CN112737691A - Underwater wireless optical communication receiving method and device based on gain control in detector - Google Patents
Underwater wireless optical communication receiving method and device based on gain control in detector Download PDFInfo
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- CN112737691A CN112737691A CN202011367374.9A CN202011367374A CN112737691A CN 112737691 A CN112737691 A CN 112737691A CN 202011367374 A CN202011367374 A CN 202011367374A CN 112737691 A CN112737691 A CN 112737691A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/2931—Signal power control using AGC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
Abstract
The invention relates to an underwater wireless optical communication receiving method and device based on gain control in a detector, wherein the method comprises the following steps: s1: converting the received communication optical signal into a communication current signal by using a photomultiplier; s2: converting the communication current signal into a communication voltage signal; s3: generating direct current voltage according to the communication voltage signal, and controlling the internal gain change of the photomultiplier by using the direct current voltage so as to control the change of the amplitude value of the communication voltage signal and realize the increase of the receiving optical power range of the receiving device; wherein the communication voltage signal is used as an electrical signal for subsequent processing by the receiving device. The method realizes the detection of different optical power signals by controlling the internal gain of the photomultiplier through the direct current voltage, increases the receiving optical power range of the receiving device, and can realize quick response aiming at the signals with different optical powers.
Description
Technical Field
The invention belongs to the technical field of underwater wireless communication, and particularly relates to an underwater wireless optical communication receiving method and device based on gain control in a detector.
Background
The wireless communication technology is of great importance in the field of underwater communication, and efficient data transmission is required no matter the return of submarine monitoring data or the information interaction between underwater mobile platforms. The underwater wireless optical communication using blue-green light waves as information carriers has the outstanding advantages of high transmission rate, low delay, light weight, small volume power consumption and the like, has wide application prospect in the field of near-distance underwater wireless transmission, and has become an important development direction of ocean communication.
In practical application, the power of the communication optical signal reaching the underwater communication receiver is greatly influenced by the communication transmission distance and the optical attenuation property of seawater. This will result in variations in the power of the optical signal arriving at the receiver under different operating conditions. For a communication optical signal with low optical power, a receiver needs to have sufficient sensitivity to realize effective detection of the optical signal; when the power of the communication optical signal exceeds the rated working range of the photoelectric detector in the receiver, the detection accuracy of the optical signal is influenced slightly, and the photoelectric detector is damaged seriously. Therefore, the underwater wireless optical communication receiver needs to have a larger optical power receiving range.
In the related art, in order to increase the receiving optical power range of the underwater communication receiver, a variable attenuator is usually disposed in front of the photodetector inside the receiver, and the optical power reaching the photodetector is adjusted by adjusting the transmittance of the variable attenuator, so that the detector can operate in an optimal state. Common variable attenuators include mechanical optical attenuators, MEMS optical attenuators, magneto-optical attenuators, thermo-optical attenuators, liquid crystal attenuators, and the like. However, the presence of a variable attenuator can increase the size, weight and complexity of the receiver, making the use of the device inconvenient. In addition, the presence of a variable attenuator may reduce the field of view of the receiver to some extent, which may increase the alignment requirements of the transmitter and receiver during communication.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an underwater wireless optical communication receiving method and device based on gain control in a detector. The technical problem to be solved by the invention is realized by the following technical scheme:
the invention provides an underwater wireless optical communication receiving method based on gain control in a detector, which comprises the following steps:
s1: converting the received communication optical signal into a communication current signal by using a photomultiplier;
s2: converting the communication current signal to a communication voltage signal;
s3: generating direct current voltage according to the communication voltage signal, and controlling the internal gain change of the photomultiplier by using the direct current voltage so as to control the amplitude change of the communication voltage signal and realize the increase of the receiving optical power range of the receiving device;
wherein the communication voltage signal is used as an electrical signal for subsequent processing by the receiving device.
In an embodiment of the present invention, the S3 includes:
s31: judging the size of the communication voltage signal and a preset voltage range;
s32: generating the direct current voltage according to a judgment result, if the communication voltage signal is smaller than the preset voltage range, increasing the direct current voltage, if the communication voltage signal is larger than the preset voltage range, reducing the direct current voltage, and if the communication voltage signal is within the preset voltage range, keeping the direct current voltage unchanged;
s33: and controlling the internal gain change of the photomultiplier according to the direct-current voltage so as to control the magnitude of the communication current signal, so that the communication voltage signal is positioned in the preset voltage range, and the received optical power range of the receiving device is enlarged.
The invention also provides an underwater wireless optical communication receiving device based on the gain control in the detector, which is characterized by comprising:
the photomultiplier is used for converting the communication optical signal into a communication current signal;
an amplifier for converting the communication current signal to a communication voltage signal;
and the gain control module is used for generating direct current voltage according to the communication voltage signal and controlling the internal gain change of the photomultiplier by using the direct current voltage so as to control the amplitude change of the communication voltage signal and realize the increase of the receiving optical power range of the receiving device.
In one embodiment of the invention, the gain control module comprises:
the comparison and judgment unit is used for judging the size of the communication voltage signal and a preset voltage range;
the direct-current voltage generating unit is used for generating the direct-current voltage according to a judgment result, increasing the direct-current voltage if the communication voltage signal is smaller than the preset voltage range, reducing the direct-current voltage if the communication voltage signal is larger than the preset voltage range, and keeping the direct-current voltage unchanged if the communication voltage signal is within the preset voltage range;
and the control unit is used for controlling the internal gain change of the photomultiplier according to the direct-current voltage so as to control the magnitude of the communication current signal, so that the communication voltage signal is positioned in the preset voltage range, and the received optical power range of the receiving device is enlarged.
In an embodiment of the present invention, the underwater wireless optical communication receiving apparatus further includes a receiving module, configured to receive the communication optical signal, where the communication optical signal carries communication data information.
In an embodiment of the present invention, the underwater wireless optical communication receiving apparatus further includes a signal processing module, configured to decode the communication voltage signal to obtain the communication data information.
Compared with the prior art, the invention has the beneficial effects that:
1. the underwater wireless optical communication receiving method based on the gain control in the detector realizes the detection of different optical power signals by a method of controlling the internal gain of the photomultiplier through direct current voltage, enlarges the receiving optical power range of a receiving device, and can realize quick response aiming at the signals with different optical powers.
2. The underwater wireless optical communication receiving device based on the gain control in the detector can receive signals with large dynamic change of optical power without adding a variable attenuation sheet, and has the advantages of simple structure, low complexity and convenient popularization and application.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the operating principle of a photomultiplier according to an embodiment of the present invention;
fig. 2 is a flowchart of an underwater wireless optical communication receiving method based on in-detector gain control according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an underwater wireless optical communication receiving device based on gain control in a detector according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a simulation experiment apparatus of an underwater wireless optical communication receiving method based on gain control in a detector according to an embodiment of the present invention.
Icon: 1-a photomultiplier tube; 2-an amplifier; 3-a gain control module; 301-a comparison and judgment unit; 302-a direct voltage generating unit; 303-a control unit; 4-a receiving module; and 5, a signal processing module.
Detailed Description
In order to further explain the technical means and effects of the present invention adopted to achieve the predetermined invention, the following will explain in detail an underwater wireless optical communication receiving method and device based on gain control in a detector according to the present invention with reference to the accompanying drawings and the detailed description.
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. The technical means and effects of the present invention adopted to achieve the predetermined purpose can be more deeply and specifically understood through the description of the specific embodiments, however, the attached drawings are provided for reference and description only and are not used for limiting the technical scheme of the present invention.
Example one
Firstly, the working principle of a Photomultiplier device is explained, the Photomultiplier device (PMT) can convert an optical signal into an electrical signal, is a high-sensitivity photoelectric detection device, is often used in an underwater wireless optical communication receiver, and converts an optical signal received by the receiver into an electrical signal. Referring to fig. 1, fig. 1 is a schematic diagram of the operation principle of the photomultiplier according to the embodiment of the present invention. As shown in the figure, the photomultiplier tube mainly includes a photoemission cathode (photocathode), an electron multiplication dynode, an electron collector (anode), and the like. When light is irradiated to the photocathode, the photocathode excites photoelectrons into a vacuum. The photoelectrons enter a multiplication system under the action of an external electric field, and the photoelectrons are multiplied and amplified by secondary emission of dynodes. The amplified electrons are then collected by an anode as a signal output. When the photomultiplier tube is operated in the linear operating region, the current signal output by the anode is proportional to the cathode input light signal power, and the proportionality coefficient is related to the dc voltage applied between the anode and the cathode. The larger the direct current voltage is, the larger the proportionality coefficient is, and the higher the detection sensitivity of the photomultiplier tube is. Therefore, the gain factor of electrons can be changed by using the voltage loaded between the anode and the cathode of the photomultiplier as a control signal, and the detection sensitivity of the device can be adjusted. The higher the voltage between the anode and the cathode, the higher the detection sensitivity of the device, and in communication, the detector can be adapted to different optical signal powers by changing the sensitivity of the photomultiplier.
Referring to fig. 2, fig. 2 is a flowchart of an underwater wireless optical communication receiving method based on gain control in a detector according to an embodiment of the present invention. As shown in the figure, the underwater wireless optical communication receiving method of the embodiment includes:
s1: converting the received communication optical signal into a communication current signal by using a photomultiplier;
s2: converting the communication current signal into a communication voltage signal;
s3: and generating direct current voltage according to the communication voltage signal, and controlling the internal gain change of the photomultiplier by using the direct current voltage so as to control the amplitude change of the communication voltage signal and realize the increase of the receiving optical power range of the receiving device.
In this embodiment, the communication optical signal is specifically an optical signal whose carrier is blue-green light, and includes communication data information, and the communication voltage signal is used as an electrical signal for subsequent processing by the receiving device. It is understood that the communication voltage signal is an electrical signal corresponding to the received communication optical signal.
Further, S3 includes:
s31: judging the size of the communication voltage signal and a preset voltage range;
s32: generating direct current voltage according to the judgment result, if the communication voltage signal is smaller than the preset voltage range, increasing the direct current voltage, if the communication voltage signal is larger than the preset voltage range, reducing the direct current voltage, and if the communication voltage signal is within the preset voltage range, keeping the direct current voltage unchanged;
s33: the internal gain change of the photomultiplier is controlled according to the direct-current voltage so as to control the magnitude of the communication current signal, so that the communication voltage signal is positioned in a preset voltage range, and the received optical power range of the receiving device is enlarged.
In this embodiment, optionally, the preset voltage range is a rated operating voltage range of the underwater wireless optical communication receiving device.
In the present embodiment, the internal gain of the photomultiplier is determined by the dc voltage applied between the anode and the cathode inside the photomultiplier, and the higher the voltage, the greater the sensitivity, the stronger the output current signal at the same optical power. By controlling the direct current voltage between the anode and the cathode, the magnitude of the current signal output by the photomultiplier tube can be controlled. The direct current voltage between the anode and the cathode of the photomultiplier is generated according to the amplitude of the output communication voltage signal, and when the communication voltage signal is larger than the rated working voltage range of the underwater wireless optical communication receiving device, the direct current voltage is reduced; when the communication voltage signal is smaller than the rated working voltage range of the underwater wireless optical communication receiving device, increasing direct current voltage; otherwise, the DC voltage is kept unchanged. The voltage of the output communication electrical signal is maintained within the rated operating voltage range through the adjustment. The method and the device prevent the influence on the detection accuracy of the signal or the damage of the photoelectric detector when the power of the communication optical signal is lower than or exceeds the rated working range of the photoelectric detector in the underwater wireless optical communication receiving device, thereby realizing the increase of the receiving optical power range of the underwater wireless optical communication receiving device.
According to the underwater wireless optical communication receiving method based on the gain control in the detector, different optical power signals are detected by a method of controlling the internal gain of the photomultiplier through direct current voltage, the receiving optical power range of the receiving device is enlarged, and quick response can be realized for the signals with different optical powers.
Further, the present embodiment also provides an underwater wireless optical communication receiving apparatus based on gain control in a detector, please refer to fig. 3, and fig. 3 is a schematic structural diagram of an underwater wireless optical communication receiving apparatus based on gain control in a detector according to an embodiment of the present invention. As shown in the figure, the underwater wireless optical communication receiving apparatus of the present embodiment includes: photomultiplier 1, amplifier 2 and gain control module 3. The photomultiplier 1 is used for converting a communication optical signal into a communication current signal; the amplifier 2 is used for converting the communication current signal into a communication voltage signal; the gain control module 3 is configured to generate a dc voltage according to the communication voltage signal, and control an internal gain change of the photomultiplier tube by using the dc voltage to control an amplitude change of the communication voltage signal, thereby increasing a received optical power range of the receiving apparatus.
Specifically, the gain control block 3 includes a comparison and judgment unit 301, a direct-current voltage generation unit 302, and a control unit 303. In this embodiment, the comparison and determination unit 301 is configured to determine the magnitude of the communication voltage signal and the preset voltage range; the direct current voltage generating unit 302 is configured to generate a direct current voltage according to the determination result, increase the direct current voltage if the communication voltage signal is smaller than the preset voltage range, decrease the direct current voltage if the communication voltage signal is larger than the preset voltage range, and keep the direct current voltage unchanged if the communication voltage signal is within the preset voltage range; the control unit 303 is configured to control an internal gain variation of the photomultiplier according to the dc voltage to control a magnitude of the communication current signal, so that the communication voltage signal is within a preset voltage range, thereby increasing a received optical power range of the receiving apparatus.
Further, the underwater wireless optical communication receiving device of the embodiment further includes a receiving module 4 and a signal processing module 5, wherein the receiving module 4 is configured to receive a communication optical signal, the communication optical signal carries communication data information, and the signal processing module 5 is configured to decode a communication voltage signal to obtain the communication data information.
In this embodiment, the amplifier 2 is optionally a transimpedance amplifier, and is an electronic device that converts a current signal into a voltage signal. The gain control module 3 may be built by using an FPGA (Field-Programmable Gate Array) and a peripheral hardware circuit of the FPGA, as long as the above functions are implemented, and the specific circuit is not limited. Optionally, the implementation process may be implemented by the following processes:
firstly, collecting the amplitude U of the communication voltage signal1And comparing it with rated working voltage amplitude U0The difference is subtracted to obtain the deviation Δ U between the two:
ΔU＝U1-U0 (1)
then, the direct-current voltage V output by the gain control module is adjusted according to the size of the delta U:
V＝V0-kΔU (2)
v in formula (2)0K is a proportionality coefficient for a preset rated working direct current voltage. Therefore, the output of the direct current voltage can be adjusted through the magnitude of the communication voltage signal, and the gain of the photomultiplier is further controlled.
The receiving module 4 may be a corresponding module in current underwater communication receivers. The signal processing module 5 can be a corresponding module in the existing underwater communication receiver, mainly adopts methods such as equalization, filtering and the like to carry out shaping and processing operations on communication voltage signals, and finally recovers information of a sending end through a clock extraction and judgment circuit and a decoding circuit.
The underwater wireless optical communication receiving device based on the gain control in the detector can receive the signal with large dynamic change of optical power without adding a variable attenuation sheet, and has the advantages of simple structure, low complexity and convenience in popularization and application.
Further, a simulation experiment is performed on the underwater wireless optical communication receiving method based on the gain control in the detector according to the embodiment of the present invention, specifically, please refer to fig. 4, where fig. 4 is a schematic diagram of a simulation experiment apparatus of the underwater wireless optical communication receiving method based on the gain control in the detector according to the embodiment of the present invention. As shown in the figure, the first and second,
firstly, a group of Pseudo-Random Binary sequences (PRBS) is generated by an error code detector and used for simulating communication data information, and the PRBS Sequence is used for controlling an optical signal output by a blue-green optical communication transmitter. The modulation format of the optical signal is On-off keying (OOK): when the PRBS sequence is logic '1', the communication transmitter has optical signal output; when the PRBS sequence is logic "0", the communication transmitter has no optical signal output. Thus, the communication data can be characterized by the presence or absence of the optical signal. In the embodiment, the light source is a laser diode with a blue light band with a central wavelength of 450nm, and the electric signal output by the error code meter is converted into an optical signal in a direct modulation mode. The optical signal is used as a communication optical signal which needs to be received by an optical communication receiver
Then, the communication optical signal passes through the water tank and the adjustable attenuator and then reaches the optical communication receiver. Wherein the water tank is used for simulating the transmission of light in water, and the adjustable attenuator is used for simulating the power change of an optical signal reaching the optical communication receiver.
And finally, the optical communication receiver carries out photoelectric detection on the communication optical signal, original communication data information, namely logic '1' and logic '0', is recovered from the voltage signal after photoelectric conversion by using a decision circuit, and the received logic data and the transmitted logic data are compared one by using an error code meter to test the error rate of the communication system.
The optical communication receiver is the underwater wireless optical communication receiving device of the above embodiment, and includes a photomultiplier tube 1, an amplifier 2, a gain control module 3, a receiving module 4, and a signal processing module 5. First, the receiving module 4 receives the communication optical signal passing through the water tank and the variable attenuation thereof, and converts the communication optical signal into a communication current signal by the photomultiplier tube 1. Then, the communication current signal is converted into a communication voltage signal through the amplifier 2, the amplifier 2 is a transimpedance amplifier, the communication voltage signal output by the transimpedance amplifier is divided into two paths, one path is input into the gain control module 3, and the other path is input into the signal processing module 5. Secondly, the gain control module 3 generates a direct current voltage to control the internal gain of the photomultiplier tube 1 according to the amplitude of the communication voltage signal output by the transimpedance amplifier. The gain control circuit is built by using the FPGA and peripheral hardware circuits of the FPGA, and reduces the output of direct-current voltage when the amplitude is larger than the rated working voltage range; and when the amplitude is smaller than the rated working voltage range, the output of the direct current voltage is increased, and when the amplitude is within the rated working voltage range, the output of the direct current voltage is kept unchanged. Finally, the signal processing module 5 recovers the original communication data information from the voltage signal after the photoelectric conversion by using a decision circuit.
In a specific experimental process, the signal rate output by the error code meter is set to be 20Mbps, and when the amplitude of the output signal of the transimpedance amplifier is 800mV, the rated working range of the optical communication receiver is set. When the amplitude of the voltage signal output by the transimpedance amplifier is greater than 800mV, the direct-current voltage output by the gain control module 3 is reduced; when the amplitude of the output voltage signal of the transimpedance amplifier is smaller than 800mV, the direct current voltage output by the gain control module 3 is increased; otherwise, the gain control module 3 outputs the dc voltage unchanged.
The optical power reaching the optical communication receiver is controlled by the variable attenuator, and the direct current voltage output by the gain control module 3 is set according to the amplitude value output by the trans-impedance amplifier. The bit error rate was counted in units of 1 minute, and after a large number of tests were performed, the test results are shown in table 1.
TABLE 1 simulation test results
| Serial number | Sensitivity of arrival detector | Control | Error rate | |
| 1 | 0.07μW～117.72μW | 320V～490V | 0 | |
| 2 | 0.023μW | 600V | 2.83E-8 | |
| 3 | 0.020μW | 700V | 1.62E-7 | |
| 4 | 0.017μW | 800V | 2.87E-7 | |
| 5 | 0.015μW | 850V | 3.30E-6 | |
| 6 | 0.008μW | 900V | 1.57E-5 |
As can be seen from the table: by changing the control voltage of the photomultiplier tube 1, the optical communication receiver can adapt to different optical powers, and the optical communication receiver can adapt to the optical signal power change in the range of 0.008 muW-117.72 muW. In the process, the sensitivity of the photomultiplier 1 can be adjusted at a speed of milliseconds.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. An underwater wireless optical communication receiving method based on gain control in a detector is characterized by comprising the following steps:
s1: converting the received communication optical signal into a communication current signal by using a photomultiplier;
s2: converting the communication current signal to a communication voltage signal;
s3: generating direct current voltage according to the communication voltage signal, and controlling the internal gain change of the photomultiplier by using the direct current voltage so as to control the amplitude change of the communication voltage signal and realize the increase of the receiving optical power range of the receiving device;
wherein the communication voltage signal is used as an electrical signal for subsequent processing by the receiving device.
2. The method according to claim 1, wherein the S3 includes:
s31: judging the size of the communication voltage signal and a preset voltage range;
s32: generating the direct current voltage according to a judgment result, if the communication voltage signal is smaller than the preset voltage range, increasing the direct current voltage, if the communication voltage signal is larger than the preset voltage range, reducing the direct current voltage, and if the communication voltage signal is within the preset voltage range, keeping the direct current voltage unchanged;
s33: and controlling the internal gain change of the photomultiplier according to the direct-current voltage so as to control the magnitude of the communication current signal, so that the communication voltage signal is positioned in the preset voltage range, and the received optical power range of the receiving device is enlarged.
3. An underwater wireless optical communication receiving device based on gain control in a detector is characterized by comprising:
the photomultiplier is used for converting the communication optical signal into a communication current signal;
an amplifier for converting the communication current signal to a communication voltage signal;
and the gain control module is used for generating direct current voltage according to the communication voltage signal and controlling the internal gain change of the photomultiplier by using the direct current voltage so as to control the amplitude change of the communication voltage signal and realize the increase of the receiving optical power range of the receiving device.
4. The underwater wireless optical communication receiving apparatus as claimed in claim 3, wherein the gain control module comprises:
the comparison and judgment unit is used for judging the size of the communication voltage signal and a preset voltage range;
the direct-current voltage generating unit is used for generating the direct-current voltage according to a judgment result, increasing the direct-current voltage if the communication voltage signal is smaller than the preset voltage range, reducing the direct-current voltage if the communication voltage signal is larger than the preset voltage range, and keeping the direct-current voltage unchanged if the communication voltage signal is within the preset voltage range;
and the control unit is used for controlling the internal gain change of the photomultiplier according to the direct-current voltage so as to control the magnitude of the communication current signal, so that the communication voltage signal is positioned in the preset voltage range, and the received optical power range of the receiving device is enlarged.
5. The underwater wireless optical communication receiving device according to claim 3, further comprising a receiving module for receiving the communication optical signal, wherein the communication optical signal carries communication data information.
6. The underwater wireless optical communication receiving device of claim 5, further comprising a signal processing module, configured to decode the communication voltage signal to obtain the communication data information.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105680941A (en) * | 2016-02-26 | 2016-06-15 | 中国科学技术大学 | Underwater LED (Light-Emitting Diode) long distance communication system based on visible light |
| US20200028596A1 (en) * | 2013-03-15 | 2020-01-23 | Fairfield Industries Incorporated | High-bandwidth underwater data communication system |
| CN111431624A (en) * | 2020-06-09 | 2020-07-17 | 北京赛博融合信息技术有限公司 | Underwater wireless optical communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200028596A1 (en) * | 2013-03-15 | 2020-01-23 | Fairfield Industries Incorporated | High-bandwidth underwater data communication system |
| CN105680941A (en) * | 2016-02-26 | 2016-06-15 | 中国科学技术大学 | Underwater LED (Light-Emitting Diode) long distance communication system based on visible light |
| CN111431624A (en) * | 2020-06-09 | 2020-07-17 | 北京赛博融合信息技术有限公司 | Underwater wireless optical communication system |
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