Optical communication system and optical communication method thereof

Abstract

The present invention belongs to the field of optical fiber communication technology, and its purpose is to provide an optical communication system and an optical communication method thereof. The optical communication system in the present invention includes a main control unit, an optical component driving unit, an optical transmitting component, a first optical receiving component, a second optical receiving component, an optical module and an analog-to-digital conversion unit; the main control unit is connected to the input end of the optical transmitting component and the output end of the first optical receiving component respectively through the optical component driving unit, the output end of the optical transmitting component, the input end of the first optical receiving component and the input end of the second optical receiving component are all connected to the optical module, and the output end of the second optical receiving component is connected to the main control unit through the analog-to-digital conversion unit. The present invention can realize optical communication safety status monitoring, which is conducive to improving the safety of optical communication.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber communication, and in particular relates to an optical communication system and an optical communication method thereof. Background Art

[0002] Compared with wireless communication, optical fiber communication has significant advantages in confidentiality. This is because the electromagnetic waves in optical fiber communication are completely confined in the optical fiber core for propagation, and almost no external leakage occurs, making it difficult for the outside world to intercept or decode the information being transmitted in the optical fiber by detecting the electromagnetic waves around the optical fiber. With the development of information technology, optical fiber communication has been widely used in various communication scenarios due to its advantages such as long-distance transmission capability, high reliability and stability, and has become an important means of data transmission. Optical transceiver modules have been widely used as information loading and receiving devices.

[0003] In the prior art, a Chinese patent application with publication number CN114815087A discloses an optical transceiver module and an optical transceiver, and proposes an optical transceiver module with an easily repairable control circuit for controlling a photoelectric conversion circuit. A Chinese patent application with publication number CN115189760A discloses an optical module monitoring method, system and device, and realizes flexible monitoring of the optical module by writing pre-set enable information into the target optical module, and the enable information can enable the target optical module to output the monitored status information of the target optical module through the target pin, so that the network device can capture the current status of the target optical module in real time, thereby improving the accuracy of optical module monitoring.

[0004] In the actual application of optical communication technology, the inventors found that attackers may destroy the total reflection mechanism of light inside the optical fiber, causing the optical signal to leak, thereby obtaining the data bits in transmission and interpreting the transmission information. What is more serious is that attackers can even inject illegal optical signals into the optical fiber to interfere with or even replace the original legal optical signals, thereby covering and tampering with the information. The above-mentioned existing technologies are unable to monitor the optical communication security status of the optical transceiver module, and it is difficult to ensure the security of optical communication. Summary of the invention

[0005] The present invention aims to solve the above technical problems at least to a certain extent, and provides an optical communication system and an optical communication method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an optical transceiver system, comprising a main control unit, an optical component driving unit, an optical transmitting component, a first optical receiving component, a second optical receiving component, an optical module and an analog-to-digital conversion unit; the main control unit is connected to the input end of the optical transmitting component and the output end of the first optical receiving component respectively through the optical component driving unit, the output end of the optical transmitting component, the input end of the first optical receiving component and the input end of the second optical receiving component are all connected to the optical module, and the output end of the second optical receiving component is connected to the main control unit through the analog-to-digital conversion unit;

[0008] The optical emitting component is used to output the emitted light under the drive of the optical component driving unit, and output the emitted light to another optical communication system through the optical module, and the emitted light output by the optical emitting component includes pulse light and direct current light; correspondingly, the first optical receiving component is used to receive the pulse light transmitted by the other optical communication system through the optical module, and perform photoelectric conversion processing on it to obtain a first electrical signal, and then transmit the first electrical signal to the main control unit through the optical component driving unit, so that the main control unit parses and obtains the communication information corresponding to the first electrical signal; the second optical receiving component is used to receive the direct current light transmitted by the other optical communication system through the optical module, and perform photoelectric conversion processing on it to obtain a second electrical signal, and then transmit the second electrical signal to the main control unit through the analog-to-digital conversion unit, so that the main control unit obtains the sensor signal corresponding to the second electrical signal, and monitors the optical communication safety status based on the sensor signal.

[0009] In one possible design, the optical component driving unit includes a digital signal processor, an amplifier and a modulator, the digital signal processor is connected to the main control unit, the amplifier and the modulator respectively, the amplifier is connected to the output end of the first optical receiving component, and the modulator is connected to the input end of the optical transmitting component.

[0010] In one possible design, the modulator is a lithium niobate MZ optical intensity modulator.

[0011] In one possible design, the optical module includes a wavelength division multiplexer, a 2*2 optical fiber coupler and a 1*2 optical fiber coupler, the input end of the wavelength division multiplexer is connected to the output end of the optical transmitting component, the output end of the wavelength division multiplexer is connected to the first input end of the 2*2 optical fiber coupler, the first output end of the 2*2 optical fiber coupler serves as the transmitting end of the optical communication system, the input end of the 1*2 optical fiber coupler serves as the receiving end of the optical communication system, the first output end of the 1*2 optical fiber coupler is connected to the input end of the first optical receiving component, the second output end of the 1*2 optical fiber coupler is connected to the second input end of the 2*2 optical fiber coupler, and the second output end of the 2*2 optical fiber coupler is connected to the input end of the second optical receiving component.

[0012] In a possible design, the optical emission component includes a laser driver and a laser connected in sequence, the input end of the laser driver is the input end of the optical emission component, and the output end of the laser is the output end of the optical emission component; the laser is a DFB laser.

[0013] In a possible design, the first light receiving component and the second light receiving component both include a photodetector and a photoelectric conversion unit connected in sequence along the transmission direction of light, and the response frequency of the photoelectric conversion unit in the second light receiving component is not less than 10 GHz.

[0014] In a second aspect, the present invention provides an optical communication method of an optical communication system as described in any one of the above, comprising:

[0015] The main control unit sends a specified digital signal to the optical component driving unit, so that the optical component driving unit performs signal modulation processing on the specified digital signal to obtain a modulated signal, and transmits the modulated signal to the optical emission component, so that the optical emission component outputs emission light, and then transmits the emission light to another optical communication system through the optical module; wherein the emission light output by the optical emission component includes pulse light and direct current light;

[0016] The first optical receiving component receives the pulse light transmitted by the other optical communication system through the optical module, performs photoelectric conversion processing on the pulse light to obtain a first electrical signal, and then transmits the first electrical signal to the main control unit through the optical component driving unit, so that the main control unit parses and obtains communication information corresponding to the first electrical signal;

[0017] The second light receiving component receives the DC light transmitted by the other optical communication system through the optical module, and performs photoelectric conversion on it to obtain a second electrical signal, and then transmits the second electrical signal to the main control unit through the analog-to-digital conversion unit, so that the main control unit obtains a sensor signal corresponding to the second electrical signal, and monitors the optical communication safety status based on the sensor signal.

[0018] In one possible design, optical communication safety status monitoring is performed based on the sensing signal, including:

[0019] The main control unit determines whether a threat event occurs according to the sensor signal, and if so, proceeds to the next step;

[0020] The main control unit obtains the time when the first threat event occurs, generates alarm information based on the time when the first threat event occurs, and then communicates the alarm information to the other optical communication system to obtain the time when the second threat event occurs obtained by the other optical communication system;

[0021] The main control unit obtains the optical cable distance at which the threat event occurs according to the first threat event occurrence time and the second threat event occurrence time.

[0022] In a possible design, the optical cable distance at which the threat event occurs is:

[0023] ;

[0024] In the formula, L is the preset total length of the communication optical cable, n is the refractive index of the fiber of the preset communication optical cable, T A is the time when the first threat event occurs, T B is the time when the second threat event occurs, c The speed of light.

[0025] In a possible design, after the main control unit determines that a threat event occurs according to the sensor signal, the method further includes:

[0026] The main control unit obtains the light intensity time domain data of the DC light received by the second light receiving component, and obtains the threat event type according to the light intensity time domain information; wherein the light intensity time domain data is:

[0027] ;

[0028] In the formula, E is the amplitude of the DC light received by the second light receiving component, For tThe optical phase difference caused by the momentary threat event, is the initial phase difference of the optical module.

[0029] The beneficial effects of the present invention are:

[0030] The present invention discloses an optical communication system and an optical communication method thereof, which can realize optical communication security status monitoring and help improve the security of optical communication. Specifically, the present invention improves the internal structure of the optical communication system, and sets a main control unit, an optical transmitting component that can emit pulse light and direct current light, a first optical receiving component that can receive pulse light transmitted by another optical communication system, and a second optical receiving component that can receive direct current light transmitted by another optical communication system. During the implementation process, the main control unit can parse and obtain communication information corresponding to the first electrical signal and a sensor signal corresponding to the second electrical signal, and perform optical communication security status monitoring based on the sensor signal. Based on this, the present invention can realize the security status monitoring of illegal intrusion behaviors such as external cutting, stripping and bending in the optical modules and transmission optical fibers of the communicating parties on the basis of normal optical communication, which can help to timely discover threat events in the optical communication process so as to take corresponding protective measures for optical fiber communication, thereby ensuring the security of optical communication.

[0031] Other beneficial effects of the present invention will be further described in the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a module block diagram of the optical communication system in Example 1;

[0033] Figure 2 is a module block diagram of the optical module in Example 1;

[0034] Figure 3 is a schematic diagram of a first form of communication between two optical communication systems exemplified in Embodiment 1;

[0035] Figure 4 is a schematic diagram of a second form of communication between two optical communication systems exemplified in Embodiment 1;

[0036] Figure 5 This is a schematic diagram of the third form of communication between the two optical communication systems illustrated in Example 1. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0038] Embodiment 1:

[0039] This embodiment discloses an optical communication system, such as Figure 1 As shown, it includes a main control unit, an optical component driving unit, an optical transmitting component, a first optical receiving component, a second optical receiving component, an optical module and an analog-to-digital conversion unit; the main control unit is connected to the input end of the optical transmitting component and the output end of the first optical receiving component respectively through the optical component driving unit, the output end of the optical transmitting component, the input end of the first optical receiving component and the input end of the second optical receiving component are all connected to the optical module, and the output end of the second optical receiving component is connected to the main control unit through the analog-to-digital conversion unit;

[0040] The optical transmitting component is used to output the transmitted light under the drive of the optical component driving unit, and output the transmitted light to another optical communication system through the optical module, and the transmitted light output by the optical transmitting component includes pulse light and direct current light; correspondingly, the first optical receiving component is used to receive the pulse light transmitted by the other optical communication system through the optical module, and perform photoelectric conversion processing on it to obtain a first electrical signal, and then transmit the first electrical signal to the main control unit through the optical component driving unit, so that the main control unit parses and obtains the communication information corresponding to the first electrical signal; the second optical receiving component is used to receive the direct current light transmitted by the other optical communication system through the optical module, and perform photoelectric conversion processing on it to obtain a second electrical signal, and then transmit the second electrical signal to the main control unit through the analog-to-digital conversion unit, so that the main control unit obtains the sensor signal corresponding to the second electrical signal, and performs optical communication security status monitoring based on the sensor signal. Specifically, in this embodiment, the main control unit can judge and warn of threat events based on the sensor signal to realize the optical fiber optical communication security status monitoring function.

[0041] During the implementation of this embodiment, when an illegal person contacts the optical communication system in this embodiment or the communication optical cable used to connect the communicating parties, the threat event can be identified through the sensing signal, and the phase difference information reflecting the physical parameters of the threat event can be restored through the optical fiber phase change information in the sensing signal to obtain the specific type of the threat event.

[0042] It should be noted that, in the present embodiment, the emission light output by the optical transmitting component includes pulse light and direct current light. The pulse light carries the communication information to be transmitted, and the direct current light carries the optical fiber vibration and strain signals. The two differ in bandwidth response. The pulse light and direct current light respectively assume the carrier functions of data transmission and security monitoring. The purpose is to achieve communication with another optical communication system. At the same time, the security status of the data transmission carrier can be restored through the original carrier.

[0043] In this embodiment, the optical component driving unit includes a digital signal processor, an amplifier and a modulator. The digital signal processor is connected to the main control unit, the amplifier and the modulator respectively. The amplifier is connected to the output end of the first optical receiving component, and the modulator is connected to the input end of the optical transmitting component. Specifically, in this embodiment, the modulator is used to modulate the electrical signal sent by the digital signal processor to realize the conversion of "0" and "1" electrical signals and pulse signals, and then transmit the modulated pulse signal to the optical transmitting component; the amplifier adopts TIA (Trans-impedance amplifier) / LA (Limiting Amplifier), which is used to amplify the first electrical signal after the first optical receiving component converts the optical signal received by it into a first electrical signal to obtain a first amplified electrical signal; the digital signal processor can receive the first amplified electrical signal, and identify the "0" and "1" signals, and then transmit the communication signal corresponding to the first electrical signal to the main control unit, so that the main control unit can parse the communication signal to obtain the communication information, and upload the data to the upper computer through the preset communication interface; it should also be understood that the digital signal processor has a built-in clock recovery circuit to realize functions such as clock recovery and signal loss compensation.

[0044] It should be understood that, in this embodiment, the optical component driving unit also includes a power supply unit for providing power support to devices such as the digital signal processor, the amplifier, and the modulator.

[0045] In this embodiment, the modulator adopts a lithium niobate MZ (Mach-Zehnder) optical intensity modulator. It should be noted that the lithium niobate MZ optical intensity modulator can support very high modulation rates, which can reach tens of Gbps or even higher, and is suitable for modern high-speed data transmission needs. At the same time, due to the excellent electro-optical effect of lithium niobate materials, this type of modulator can operate at a lower driving voltage, thereby reducing insertion loss and improving the overall efficiency and performance of the system. In addition, this type of modulator also has technical advantages such as good linearity and thermal stability, which can provide efficient, reliable, flexible and high-performance solutions for optical communication systems, especially suitable for high-speed and long-distance data transmission applications.

[0046] In this embodiment, Figure 2 As shown, the optical module includes a wavelength division multiplexer (WDM), a 2*2 fiber coupler and a 1*2 fiber coupler, the input end of the wavelength division multiplexer is connected to the output end of the optical transmitting component, the output end of the wavelength division multiplexer is connected to the first input end of the 2*2 fiber coupler, the first output end of the 2*2 fiber coupler serves as the transmitting end of the optical communication system, the input end of the 1*2 fiber coupler serves as the receiving end of the optical communication system, the first output end of the 1*2 fiber coupler is connected to the input end of the first optical receiving component, the second output end of the 1*2 fiber coupler is connected to the second input end of the 2*2 fiber coupler, and the second output end of the 2*2 fiber coupler is connected to the input end of the second optical receiving component. It should be noted that, in the present embodiment, the input end of the wavelength division multiplexer, the second output end of the 2*2 optical fiber coupler and the first output end of the 1*2 optical fiber coupler constitute an optical signal processing optical interface to realize the connection with the output end of the optical transmitting component, the input end of the second optical receiving component and the input end of the first optical receiving component; the first output end of the 2*2 optical fiber coupler and the input end of the 1*2 optical fiber coupler constitute an optical signal transmission optical interface to realize the optical fiber communication connection with other optical communication systems.

[0047] In the optical module of the present embodiment, the first output end of the 1*2 optical fiber coupler transmits pulse light to the first optical receiving component so as to realize communication information analysis between the optical communication system and another optical communication system in the present embodiment; the DC light transmitted by the optical module to the second optical receiving component is the DC interference light obtained by superimposing two coherent light waves at the 2*2 optical fiber coupler, and its intensity change reflects the phase change of the light wave in the communication optical fiber, and the amplitude, frequency and duration of the phase change correspond to different threat events. The main control unit can realize the judgment of the type of threat event and issue an early warning when a threat event occurs.

[0048] In this embodiment, the 1*2 optical fiber coupler can divide the initial light received from the other optical communication system into multiple beams, and transmit one of the beams as signal light (i.e., pulse light) to the first light receiving component, and transmit one beam as reference light to the second input end of the 2*2 optical fiber coupler, and then enter the second light receiving component after the 2*2 optical fiber coupler. Since the light source has a certain coherence length and the difference in equivalent lengths of the two optical fibers in the same optical cable is within the coherence length of the light source, the second light receiving component can obtain DC light carrying phase information.

[0049] In this embodiment, the optical transmission component includes a laser driver and a laser connected in sequence, the input end of the laser driver is the input end of the optical transmission component, and the output end of the laser is the output end of the optical transmission component; the laser adopts a DFB (Distributed Feedback) laser with a line width of about 10MHz, which has a certain coherence length and a very good side mode suppression ratio. Using two core optical fibers in an optical cable can achieve interference phenomenon with high visibility.

[0050] In this embodiment, the first light receiving component and the second light receiving component both include a light detector and a photoelectric conversion unit connected in sequence along the transmission direction of light, and the response frequency of the photoelectric conversion unit in the second light receiving component is not less than 10 GHz. It should be noted that the photoelectric conversion unit can convert the optical signal representing the digital signal "0" and "1" received from the corresponding light receiving component into an electrical signal. In this embodiment, the photoelectric conversion unit is set to a response frequency of not less than 10 GHz. When the communication modulation rate is 1000 Mpbs, the photoelectric conversion unit in the second light receiving component will average the optical signal, thereby automatically filtering out the influence of the optical module on the interference quality after the light intensity is modulated. The use of high-frequency response helps to more accurately capture the rapidly changing optical signal, thereby reducing signal distortion and bit error rate, and at the same time has good noise suppression capability and improves the signal-to-noise ratio, thereby ensuring that the second light receiving component can efficiently and reliably process high-speed data streams.

[0051] The optical communication system in this embodiment is represented as optical communication system A, and the other optical communication system is represented as optical communication system B. The three forms of optical communication between the two are respectively shown in FIG. Figures 3 to 5 shown.

[0052] This embodiment can realize the monitoring of the security status of optical communication, which is beneficial to improve the security of optical communication. Specifically, this embodiment improves the internal structure of the optical communication system, and sets up a main control unit, an optical transmitting component that can emit pulse light and direct current light, a first optical receiving component that can receive pulse light transmitted by another optical communication system, and a second optical receiving component that can receive direct current light transmitted by another optical communication system. During the implementation process, the main control unit can parse and obtain the communication information corresponding to the first electrical signal and the sensor signal corresponding to the second electrical signal, and perform optical communication security status monitoring based on the sensor signal. Based on this, this embodiment can realize the security status monitoring of illegal intrusion behaviors such as external cutting, stripping and bending in the optical modules and transmission optical fibers of the communicating parties on the basis of normal optical communication, which can help to timely discover threat events in the optical communication process so as to take corresponding protective measures for optical fiber communication, thereby ensuring the security of optical communication.

[0053] Embodiment 2:

[0054] This embodiment discloses an optical communication method of the optical communication system as described in any one of Embodiment 1, including:

[0055] The main control unit sends a designated digital signal to the optical component driving unit so that the optical component driving unit performs signal modulation processing on the designated digital signal, that is, mixing the low-energy digital signal with the high-energy carrier signal generated by it to obtain a modulated signal, and transmits the modulated signal to the optical transmitting component so that the optical transmitting component outputs a transmitted light, and then transmits the transmitted light to another optical communication system through the optical module; wherein the transmitted light output by the optical transmitting component includes pulsed light and direct current light;

[0056] The first optical receiving component receives the pulse light transmitted by the other optical communication system through the optical module, and performs photoelectric conversion processing on it to obtain a first electrical signal, and then transmits the first electrical signal to the main control unit through the optical component driving unit, so that the main control unit can parse and obtain the communication information corresponding to the first electrical signal; it should be noted that the main control unit can eventually obtain the sender, that is, the information loaded by the other optical communication system.

[0057] The second optical receiving component receives the DC light transmitted by the other optical communication system through the optical module, and performs photoelectric conversion processing on it to obtain a second electrical signal, and then transmits the second electrical signal to the main control unit through the analog-to-digital conversion unit, so that the main control unit obtains a sensor signal corresponding to the second electrical signal, and monitors the optical communication security status based on the sensor signal. It should be noted that in this embodiment, both communicating parties can perform communication security monitoring. Once the main control units of both communicating parties learn that a threatening event has occurred in the transmission path or optical module based on the corresponding sensor signal, both communicating parties can extract the time and duration of the threatening event.

[0058] In this embodiment, the optical communication safety status monitoring is performed based on the sensor signal, including:

[0059] The main control unit determines whether a threat event occurs based on the sensing signal. If so, it proceeds to the next step. It should be noted that under normal communication conditions, the light intensity of the DC light received by the second light receiving component is relatively stable. In this embodiment, the main control unit can use the stable light intensity value as a reference value to detect threat events. Specifically, if there is a problem with the transmission path or optical module, such as refraction, obstruction, interference, and abnormal connection, the DC light intensity received by the main control unit will change significantly (become higher or lower). The main control unit can monitor the time domain changes of these light intensities in real time and use this to determine whether a threat event has occurred. In addition, in order to facilitate the staff to promptly learn about the occurrence of threat events, the main control unit also outputs warning information to the host computer after determining that a threat event has occurred.

[0060] The main control unit obtains the time when the first threat event occurs, generates alarm information based on the time when the first threat event occurs, and then communicates the alarm information to the other optical communication system, so as to obtain the time when the second threat event occurs obtained by the other optical communication system according to the alarm information sent by the other optical communication system;

[0061] The main control unit obtains the optical cable distance at which the threat event occurs according to the time when the first threat event occurs and the time when the second threat event occurs. It should be noted that, in this embodiment, the optical cable distance at which the threat event occurs is also the length of the optical cable between the optical communication systems in this embodiment of the threat event distance, which can also be referred to as the location information of the threat event occurrence. Based on this, the threat event can be located to facilitate maintenance personnel to perform maintenance operations.

[0062] In this embodiment, the optical cable distance at which the threat event occurs is:

[0063] ;

[0064] In the formula, L is the preset total length of the communication optical cable, n is the refractive index of the fiber of the preset communication optical cable, T A is the time when the first threat event occurs, T B is the time when the second threat event occurs, c The speed of light.

[0065] It should be noted that after the same threat event acts on the same optical fiber, the time it takes for the disturbance signal to reach the communicating parties is proportional to the distance, and the threat event can be located based on the two threat event occurrence times obtained by the main control units of the communicating parties. Lx When it is 0 meters, it can be determined that the location where the threat event occurs is the current optical communication system; when Lx When the value is half of the total length of the communication optical cable, the time when the disturbance signal is received by the second optical receiving components of the two communicating parties should be consistent, that is, the occurrence time of the two threat events obtained by the main control units of the two communicating parties is consistent, and the location where the threat event occurs can be determined to be the middle position of the communication optical cable between the two communicating parties; when the calculated Lx When the value is the total length of the communication optical cable, it is determined that the location where the threat event occurs is another optical communication system.

[0066] In this embodiment, after the main control unit determines that a threat event occurs according to the sensor signal, the method further includes:

[0067] The main control unit obtains the light intensity time domain data of the DC light received by the second light receiving component, and obtains the threat event type according to the light intensity time domain information; wherein the light intensity time domain data is:

[0068] ;

[0069] In the formula, E is the amplitude of the DC light received by the second light receiving component, For t The optical phase difference caused by the threat event at each moment is a time variable. is the initial phase difference of the 2*2 fiber coupler in the optical module. The theoretical value of this value is a fixed value. π .

[0070] It should be noted that, during the implementation process, the light intensity time domain data can be subjected to first-order derivative and Fourier transform calculations to obtain characteristic data such as amplitude, frequency and fluctuation characteristics, and the characteristic data can be compared with relevant thresholds of various preset threat events, thereby triggering pattern recognition of abnormal events. Deep learning recognition technology can also be used to perform intelligent processing on the signal segment, thereby realizing the identification and early warning of threat event types for optical fiber communication cables and optical communication systems.

[0071] It should be noted that the working details and technical effects of the optical communication method of the optical communication system provided in this embodiment 2 can be found in embodiment 1 and will not be described in detail here.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical communication system, characterized in that: It includes a main control unit, an optical component driving unit, an optical transmitting component, a first optical receiving component, a second optical receiving component, an optical module and an analog-to-digital conversion unit; the main control unit is connected to the input end of the optical transmitting component and the output end of the first optical receiving component respectively through the optical component driving unit, the output end of the optical transmitting component, the input end of the first optical receiving component and the input end of the second optical receiving component are all connected to the optical module, and the output end of the second optical receiving component is connected to the main control unit through the analog-to-digital conversion unit; The optical transmitting component is used to output the transmitted light under the drive of the optical component driving unit, and output the transmitted light to another optical communication system through the optical module, and the transmitted light output by the optical transmitting component includes pulse light and direct current light; correspondingly, the first optical receiving component is used to receive the pulse light transmitted by the other optical communication system through the optical module, and perform photoelectric conversion processing on it to obtain a first electrical signal, and then transmit the first electrical signal to the main control unit through the optical component driving unit, so that the main control unit parses and obtains the communication information corresponding to the first electrical signal; the second optical receiving component is used to receive the direct current light transmitted by the other optical communication system through the optical module, and perform photoelectric conversion processing on it to obtain a second electrical signal, and then transmit the second electrical signal to the main control unit through the analog-to-digital conversion unit, so that the main control unit obtains the sensor signal corresponding to the second electrical signal, and performs optical communication safety status monitoring based on the sensor signal; The optical module includes a wavelength division multiplexer, a 2*2 optical fiber coupler and a 1*2 optical fiber coupler. The input end of the wavelength division multiplexer is connected to the output end of the optical transmitting component, the output end of the wavelength division multiplexer is connected to the first input end of the 2*2 optical fiber coupler, the first output end of the 2*2 optical fiber coupler serves as the transmitting end of the optical communication system, the input end of the 1*2 optical fiber coupler serves as the receiving end of the optical communication system, the first output end of the 1*2 optical fiber coupler is connected to the input end of the first optical receiving component, the second output end of the 1*2 optical fiber coupler is connected to the second input end of the 2*2 optical fiber coupler, and the second output end of the 2*2 optical fiber coupler is connected to the input end of the second optical receiving component.

2. An optical communication system according to claim 1, characterized in that: The optical component driving unit includes a digital signal processor, an amplifier and a modulator. The digital signal processor is connected to the main control unit, the amplifier and the modulator respectively. The amplifier is connected to the output end of the first optical receiving component, and the modulator is connected to the input end of the optical transmitting component.

3. An optical communication system according to claim 2, characterized in that: The modulator is a lithium niobate MZ light intensity modulator.

4. An optical communication system according to claim 1, characterized in that: The optical emission component comprises a laser driver and a laser connected in sequence, the input end of the laser driver is the input end of the optical emission component, and the output end of the laser is the output end of the optical emission component; the laser is a DFB laser.

5. An optical communication system according to claim 1, characterized in that: The first light receiving component and the second light receiving component both include a photodetector and a photoelectric conversion unit connected in sequence along the transmission direction of light, and the response frequency of the photoelectric conversion unit in the second light receiving component is not less than 10 GHz.

6. An optical communication method of an optical communication system according to any one of claims 1 to 5, characterized in that: include: The main control unit sends a specified digital signal to the optical component driving unit, so that the optical component driving unit performs signal modulation processing on the specified digital signal to obtain a modulated signal, and transmits the modulated signal to the optical emission component, so that the optical emission component outputs emission light, and then transmits the emission light to another optical communication system through the optical module; wherein the emission light output by the optical emission component includes pulse light and direct current light; The first optical receiving component receives the pulse light transmitted by the other optical communication system through the optical module, performs photoelectric conversion processing on the pulse light to obtain a first electrical signal, and then transmits the first electrical signal to the main control unit through the optical component driving unit, so that the main control unit parses and obtains communication information corresponding to the first electrical signal; The second light receiving component receives the DC light transmitted by the other optical communication system through the optical module, and performs photoelectric conversion on it to obtain a second electrical signal, and then transmits the second electrical signal to the main control unit through the analog-to-digital conversion unit, so that the main control unit obtains a sensor signal corresponding to the second electrical signal, and monitors the optical communication safety status based on the sensor signal.

7. The optical communication method of the optical communication system according to claim 6, characterized in that: The optical communication safety status monitoring is performed based on the sensing signal, including: The main control unit determines whether a threat event occurs according to the sensor signal, and if so, proceeds to the next step; The main control unit obtains the time when the first threat event occurs, generates alarm information based on the time when the first threat event occurs, and then communicates the alarm information to the other optical communication system to obtain the time when the second threat event occurs obtained by the other optical communication system; The main control unit obtains the optical cable distance at which the threat event occurs according to the first threat event occurrence time and the second threat event occurrence time.

8. The optical communication method of the optical communication system according to claim 7, characterized in that: The optical cable distance where the threat event occurs is: ； In the formula, L is the preset total length of the communication optical cable, n is the refractive index of the fiber of the preset communication optical cable, T A is the time when the first threat event occurs, T B is the time when the second threat event occurs, c The speed of light.

9. The optical communication method of the optical communication system according to claim 7, characterized in that: After the main control unit determines that a threat event occurs according to the sensor signal, the method further includes: The main control unit obtains the light intensity time domain data of the DC light received by the second light receiving component, and obtains the threat event type according to the light intensity time domain information; wherein the light intensity time domain data is: ； In the formula, E is the amplitude of the DC light received by the second light receiving component, For t The optical phase difference caused by the momentary threat event, is the initial phase difference of the optical module.

Images