Communication device and communication method based on underwater blue-green light connector

Abstract

The invention belongs to the technical field of communication, and discloses a communication device based on an underwater blue-green light connector, which is composed of a blue light connector and a green light connector, adopts laser as a communication carrier, loads binary data flow onto the laser and sends the binary data flow to a PMT (photomultiplier); and the PMT converts and demodulates the received laser signal and outputs the converted and demodulated laser signal to a using terminal. Compared with wired communication, the device has the advantages that the AUV can move more flexibly in a larger range; compared with sound communication, higher-speed transmission can be carried out, and the problem of communication of the AUV under the short-distance condition is solved; compared with traditional laser communication, the device is high in stability, optical divergence design and high-dynamic-range gain design are added into the device, and the stability of a channel can be kept under the condition of water turbulence.

Description

Technical Field

[0001] The present invention belongs to the field of communication technologies, and particularly relates to an underwater blue-green light connector-based communication device and a communication method. Background Art

[0002] In the process of ocean exploration and development, as a key piece of equipment, the AUV (Autonomous Underwater Vehicle) plays an important role in the fields of ocean scientific research, resource exploration, and underwater infrastructure detection by virtue of its high autonomy and flexible mobility. However, traditional AUVs face bottlenecks in communication and energy supply. Wired connections not only restrict the activity radius of the AUV, but also easily damage the interface due to frequent plugging and unplugging, increasing the maintenance cost; acoustic communication can achieve a certain distance of transmission, but has a low rate, is vulnerable to ocean environment interference, and has a communication blind spot in short-distance communication; electromagnetic communication attenuates severely in water. Against this background, it is necessary to develop a high-performance underwater wireless optical connector device dedicated to AUVs to achieve high-speed and stable data interaction between AUVs and platforms such as underwater fixed base stations and surface mother ships, as well as efficient and safe energy transmission.

[0003] Through the above analysis, the problems and defects existing in the prior art are as follows:

[0004] Traditional AUVs face bottlenecks in communication and energy supply. Wired connections not only restrict the activity radius of the AUV, but also easily damage the interface due to frequent plugging and unplugging, increasing the maintenance cost; acoustic communication can achieve a certain distance of transmission, but has a low rate, is vulnerable to ocean environment interference, and has a communication blind spot in short-distance communication; electromagnetic communication attenuates severely in water. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides an underwater blue-green light connector-based communication device.

[0006] The present invention is implemented as follows. An underwater blue-green light connector-based communication device includes:

[0007] A blue light connector and a green light connector;

[0008] Using laser as the communication carrier, loading the binary data stream onto the laser and sending it to the PMT, and the PMT converts, demodulates the received laser signal and outputs it to the user terminal;

[0009] The underwater blue light connector includes a high-speed FPGA, a signal conversion module, a signal driving module, a PMT, a condenser lens, a filter, an LD, and emission optics;

[0010] The blue light connector uses a blue light LD and an NP525 filter, and the green light connector uses a green light LD and an NP450 filter.

[0011] Among them, the high-speed FPGA: internally caches the received and converted data, encodes the data using an 8B / 10B encoder, and after serial-to-parallel conversion, outputs an LVTTL level signal to the signal driving module;

[0012] The signal conversion module: converts the weak current signal into an LVTTL level signal that can be processed by the FPGA, and enables the communication dynamic range ≥ 30 dB;

[0013] The signal driving module: loads the LVTTL level signal onto the LD light source and emits it through a constant current source and a modulation source.

[0014] Furthermore, the PMT: a photoelectric conversion device that converts the optical signal into a weak current signal.

[0015] Furthermore, the condenser lens: plays a role in condensing light and focuses the weak light signal within the receiving aperture.

[0016] Furthermore, the filter: filters out the influence of its own light source and other natural light sources.

[0017] Furthermore, the LD: an electro-optical conversion device that converts the level signal into an optical signal and emits it.

[0018] Furthermore, the transmitting optics: uses a combination lens to shape the narrow beam LD light source into a uniform large spot, ensuring a good channel under conditions such as water body turbulence.

[0019] Another object of the present invention is to provide an underwater blue-green light connector-based communication method, including:

[0020] Step 1, by using the high-speed FPGA: internally caches the received and converted data, encodes the data using an 8B / 10B encoder, and after serial-to-parallel conversion, outputs an LVTTL level signal to the signal driving module;

[0021] Step 2, through the signal conversion module: converts the weak current signal into an LVTTL level signal that can be processed by the FPGA, and enables the communication dynamic range ≥ 30 dB; through the signal driving module: loads the LVTTL level signal onto the LD light source and emits it through a constant current source and a modulation source;

[0022] Step 3, through the PMT: a photoelectric conversion device that converts the optical signal into a weak current signal; through the condenser lens: plays a role in condensing light and focuses the weak light signal within the receiving aperture; through the filter: filters out the influence of its own light source and other natural light sources;

[0023] Step 4, through the LD: an electro-optical conversion device that converts the level signal into an optical signal and emits it;

[0024] Step 5, through the emission optics: Use a combination lens to shape the narrow-beam LD light source into a uniform large spot, ensuring a good channel under conditions such as water turbulence.

[0025] Another object of the present invention is to provide a computer device, the computer device includes a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the underwater blue-green light adapter communication method.

[0026] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the processor executes the steps of the underwater blue-green light adapter communication method.

[0027] Another object of the present invention is to provide an information data processing terminal for implementing the underwater blue-green light adapter communication device.

[0028] Combined with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0029] This device has significant advantages compared with traditional wired communication and underwater acoustic communication. In the traditional wired communication mode, the AUV (Autonomous Underwater Vehicle) is physically restricted by the cable, and its operating range is limited, making it difficult to be flexible and maneuverable in complex waters. When using this device for underwater blue-green light wireless communication, high-speed data interaction between the AUV and the mother ship or other underwater devices can be achieved without physical connection, enabling the AUV to cover a wider detection area and improve operation efficiency. In addition, compared with underwater acoustic communication, this device provides a higher data transmission rate, effectively solving the problems of limited underwater acoustic communication bandwidth (usually at the kbps level), severe multipath interference, and the influence of the "blind zone" on short-distance communication. Especially in the short-distance data interaction scenario between the AUV and the mother ship, the underwater acoustic signal may cause data interruption due to refraction or interference, while this device uses blue-green light communication technology and performs excellently in short-distance high-bandwidth applications, ensuring the communication stability and reliability of the AUV in tasks such as cooperative operations and data backhaul.

[0030] This device introduces optical divergence design and high-dynamic-range gain design in the underwater blue-green light communication system to improve communication stability and overcome the deficiencies of traditional laser communication. In traditional underwater LD (laser diode) communication, due to its narrow beam divergence and elliptical spot distribution, when encountering water turbulence or external disturbances, the communication link is prone to interruption, resulting in serious signal attenuation. To address this problem, this device adds an optical shaping lens group at the optical front end of the transmitter, expanding the original narrow beam into a large divergence angle spot with uniform distribution, thereby increasing the signal coverage range and reducing the impact of water disturbance on the light propagation path. At the same time, the AGC (automatic gain control) technology is introduced in the signal conversion module, which can dynamically adjust the gain range according to the strength of the received signal, ensuring that the communication link can maintain a high signal-to-noise ratio (SNR) under different water depths, turbulence intensities, and ambient light interference conditions. This innovative design enables the device to have stronger anti-interference ability and still maintain stable data transmission in complex underwater environments.

[0031] This device uses a high-speed FPGA (field programmable gate array) for data processing and transmission, breaking through the limitations of the traditional OOK (on-off keying) low-speed modulation method and achieving more efficient data communication. In the traditional OOK modulation method, since data is transmitted only by relying on the "on" or "off" state of the signal, it is greatly affected by the water environment and optical channel fluctuations, resulting in low data throughput and high bit error rate. This device, through the high-speed clock driving mechanism built into the FPGA and combined with 8B / 10B coding, converts the input data into a serial bit stream and recovers the clock at the signal transition to ensure that the transmission rate is stable at the 100 Mbps level, far higher than traditional underwater acoustic communication and low-speed optical communication solutions. In addition, this data processing method can effectively reduce inter-symbol interference and improve the decoding accuracy of data, enabling the AUV to achieve high-bandwidth, low-latency real-time communication in complex underwater environments and meeting the requirements of underwater large-data volume transmission.

[0032] The technical solution of the present invention not only has significant technological innovation, but also has broad prospects in market application and industry development. According to industry forecasts, by 2025, the market size of underwater junction boxes will reach billions of yuan and maintain an annual growth rate of about 15%, indicating that the demand for underwater wireless communication is growing rapidly. As an underwater blue-green light communication connector, this device can completely replace traditional underwater junction boxes and demonstrate greater commercial value in application scenarios such as AUV collaborative operations, data backhaul, remote control, and equipment maintenance. At the same time, this technology fills the technical gap of high-speed underwater wireless communication at home and abroad, providing an efficient, low-power, and high-stability underwater communication solution for fields such as the national marine strategy, marine resource exploration, undersea oil and gas development, and undersea sensor networks. Especially in the aspect of high-speed data interaction between AUV and the mother ship at close range, this device breaks through the rate bottleneck of underwater acoustic communication, solves the adaptability problem of wired communication in the underwater environment, enables AUV to complete high-precision autonomous operations in a more complex marine environment, and helps the development of marine intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the structural block diagram of the underwater blue-green light connector communication device provided by an embodiment of the present invention.

[0034] Figure 2 is the flowchart of the underwater blue-green light connector communication method provided by an embodiment of the present invention.

[0035] Figure 3 is the internal composition diagram of the underwater blue-green light connector communication device provided by an embodiment of the present invention.

[0036] Figure 4 is the divergence diagram of the emission light source provided by an embodiment of the present invention.

[0037] Figure 5 is the communication schematic diagram of the underwater blue-green light connector communication device provided by an embodiment of the present invention.

[0038] Figure 6 is the application example diagram provided by an embodiment of the present invention

[0039] Figure 3 : 1. Integrated board (including high-speed FPGA, signal conversion module, signal drive module); 2. Receiver (including PMT, lens); 3. Filter; 4. LD; 5. Emission optics. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] As Figure 1 shown, a communication device based on an underwater blue - green light connector provided by an embodiment of the present invention consists of a blue - light connector and a green - light connector. Using laser as the communication carrier, a binary data stream is loaded onto the laser and sent to a PMT (photomultiplier tube), and the PMT converts, demodulates the received laser signal and outputs it to the using terminal.

[0042] The underwater blue - light connector includes a high - speed FPGA, a signal conversion module, a signal driving module, a PMT, a condenser lens, a filter 3, an LD4 (laser diode), and a transmitting optics 5; Since this device realizes two - way wireless communication, the green - light connector has the same composition as the blue - light connector. The difference is that the blue - light connector uses a blue - light LD and an NP525 filter, while the green - light connector uses a green - light LD and an NP450 filter.

[0043] Among them, the high - speed FPGA: internally caches the received and converted data, encodes the data using an 8B / 10B encoder, and after parallel - to - serial conversion, outputs an LVTTL level signal to the signal driving module.

[0044] The signal conversion module: converts a weak current signal into an LVTTL level signal that can be processed by the FPGA, and enables the communication dynamic range ≥ 30 dB.

[0045] The signal driving module: loads the LVTTL level signal onto the LD light source through a constant - current source and a modulation source and emits it.

[0046] PMT: a photoelectric conversion device that converts an optical signal into a weak current signal.

[0047] The condenser lens: plays a role in condensing light and focuses the weak light signal within the receiving aperture.

[0048] The filter: filters out the influence of its own light source and other natural light sources, and improves the signal - to - noise ratio.

[0049] LD: an electro - optical conversion device that converts a level signal into an optical signal and emits it.

[0050] The transmitting optics: uses a combination lens to shape the narrow - beam LD light source into a uniform large light spot, ensuring a good channel under conditions such as water body turbulence.

[0051] The system utilizes the OOK modulation technology. The terminal sends the data stream to the high-speed FPGA in the blue light adapter for encoding. The encoded binary data stream drives the LD to perform optical information transmission through the transmitting optics. The green light adapter uses a PMT to detect the optical signal, and a high-speed, low-noise non-unit-gain stable operational amplifier is used as a transimpedance amplifier to ensure high gain and high bandwidth for "optical-to-electrical" conversion. Subsequently, the weak electrical signal is converted into an LVTTL level signal that can be received by the high-speed FPGA. After decoding inside the FPGA, it is sent to the terminal. Vice versa.

[0052] The underwater blue and green light adapter communication device of the present invention consists of a blue light adapter and a green light adapter. Using laser as the communication carrier, the binary data stream is modulated onto the LD (laser diode) for optical transmission. The LD at the transmitting end emits a modulated optical signal, and the PMT (photomultiplier tube) at the receiving end detects it and converts the received optical signal into a weak current signal. After signal conversion and processing, it is restored to a digital signal to achieve high-speed two-way underwater optical communication. Since this device needs to support two-way communication simultaneously, the system architectures of the blue light adapter and the green light adapter are basically the same, only differing in the light source and the filter: the blue light adapter uses a blue LD and an NP525 filter, and the green light adapter uses a green LD and an NP450 filter.

[0053] The signal processing flow of the underwater blue light adapter mainly includes data encoding, signal conversion, optical signal transmission and reception. The data source sends the data stream to the high-speed FPGA through the terminal device. The FPGA encodes the data with 8B / 10B, and then outputs an LVTTL level signal to the signal driving module after serial-to-parallel conversion. The signal driving module consists of a constant current source and a modulation source to ensure stable optical output of the LD and meet the modulation requirements. Subsequently, the LD emits the optical signal into the water. The transmitting optical system uses a combination lens to convert the narrow beam of the LD into a uniform large spot, ensuring the stability of the underwater communication channel in complex environments such as turbulence. After the PMT at the receiving end detects the optical signal, it converts it into a weak current signal and inputs it to the signal conversion module. This module uses automatic gain control (AGC) to ensure that the signal dynamic range ≥ 30dB, and finally restores the LVTTL level signal to the FPGA, decodes it and transmits it to the terminal.

[0054] The working principle of the green light adapter is completely symmetrical to that of the blue light adapter, and it is mainly used for the reception and processing of underwater optical signals. After the PMT detects the optical signal, a transimpedance amplifier is used for high-speed, low-noise, non-unit-gain stable operational amplification to ensure high gain and high bandwidth during the "optical-to-electric" conversion process and avoid signal distortion. Subsequently, the signal is converted into an LVTTL level signal and input to a high-speed FPGA for decoding, and the decoded data is then transmitted to the terminal. In this way, the green light adapter can efficiently receive blue light signals and ensure data integrity and low bit error rate. At the same time, the green light adapter also has the function of data transmission, and can encode the data and transmit it through the LD to form a complete two-way communication system with the blue light adapter.

[0055] This system adopts the OOK (On-Off Keying) modulation technology. This method uses the "on" and "off" states of optical signals to represent binary data, simplifies the modulation and demodulation process, and reduces the system complexity. During data transmission, OOK modulation can ensure high signal stability and adapt to the complex underwater optical environment. In addition, this system combines multiple optimization technologies such as high-efficiency signal processing of FPGA, high-gain photoelectric detection of PMT, and automatic gain control of AGC, making it have the advantages of high bandwidth, low bit error, long distance, and strong anti-interference in the underwater environment, providing an efficient and reliable communication solution for applications such as underwater sensor data transmission, AUV communication, and ocean exploration.

[0056] As Figure 2 shown, a communication method based on an underwater blue-green light adapter provided by an embodiment of the present invention includes:

[0057] S101, by using a high-speed FPGA: internally cache the received and converted data, encode the data using an 8B / 10B encoder, and then output an LVTTL level signal to the signal driving module after serial-to-parallel conversion;

[0058] S102, through the signal conversion module: convert the weak current signal into an LVTTL level signal that can be processed by the FPGA, and the communication dynamic range can be ≥30dB; through the signal driving module: load the LVTTL level signal onto the LD light source through a constant current source and a modulation source and emit it;

[0059] S103, through the PMT: a photoelectric conversion device, convert the optical signal into a weak current signal; through the condenser lens: play a role in condensing light, and focus the weak light signal within the receiving aperture; through the filter: filter out the influence of its own light source and other natural light sources;

[0060] S104, through the LD: an electro-optical conversion device, convert the level signal into an optical signal and emit it;

[0061] S105. Through the transmitting optics: The narrow-beam LD light source is shaped into a uniform large spot by using a combination lens to ensure a good channel under conditions such as water turbulence.

[0062] The present invention proposes a communication method based on an underwater blue-green light connector, aiming to solve the problems of serious attenuation of optical communication signals, limited dynamic range, and insufficient signal modulation and reception stability in the underwater environment. This method uses FPGA high-speed processing, signal conversion and driving modules, optoelectronic conversion modules, and optical shaping technology to achieve efficient data transmission and stable communication. In the system architecture, the FPGA undertakes the tasks of data caching, encoding, and signal output. Combining with the advanced 8B / 10B encoding mechanism, it improves the error resistance of data and ensures the high reliability of the communication link. At the same time, the FPGA outputs the data in the form of LVTTL level signals through the parallel-serial conversion technology, providing a standardized interface for subsequent signal modulation and driving.

[0063] To enhance the adaptability of the signal in the complex underwater environment, the present invention designs a signal conversion and driving module to ensure the stable transmission of the signal. The signal conversion module converts the weak current signal into an LVTTL level signal that can be processed by the FPGA and optimizes the dynamic range of the communication link to more than 30 dB to adapt to the interference caused by water turbulence, light absorption, and scattering. At the same time, the signal driving module uses a combination of a constant current source and a modulation source to maintain a constant optical power during the process of driving the light source, ensuring the emission stability of the LD (laser diode) light source. This design can effectively reduce signal distortion, improve the penetration ability of the signal in the underwater optical communication channel, and improve the communication efficiency and stability of the system.

[0064] At the receiving end of the optical signal, the present invention uses a high-sensitivity optoelectronic conversion module to enhance the ability to capture weak signals. This module includes a PMT (photomultiplier tube) that can convert the underwater optical signal into a weak current signal and focuses the optical signal within the receiving aperture through a condenser lens to increase the incident optical power of the signal. In addition, to eliminate the interference of ambient light, the system introduces a filter that can accurately filter out natural light and stray light outside the working wavelength range, thereby improving the signal-to-noise ratio (SNR) of the optical signal. This optical design greatly improves the detection ability of the system for long-distance and low-intensity optical signals, making the blue-green light communication more applicable in the complex underwater environment.

[0065] At the transmitting end of the optical signal, the present invention uses an LD (laser diode) as the electro-optical conversion device, which is responsible for converting the modulated electrical signal into an optical signal for underwater transmission. When the LD light source emits light, it is controlled by a constant current drive system to ensure the stability of the optical output and reduce the impact of laser intensity fluctuations on the communication quality. By adopting an efficient modulation method, the LD light source can achieve a higher signal bandwidth while reducing power consumption. In addition, in order to improve the transmission efficiency of blue-green light in water, the transmitting end combines a specific wavelength optimization strategy, selects the wavelength of the low-absorption window of water (450 - 550 nm), and further improves the transmission distance and stability of the optical signal.

[0066] Aiming at water turbulence, light scattering and diffraction effects, the present invention proposes an emission optical shaping method, which uses a combination lens group to shape the narrow beam laser emitted by the LD light source into a uniform large spot, improving the coverage range and stability of the light beam in water. This optical optimization scheme can effectively reduce the random scattering loss of the light beam caused by water flow disturbance, enabling the optical communication link to maintain a stable transmission quality in a dynamic water environment. Through this technical optimization, the communication system can maintain a high signal-to-noise ratio (SNR) under different depths and water flow conditions, and is suitable for long-distance underwater data transmission and high-precision underwater target communication.

[0067] The present invention also provides a computer device, a computer-readable storage medium and an information data processing terminal based on this communication method, enabling this communication technology to be applied to a variety of underwater intelligent systems. The computer device includes a memory and a processor, where the memory stores the corresponding computer program, and this program can be executed by the processor to complete the intelligent data processing of the blue-green light communication link. The computer-readable storage medium can store this computer program to make it run in different underwater intelligent systems, realizing the wide application of the communication method. The information data processing terminal can integrate this method to realize various functions such as underwater sensing, remote communication, ocean monitoring and underwater robot interaction, improving the efficiency and stability of underwater information transmission.

[0068] As Figure 3 shown in this example, the device of the present invention includes an integrated board 1 (including a high-speed FPGA, a signal conversion module, a signal drive module), a receiving end 2 (including a PMT, a lens), a filter 3, an LD 4, and an emission optics 5.

[0069] The high-speed FPGA master core is XC7A100T-2FGG676I, which has sufficient bit conversion density. After the bitstream signal is smoothed and filtered, clock data recovery technology is used to recover the clock according to the transition edges of the data. Using this method, high synchronization between the clock and the data can be maintained, and the signal can still be recovered well even above 100 Mbps. The recovered synchronous clock is further subjected to parallel-to-serial conversion and decoding, and then sent to the packet assembly module. The signal conversion master chips are OPA855IDSGR and VCA810AID, which have an 8 GHz bandwidth and a low input voltage noise of 0.98 nV, and there is still a large redundancy even when the signal is at 100 Mbps. The signal driving master chip is MAX3949ETE+T, which has characteristics such as high speed and large current, and can drive high-power LDs to have stronger penetration in water. The PMT model is Hamamatsu H16201-40, whose peak wavelength band is 520 nm and is suitable for underwater blue-green light communication. The condenser lens is the Thorlabs ACL3026U aspheric lens, which can make the light rays parallel to the optical axis focus more evenly on a point, reducing the scattering and reflection losses of the light rays in the optical system. The filter model is the high cut-off depth and high transmittance NP525 and NP450, which can cut off the interference of ambient light. The LD models are OSRAM PLT5-520B and PLT5-450GB, which have large emission powers of 80 mW and 110 mW respectively. The transmitting front end is a combined lens, and a multi-lens combination is used to diverge and emit the narrow beam laser into the water.

[0070] As Figure 4 , 5 shown, the underwater blue-green light connector communication device of the present invention uses a high-speed FPGA and a high-power LD (laser diode) for data transmission. The data source is first sent to the high-speed FPGA inside the device through the terminal device. The FPGA modulates the data at a rate of 100 Mbps and drives the high-power LD to emit the optical signal in the form of blue-green light into the water. The optical signal in the water propagates optically to the receiving end, is captured by the PMT (photomultiplier tube), and converted into a weak current signal. Since the underwater optical signal may have amplitude fluctuations due to the influence of the water body environment, the signal conversion module has built-in automatic gain control (AGC) to ensure that the communication dynamic range ≥ 30 dB. Finally, the shaped LVTTL signal is restored to the FPGA for data processing and transmitted to the terminal to achieve stable data reception and decoding.

[0071] As Figure 6As shown in the figure, the present device can be used in an underwater distributed sensor network to enhance underwater data communication capabilities. In an application case, the underwater blue light adapter is fixed to an underwater sensor platform, while the underwater green light adapter is installed on an AUV (Autonomous Underwater Vehicle), forming a one-to-many data interaction system. When the AUV performs a cruising mission, it will move to the vicinity of each sensor node in turn and establish a short-range high-speed communication link with the blue light adapter on the sensor platform using the green light communication adapter. Through this link, the AUV can accurately collect environmental data of the underwater sensors, such as temperature, salinity, oxygen content, video images, etc., and store the data in the internal storage system.

[0072] After the AUV has completed data collection from all underwater sensor nodes, it will return to the mother ship with the stored data. After approaching the mother ship, the AUV uses the green light adapter to establish a communication link with the blue light adapter on the mother ship. At this time, the data stored inside the AUV is transmitted to the receiving end on the mother ship through the underwater green light signal, and then the mother ship transmits the data to the ground terminal or cloud server through a wired or wireless network for storage and analysis. This method eliminates the need for the AUV to return to the mother ship every time it finishes collecting data, greatly improving the efficiency of data collection. At the same time, it reduces the energy consumption of the AUV due to frequent returns to the mother ship during long-term operations, achieving efficient and low-power underwater data transmission.

[0073] The underwater blue-green light communication system of the present invention overcomes the defects of traditional acoustic communication, such as low bandwidth, large latency, and susceptibility to noise interference. Moreover, compared with radio wave communication, blue-green light communication can achieve a longer propagation distance and a more stable data transmission rate in water. In addition, this system can be applied to various scenarios such as deep-sea environmental monitoring, remote control of underwater equipment, AUV collaborative operations, seabed resource exploration, and military reconnaissance, and is suitable for short-range high-bandwidth underwater communication. Through the collaborative optimization of FPGA intelligent signal processing, automatic gain control (AGC), and a high-power LD emission system, the system can still maintain a low bit error rate and stable data transmission in a complex underwater environment, greatly enhancing the reliability and adaptability of underwater communication.

[0074] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A communication device based on an underwater blue-green light connector, characterized in that: The underwater blue-green light connector communication device comprises: Blue light connector, green light connector; Laser is used as a communication carrier, and the binary data stream is loaded onto the laser and sent to the PMT. The PMT converts and demodulates the received laser signal and outputs it to the user terminal. The underwater blue light connector includes high-speed FPGA, signal conversion module, signal drive module, PMT, focusing lens, filter, LD, and emission optics; The blue light connector uses blue light LD and NP525 filter, and the green light connector uses green light LD and NP450 filter. Among them, the high-speed FPGA: internally caches the converted data received, encodes the data using an 8B / 10B encoder, and outputs an LVTTL level signal to the signal driver module after parallel-to-serial conversion; Signal conversion module: converts weak current signals into LVTTL level signals that can be processed by FPGA, and can make the communication dynamic range ≥30dB; Signal driving module: The LVTTL level signal is loaded onto the LD light source through a constant current source and a modulation source.

2. The underwater blue-green light connector communication device according to claim 1, characterized in that: The PMT is a photoelectric conversion device that converts light signals into weak current signals.

3. The underwater blue-green light connector communication device according to claim 1, characterized in that: The condenser lens plays a condensing role to focus the weak light signal within the receiving aperture.

4. The underwater blue-green light connector communication device according to claim 1, characterized in that: The filter is used to filter out the influence of its own light source and other natural light sources.

5. The underwater blue-green light connector communication device according to claim 1, characterized in that: The LD is an electro-optical conversion device that converts a level signal into an optical signal for transmission.

6. The underwater blue-green light connector communication device according to claim 1, characterized in that: The emission optics: a combination lens is used to shape the narrow beam LD light source into a uniform large light spot, ensuring a good channel under conditions such as water turbulence.

7. A method for underwater blue-green light connector communication based on the underwater blue-green light connector communication device according to any one of claims 1 to 6, characterized in that: The underwater blue-green light connector communication method includes: Step 1, by using a high-speed FPGA: internally cache the received converted data, encode the data using an 8B / 10B encoder, and output the LVTTL level signal to the signal driver module after parallel-to-serial conversion; Step 2: Through the signal conversion module: convert the weak current signal into an LVTTL level signal that can be processed by the FPGA, and make the communication dynamic range ≥30dB; through the signal driving module: load the LVTTL level signal to the LD light source through the constant current source and the modulation source; Step 3: Use PMT (photoelectric conversion device) to convert the optical signal into a weak current signal; use a focusing lens to focus the weak light signal within the receiving aperture; use a filter to filter out the influence of the light source itself and other natural light sources; Step 4, through LD: electro-optical conversion device, convert the level signal into an optical signal and send it out; Step 5, through emission optics: a combination lens is used to shape the narrow beam LD light source into a uniform large light spot to ensure a good channel under conditions such as water turbulence.

8. A computer device, characterized in that: The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the underwater blue-green light connector communication method as described in claim 7.

9. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor executes the steps of the underwater blue-green light connector communication method according to claim 7.

10. An information data processing terminal, characterized in that: The information data processing terminal is used to implement the underwater blue-green light connector-based communication device as described in any one of claims 1-6.

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