Optical fiber transceiver, pulse signal transceiver system and method

Abstract

The present invention provides a fiber optic transceiver, a pulse signal transceiver system and method, wherein the fiber optic transceiver includes: an optical transmitter and an optical receiver; the optical transmitter is connected to a transmitting terminal device; the optical transmitter is connected to the optical receiver via an optical fiber line; the optical transmitter is used to perform "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and perform electrical-to-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal; the optical receiver is connected to a receiving terminal device; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal device. The optical transmitter of the present invention performs "dark pulse" modulation on the time-frequency electrical signal sent by the transmitting terminal device, and has the advantages of being resistant to changes in optical fiber line attenuation, stable transmission delay, and low cost.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber transmission technology, and in particular to an optical fiber transceiver, a pulse signal transceiver system and a method. Background Art

[0002] Many large-scale measurement networks require pulsed time-frequency equipment for time synchronization. A central device sends time synchronization pulses or measurement start pulses to other end devices, typically using a pulse-per-second signal (PPS). These signals have an extremely low duty cycle. In some cases, a pulse signal with a width of tens of nanoseconds is transmitted within a one-second interval, with a duty cycle as low as 10E-7. When using optical fiber as the transmission medium for pulsed time-frequency signals, fiber lengths range from several meters to tens of kilometers. Due to various environmental factors, signal transmission delays vary. To address this issue, current approaches use in-line reverse feedback to automatically compensate for fiber line transmission delays, ensuring stable time-synchronization pulse signal delays during fiber transmission. While this solution is suitable for long fiber lengths, it becomes overly complex and costly for close equipment distances, with fiber lengths of several kilometers or even tens of meters. Summary of the Invention

[0003] The purpose of the present invention is to provide an optical fiber transceiver, a pulse signal transceiver system and method, which have the advantages of being resistant to optical fiber line attenuation changes, having stable transmission delay and low cost.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] An optical fiber transceiver, comprising:

[0006] Optical transmitters and optical receivers;

[0007] The optical transmitter is connected to the transmitting terminal device; the optical transmitter is connected to the optical receiver via an optical fiber line; the optical transmitter is used to perform "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and perform electrical-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;

[0008] The optical receiver is connected to the receiving terminal device; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain the transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal device.

[0009] Optionally, the optical transmitter specifically includes:

[0010] a pulse signal shaping circuit, a laser current driver, a laser, an automatic power controller, and a first photodetector;

[0011] The input end of the pulse signal shaping circuit is connected to the transmitting terminal device; the pulse signal shaping circuit, the laser current driver and the laser are connected in sequence; the output end of the laser is connected to one end of the optical fiber line;

[0012] The first photodetector is connected to the automatic power controller; the first photodetector is used to detect the backlight signal of the laser;

[0013] The automatic power controller is used to amplify the backlight signal and control the current drive of the laser according to the amplified backlight signal, thereby forming a closed-loop control of automatic optical power.

[0014] Optionally, the optical receiver specifically includes:

[0015] a second photodetector, a preamplifier, a comparison amplifier, and a DC signal voltage divider circuit;

[0016] The input end of the preamplifier is connected to the other end of the optical fiber line; the second photodetector, the preamplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected to the receiving terminal device;

[0017] The input end of the DC signal voltage divider circuit is connected to the output end of the preamplifier; the output end of the DC signal voltage divider circuit is connected to the comparison threshold input end of the comparison amplifier;

[0018] The DC signal voltage divider circuit is used to perform voltage division processing on the DC component of the output signal of the preamplifier, and input the DC component after voltage division processing into the comparison amplifier as the comparison threshold voltage of the comparison amplifier.

[0019] Optionally, the optical receiver further includes:

[0020] filter circuit;

[0021] The input end of the filter circuit is connected to the output end of the preamplifier;

[0022] The output end of the filter circuit is connected to the input end of the DC signal voltage divider circuit.

[0023] A pulse signal transceiver system, comprising:

[0024] Transmitting terminal equipment, a plurality of the above-mentioned optical fiber transceivers, and a plurality of receiving terminal equipment;

[0025] The transmitting terminal equipment is connected to the plurality of optical fiber transceivers respectively; the plurality of optical fiber transceivers are connected to the plurality of receiving terminal equipment respectively in a one-to-one correspondence.

[0026] A method for transmitting and receiving a pulse signal, the method being applied to the above-mentioned optical fiber transceiver, the method comprising:

[0027] The optical transmitter performs "dark pulse" modulation on the pulse time-frequency electrical signal sent by the terminal device, and performs electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;

[0028] The optical fiber line transmits the pulse time-frequency optical signal;

[0029] The optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain the transmitted pulse time-frequency electrical signal;

[0030] The receiving terminal device receives the transmitted pulse time-frequency electrical signal.

[0031] Optionally, the optical transmitter performs “dark pulse” modulation on the pulse time-frequency electrical signal sent by the sending terminal device, and performs electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal, specifically including:

[0032] Performing “dark pulse” modulation on the pulse time-frequency electrical signal sent by the sending terminal device;

[0033] A first photodetector detects a backlight signal at the laser;

[0034] The automatic power controller amplifies the backlight signal and controls the current drive of the laser according to the amplified backlight signal, so that the pulse amplitude of the pulse time-frequency optical signal output by the laser is maintained within a preset pulse amplitude range.

[0035] Optionally, the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain the transmitted pulse time-frequency electrical signal, specifically including:

[0036] Acquiring a DC component of the pulsed time-frequency optical signal after transmission through the optical fiber line;

[0037] The DC signal voltage divider circuit performs voltage division processing on the DC component;

[0038] inputting the DC component after voltage division into the comparison amplifier as the comparison threshold voltage of the comparison amplifier;

[0039] The comparison amplifier determines the transmitted pulse time-frequency electrical signal based on the comparison threshold voltage; the ratio of the amplitude level of the transmitted pulse time-frequency electrical signal to the amplitude level of the comparison threshold voltage is within a preset ratio range.

[0040] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0041] The present invention provides a fiber optic transceiver, a pulse signal transceiver system and method, wherein the fiber optic transceiver includes: an optical transmitter and an optical receiver; the optical transmitter is connected to a transmitting terminal device; the optical transmitter is connected to the optical receiver via an optical fiber line; the optical transmitter is used to perform "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and perform electrical-to-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal; the optical receiver is connected to a receiving terminal device; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal device. The optical transmitter of the present invention performs "dark pulse" modulation on the time-frequency electrical signal sent by the transmitting terminal device, and has the advantages of being resistant to changes in optical fiber line attenuation, stable transmission delay, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0043] Figure 1 This is a schematic diagram of the structure of an optical fiber transceiver that modulates pulse signals using a "bright pulse" technique in the prior art;

[0044] Figure 2 This is a schematic diagram of the change in the amplitude of the pulse signal output by the optical fiber transceiver of the "bright pulse" modulated pulse signal in the prior art when the optical fiber attenuation changes;

[0045] Figure 3 This is a schematic diagram of the change in the pulse signal amplitude output by the optical fiber transceiver of the "bright pulse" modulated pulse signal in the prior art when the optical fiber attenuation increases by 5dB;

[0046] Figure 4 Schematic diagram of the structure of an optical fiber transceiver for a "dark pulse" modulated pulse signal according to an embodiment of the present invention;

[0047] Figure 5Schematic diagram of the change in the amplitude of the pulse signal output by the optical fiber transceiver of the "dark pulse" modulated pulse signal when the optical fiber attenuation changes in an embodiment of the present invention;

[0048] Figure 6 Schematic diagram of the change in pulse signal amplitude output by a fiber optic transceiver that uses a “dark pulse” modulated pulse signal in an embodiment of the present invention when the fiber attenuation increases by 5 dB;

[0049] Figure 7 This is a flow chart of a pulse signal receiving and transmitting method according to an embodiment of the present invention;

[0050] Description of the drawings: 1- pulse signal shaping circuit; 2- laser current driver; 3- laser; 4- automatic power controller; 5- first photodetector; 6- second photodetector; 7- preamplifier; 8- comparison amplifier; 9- DC signal voltage divider circuit. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] The purpose of the present invention is to provide an optical fiber transceiver, a pulse signal transceiver system and method, which have the advantages of being resistant to optical fiber line attenuation changes, having stable transmission delay and low cost.

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Figure 4 FIG. 1 is a schematic diagram of the structure of an optical fiber transceiver for modulating pulse signals using a “dark pulse” in an embodiment of the present invention. Figure 4 The present invention provides a fiber optic transceiver, comprising:

[0055] Optical transmitters and optical receivers;

[0056] The optical transmitter is connected to the transmitting terminal device; the optical transmitter is connected to the optical receiver via an optical fiber line; the optical transmitter is used to perform "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and perform electrical-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;

[0057] The optical receiver is connected to the receiving terminal device; the optical receiver converts the pulse time-frequency optical signal transmitted through the optical fiber line into a photoelectric conversion to obtain the transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal device.

[0058] Specifically, the optical transmitter includes:

[0059] Pulse signal shaping circuit 1, laser current driver 2, laser 3, automatic power controller 4 and first photodetector 5;

[0060] The input end of the pulse signal shaping circuit is connected to the transmitting terminal device; the pulse signal shaping circuit, the laser current driver and the laser are connected in sequence; the output end of the laser is connected to one end of the optical fiber line;

[0061] The first photodetector is connected to the automatic power controller; the first photodetector is used to detect the backlight signal of the laser;

[0062] The automatic power controller is used to amplify the backlight signal and control the current drive of the laser according to the amplified backlight signal, thereby forming a closed-loop control of the automatic optical power.

[0063] Specifically, the optical receiver includes:

[0064] a second photodetector 6, a preamplifier 7, a comparison amplifier 8 and a DC signal voltage divider circuit 9;

[0065] The input end of the preamplifier is connected to the other end of the optical fiber line; the second photodetector, the preamplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected to the receiving terminal device;

[0066] The input end of the DC signal voltage divider circuit is connected to the output end of the preamplifier; the output end of the DC signal voltage divider circuit is connected to the comparison threshold input end of the comparison amplifier;

[0067] The DC signal voltage divider circuit is used for performing voltage division processing on the DC component of the output signal of the preamplifier, and inputting the DC component after voltage division processing into the comparison amplifier as the comparison threshold voltage of the comparison amplifier.

[0068] In addition, the optical receiver also includes:

[0069] Filter circuit (not shown);

[0070] The input end of the filter circuit is connected to the output end of the preamplifier;

[0071] The output end of the filter circuit is connected to the input end of the DC signal voltage divider circuit.

[0072] like Figure 1 As shown in Figure 1, current pulse fiber transceiver technology consists of two parts: an optical transmitter consisting of a pulse signal shaping circuit and a laser current drive circuit; and an optical receiver consisting of a preamplifier and a comparator amplifier. The optical transmitter performs electrical-to-optical conversion, while the optical receiver performs optical-to-electrical conversion and pulse regeneration.

[0073] Current fiber optic transceiver technology uses a "bright pulse" optical signal modulation method, meaning that when a pulse appears, it corresponds to a "1" logic signal and a "high optical power level"; when a pulse does not appear, it corresponds to a "0" logic signal and corresponds to "no optical power level or an extremely low optical power level." In an optical transmitter, when a pulse signal—a "1" signal—appears at the input, the pulse signal shaping circuit generates a "1" signal, causing the laser current drive circuit to generate current to drive the laser, generating an optical pulse signal corresponding to the pulse signal. When no pulse signal—a "0" signal—appears at the input, the pulse signal shaping circuit generates a "0" signal, causing the laser current drive circuit to output no current to drive the laser, resulting in no laser light and a zero or extremely low optical power level.

[0074] The optical pulse light signal is transmitted through the optical fiber to the photodetector in the optical receiver to complete the optical-electrical conversion, is converted into a photocurrent, and is amplified by the preamplifier to obtain a pulse signal V p It is regenerated by the comparison amplifier circuit and finally a regenerated pulse output is obtained.

[0075] In the above process, when the optical pulse signal is modulated using the "bright pulse" method, when the pulse duty cycle is low, it is difficult to detect the pulse amplitude level in the output optical signal in the optical transmitter to implement automatic optical power control. In the optical receiver, it is not easy to implement automatic gain control to control the pulse amplitude stability, nor is it easy to detect the pulse amplitude level well to automatically adjust the comparison threshold level of the comparison amplifier. Therefore, when performing pulse regeneration, the comparison amplifier can only use a fixed comparison threshold level for comparison amplification to regenerate the pulse signal, such as Figure 2 and Figure 3 shown.

[0076] exist Figure 2 In the example, the comparison threshold level V th The value is a fixed value, such as the pulse signal V p When the fiber attenuation changes, the amplitude of the pulse signal output by the preamplifier changes accordingly, such as Figure 3 In this example, when the fiber attenuation increases by 5dB, the pulse signal amplitude changes from V p Descending to V' p , V' p =V p / 3. Since the comparison threshold level V thIf the comparator amplifier is a fixed value, the rising edge position of the regenerated pulse signal obtained by the comparator amplifier will vary by Δt. The magnitude of Δt is related to the change in the pulse signal amplitude and the pulse signal's rising edge rate. When the pulse signal amplitude change is large, such as 10dB, and the pulse signal's rising edge rate is low, such as 1ns, in the above example, Δt can reach over 600ps. In some applications, transmission delay variations of hundreds of ps exceed the tolerance.

[0077] like Figure 4 The optical fiber pulse transceiver circuit device of the present invention includes two parts: an optical transmitter and an optical receiver. The optical transmitter performs electrical-to-optical conversion, while the optical receiver performs optical-to-electrical conversion and pulse regeneration.

[0078] The optical transmitter includes: pulse signal shaping, laser current driving, automatic power control, laser and a first photodetector; the pulse signal shaping, laser current driving and laser are connected in sequence, the first photodetector detects the backlight signal of the laser, and after amplification by the automatic power control circuit, controls the laser current driving circuit to form an automatic optical power closed-loop control to stabilize the output optical power.

[0079] The optical receiver includes: a second photodetector, a preamplifier, a comparator amplifier, and a DC signal voltage divider; the second photodetector, the preamplifier, and the comparator amplifier are connected in sequence, and the DC signal voltage divider circuit filters the output signal of the preamplifier to obtain a DC component of the signal, which is then connected to an input terminal of the comparator amplifier after resistor voltage division as the comparison threshold voltage of the comparator amplifier.

[0080] The device of the present invention uses a "dark pulse" optical signal modulation method. The presence of a pulse signal corresponds to a "1" logic signal, corresponding to "no optical power level or an extremely low optical power level." The absence of a pulse signal corresponds to a "0" logic signal, corresponding to a "high optical power level." When a pulse signal—a "1" signal—appears at the input end, the pulse signal shaping circuit generates a "1" signal, and the laser current drive circuit generates no current to drive the laser. The laser does not emit light or only emits very low-power light, and the output optical power is 0 or an extremely low optical power level. When no pulse signal—a "0" signal—appears at the input end, the pulse signal shaping circuit generates a "0" signal, and the laser current drive circuit outputs current to drive the laser to emit light, resulting in a high optical power level.

[0081] When using the "dark pulse" optical signal modulation method, the pulse duty cycle is very low, less than 10E-3. At the optical transmitter end, the optical signal output is a high-power, near-DC signal for most of the time. When a pulse signal is present, the output optical power of the transmitter is lower, such as less than -30dBm. This makes it easy to construct an automatic optical power control circuit using a reverse optical DC signal amplification circuit, maintaining the average optical power level of the transmitter output at a stable value, such as 0dBm. The amplitude level of the optical pulse signal is then approximately equal to the average optical power level. Since the amplitude level of the optical pulse is approximately equal to the average optical output power of the laser, stabilizing the average optical output power of the transmitter can stabilize the amplitude of the pulse signal in the optical signal.

[0082] After adopting the "dark pulse" optical signal modulation method, in an embodiment, a preamplifier in an optical receiver simultaneously amplifies the DC signal and pulse signal contained in the optical signal. The pulse signal level is approximately equal to the DC signal level. The amplitude level of the pulse signal is obtained by detecting the DC level of the received optical signal. A DC signal voltage divider circuit filters the output signal of the preamplifier to obtain the DC component of the signal. After resistor voltage division, it is sent to one input terminal of the comparator amplifier as the comparison threshold voltage of the comparator amplifier. The output signal of the preamplifier is also sent to the other input terminal of the comparator amplifier. When the comparator amplifier regenerates the pulse signal, the DC level of the obtained signal is used to automatically adjust the comparison threshold level of the comparator amplifier. The comparison threshold level circuit of the comparator amplifier automatically tracks the changes in the amplitude level of the pulse signal, so that the ratio of the amplitude level of the pulse signal to the comparison threshold level remains almost unchanged. The rising edge time position of the regenerated pulse signal regenerated by the comparator amplifier does not change with changes in the input pulse signal level, greatly reducing the impact of the pulse signal amplitude level changes on the transmission delay. Even when using devices with lower speed and smaller bandwidth, the transmission delay can be ensured to be almost unchanged due to changes in optical fiber line loss.

[0083] like Figure 5 and Figure 6 As shown, the comparison threshold level V th The value is the pulse signal V p When the fiber attenuation changes, the pulse signal level output by the preamplifier changes accordingly. When the fiber attenuation increases by 5dB, the pulse signal level changes from V p Descending to V' p , V' p =V p / 3, since the DC level of the signal is also reduced to 1 / 3 of the original, the comparison threshold level V' thalso drops to 1 / 3 of its original value, so V 'th / V' p =1 / 2, the ratio of the amplitude level of the pulse signal to the comparison threshold level remains unchanged, and the rising edge time position of the regenerated pulse signal obtained by the comparison amplifier remains unchanged.

[0084] In addition, the present invention also provides a pulse signal transceiver system, comprising:

[0085] Transmitting terminal equipment, a plurality of the above-mentioned optical fiber transceivers, and a plurality of receiving terminal equipment;

[0086] The transmitting terminal devices are respectively connected to the multiple optical fiber transceivers; and the multiple optical fiber transceivers are respectively connected to the multiple receiving terminal devices in a one-to-one correspondence.

[0087] In addition, if Figure 7 The present invention also provides a method for transmitting and receiving a pulse signal, which is applied to the above-mentioned optical fiber transceiver, and the method includes:

[0088] Step 701: The optical transmitter performs “dark pulse” modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and performs electrical-to-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;

[0089] Step 702: Transmitting a pulsed time-frequency optical signal via an optical fiber line;

[0090] Step 703: The optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain a transmitted pulse time-frequency electrical signal;

[0091] Step 704: The receiving terminal device receives the transmitted pulse time-frequency electrical signal.

[0092] Step 701 specifically includes:

[0093] Performing “dark pulse” modulation on the pulse time-frequency electrical signal sent by the sending terminal device;

[0094] A first photodetector detects a backlight signal at the laser;

[0095] The automatic power controller amplifies the backlight signal and controls the current drive of the laser according to the amplified backlight signal, so that the pulse amplitude of the pulse time-frequency optical signal output by the laser is maintained within a preset pulse amplitude range.

[0096] Step 703 specifically includes:

[0097] Obtaining the DC component of the pulsed time-frequency optical signal after transmission through the optical fiber line;

[0098] The DC signal voltage divider circuit performs voltage division processing on the DC component;

[0099] The DC component after voltage division is input into the comparison amplifier as the comparison threshold voltage of the comparison amplifier;

[0100] The comparison amplifier determines the transmitted pulse time-frequency electrical signal according to the comparison threshold voltage; the ratio of the amplitude level of the transmitted pulse time-frequency electrical signal to the amplitude level of the comparison threshold voltage is within a preset ratio range.

[0101] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0102] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A fiber optic transceiver, characterized in that: The optical fiber transceiver comprises: Optical transmitters and optical receivers; The optical transmitter is connected to the transmitting terminal device; the optical transmitter is connected to the optical receiver via an optical fiber line; the optical transmitter is used to perform "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and perform electrical-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal; The optical receiver is connected to a receiving terminal device; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal device; The optical transmitter specifically includes: a pulse signal shaping circuit, a laser current driver, a laser, an automatic power controller, and a first photodetector; The input end of the pulse signal shaping circuit is connected to the transmitting terminal device; the pulse signal shaping circuit, the laser current driver and the laser are connected in sequence; the output end of the laser is connected to one end of the optical fiber line; The first photodetector is connected to the automatic power controller; the first photodetector is used to detect the backlight signal of the laser; The automatic power controller is used to amplify the backlight signal and control the current drive of the laser according to the amplified backlight signal to form a closed-loop control of automatic optical power; The optical receiver specifically includes: a second photodetector, a preamplifier, a comparison amplifier, a filter circuit, and a DC signal voltage divider circuit; The input end of the second photodetector is connected to the other end of the optical fiber line; the second photodetector, the preamplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected to the receiving terminal device; The input end of the DC signal voltage divider circuit is connected to the output end of the preamplifier; the output end of the DC signal voltage divider circuit is connected to the comparison threshold input end of the comparison amplifier; The DC signal voltage divider circuit is used to perform voltage division processing on the DC component of the output signal of the preamplifier, and input the DC component after voltage division processing into the comparison amplifier as the comparison threshold voltage of the comparison amplifier; The input end of the filter circuit is connected to the output end of the preamplifier; The output end of the filter circuit is connected to the input end of the DC signal voltage divider circuit.

2. A pulse signal transceiver system, characterized in that: The system comprises: A transmitting terminal device, a plurality of optical fiber transceivers as claimed in claim 1, and a plurality of receiving terminal devices; The transmitting terminal equipment is connected to the plurality of optical fiber transceivers respectively; the plurality of optical fiber transceivers are connected to the plurality of receiving terminal equipment respectively in a one-to-one correspondence.

3. A pulse signal receiving and transmitting method, characterized in that: The method is applied to the optical fiber transceiver according to claim 1, and the method comprises: The optical transmitter modulates the pulse time-frequency electrical signal sent by the transmitting terminal device with a "dark pulse" and performs electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal; The optical fiber line transmits the pulse time-frequency optical signal; The optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain the transmitted pulse time-frequency electrical signal; The receiving terminal device receives the transmitted pulse time-frequency electrical signal.

4. The pulse signal transmitting and receiving method according to claim 3, wherein: The optical transmitter performs "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device, and performs electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal, specifically including: Perform "dark pulse" modulation on the pulse time-frequency electrical signal sent by the transmitting terminal device; A first photodetector detects a backlight signal at the laser; The automatic power controller amplifies the backlight signal and controls the current drive of the laser according to the amplified backlight signal, so that the pulse amplitude of the pulse time-frequency optical signal output by the laser is maintained within a preset pulse amplitude range.

5. The pulse signal transmitting and receiving method according to claim 4, wherein: The optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted through the optical fiber line to obtain the transmitted pulse time-frequency electrical signal, specifically including: Acquiring a DC component of the pulsed time-frequency optical signal after transmission through the optical fiber line; The DC signal voltage divider circuit performs voltage division processing on the DC component; inputting the DC component after voltage division processing into the comparison amplifier as the comparison threshold voltage of the comparison amplifier; The comparison amplifier determines the transmitted pulse time-frequency electrical signal according to the comparison threshold voltage; The ratio of the amplitude level of the transmitted pulse time-frequency electrical signal to the amplitude level of the comparison threshold voltage is within a preset ratio range.

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