An underwater optical communication device with external light wake-up and multi-signal integrated transmission and a double-end device interaction method

Abstract

The application discloses an underwater optical communication device with external light wake-up and multi-signal integrated transmission and a double-end equipment interaction method, and belongs to the technical field of optical communication. The device comprises an underwater optical communication transceiving module, a multi-source fusion framing module, and connected sensing signal modules and video signal modules. The underwater optical communication transceiving module is integrated with a light wake-up unit, which only maintains basic optical channel monitoring in standby mode and switches to a working state after recognizing a preset external light wake-up signal. The multi-source fusion framing module fuses and frames low-rate sensing signals and high-speed video signals according to a composite frame structure, and sends the signals after coding and modulation by a green light emitting unit. The payload field of the composite frame structure is divided into a subfield for carrying high-speed data and low-speed data and a marker subfield. The application solves the problems of high energy consumption of underwater communication nodes in continuous online mode and congestion of heterogeneous data concurrent transmission, and is suitable for deep-sea observation network and underwater vehicle collaborative operation scenes.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to an underwater optical communication device and a dual-end device interaction method that features external optical wake-up and multi-signal integrated transmission. Background Technology

[0002] Integrated air-space-ground-sea communication aims for ubiquitous interconnection, integrated sensing, and green technology, requiring seamless coverage of marine and underwater scenarios. Underwater communication is a crucial link in addressing the shortcomings of marine communication within the integrated network. The underwater environment is a unique channel characterized by strong electromagnetic shielding, high scattering attenuation, and severe multipath interference. Radio frequency communication signals attenuate exponentially underwater, rendering effective transmission impossible. Underwater acoustic communication suffers from low speed, high latency, narrow bandwidth, and poor interference resistance, making it difficult to meet the high-speed, low-latency requirements of integrated communication. In contrast, blue-green band underwater optical communication offers advantages such as high transmission speed, resistance to electromagnetic interference, and abundant spectrum resources, making it a core technological solution suitable for integrated air-space-ground-sea underwater communication.

[0003] Existing underwater optical communication systems face two main technical challenges in practical deployment and application:

[0004] 1. Low efficiency of concurrent transmission of multi-source heterogeneous data: Underwater operations typically require the simultaneous transmission of low-rate text sensing signals such as water temperature and pressure, as well as high-rate video stream signals for environmental observation. Existing equipment often struggles to efficiently process this heterogeneous data, which spans clock domains and has a wide rate range, within a single underwater optical channel. This can easily lead to wasted channel resources, data interference, or video stuttering.

[0005] 2. Extremely high power consumption during long-term deployment: Underwater nodes (such as seabed observation network base stations and long-term dormant AUVs) have limited battery capacity. In order to maintain a state of constant accessibility, traditional communication equipment requires the transceiver module and main control unit to operate in a high-power state for a long time, which severely shortens the equipment's battery life and deployment life; while a direct power outage will result in the inability to respond to external communication requests.

[0006] This application aims to provide an underwater optical communication device and a dual-end device interaction method with external optical wake-up and multi-signal integrated transmission. By constructing an on-demand wake-up connection mode and a heterogeneous data multiplexing frame structure, it solves the above-mentioned technical problems of long-term standby and efficient fusion and concurrent multi-source data. Summary of the Invention

[0007] To address the aforementioned issues, this application discloses an underwater optical communication device with external optical wake-up and multi-signal integrated transmission, comprising: an underwater optical communication transceiver module, a multi-source fusion framing module, a sensor signal module, and a video signal module. It employs an underwater optical channel to perform full-duplex optical signal transmission, fusing low-rate text sensor signals with high-speed video signals before transmission, and switching power consumption states upon receiving an optical wake-up signal.

[0008] The underwater optical communication transceiver module and the optical wake-up unit are integrated into the same hardware combination for performing bidirectional optical signal transmission through the underwater optical channel. It includes an optical lens, a green light emitting unit, and a green light receiving unit.

[0009] The multi-source fusion framing module is connected to the underwater optical communication transceiver module, the sensing signal module, and the video signal module, respectively. It is internally configured with link management logic, which is used to acquire low-rate text sensing signals and high-speed video signals and generate fused data frames after exiting the standby state, and then transmit them through the underwater optical communication transceiver module.

[0010] The sensing signal module is used to collect one or more environmental information such as water temperature, water pressure, water turbidity, and water flow velocity to generate the low-rate text sensing signal.

[0011] The video signal module is used to acquire external images in real time and generate the high-speed video signal after the device exits standby mode.

[0012] Furthermore, when the device is in standby mode, the optical wake-up unit continuously monitors the changes in the underwater optical channel through the underwater optical communication transceiver module, and triggers the device to exit the standby mode and switch to the information transmission function when a preset wake-up signal is detected.

[0013] Furthermore, the power supply module is controlled by the optical wake-up unit. When the device is in standby mode, it is in the first power consumption state, in which the power supply module only maintains the basic optical channel monitoring function. After exiting the standby state, it is in the second power consumption state, in which the power supply module outputs the working voltage to the entire system and switches to the multi-source information transmission working mode. The energy consumption of the second power consumption state is greater than that of the first power consumption state.

[0014] Furthermore, the fused data frame is generated according to a preset composite frame structure, which includes, in sequence, a synchronization sequence field, a payload field, and a check data field. The payload field is further divided into a first data subfield carrying media access control layer data or high-speed video signals, a second data subfield carrying debugging information or low-rate sensor signals, and a marker subfield used to define the boundary, length, and frame termination status of the first and second data subfields.

[0015] Furthermore, the link management logic supports the establishment of communication links with peer devices, link keep-alive heartbeat monitoring, and controlled link disconnection.

[0016] Another objective of this application is to provide an underwater optical communication dual-end device interaction method with external optical wake-up and multi-signal integrated transmission, comprising the following steps:

[0017] Step S1: Respond to external instructions to exit standby mode, turn on the connection indicator light, and send a fused data frame containing connection request signaling to the peer device at the first preset cycle;

[0018] Step S2: After receiving the connection confirmation signaling from the peer device, send a link establishment completion signaling to the peer device to complete the handshake and establish a data path;

[0019] Step S3: The multi-source fusion framing module generates a fused data frame from the acquired low-rate sensor signal and high-speed video signal and sends it through the optical channel.

[0020] Step S4: During data transmission, heartbeat monitoring with a second preset period is initiated. If a fused data frame containing heartbeat signaling is not received from the peer device within a preset timeout threshold, the connection is automatically disconnected and the lights are turned off.

[0021] Step S5: Upon responding to the host computer's disconnect command, a fused data frame encapsulated with a first shutdown signaling is sent to the peer device. Upon receiving the first shutdown signaling, the peer device immediately responds with a shutdown confirmation signaling, simultaneously stops receiving data from the host computer and clears the data in its internal FIFO memory. After the data is cleared, it sends a fused data frame encapsulated with a link termination signaling to the local device. Upon receiving the link termination signaling, the local device replies with a stop signaling, thus achieving complete data transmission and controlled light shutdown.

[0022] Step S6, One-way link fault handling: When the sending path of the local device is abnormal while the receiving path is normal, the local device continues to send fused data frames containing heartbeat signaling according to the second preset period; after the peer device disconnects and stops sending due to not receiving the heartbeat signaling, the local device determines that the communication link is abnormal because it has not received the heartbeat signaling from the peer device within the preset timeout threshold, and then automatically interrupts information transmission, disconnects the internal connection and turns off the lights.

[0023] Step S1 of the method, which involves establishing a connection with the peer device, specifically includes the following sub-steps:

[0024] Step S301: Trigger connection establishment;

[0025] Step S302: Send a start command to the peer device;

[0026] Step S303: Receive the start confirmation command from the peer device;

[0027] Step S304: Send a connection confirmation to the peer device to complete the handshake and establish a data path.

[0028] Step S4 of the method, which involves performing bidirectional heartbeat monitoring with the peer device, specifically includes the following sub-steps:

[0029] Step S305: Send a heartbeat to the peer device;

[0030] Step S306: Receive the heartbeat sent by the peer device;

[0031] Step S5 of the method, which involves responding to an external disconnect command to disconnect the link and shut down the device, specifically includes the following sub-steps:

[0032] Step S307: Respond to the disconnect command;

[0033] Step S308: Send a disconnect message to the peer device;

[0034] Step S309: Receive disconnection confirmation from the peer device;

[0035] Step S310: Receive a disconnection message sent by the peer device;

[0036] Step S311: Send a disconnection confirmation to the peer device;

[0037] Step S312: Turn off the device.

[0038] Step S6 of the method, which involves performing unidirectional link fault handling with the peer device, specifically includes the following sub-steps:

[0039] Step S313: A heartbeat signal is sent to the peer device but is not received;

[0040] Step S314: Receive heartbeat signaling sent by the peer device;

[0041] Step S315: The peer device disconnects and shuts down because it has not received a heartbeat signaling within a timeout period.

[0042] Step S316: Continue sending heartbeat signals to the peer device, but they are not received;

[0043] Step S317: Since no heartbeat signaling was received from the peer device after a timeout, the connection is disconnected and the device is shut down.

[0044] The beneficial effects of this application are as follows:

[0045] First, it significantly reduces the standby power consumption of underwater optical communication equipment. Traditional underwater communication nodes require their main control and transceiver systems to remain in a high-power monitoring mode for extended periods to maintain constant accessibility, severely limiting the deployment time of unmanned underwater equipment. This application addresses this by physically integrating an optical wake-up unit within the transceiver module and setting up a separate power supply module to control it. This allows the equipment to maintain an extremely low-power monitoring state during standby, switching to full-system power supply only upon receiving a specific wake-up optical signal. This power consumption hierarchical management mechanism minimizes standby power consumption without sacrificing real-time response, effectively extending the equipment's underwater operating time.

[0046] Secondly, it improves the concurrent transmission efficiency of multi-source heterogeneous underwater data. Underwater operations typically require the simultaneous transmission of low-speed sensor data such as water temperature and pressure, as well as high-speed video streams for environmental observation. The two types of data have vastly different rates, which can easily lead to congestion or mutual interference when transmitted in a single optical channel. This application employs a composite frame structure, allocating independent data subfields for high-speed video data and low-speed sensor data within the payload field. Furthermore, it uses a marker subfield to define data boundaries and lengths, achieving stable synchronous transmission of both types of data within the same channel and improving the utilization of limited bandwidth resources.

[0047] Third, it shortens the communication link establishment time. The underlying state machine of this application directly enters the full-speed data transmission state after completing the wake-up handshake, without the need for an additional link listening or detection phase. In deep-sea communication scenarios, it can respond to communication requests more quickly and improve the real-time performance of the interaction.

[0048] Fourth, it improves the reliability of link connections. This application incorporates heartbeat maintenance and controlled disconnection mechanisms in its link management logic. When the communication link is abnormally interrupted due to channel obstruction or other reasons, both ends of the device can detect the loss of heartbeat in a timely manner and automatically close the connection, avoiding the system from being in a dead state of connection waiting for a long time. During normal disconnection, the device will wait for all internally buffered data to be sent before executing the handshake command in sequence, ensuring complete data transmission without loss. Attached Figure Description

[0049] Figure 1 This is a system connection diagram of an underwater optical communication device with external optical wake-up and multi-signal integrated transmission provided in the embodiments of this application.

[0050] Figure 2 This is a signaling flowchart of an underwater optical communication dual-end device interaction method with external optical wake-up and multi-signal integrated transmission provided in an embodiment of this application.

[0051] Figure 3 This is a frame structure diagram of an underwater optical communication device with external optical wake-up and multi-signal integrated transmission provided in the embodiments of this application.

[0052] List of reference numerals in the attached diagram:

[0053] 100-Clock Management Module; 101-Power Supply Module; 102-Power Supply Filter; 103-Low-Speed ​​Data / High-Speed ​​Data Acquisition Port; 104-Multi-Source Fusion Framing Module; 105-RS Encoder; 106-8B / 10B Encoder; 107-Parallel-to-Serial Converter; 108-Synchronization Sequence Insertion Module; 109-Signal Buffer; 110-MOSFET Driver Circuit; 111-Green Light Emitting Unit; 200-Optical Wake-up Unit; 201-Avalanche Photodiode; 202-Transimpedance Amplifier; 203-Secondary Operational Amplifier; 204-Automatic Gain Control Circuit; 205-Comparator; 206-Synchronization Sequence Detector; 207-Serial-to-Parallel Converter; 208-8B / 10B Decoder; 209-RS Decoder; 210-Frame Deconstruction Module; 211-Low-Speed ​​Data / High-Speed ​​Data Buffer; 400-Fused Data Frame; 401-Synchronization Sequence Field; 402 - Payload field; 403 - Check data field; 411 - First data subfield; 412 - Second data subfield; 413 - Flag subfield; 421 - First length bit; 422 - Second length bit; 423 - End flag bit. Detailed Implementation

[0054] The present application will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the present application. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0055] like Figure 1 As shown in the illustration, this application provides an underwater optical communication device with external optical wake-up and multi-signal integrated transmission. It uses underwater green light as the communication carrier and supports full-duplex optical signal transmission. The underlying hardware signal processing link of the device includes a transmitting link and a receiving link. To optimize the overall hardware size and power consumption, the optical wake-up unit 200 and the underwater optical communication transceiver module are highly integrated in physical form, forming a single transceiver hardware combination.

[0056] The system defines a reconfigurable encrypted wake-up frame structure. Through hardware-level P10 / P8 permutation operations and Feistel round function mapping, the system encrypts light-triggered wake-up control commands, achieving secure link matching between different user nodes and supporting online updates of the 10-bit initial key. The control commands adopt a clearly defined boundary frame format, defined as: "EE AB + Encryption Command Set + EE AB". The sending end escapes the "EE" byte to ensure the uniqueness of frame boundaries, thereby improving the accuracy of control command parsing.

[0057] An underwater optical communication device with external optical wake-up and multi-signal integrated transmission includes: an underwater optical communication transceiver module, a multi-source fusion framing module 104, a sensor signal module, and a video signal module. The underwater optical communication transceiver module performs bidirectional optical signal transmission through an underwater optical channel and integrates an optical wake-up unit 200. When the device is in standby mode, the optical wake-up unit 200 continuously monitors the underwater optical channel through the underwater optical communication transceiver module and triggers the device to exit standby mode upon detecting a preset external optical wake-up signal, suspending the monitoring function of the optical wake-up unit 200. The multi-source fusion framing module 104 is connected to the underwater optical communication transceiver module and, after exiting standby mode, acquires low-rate text sensor signals and high-speed video signals, fuses and frames the multi-source heterogeneous signals according to a preset composite frame structure, generates a fused data frame 400, and transmits it through the underwater optical communication transceiver module. The sensor signal module collects one or more environmental information from water temperature, water pressure, water turbidity, and water flow velocity to generate a low-rate text sensor signal. The video signal module is used to acquire external images in real time and generate high-speed video signals after the device exits standby mode.

[0058] The power supply module 101 is controlled by the optical wake-up unit 200. When the device is in standby mode, it is in the first power consumption state. At this time, the power supply module 101 only maintains the basic monitoring power of the optical wake-up unit 200 and the underwater optical communication transceiver module. After exiting the standby state, it is in the second power consumption state. The power supply module 101 outputs the working voltage to the entire system, and the energy consumption of the second power consumption state is greater than that of the first power consumption state.

[0059] The transmitting link includes: a clock management module 100, a power supply module 101, a power filter 102, a low-speed data / high-speed data acquisition port 103, a multi-source fusion framing module 104, an RS encoder 105, an 8B / 10B encoder 106, a parallel-to-serial converter 107, a synchronization sequence insertion module 108, a signal buffer 109, a MOSFET driving circuit 110, and a green light transmitting unit 111.

[0060] The receiver link includes: an avalanche photodiode 201, a transimpedance amplifier 202, a second-stage operational amplifier 203, an automatic gain control circuit 204, a comparator 205, a synchronization sequence detector 206, a serial-to-parallel converter 207, an 8B / 10B decoder 208, an RS decoder 209, a frame deframe module 210, and a low-speed data / high-speed data buffer 211.

[0061] The working principles of each module are as follows:

[0062] To achieve low-power standby wake-up functionality for communication nodes, this system designs an external optical wake-up mechanism based on coded optical pulse sequences. Specifically, the wake-up signal uses OOK modulation to map the digital control sequence to the on / off state of the light source, where logic "1" corresponds to the light source being on and logic "0" corresponds to the light source being off. When the received sequence matches the locally stored wake-up sequence, the wake-up signal is deemed valid, and the communication node is triggered to exit the standby state.

[0063] The clock management module 100 is used to provide a unified clock reference for the transmitting and receiving links, ensuring data synchronization and stable operation between the modules.

[0064] The multi-source fusion framing module 104 performs time-division multiplexing of the high-speed video stream generated by the low-speed data / high-speed data acquisition port 103 with the low-speed sensor text to generate a fused data frame 400.

[0065] The RS encoder 105 and the 8B / 10B encoder 106 perform forward error correction coding and line coding on the framed data in sequence to ensure the anti-interference capability and DC balance of the transmission link.

[0066] The synchronization sequence insertion module 108 inserts a high-autocorrelation synchronization sequence into the header of the serial bitstream after conversion by the parallel-to-serial converter 107, so that the receiving end can perform alignment. Specifically, one transceiver unit transmits sequence 1 and uses sequence 2 as a local reference sequence for correlation detection; while the other transceiver unit adopts the opposite configuration, that is, it transmits sequence 2 and performs correlation operation with sequence 1. In this way, the target signal transmitted by the remote node and the local self-interference signal are mapped to the autocorrelation peak and cross-correlation peak of the same preferred sequence pair, respectively. The signal-to-noise ratio difference between the two correlation peaks can effectively suppress the self-interference signal.

[0067] The green light emitting unit 111 is driven by the signal buffer 109 and the MOSFET driving circuit 110, converting the level signal into a modulated optical signal for emission. The green light emitting unit 111 adopts OOK modulation, and the MOSFET driving circuit 110 controls the switching of the MOSFET to achieve optical modulation of the digital signal. The power supply module 101 and the power filter 102 provide clean power to this link.

[0068] The avalanche photodiode 201 serves as the core photoelectric conversion device, capturing weak underwater light signals and converting them into weak current.

[0069] The signal conditioning and amplification components use a transimpedance amplifier 202 and a second-stage operational amplifier 203 for two-stage amplification, and the automatic gain control circuit 204 performs dynamic amplitude adjustment to overcome the complex attenuation fluctuations in the underwater channel. Then, the signal is sampled and quantized into a digital signal by a comparator 205.

[0070] After the synchronization sequence detector 206 identifies the start position of the frame, the data is converted into parallel data by the serial-to-parallel converter 207, and then decoded by the 8B / 10B decoder 208 and the RS decoder 209 in sequence. Finally, the frame deconstruction module 210 restores the composite frame into the original heterogeneous data. The low-speed sensor data is output to the low-speed data part of the low-speed data / high-speed data buffer 211, and the high-speed video data is output to the high-speed data part of the low-speed data / high-speed data buffer 211.

[0071] The underwater optical communication transceiver module adopts 8B / 10B channel coding in the underlying hardware link. The transmission link channel is encoded by an 8B / 10B encoder 106 and the reception link channel is decoded by an 8B / 10B decoder 208. The fused data frame 400 is transmitted in the upper layer based on the TCP / IP protocol.

[0072] The multi-source fusion framing module 104 is configured with link management logic, which supports the establishment of communication links with peer devices, link keep-alive heartbeat monitoring, and controlled disconnection of links.

[0073] like Figure 3 As shown, the fused data frame 400 generated by the multi-source fusion framing module 104 has a composite frame structure that includes, in sequence, a 127-bit synchronization sequence field 401, a 223-byte payload field 402, and a 32-byte check data field 403.

[0074] The payload field 402 is further divided into: a first data subfield 411 carrying high-speed video streams, a second data subfield 412 carrying low-speed text sensing data, and a marker subfield 413. The marker subfield 413 is specifically subdivided into an 8-bit first length bit 421, a 7-bit second length bit 422, and a 1-bit end flag bit 423. Through this structure, the system achieves efficient concurrency of heterogeneous data within a single channel.

[0075] like Figure 2As shown in the embodiment of this application, an underwater optical communication dual-end device interaction method with external optical wake-up and multi-signal integrated transmission is provided. It is applied between the local device and the remote device. All signaling is encapsulated in a fused data frame 400 for transmission. The header of the fused data frame 400 includes a synchronization sequence field 401. The method includes the following steps:

[0076] Connection establishment phase:

[0077] Step S301: After the local device responds to the host computer's instruction to exit the standby state, it triggers the connection establishment logic.

[0078] In step S302, the local device actively sends a start command to the remote device.

[0079] Step S303: After parsing, the peer device sends back a start confirmation command.

[0080] Step S304: The local device replies with a connection confirmation, indicating the handshake is complete.

[0081] After the wake-up handshake is completed, the underlying state machines of the local and remote devices immediately bypass the secondary detection phase and directly enter the full-speed data transmission state.

[0082] Heartbeat maintenance phase:

[0083] Step S305: The local device sends a heartbeat to the remote device.

[0084] Step S306: The peer device sends a heartbeat to the local device.

[0085] When there is no service data transmission, the two-end devices send heartbeat signals to each other. When the underwater optical channel is blocked, causing the heartbeat to be lost and the connection to fail, the fault sensing end immediately and automatically triggers the shutdown of the device to prevent the system from seemingly freezing.

[0086] Controlled disconnection phase:

[0087] Step S307: The first device responds to the host computer's disconnect command.

[0088] Step S308: The first device sends a disconnect message to the second device.

[0089] In step S309, the second-end device sends a disconnection confirmation, stops receiving data from the host computer, and clears the data in the internal FIFO memory.

[0090] In step S310, after the data in the internal FIFO memory is cleared, the second-end device sends a disconnection message to the first-end device.

[0091] Step S311: The first device replies with a disconnection confirmation.

[0092] In step S312, the two-end devices are shut down in sequence under controlled conditions.

[0093] One-way fault handling phase:

[0094] When the local device's transmitting path is abnormal while the receiving path is normal:

[0095] Step S313: The local device sends a heartbeat to the remote device according to the second preset period; at the same time, the remote device sends a heartbeat to the local device according to the second preset period.

[0096] Step S314: The local device receives the heartbeat sent by the remote device;

[0097] Step S315: The peer device cannot receive the heartbeat sent by the local device due to the abnormal transmission path. After the internal timeout exceeds the preset timeout threshold, the connection is determined to be abnormal, and the device is shut down and the heartbeat is stopped.

[0098] Step S316: The local device continues to send heartbeats to the remote device according to the second preset cycle;

[0099] Step S317: If the local device does not receive a heartbeat from the peer device after the internal timeout exceeds the preset timeout threshold, it determines that the communication link is abnormal and performs a device shutdown operation.

[0100] This device can be used for collaborative operations between deep-sea fixed observation networks and autonomous underwater vehicles (AUVs). During long-term deployment, the seabed node carries this device and operates in a first power consumption state, maintaining only the monitoring power of the optical wake-up unit. When the AUV approaches and emits its wake-up beam, the seabed node instantly switches to a second power consumption state. Figure 2 The process shown establishes a connection, linking environmental sensor text with underwater high-definition video streams according to... Figure 3 The data is packaged into a composite frame structure and transmitted back. After data transmission is complete, both parties disconnect in a controlled manner through a handshake mechanism and then return to sleep mode.

[0101] The technical means disclosed in this application are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. An underwater optical communication device with external optical wake-up and multi-signal integrated transmission, characterized in that, The device includes an underwater optical communication transceiver module for bidirectional optical signal transmission in an underwater channel; and a multi-source fusion framing module (104) connected to the underwater optical communication transceiver module. The underwater optical communication transceiver module integrates an optical wake-up unit (200). When the device is in standby mode, the optical wake-up unit (200) continuously monitors changes in the underwater optical channel through the underwater optical communication transceiver module, and triggers the device to exit standby mode and switch to the information transmission function of the optical communication system when a preset external optical wake-up signal is detected; switching to the information transmission working state; the multi-source fusion framing module... (104) is used to acquire low-rate text sensing signals and high-speed video signals after exiting the standby state, and to fuse and frame multi-source heterogeneous signals according to a preset composite frame structure to generate a fused data frame (400), which is then transmitted by the underwater optical communication transceiver module after encoding and modulation; the multi-source fusion framing module (104) is also connected to the sensing signal module and the video signal module; the sensing signal module is used to collect environmental information to generate the low-rate text sensing signal; the video signal module is used to collect external images in real time after the device exits the standby state to generate the high-speed video signal.

2. The underwater optical communication device with external optical wake-up and multi-signal integrated transmission according to claim 1, characterized in that, The optical wake-up unit (200) reuses the data receiving optical path of the underwater optical communication transceiver module and performs single matching logic based on the sequence determination threshold. When a preset wake-up signal is identified at once, the device is triggered to exit the standby state and complete the wake-up handshake.

3. The underwater optical communication device with external optical wake-up and multi-signal integrated transmission according to claim 2, characterized in that, The multi-source fusion framing module (104) is also configured with link management logic, which supports the establishment of communication links with peer devices, link keep-alive heartbeat monitoring, and controlled disconnection of links.

4. The underwater optical communication device with external optical wake-up and multi-signal integrated transmission according to claim 3, characterized in that, The fused data frame (400) includes, in sequence, a synchronization sequence field (401), a payload field (402), and a check data field (403); wherein, the payload field (402) is further divided into: a first data subfield (411) carrying media access control layer data or high-speed video signals, a second data subfield (412) carrying debugging information or low-rate text sensing signals, and a marker subfield (413) used to define the boundary, length, and frame termination status of the first data subfield (411) and the second data subfield (412).

5. An underwater optical communication device with external optical wake-up and multi-signal integrated transmission as described in claim 4, characterized in that, The marker subfield (413) specifically includes: a first length bit (421) for indicating the length of the first data subfield (411), a second length bit (422) for indicating the length of the second data subfield (412), and an end flag bit (423) for indicating the frame termination state.

6. An underwater optical communication device with external optical wake-up and multi-signal integrated transmission as described in claim 5, characterized in that, The underwater optical communication transceiver module includes an optical lens, a green light emitting unit (111), and a green light receiving unit; the green light emitting unit (111) adopts OOK modulation and includes a MOSFET driving circuit (110), which controls the switching on and off of the MOSFET in the MOSFET driving circuit to realize the optical modulation of digital signals. The green light receiving unit adopts an avalanche photodiode receiving method and includes, in sequence: an avalanche photodiode (201) for photoelectric conversion, a drive boost circuit that provides reverse bias voltage, a transimpedance amplifier (202) for primary amplification, a secondary operational amplifier (203), a high-pass filter to filter out background light interference, an automatic gain control circuit (204) for dynamic amplitude adjustment, and a comparator (205) for sampling quantization and outputting digital signals.

7. An underwater optical communication device with external optical wake-up and multi-signal integrated transmission as described in claim 6, characterized in that, It also includes a power supply module (101) controlled by the optical wake-up unit; when the device is in standby mode, it is in a first power consumption state, at which time the power supply module (101) only maintains the basic monitoring power of the optical wake-up unit and the underwater optical communication transceiver module; after exiting the standby state, it is in a second power consumption state, the power supply module (101) outputs the working voltage to the entire system, and the energy consumption of the second power consumption state is greater than that of the first power consumption state.

8. An underwater optical communication device with external optical wake-up and multi-signal integrated transmission as described in claim 7, characterized in that, The underwater optical communication transceiver module includes an RS encoder (105) and an 8B / 10B encoder (106) for transmitting link channel coding, and an RS decoder (209) and an 8B / 10B decoder (208) for receiving link channel decoding, so as to implement the 8B / 10B channel coding method in the underlying hardware link; and the underwater optical communication transceiver module establishes a communication link based on the TCP / IP protocol at the upper layer to transmit the fused data frame (400).

9. A method for interaction between two underwater optical communication devices with external optical wake-up and multi-signal integrated transmission, applied to a local device, wherein the local device employs an underwater optical communication device with external optical wake-up and multi-signal integrated transmission as described in any one of claims 1-8, characterized in that... Includes the following steps: Step S1: Respond to the host computer instruction to exit the standby state, turn on the LED to send a light wake-up signal to the peer device, and send a fused data frame (400) encapsulated with connection request signaling to the peer device at the first preset period. Step S2: After receiving the connection confirmation signaling from the peer device, send a link establishment completion signaling to the peer device to complete the handshake and establish a data path; Step S3, the multi-source fusion framing module (104) generates a fused data frame (400) from the acquired low-rate sensor signal and high-speed video signal and sends it through the optical channel; Step S4, during data transmission, heartbeat monitoring with a period of the second preset period is started. If the fused data frame (400) containing heartbeat signaling sent by the peer device is not received within the preset timeout threshold, the connection is automatically disconnected and the lights are turned off. Step S5: Upon responding to the host computer's disconnect command, a fused data frame (400) encapsulating a first shutdown signaling is sent to the peer device. After receiving the first shutdown signaling, the peer device immediately responds with a shutdown confirmation signaling, stops receiving data from the host computer, and clears the data in its internal FIFO memory. After the data is cleared, it sends a fused data frame (400) encapsulating a link termination signaling to the local device. After receiving the link termination signaling, the local device replies with a stop signaling. Step S6, One-way link fault handling: When the sending path of the local device is abnormal while the receiving path is normal, the local device continues to send fused data frames (400) containing heartbeat signaling according to the second preset period; after the peer device disconnects and stops sending due to not receiving the heartbeat signaling, the local device determines that the communication link is abnormal because it has not received the heartbeat signaling from the peer device within the preset timeout threshold, and then automatically interrupts information transmission, disconnects the internal connection and turns off the lights.

10. The underwater optical communication dual-end device interaction method with external optical wake-up and multi-signal integrated transmission according to claim 9, characterized in that, The connection establishment process with the peer device in step S1 specifically includes the following sub-steps: Step S301: Trigger connection establishment; Step S302: Send a start command to the peer device; Step S303: Receive the start confirmation command from the peer device; Step S304: Send a connection confirmation to the peer device to complete the handshake and establish a data path; The bidirectional heartbeat monitoring performed with the peer device in step S3 specifically includes the following sub-steps: Step S305: Send a heartbeat to the peer device; Step S306: Receive the heartbeat sent by the peer device; Step S5, which involves responding to the host computer's disconnection command to disconnect the link and shut down the device, specifically includes the following sub-steps: Step S307: Respond to the host computer's disconnect command; Step S308: Send a disconnect message to the peer device; Step S309: Receive disconnection confirmation from the peer device; Step S310: Receive a disconnection message sent by the peer device; Step S311: Send a disconnection confirmation to the peer device; Step S312, shut down the device; The unidirectional link failure handling in step S6 specifically includes the following sub-steps: Step S313: The local device sends a heartbeat to the remote device according to the second preset period; Step S314: The local device receives the heartbeat sent by the remote device; Step S315: Since the peer device has not received the heartbeat, it determines that the communication link is abnormal after the internal timeout threshold is exceeded, and then shuts down the device and stops sending heartbeats. Step S316: The local device continues to send heartbeats to the remote device according to the second preset cycle; Step S317: If the local device does not receive a heartbeat from the peer device after the internal timeout threshold has been exceeded, it determines that the communication link is abnormal and shuts down the device.

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