In the embodiment of the present invention, the radio frequency signal RF IN is a radio frequency signal amplified by the radio frequency amplifier circuit 2. The impedance transformer T2 can transform the 75 ohm into a 50 ohm radio frequency signal. After being transmitted through the capacitor C12, it can be connected to the first-stage compensation circuit. The impedance transformer T2 can achieve input impedance matching.

[0028] Further, the first-stage compensation circuit includes an inductor L5, one end of the inductor L5 is connected to one end of the capacitor C2, one end of the capacitor C12 and one end of the capacitor C17, the other end of the capacitor C17 is grounded through the inductor L8, the other end of the capacitor C2 is grounded, the other end of the inductor L5 is connected to one end of the capacitor C8, the cathode end of the varactor VR1 and one end of the capacitor C15, the other end of the capacitor C8 and the anode end of the varactor VR1 are both grounded, the other end of the capacitor C15 is connected to the cathode end of the varactor VR6 and one end of the resistor R6, the other end of the resistor R6 is connected to one end of the inductor L9, the other end of the inductor L9 receives the compensation voltage VC1 output by the control circuit 1, and the other end of the inductor L9 is connected to the second-stage compensation circuit.

[0029] In the embodiment of the present invention, capacitor C2 and capacitor C8 are radio frequency compensation capacitors, capacitor C17 and inductor L8 form an LC correction circuit to improve the flatness of the entire bandwidth, and inductor L5 is a capacitive-inductive-reactance matching on the line. Capacitor C8 is a matching capacitor. Inductor L9 is a high-frequency inductor, and compensation voltage VC1 is provided by control circuit 1. By improving the internal conductivity of varactor diode VR1 and varactor diode VR6, a delay is generated to compensate for the time delay of optical dispersion. The specific size of compensation voltage VC1 can be generated by control circuit 1 according to actual needs, which is well known to those skilled in the art and will not be repeated here.

[0030] Further, the second-stage compensation circuit includes an inductor L2, one end of the inductor L2 is connected to the cathode end of the varactor VR1, the other end of the inductor L2 is connected to the cathode end of the varactor VR2, one end of the inductor L1, one end of the capacitor C9 and one end of the capacitor C14, the anode end of the varactor VR2 is grounded, and the other end of the inductor L1 receives the compensation voltage VC2 provided by the control circuit 1 through the resistor R1; the other end of the capacitor C14 is connected to one end of the resistor R4 and the cathode end of the varactor VR5, the anode end of the varactor VR5 is grounded, the other end of the resistor R4 is connected to one end of the inductor L11, the other end of the inductor L11 is connected to the other end of the inductor L9 and one end of the capacitor C23, and the other end of the capacitor C23 is grounded.

[0031] In the embodiment of the present invention, the inductor L2 is used to achieve capacitive-inductive-reactance matching, the resistor R1 and the resistor R4 are current-limiting resistors, and the inductor L11 and the inductor L1 are both high-frequency inductors. The signal compensated by the first-stage compensation circuit and the second-stage compensation circuit can change the group delay under the action of the compensation voltage VC2, realize phase correction, compensate for the dispersion generated by the optical fiber transmission, improve the signal, and enter the next stage of compensation.

[0032] Further, the third-stage compensation circuit includes an inductor L3, one end of the inductor L3 is connected to the other end of the capacitor C9, the other end of the inductor L3 is connected to one end of the capacitor C4, one end of the capacitor C10 and one end of the resistor R3, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C18, the other end of the capacitor C18 is connected to the cathode end of the varactor diode VR7, one end of the resistor R7 is connected to the other end of the capacitor C18, the other end of the resistor R7 is connected to one end of the inductor L12, and the other end of the inductor L12 can receive the control circuit 1. The compensation voltage VC3 is supplied, and the other end of the inductor L12 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the capacitor C27 and one end of the inductor L10, the other end of the capacitor C27 is grounded, the other end of the inductor L10 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the capacitor C10, the cathode end of the varactor VR3 and one end of the inductor L4, the other end of the inductor L4 is connected to the cathode end of the varactor VR4, and the anode end of the varactor VR3 and the anode end of the varactor VR4 are both grounded.

[0033] In the embodiment of the present invention, the inductor L2 and the inductor L10 are both high-frequency inductors, the resistors R7 and R12 are current-limiting resistors, and after being compensated by the second-stage compensation circuit, the third-stage compensation circuit can further change the group delay under the action of the compensation voltage VC3, realize phase correction, and compensate for the dispersion generated by optical fiber transmission. In addition, the capacitors C9, C5, and C12 function to block direct current and pass alternating current.

[0034] Furthermore, the output matching impedance transformation circuit includes an impedance transformer T1, one end of the primary coil of the impedance transformer T1 is connected to one end of the capacitor C3 and one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 and the other end of the capacitor C3 are both grounded; the other end of the primary coil of the impedance transformer T1 is connected to one end of the inductor L6, and one end of the secondary coil of the impedance transformer T1 is connected to the amplitude modulation compensation circuit 4; the other end of the inductor L6 is connected to one end of the capacitor C16 and one end of the capacitor C5, the other end of the capacitor C16 is grounded, and the other end of the capacitor C5 is connected to the third-level compensation circuit.

[0035] In the embodiment of the present invention, the radio frequency signal can be converted into a 75-ohm signal by the impedance transformer T1, and matched by the capacitor C3, the capacitor C1 and the resistor R2, that is, the processed signal is then transmitted to the amplitude modulation compensation circuit 4.

[0036] In specific implementation, after compensation through the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit, the group delay can be compensated to the maximum extent, and the dispersion problem generated in the optical fiber after entering the laser can be eliminated, thereby achieving a longer transmission distance of the optical fiber.

[0037] like Figure 3 As shown, the amplitude modulation compensation circuit 4 includes a chip U1, and the chip U1 adopts a chip model DS1090, the J0 end of the chip U1 is connected to one end of the resistor R10, the J1 end of the chip U1 is connected to one end of the resistor R11, the JC0 of the chip U1 is connected to one end of the resistor R3, the JC1 end of the chip U1 is connected to one end of the resistor R15, the other end of the resistor R10 and the other end of the resistor R11 are both grounded, the other end of the resistor R13 and the other end of the resistor R15 are connected to a +3.3V voltage and connected to one end of the capacitor C24, and the other end of the capacitor C24 is grounded;

[0038] The GND terminal of the chip U1 is grounded, the Vcc terminal of the chip U1 receives a +3.3V voltage and is connected to one end of the capacitor C22, and the other end of the capacitor C22 is grounded; the Rset terminal of the chip U1 is grounded through the resistor R14; the OUT terminal of the chip U1 is connected to one end of the resistor R16, and the other end of the resistor R16 is connected to the moving end of the potentiometer w1, and the potentiometer w1 is also connected to one end of the inductor L13 and one end of the capacitor C26, and the other end of the inductor L13 is connected to one end of the capacitor C25 and one end of the resistor R8, and the other end of the resistor R8 is connected to one end of the capacitor C19 and one end of the capacitor C20, and the other end of the capacitor C26, the other end of the capacitor C25, and the other end of the capacitor C19 are all grounded;

[0039] The other end of capacitor C20 is connected to one end of inductor L7, the other end of inductor L7 is connected to one end of capacitor C11, one end of capacitor C7 and one end of capacitor C13, one end of capacitor C7 is grounded, the other end of capacitor C11 is connected to the secondary coil of impedance transformer T1, and the other end of capacitor C13 is connected to the input port of the laser.

[0040] Specifically, due to the different wavelengths of optical fiber transmission, some different deviations will be generated, resulting in differences in compensation, and the full channel transmission of 1500-1600nm cannot be achieved. Therefore, different lasers require different dispersion compensation voltages each time. In order to improve the above problems, the bandwidth of the adjustment signal can be increased through the amplitude modulation compensation circuit 4, the line width of the adjustable light source can be achieved, the adjustment spectrum width of the light source can be achieved, and the frequency domain method can be achieved.

[0041] In the embodiment of the present invention, the RF index is further improved by the amplitude modulation compensation circuit 4. A signal modulating circuit 4 is added to the optical fiber to improve the optical dispersion compensation, and the added amplitude modulation compensation circuit 4 provides an adjustment range for the line width or spectrum width of the light source.

[0042] In specific implementation, the potentiometer W1 is provided with a corresponding divided voltage by the control circuit 1, and the amplitude is adjusted according to different transmission optical fiber lengths. The power supply voltage of the chip U1 is +3.3V, and a frequency signal can be generated through the chip U1, and the output frequency signal amplitude is adjusted through the potentiometer and the microcontroller input voltage. A resonant circuit is formed by the inductor L13 and the capacitor C25, and then a high-pass filter is formed by the resistor R8 and the capacitor C19, and the LC circuit is formed by the capacitor C20 and the inductor L7, and then loaded into the RF signal to achieve frequency domain adjustment.

[0043] The above describes the basic principles, main features and advantages of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A long-distance optical dispersion compensation device, comprising an optical dispersion compensation circuit (3), characterized in that: The optical dispersion compensation circuit (3) comprises a first-stage compensation circuit, a second-stage compensation circuit and a third-stage compensation circuit capable of performing optical dispersion compensation, wherein the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit are connected in sequence, and the first-stage compensation circuit is also connected to an input matching impedance conversion circuit, and the third-stage compensation circuit is connected to an output matching impedance conversion circuit; It also includes a radio frequency amplifying circuit (2) adaptively connected to the input matching impedance conversion circuit and an amplitude modulation compensation circuit (4) adaptively connected to the output matching impedance conversion circuit, wherein the radio frequency amplifying circuit (2) and the amplitude modulation compensation circuit (4) are both connected to the control circuit (1), and the control circuit (1) can also provide the compensation voltage required by the first-stage compensation circuit, the second-stage compensation circuit and the third-stage compensation circuit; The first-stage compensation circuit comprises an inductor L5, one end of the inductor L5 is connected to one end of the capacitor C2, one end of the capacitor C12 and one end of the capacitor C17, the other end of the capacitor C17 is grounded via the inductor L8, the other end of the capacitor C2 is grounded, the other end of the inductor L5 is connected to one end of the capacitor C8, the cathode end of the varactor VR1 and one end of the capacitor C15, the other end of the capacitor C8 and the anode end of the varactor VR1 are both grounded, the other end of the capacitor C15 is connected to the cathode end of the varactor VR6 and one end of the resistor R6, the other end of the resistor R6 is connected to one end of the inductor L9, the other end of the inductor L9 receives the compensation voltage VC1 output by the control circuit (1), and the other end of the inductor L9 is connected to the second-stage compensation circuit; The second-stage compensation circuit comprises an inductor L2, one end of the inductor L2 is connected to the cathode end of the varactor VR1, the other end of the inductor L2 is connected to the cathode end of the varactor VR2, one end of the inductor L1, one end of the capacitor C9 and one end of the capacitor C14, the anode end of the varactor VR2 is grounded, and the other end of the inductor L1 receives the compensation voltage VC2 provided by the control circuit (1) through the resistor R1; the other end of the capacitor C14 is connected to one end of the resistor R4 and the cathode end of the varactor VR5, the anode end of the varactor VR5 is grounded, the other end of the resistor R4 is connected to one end of the inductor L11, the other end of the inductor L11 is connected to the other end of the inductor L9 and one end of the capacitor C23, and the other end of the capacitor C23 is grounded; The third stage compensation circuit comprises an inductor L3, one end of the inductor L3 is connected to the other end of the capacitor C9, the other end of the inductor L3 is connected to one end of the capacitor C4, one end of the capacitor C10 and one end of the resistor R3, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C18, the other end of the capacitor C18 is connected to the cathode end of the varactor diode VR7, one end of the resistor R7 is connected to the other end of the capacitor C18, the other end of the resistor R7 is connected to one end of the inductor L12, and the other end of the inductor L12 can receive the control circuit (1) provided by the control circuit (1) The compensation voltage VC3 is provided, and the other end of the inductor L12 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the capacitor C27 and one end of the inductor L10, the other end of the capacitor C27 is grounded, the other end of the inductor L10 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the capacitor C10, the cathode end of the varactor VR3 and one end of the inductor L4, the other end of the inductor L4 is connected to the cathode end of the varactor VR4, and the anode end of the varactor VR3 and the anode end of the varactor VR4 are both grounded; The amplitude modulation compensation circuit (4) comprises a chip U1, wherein the chip U1 is a DS1090 chip, wherein a J0 terminal of the chip U1 is connected to one end of a resistor R10, a J1 terminal of the chip U1 is connected to one end of a resistor R11, a JC0 terminal of the chip U1 is connected to one end of a resistor R3, a JC1 terminal of the chip U1 is connected to one end of a resistor R15, the other end of the resistor R10 and the other end of the resistor R11 are both grounded, the other end of the resistor R13 and the other end of the resistor R15 are connected to a +3.3 V voltage and are connected to one end of a capacitor C24, and the other end of the capacitor C24 is grounded; The GND terminal of the chip U1 is grounded, the Vcc terminal of the chip U1 receives a +3.3V voltage and is connected to one end of the capacitor C22, and the other end of the capacitor C22 is grounded; the Rset terminal of the chip U1 is grounded through the resistor R14; the OUT terminal of the chip U1 is connected to one end of the resistor R16, and the other end of the resistor R16 is connected to the moving end of the potentiometer w1, and the potentiometer w1 is also connected to one end of the inductor L13 and one end of the capacitor C26, and the other end of the inductor L13 is connected to one end of the capacitor C25 and one end of the resistor R8, and the other end of the resistor R8 is connected to one end of the capacitor C19 and one end of the capacitor C20, and the other end of the capacitor C26, the other end of the capacitor C25, and the other end of the capacitor C19 are all grounded; The other end of capacitor C20 is connected to one end of inductor L7, the other end of inductor L7 is connected to one end of capacitor C11, one end of capacitor C7 and one end of capacitor C13, one end of capacitor C7 is grounded, the other end of capacitor C11 is connected to the secondary coil of impedance transformer T1, and the other end of capacitor C13 is connected to the input port of the laser.

2. The long-distance optical dispersion compensation device according to claim 1, characterized in that: The input matching impedance conversion circuit comprises an impedance transformer T2, one end of the primary coil of the impedance transformer T2 is connected to the output end of the radio frequency amplification circuit (2), the other end of the primary coil of the impedance transformer T2 is grounded, one end of the secondary coil of the impedance transformer T2 is connected to one end of a capacitor C12, and the other end of the capacitor C12 is connected to the first-stage compensation circuit.

3. The long-distance optical dispersion compensation device according to claim 1, characterized in that: The output matching impedance conversion circuit comprises an impedance transformer T1, one end of the primary coil of the impedance transformer T1 is connected to one end of a capacitor C3 and one end of a resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 and the other end of the capacitor C3 are both grounded; the other end of the primary coil of the impedance transformer T1 is connected to one end of an inductor L6, and one end of the secondary coil of the impedance transformer T1 is connected to an amplitude modulation compensation circuit (4); the other end of the inductor L6 is connected to one end of a capacitor C16 and one end of a capacitor C5, the other end of the capacitor C16 is grounded, and the other end of the capacitor C5 is connected to a third-stage compensation circuit.

4. The long-distance optical dispersion compensation device according to claim 1, characterized in that: The control circuit (1) comprises a single chip microcomputer.

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