Long wave signal simulation photon link transmission device

Abstract

The invention relates to the technical field of long-wave communication, and particularly discloses a long-wave signal simulation photon link transmission device which comprises a long-wave light emitting module and a long-wave light receiving module. The long-wave light transmitting module comprises a transmitting balance single-end conversion circuit, a transmitting band-pass filtering and amplifying circuit, a transmitting electro-optical conversion module and a transmitting light indicating circuit; the long-wave light receiving module comprises a receiving photoelectric conversion module, a receiving band-pass filtering and amplifying circuit, a receiving single-end balance conversion circuit and a receiving light indicating circuit. The problem of long-wave signal optical fiber transmission error codes caused by signal cycle skipping and phase inversion is eliminated, the low-frequency-band frequency characteristics of lasers and detectors of existing models are optimized, the production cost is greatly reduced, the size is small, integration is easy, and further miniaturization can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of long-wave communications, and in particular to a long-wave signal simulation photon link transmission device. Background Art

[0002] At present, long-wave communication is the most basic means of communication for deep-sea submarines due to its stable propagation and strong penetration ability. However, due to the skin effect of seawater, the propagation of electromagnetic waves in seawater is affected, and the depth of communication from the surface to underwater is limited. As a result, even the most concealed deep-sea submarines need to surface to a certain depth to receive relatively weak signals. In order to reduce the risk of submarine exposure and counter advanced anti-submarine technology, deep-sea submarines usually release fiber-optic communication buoys instead of surfacing to receive long-wave signals. The submarine receives long-wave signals through a long-wave ferrite buoy antenna suspended at the sea level or hovering in seawater at a certain depth, and then transmits the signals to the submarine through a simulated fiber-optic transmission. The transmission system transmits the long-wave signal far away into the deep-sea submarine. In fact, the long-wave antenna is pulled away through the optical fiber to achieve the coverage of the long-wave signal to the special area. The analog signal optical fiber transmission technology utilizes the many excellent characteristics of optical fiber transmission, such as low loss, wide bandwidth, light weight, small size, and immunity to electromagnetic interference. It can solve the problem of signal coverage in a specific area over a long distance and a large range. It is a technology that can directly transmit analog signals suitable for wireless transmission over long distances through wired optical fibers. It is the simplest and most effective means to solve the blind spots that wireless signals cannot cover. It has very wide applications in many fields such as communications, electronic reconnaissance, electronic countermeasures, radar, aerospace, etc.

[0003] In the prior art, the long-wave signal optical fiber transmission system usually adopts the baseband digital optical fiber transmission method. Generally, the long-wave signal received by the long-wave ferrite buoy antenna is first digitized into a digital baseband signal through an analog-to-digital converter, and then transmitted to the deep-sea submarine through the baseband digital optical fiber transmission method, and then the long-wave signal is restored through the digital-to-analog converter.

[0004] However, in the existing technology, long-wave signals are subjected to complex conversions back and forth between the analog domain and the digital domain. Due to the inherent characteristics of the converters during the analog-to-digital conversion and digital-to-analog conversion processes, there are occasional problems of signal skipping and phase reversal, which increase the bit error rate of the transmission link, further reducing communication efficiency and failing to meet the needs of efficient submarine communication applications. Summary of the invention

[0005] The purpose of the present invention is to provide a long-wave signal analog photonic link transmission device, aiming to solve the technical problem that in the prior art, long-wave signals undergo complex conversions back and forth between the analog domain and the digital domain, and in the process of analog-to-digital conversion and digital-to-analog conversion, due to the inherent characteristics of the converter, there are occasional problems of signal cycle skipping and phase reversal, which increase the bit error rate of the transmission link, further reduce the communication efficiency, and cannot meet the requirements of efficient submarine communication applications.

[0006] To achieve the above-mentioned purpose, the present invention adopts a long-wave signal simulation photon link transmission device, including a long-wave optical transmitting module and a long-wave optical receiving module, wherein the long-wave optical transmitting module processes the long-wave signal received by the antenna and loads it onto the optical carrier in an intensity-modulated manner to form an optical carrier signal carrying the long-wave signal, and the long-wave optical receiving module demodulates the optical carrier signal carrying the long-wave signal into the long-wave signal by direct demodulation; the long-wave optical transmitting module includes a transmitting balanced single-ended conversion circuit, a transmitting band-pass filtering and amplifying circuit, a transmitting electro-optical conversion module and a transmitting optical indication circuit; the long-wave optical receiving module includes a receiving optical-to-electrical conversion module, a receiving band-pass filtering and amplifying circuit, a receiving single-ended balanced conversion circuit and a receiving optical indication circuit.

[0007] The transmitting balanced single-ended conversion circuit includes a balanced input interface J1, an operational amplifier U1A, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4 and a Schottky diode D4, one end of the capacitor C1 and the capacitor C2 are respectively connected to the balanced input interface J1, the other ends of the capacitor C1 and the capacitor C2 are respectively connected to the two ends of the resistor R1, and the negative input end of the operational amplifier U1A is respectively connected to the resistor R2 is connected to one end of the resistor R5, the other end of the resistor R2 is connected to the capacitor C1, the other end of the resistor R5 is connected to the output end of the operational amplifier U1A, the positive input end of the operational amplifier U1A is respectively connected to one end of the resistor R3 and the resistor R4, the other end of the resistor R3 is connected to the capacitor C2, the other end of the resistor R4 is grounded, and the Schottky diode D2, the Schottky diode D3, the Schottky diode D4 and the Schottky diode D4 are respectively connected to the balanced input end interface J1.

[0008] Wherein, the transmitting bandpass filter amplifier circuit includes resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, operational amplifier U1B and operational amplifier U2A, one end of the resistor R6 is connected to the output end of the operational amplifier U1A, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, one end of the resistor R8 and the capacitor C3 are connected in parallel with one end of the resistor R7, the other end of R8 is connected to the positive input end of the operational amplifier U1B, the other end of the capacitor C3 is connected to the output end of the operational amplifier U1B, and the capacitor C4 is connected in parallel to the operational amplifier The resistor R9 is connected in series between the output and negative input of the operational amplifier U1B, one end of the resistor R10 is connected to the negative input of the operational amplifier U1B, and the other end is grounded, one end of the capacitor C5 is connected to the output of the operational amplifier U1B, the other end of the capacitor C5 is connected in parallel with the capacitor C6 and the resistor R11, the other end of the capacitor C6 is connected to the positive input of the operational amplifier U2A, the other end of the resistor R11 is connected to the output of the operational amplifier U2A, the output of the operational amplifier U2A is connected to its negative input through the resistor R13, the negative input of the operational amplifier U2A is grounded through the resistor R14, and the capacitor C7 is connected to the output of the operational amplifier U2A.

[0009] Wherein, the transmitting electro-optical conversion module includes a resistor R15, a resistor R16, an inductor L1, a laser U5, an optical power control chip U3, a potentiometer W1 and a capacitor C8, the first pin of the optical power control chip U3 is connected to -5V, the fifth pin and the sixth pin of the optical power control chip U3 are grounded, the seventh pin of the optical power control chip U3 is connected to the fourth pin of the laser U5, the eighth pin of the optical power control chip U3 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the second pin of the laser U5 and one end of the resistor R15 through the inductor L1, the other end of the resistor R15 is connected to the capacitor C7, the first pin and the third pin of the laser U5 are grounded, one end of the potentiometer W1 is connected to the fourth pin of the optical power control chip U3, and the other end of the potentiometer W1 is connected to -5V.

[0010] Among them, the emitted light indication circuit includes an operational amplifier U4, a resistor R17, a resistor R18, a transistor Q1 and an indicator light D1. The first pin of the operational amplifier U4 is connected in parallel with the B pole of the transistor Q1 and one end of the resistor R18 through the resistor R17. The other end of the resistor R18 is grounded, the E pole of the transistor Q1 is grounded, the C pole of the transistor Q1 is connected to the negative pole of the indicator light D1, the positive pole of the indicator light D1 is connected to +5V, the second pin of the operational amplifier U4 is grounded, the third pin of the operational amplifier U4 is connected to +5V, the fourth pin of the operational amplifier U4 is connected to the junction of the inductor L1 and the resistor R16, and the fifth pin of the operational amplifier U4 is connected to the junction of the optical power control chip U3 and the resistor R16.

[0011] The receiving photoelectric conversion module includes a photodetector U5, a resistor R19, a resistor R20, an inductor L2, a capacitor C9 and a capacitor C10. The positive electrode of the photodetector U5 is grounded, the negative electrode of the photodetector U5 is connected in parallel with the capacitor C10, the resistor R20 and the inductor L2, the other end of the resistor R20 is grounded through the capacitor C9, and the other end of the inductor is connected to +5V through the resistor R19.

[0012] Wherein, the receiving bandpass filter amplifier circuit includes an operational amplifier U6A, an operational amplifier U6B, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, one end of the resistor R21 is connected to the capacitor C10, the other end of the resistor R21 is connected in parallel with the resistor R22, the resistor R23 and the capacitor C11, the other end of the resistor R22 is grounded, the other end of the capacitor C11 is connected to the output end of the operational amplifier U6A, the resistor R23 is connected to the positive terminal of the operational amplifier U6A, one end of the capacitor C12 is connected to the positive terminal of the operational amplifier U6A, and the other end is grounded, The resistor R24 ​​is connected in series between the output terminal and the negative terminal of the operational amplifier U6A, one end of the resistor R25 is connected to the negative input terminal of the operational amplifier U6A, and the other end is grounded, the capacitor C13 is connected to the output terminal of the operational amplifier U6A, the other end of the capacitor C13 is connected in parallel with the capacitor C14 and the resistor R27, the other end of the capacitor C14 is connected to the positive terminal of the operational amplifier U6B, the other end of the resistor R27 is connected to the output terminal of the operational amplifier U6B, the output terminal of the operational amplifier U6B is connected to its negative terminal through the resistor R28, the negative terminal of the operational amplifier U6B is grounded through the resistor R29, the positive terminal of the operational amplifier U6B is grounded through the resistor R26, and the output terminal of the operational amplifier U6B is connected to the capacitor C15.

[0013] The receiving single-ended balanced conversion circuit includes an operational amplifier U7, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a capacitor C16, a capacitor C17, an output interface J2 and a potentiometer W2, one end of the resistor R31 and the resistor R32 are connected to the positive terminal of the operational amplifier U7, the other end of the resistor R31 is connected to the capacitor C15 and the resistor R30, the other end of the resistor R30 is grounded, the other end of the resistor R32 is connected to the negative output terminal O- of the operational amplifier U7, and the negative input terminal of the operational amplifier U7 is respectively connected to the positive terminal O- of the operational amplifier U7. The resistor R33 and the resistor R34 are connected, the other end of the resistor R33 is grounded, the other end of the resistor R34 is connected to the positive output terminal O+ of the operational amplifier U7, the positive output terminal O+ of the operational amplifier U7 is connected in series with the capacitor C17 through the resistor R36 and connected to the second pin of the output interface J2, the negative output terminal O- of the operational amplifier U7 is connected in series with the capacitor C16 through the resistor R35 and connected to the first pin of the output interface J2, the second pin of the operational amplifier U7 is connected to the potentiometer W2, and the two ends of the potentiometer W2 are respectively connected to +5V and ground.

[0014] Among them, the received light indication circuit includes an operational amplifier U8, a resistor R37, a resistor R38, a transistor U9 and an indicator light D2. The resistor R37, the resistor R38 and the B end of the transistor U9 are connected in parallel to the first pin of the operational amplifier U8, the other end of the resistor R38 is grounded, the E end of the transistor U9 is grounded, the negative end of the indicator light D2 is connected to the C end of the transistor U9, the positive end of the indicator light D2 is connected to +5V, the third pin and the fifth pin of the operational amplifier U8 are respectively connected to +5V, the second pin of the operational amplifier U8 is grounded, and the fourth pin of the operational amplifier U8 is connected to the junction of the inductor L2 and the resistor R19.

[0015] A long-wave signal simulation photon link transmission device of the present invention has the following beneficial effects:

[0016] 1. The analog signal is used to directly modulate the optical carrier, eliminating the analog-to-digital and digital-to-analog converters, and completely eliminating the problem of long-wave signal optical fiber transmission bit errors caused by signal skipping and phase reversal;

[0017] 2. The low-frequency characteristics of existing lasers and detectors are optimized by using peripheral device compensation, which greatly reduces production costs;

[0018] 3. Small size, easy to integrate, and can be further miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a system diagram of a long-wave signal simulation photon link transmission device of the present invention.

[0021] Figure 2 It is a circuit diagram of the long-wave optical emission module of the present invention.

[0022] Figure 3 It is a circuit diagram of the transmitting balanced single-ended conversion circuit of the present invention.

[0023] Figure 4 It is a circuit diagram of the transmitting bandpass filter amplifier circuit of the present invention.

[0024] Figure 5 It is a circuit diagram of the emission electro-optical conversion module of the present invention.

[0025] Figure 6 It is the ascending staircase of the emission light indicating circuit of the present invention.

[0026] Figure 7 It is a circuit diagram of the long-wave optical receiving module of the present invention.

[0027] Figure 8 It is a circuit diagram of the receiving photoelectric conversion module of the present invention.

[0028] Fig. 9 It is a circuit diagram of the receiving bandpass filter amplifier circuit of the present invention.

[0029] Fig.10 It is a circuit diagram of a receiving single-ended balanced conversion circuit of the present invention.

[0030] Fig.11 It is a circuit diagram of the received light indicating circuit of the present invention.

[0031] 101-long wave optical transmitting module, 102-long wave optical receiving module, 103-transmitting balanced single-ended conversion circuit, 104-transmitting bandpass filtering and amplifying circuit, 105-transmitting electro-optical conversion module, 106-transmitting light indication circuit, 107-receiving photoelectric conversion module, 108-receiving bandpass filtering and amplifying circuit, 109-receiving single-ended balanced conversion circuit, 110-receiving light indication circuit. DETAILED DESCRIPTION

[0032] See also Figures 1 to 11 , Figure 1 It is a system diagram of a long-wave signal simulation photon link transmission device of the present invention; Figure 2 is a circuit diagram of the long-wavelength optical transmission module of the present invention; Figure 3 It is a circuit diagram of a transmitting balanced single-ended conversion circuit of the present invention; Figure 4 It is a circuit diagram of a transmitting bandpass filter amplifier circuit of the present invention; Figure 5 is a circuit diagram of the emission electro-optical conversion module of the present invention; Figure 6 It is the staircase of the light emitting indication circuit of the present invention; Figure 7 is a circuit diagram of a long-wave optical receiving module of the present invention; Figure 8 is a circuit diagram of a receiving photoelectric conversion module of the present invention; Fig. 9 It is a circuit diagram of a receiving bandpass filter amplifier circuit of the present invention; Fig.10 It is a circuit diagram of a receiving single-ended balanced conversion circuit of the present invention; Fig.11 It is a circuit diagram of the received light indicating circuit of the present invention.

[0033] The present invention provides a long-wave signal analog photon link transmission device, comprising a long-wave optical transmitting module 101 and a long-wave optical receiving module 102, wherein the long-wave optical transmitting module 101 processes the long-wave signal received by the antenna and then loads it onto an optical carrier in an intensity-modulated manner to form an optical carrier signal carrying the long-wave signal, and the long-wave optical receiving module 102 demodulates the optical carrier signal carrying the long-wave signal into a long-wave signal by directly demodulating the signal;

[0034] The long-wave optical transmitting module 101 includes a transmitting balanced single-ended conversion circuit 103, a transmitting band-pass filter amplifier circuit 104, a transmitting electro-optical conversion module 105 and a transmitting light indication circuit 106;

[0035] The long-wave optical receiving module 102 includes a receiving photoelectric conversion module 107 , a receiving bandpass filter amplifier circuit 108 , a receiving single-ended balanced conversion circuit 109 and a receiving light indication circuit 110 .

[0036] Furthermore, the transmitting balanced single-ended conversion circuit 103 includes a balanced input interface J1, an operational amplifier U1A, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4 and a Schottky diode D4, one end of the capacitor C1 and the capacitor C2 are respectively connected to the balanced input interface J1, the other ends of the capacitor C1 and the capacitor C2 are respectively connected to the two ends of the resistor R1, and the negative input end of the operational amplifier U1A is respectively connected to the The resistor R2 is connected to one end of the resistor R5, the other end of the resistor R2 is connected to the capacitor C1, the other end of the resistor R5 is connected to the output end of the operational amplifier U1A, the positive input end of the operational amplifier U1A is respectively connected to one end of the resistor R3 and the resistor R4, the other end of the resistor R3 is connected to the capacitor C2, the other end of the resistor R4 is grounded, and the Schottky diode D2, the Schottky diode D3, the Schottky diode D4 and the Schottky diode D4 are respectively connected to the balanced input interface J1.

[0037] Further, the transmitting bandpass filter amplifier circuit 104 includes a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an operational amplifier U1B and an operational amplifier U2A, one end of the resistor R6 is connected to the output end of the operational amplifier U1A, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, one end of the resistor R8 and the capacitor C3 are connected in parallel with one end of the resistor R7, the other end of R8 is connected to the positive input end of the operational amplifier U1B, the other end of the capacitor C3 is connected to the output end of the operational amplifier U1B, and the capacitor C4 is connected in parallel to the operational amplifier The resistor R9 is connected in series between the output and negative input of the operational amplifier U1B, one end of the resistor R10 is connected to the negative input of the operational amplifier U1B, and the other end is grounded, one end of the capacitor C5 is connected to the output of the operational amplifier U1B, the other end of the capacitor C5 is connected in parallel with the capacitor C6 and the resistor R11, the other end of the capacitor C6 is connected to the positive input of the operational amplifier U2A, the other end of the resistor R11 is connected to the output of the operational amplifier U2A, the output of the operational amplifier U2A is connected to its negative input through the resistor R13, the negative input of the operational amplifier U2A is grounded through the resistor R14, and the capacitor C7 is connected to the output of the operational amplifier U2A.

[0038] Furthermore, the transmitting electro-optical conversion module 105 includes a resistor R15, a resistor R16, an inductor L1, a laser U5, an optical power control chip U3, a potentiometer W1 and a capacitor C8, the first pin of the optical power control chip U3 is connected to -5V, the fifth pin and the sixth pin of the optical power control chip U3 are grounded, the seventh pin of the optical power control chip U3 is connected to the fourth pin of the laser U5, the eighth pin of the optical power control chip U3 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the second pin of the laser U5 and one end of the resistor R15 through the inductor L1, the other end of the resistor R15 is connected to the capacitor C7, the first pin and the third pin of the laser U5 are grounded, one end of the potentiometer W1 is connected to the fourth pin of the optical power control chip U3, and the other end of the potentiometer W1 is connected to -5V.

[0039] Furthermore, the emitted light indication circuit 106 includes an operational amplifier U4, a resistor R17, a resistor R18, a transistor Q1 and an indicator light D1. The first pin of the operational amplifier U4 is connected in parallel with the B pole of the transistor Q1 and one end of the resistor R18 through the resistor R17, the other end of the resistor R18 is grounded, the E pole of the transistor Q1 is grounded, the C pole of the transistor Q1 is connected to the negative pole of the indicator light D1, the positive pole of the indicator light D1 is connected to +5V, the second pin of the operational amplifier U4 is grounded, the third pin of the operational amplifier U4 is connected to +5V, the fourth pin of the operational amplifier U4 is connected to the junction of the inductor L1 and the resistor R16, and the fifth pin of the operational amplifier U4 is connected to the junction of the optical power control chip U3 and the resistor R16.

[0040] Furthermore, the receiving photoelectric conversion module 107 includes a photodetector U5, a resistor R19, a resistor R20, an inductor L2, a capacitor C9 and a capacitor C10, the positive electrode of the photodetector U5 is grounded, the negative electrode of the photodetector U5 is connected in parallel with the capacitor C10, the resistor R20 and the inductor L2, the other end of the resistor R20 is grounded through the capacitor C9, and the other end of the inductor is connected to +5V through the resistor R19.

[0041] Further, the receiving bandpass filter amplifier circuit 108 includes an operational amplifier U6A, an operational amplifier U6B, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, one end of the resistor R21 is connected to the capacitor C10, the other end of the resistor R21 is connected in parallel with the resistor R22, the resistor R23 and the capacitor C11, the other end of the resistor R22 is grounded, the other end of the capacitor C11 is connected to the output end of the operational amplifier U6A, the resistor R23 is connected to the positive terminal of the operational amplifier U6A, one end of the capacitor C12 is connected to the positive terminal of the operational amplifier U6A, and the other end is grounded. The resistor R24 ​​is connected in series between the output end and the negative terminal of the operational amplifier U6A, one end of the resistor R25 is connected to the negative input terminal of the operational amplifier U6A, and the other end is grounded, the capacitor C13 is connected to the output end of the operational amplifier U6A, the other end of the capacitor C13 is connected in parallel with the capacitor C14 and the resistor R27, the other end of the capacitor C14 is connected to the positive terminal of the operational amplifier U6B, the other end of the resistor R27 is connected to the output end of the operational amplifier U6B, the output end of the operational amplifier U6B is connected to its negative terminal through the resistor R28, the negative terminal of the operational amplifier U6B is grounded through the resistor R29, the positive terminal of the operational amplifier U6B is grounded through the resistor R26, and the output end of the operational amplifier U6B is connected to the capacitor C15.

[0042] Further, the receiving single-ended balanced conversion circuit 109 includes an operational amplifier U7, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a capacitor C16, a capacitor C17, an output interface J2 and a potentiometer W2, one end of the resistor R31 and the resistor R32 are connected to the positive terminal of the operational amplifier U7, the other end of the resistor R31 is connected to the capacitor C15 and the resistor R30, the other end of the resistor R30 is grounded, the other end of the resistor R32 is connected to the negative output terminal O- of the operational amplifier U7, and the negative input terminal of the operational amplifier U7 is connected to the negative input terminal O- of the operational amplifier U7. The ends are respectively connected to the resistor R33 and the resistor R34, the other end of the resistor R33 is grounded, the other end of the resistor R34 is connected to the positive output terminal O+ of the operational amplifier U7, the positive output terminal O+ of the operational amplifier U7 is connected to the second pin of the output interface J2 after being connected in series with the capacitor C17 through the resistor R36, the negative output terminal O- of the operational amplifier U7 is connected to the first pin of the output interface J2 after being connected in series with the capacitor C16 through the resistor R35, the second pin of the operational amplifier U7 is connected to the potentiometer W2, and the two ends of the potentiometer W2 are respectively connected to +5V and ground.

[0043] Furthermore, the received light indication circuit 110 includes an operational amplifier U8, a resistor R37, a resistor R38, a transistor U9 and an indicator light D2, the resistor R37, the resistor R38 and the B end of the transistor U9 are connected in parallel to the first pin of the operational amplifier U8, the other end of the resistor R38 is grounded, the E end of the transistor U9 is grounded, the negative end of the indicator light D2 is connected to the C end of the transistor U9, the positive end of the indicator light D2 is connected to +5V, the third pin and the fifth pin of the operational amplifier U8 are respectively connected to +5V, the second pin of the operational amplifier U8 is grounded, and the fourth pin of the operational amplifier U8 is connected to the junction of the inductor L2 and the resistor R19.

[0044] In this embodiment, the long-wave signal received by the long-wave antenna enters the transmitting balanced single-ended conversion circuit 103 through the balanced line, is converted into a single-ended signal and enters the transmitting bandpass filter amplifier circuit 104, filters out the out-of-band noise interference and amplifies the long-wave signal to a suitable amplitude, drives the transmitting electro-optical conversion module 105 to complete the modulation of the optical carrier signal by the long-wave signal. Because the laser is sensitive to temperature, there is temperature drift. In order to ensure the stability of the laser, it is necessary to automatically control the temperature and power of the laser to ensure the stable operation of the device. The transmitting light indication circuit 106 The working current of the monitoring laser is converted into an indicator light display. The on and off of the indicator light indicates whether the laser is operating normally. The optical carrier output by the transmitting electro-optical conversion module 105 enters the long-wave optical receiving module 102 after long-distance optical fiber transmission. The optical carrier signal is demodulated into a long-wave signal by the receiving photoelectric conversion module 107. The out-of-band noise interference is filtered out by the receiving bandpass filter amplifier circuit 108 and the long-wave signal is amplified to a suitable amplitude. Then, it is output with a suitable signal amplitude by the receiving single-ended balanced conversion circuit 109 and adapted to the original long-wave system interface.

[0045] In the transmitting electro-optical conversion module 105, the value of the output optical power is determined by the size of the potentiometer W1; in the receiving photoelectric conversion module 107, the size of the potentiometer W2 is determined and adjusted according to the reading of the optical power meter;

[0046] In the present invention, the analog signal is used to directly modulate the optical carrier, the analog-to-digital and digital-to-analog converters are removed, and the problem of long-wave signal optical fiber transmission bit errors caused by signal cycle skipping and phase reversal is completely eliminated; the low-frequency band frequency characteristics of existing models of lasers and detectors are optimized by using peripheral device compensation, greatly reducing the production cost; the device is small in size, easy to integrate, and can be further miniaturized.

[0047] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A long-wave signal simulation photon link transmission device, characterized in that: It comprises a long-wave optical transmitting module and a long-wave optical receiving module. The long-wave optical transmitting module processes the long-wave signal received by the antenna and then loads it onto the optical carrier in an intensity-modulated manner to form an optical carrier signal carrying the long-wave signal. The long-wave optical receiving module demodulates the optical carrier signal carrying the long-wave signal into the long-wave signal by direct demodulation. The long-wave optical transmitting module comprises a transmitting balanced single-ended conversion circuit, a transmitting band-pass filtering and amplifying circuit, a transmitting electro-optical conversion module and a transmitting optical indicating circuit. The long-wave optical receiving module comprises a receiving optical-electrical conversion module, a receiving band-pass filtering and amplifying circuit, a receiving single-ended balanced conversion circuit and a receiving optical indicating circuit.

2. A long-wave signal simulation photon link transmission device as claimed in claim 1, characterized in that: The transmitting balanced single-ended conversion circuit includes a balanced input interface J1, an operational amplifier U1A, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4 and a Schottky diode D4, one end of the capacitor C1 and the capacitor C2 are respectively connected to the balanced input interface J1, the other ends of the capacitor C1 and the capacitor C2 are respectively connected to the two ends of the resistor R1, and the negative input end of the operational amplifier U1A is respectively connected to the resistor R2. The resistor R2 is connected to one end of the resistor R5, the other end of the resistor R2 is connected to the capacitor C1, the other end of the resistor R5 is connected to the output end of the operational amplifier U1A, the positive input end of the operational amplifier U1A is respectively connected to one end of the resistor R3 and the resistor R4, the other end of the resistor R3 is connected to the capacitor C2, the other end of the resistor R4 is grounded, and the Schottky diode D2, the Schottky diode D3, the Schottky diode D4 and the Schottky diode D4 are respectively connected to the balanced input interface J1.

3. A long-wave signal simulation photon link transmission device as claimed in claim 2, characterized in that: The transmitting bandpass filter amplifier circuit includes a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an operational amplifier U1B and an operational amplifier U2A, one end of the resistor R6 is connected to the output end of the operational amplifier U1A, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, one end of the resistor R8 and the capacitor C3 are connected in parallel with one end of the resistor R7, the other end of R8 is connected to the positive input end of the operational amplifier U1B, the other end of the capacitor C3 is connected to the output end of the operational amplifier U1B, and the capacitor C4 is connected in parallel to the operational amplifier U1 B positive input terminal, and the other end is grounded, the resistor R9 is connected in series between the output terminal and the negative input terminal of the operational amplifier U1B, one end of the resistor R10 is connected to the negative input terminal of the operational amplifier U1B, and the other end is grounded, one end of the capacitor C5 is connected to the output terminal of the operational amplifier U1B, the other end of the capacitor C5 is connected in parallel with the capacitor C6 and the resistor R11, the other end of the capacitor C6 is connected to the positive input terminal of the operational amplifier U2A, the other end of the resistor R11 is connected to the output terminal of the operational amplifier U2A, the output terminal of the operational amplifier U2A is connected to its negative input terminal through the resistor R13, the negative input terminal of the operational amplifier U2A is grounded through the resistor R14, and the capacitor C7 is connected to the output terminal of the operational amplifier U2A.

4. A long-wave signal simulation photon link transmission device as claimed in claim 3, characterized in that: The transmitting electro-optical conversion module includes a resistor R15, a resistor R16, an inductor L1, a laser U5, an optical power control chip U3, a potentiometer W1 and a capacitor C8. The first pin of the optical power control chip U3 is connected to -5V, the fifth pin and the sixth pin of the optical power control chip U3 are grounded, the seventh pin of the optical power control chip U3 is connected to the fourth pin of the laser U5, the eighth pin of the optical power control chip U3 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the second pin of the laser U5 and one end of the resistor R15 through the inductor L1, the other end of the resistor R15 is connected to the capacitor C7, the first pin and the third pin of the laser U5 are grounded, one end of the potentiometer W1 is connected to the fourth pin of the optical power control chip U3, and the other end of the potentiometer W1 is connected to -5V.

5. A long-wave signal simulation photon link transmission device as claimed in claim 4, characterized in that: The emitted light indication circuit includes an operational amplifier U4, a resistor R17, a resistor R18, a transistor Q1 and an indicator light D1. The first pin of the operational amplifier U4 is connected in parallel with the B pole of the transistor Q1 and one end of the resistor R18 through the resistor R17. The other end of the resistor R18 is grounded, the E pole of the transistor Q1 is grounded, the C pole of the transistor Q1 is connected to the negative pole of the indicator light D1, the positive pole of the indicator light D1 is connected to +5V, the second pin of the operational amplifier U4 is grounded, the third pin of the operational amplifier U4 is connected to +5V, the fourth pin of the operational amplifier U4 is connected to the junction of the inductor L1 and the resistor R16, and the fifth pin of the operational amplifier U4 is connected to the junction of the optical power control chip U3 and the resistor R16.

6. A long-wave signal simulation photon link transmission device as claimed in claim 1, characterized in that: The receiving photoelectric conversion module includes a photodetector U5, a resistor R19, a resistor R20, an inductor L2, a capacitor C9 and a capacitor C10. The positive electrode of the photodetector U5 is grounded, the negative electrode of the photodetector U5 is connected in parallel with the capacitor C10, the resistor R20 and the inductor L2, the other end of the resistor R20 is grounded through the capacitor C9, and the other end of the inductor is connected to +5V through the resistor R19.

7. A long-wave signal simulation photon link transmission device as claimed in claim 6, characterized in that: The receiving bandpass filter amplifier circuit includes an operational amplifier U6A, an operational amplifier U6B, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, one end of the resistor R21 is connected to the capacitor C10, the other end of the resistor R21 is connected in parallel with the resistor R22, the resistor R23 and the capacitor C11, the other end of the resistor R22 is grounded, the other end of the capacitor C11 is connected to the output end of the operational amplifier U6A, the resistor R23 is connected to the positive terminal of the operational amplifier U6A, one end of the capacitor C12 is connected to the positive terminal of the operational amplifier U6A and the other end is grounded, the resistor R24 is connected in series between the output terminal and the negative terminal of the operational amplifier U6A, one end of the resistor R25 is connected to the negative input terminal of the operational amplifier U6A, and the other end is grounded, the capacitor C13 is connected to the output terminal of the operational amplifier U6A, the other end of the capacitor C13 is connected in parallel with the capacitor C14 and the resistor R27, the other end of the capacitor C14 is connected to the positive terminal of the operational amplifier U6B, the other end of the resistor R27 is connected to the output terminal of the operational amplifier U6B, the output terminal of the operational amplifier U6B is connected to its negative terminal through the resistor R28, the negative terminal of the operational amplifier U6B is grounded through the resistor R29, the positive terminal of the operational amplifier U6B is grounded through the resistor R26, and the output terminal of the operational amplifier U6B is connected to the capacitor C15.

8. A long-wave signal simulation photon link transmission device as claimed in claim 7, characterized in that: The receiving single-ended balanced conversion circuit includes an operational amplifier U7, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a capacitor C16, a capacitor C17, an output interface J2 and a potentiometer W2, one end of the resistor R31 and the resistor R32 are connected to the positive terminal of the operational amplifier U7, the other end of the resistor R31 is connected to the capacitor C15 and the resistor R30, the other end of the resistor R30 is grounded, the other end of the resistor R32 is connected to the negative output terminal O- of the operational amplifier U7, and the negative input terminal of the operational amplifier U7 is connected to The resistor R33 is connected to the resistor R34, the other end of the resistor R33 is grounded, the other end of the resistor R34 is connected to the positive output terminal O+ of the operational amplifier U7, the positive output terminal O+ of the operational amplifier U7 is connected in series with the capacitor C17 through the resistor R36 and connected to the second pin of the output interface J2, the negative output terminal O- of the operational amplifier U7 is connected in series with the capacitor C16 through the resistor R35 and connected to the first pin of the output interface J2, the second pin of the operational amplifier U7 is connected to the potentiometer W2, and the two ends of the potentiometer W2 are respectively connected to +5V and ground.

9. A long-wave signal simulation photon link transmission device as claimed in claim 6, characterized in that: The received light indication circuit includes an operational amplifier U8, a resistor R37, a resistor R38, a transistor U9 and an indicator light D2. The resistor R37, the resistor R38 and the B terminal of the transistor U9 are connected in parallel to the first pin of the operational amplifier U8, the other end of the resistor R38 is grounded, the E terminal of the transistor U9 is grounded, the negative terminal of the indicator light D2 is connected to the C terminal of the transistor U9, the positive terminal of the indicator light D2 is connected to +5V, the third pin and the fifth pin of the operational amplifier U8 are respectively connected to +5V, the second pin of the operational amplifier U8 is grounded, and the fourth pin of the operational amplifier U8 is connected to the junction of the inductor L2 and the resistor R19.

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