An energy adaptive regulation device and method for underwater wireless optical communication

Abstract

This invention provides an energy adaptive adjustment device and method for underwater wireless optical communication, relating to the field of underwater wireless optical communication. The device includes: an adaptive adjustment module, a signal processing module, an optical antenna, a tunable optical attenuator, and a beam splitter. The tunable optical attenuator adjusts the light intensity energy of the optical signal according to the feedback signal from the adaptive adjustment module. The beam splitter splits the optical signal output from the tunable optical attenuator into two paths, one transmitted to the adaptive adjustment module and the other to the signal processing module. The signal processing module generates an energy calibration result and sends it to the adaptive adjustment module, and receives the optical signal from the beam splitter, processes it, and outputs it. The adaptive adjustment module receives the signals from the beam splitter and the signal processing module, processes them, and feeds them back to the tunable optical attenuator. This invention solves the problem that the signal energy detected by the receiving end of the device cannot be adaptively adjusted, improving the practicality and robustness of the communication device.

Description

Technical Field

[0001] This invention relates to the field of underwater wireless optical communication, and more particularly to an energy adaptive adjustment device and method for underwater wireless optical communication. Background Technology

[0002] The development and utilization of marine resources cannot be separated from the acquisition and transmission of marine data. With the support of underwater communication technology, the construction of underwater networks can realize the Internet of Things (IoT) communication of marine observation sensors, such as IoT interconnection and information feedback, ultra-high-speed non-contact data communication between underwater sports equipment and targets such as surface ships and communication buoys, underwater vehicle cluster and formation networking communication, and submarine optical cable and underwater wireless convergence networking.

[0003] Currently, underwater communication methods include wired and wireless. Underwater wired communication carries over 90% of global data transmission, primarily using optical fiber as the transmission medium. It boasts advantages such as large transmission capacity, low transmission loss, high communication quality, wide bandwidth, long transmission distance, and resistance to electromagnetic interference. However, because wired communication requires a physical medium, it severely restricts the flexibility of dynamic communication networks for underwater vehicles and sensors, making it unsuitable for underwater environments. Underwater wireless communication methods mainly include ultra-low frequency (ULF / VLF / ELF) wireless communication, underwater acoustic communication, and wireless optical communication. Among these, wireless optical communication has become a research hotspot in underwater communication in recent years due to its advantages such as low cost, high transmission rate, security, anti-interference, anti-interception, and low power consumption.

[0004] Underwater wireless optical communication technology can be applied to various scenarios such as submarines, underwater unmanned vehicles, divers, and seabed observation networks. To increase the underwater communication range, photodetectors with high communication sensitivity, such as photomultiplier tubes, are typically used.

[0005] However, because the working distance and water attenuation characteristics change constantly, the energy of the signal detected by the receiver cannot be adaptively adjusted and fluctuates within a wide range. In particular, when the energy is too high, it can cause detector saturation or even damage, thus affecting communication performance. Therefore, underwater wireless optical communication is currently mostly in the laboratory stage, and the channel conditions and communication distance are relatively fixed, allowing communication only at fixed distances and lacking practicality. Summary of the Invention

[0006] This invention provides an energy adaptive adjustment device and method for underwater wireless optical communication, which solves the problems that the signal energy detected by the receiver of current devices cannot be adaptively adjusted, and that high-sensitivity photodetectors are prone to saturation and damage when exposed to strong light. This greatly improves the working dynamic range of underwater wireless optical communication and enhances the practicality and robustness of the communication device.

[0007] On one hand, the present invention provides an energy adaptive adjustment device for underwater wireless optical communication, the device comprising: an adaptive adjustment module, a signal processing module, and an optical antenna, an adjustable optical attenuator, and a beam splitter arranged sequentially along the optical path direction;

[0008] The adjustable optical attenuator is used to adjust the light intensity energy of the optical signal according to the feedback signal of the adaptive adjustment module;

[0009] The beam splitter is used to split the optical signal output by the adjustable optical attenuator into two paths, one of which is transmitted to the adaptive adjustment module and the other of which is transmitted to the signal processing module.

[0010] The signal processing module is used to generate energy calibration results and send them to the adaptive adjustment module, as well as to receive the optical signal from the beam splitter, process it, and output it.

[0011] The adaptive adjustment module receives signals from the beam splitter and the signal processing module, processes them, and then feeds them back to the adjustable light attenuator.

[0012] Furthermore, the adaptive adjustment module includes the following components connected in sequence:

[0013] An optical power detector is used to measure the optical power value of the optical signal received from the beam splitter and to transmit the optical power value to the power controller.

[0014] A power controller is used to receive the optical power value and the energy calibration result in real time, and adjust the adjustable optical attenuator according to the optical power value and the energy calibration result.

[0015] Furthermore, the signal processing module includes a photodetector, a matched filter circuit, and a main control unit connected in sequence.

[0016] Furthermore, the reflecting surface of the beam splitter is at a 45-degree angle to the incident optical axis of the signal light.

[0017] Furthermore, a photodetector and an optical power detector are positioned at the focal point of the optical antenna.

[0018] Furthermore, the device also includes the following components connected in sequence:

[0019] The laser driving circuit is used to drive the laser to emit calibration light sources of different powers according to the energy calibration instructions generated by the main control unit.

[0020] A laser, the optical axis of which forms a 45-degree angle with the reflecting surface of the beam splitter, is used to emit a calibration light source.

[0021] On the other hand, the present invention also provides an energy adaptive adjustment method for underwater wireless optical communication, which utilizes an energy adaptive adjustment device for underwater wireless optical communication as described in any of the above claims to achieve energy adaptive adjustment, the method comprising:

[0022] Upon receiving the energy calibration command, the calibration light source is turned on, the incident light power is changed to obtain the energy calibration range, and the calibration light source is turned off to complete the calibration.

[0023] Obtain a safe operating range within the energy calibration range;

[0024] During communication, the optical power value output by the optical power detector is monitored in real time, and the voltage value output by the power controller is adjusted to ensure that the optical power value is within the safe operating range.

[0025] Furthermore, if the energy calibration interval is [P1, P2] and the safe operating interval is [P3, P4], then the first endpoint P1, the second endpoint P2, the third endpoint P3 and the fourth endpoint P4 need to satisfy: P1 + P2 = P3 + P4, and P1 < P3 < P4 < P2.

[0026] Furthermore, by adjusting the voltage value output by the power controller, the optical power value is ensured to remain within the safe operating range, including:

[0027] When the optical power value P0 satisfies P0 < P1 or P2 < P0, the adjustment step is increased until the optical power value P0 satisfies P1 ≤ P0 ≤ P2, and then the adjustment step is decreased.

[0028] When P1≤P0≤P3, adjust the power controller to increase the optical power value;

[0029] When P3 < P0 < P4, the optical power value remains unchanged;

[0030] When P4≤P0≤P2, the power controller is adjusted to reduce the optical power value.

[0031] Furthermore, the energy calibration interval [P1, P2] is obtained by:

[0032] By changing the incident light power of the calibration light source, the signal processing module obtains a first voltage value V corresponding to the incident light power. 10 Simultaneously, the adaptive adjustment module obtains the optical power value P0 corresponding to the incident light power.

[0033] Obtain the preset minimum voltage value V during communication. 11 and maximum voltage value V 12 ;

[0034] Let the first voltage value V10 =V 11 The corresponding optical power value P1 is obtained;

[0035] Let the first voltage value V 10 =V 12 The corresponding optical power value P2 is obtained.

[0036] In summary, this invention provides an energy adaptive adjustment device and method for underwater wireless optical communication. Compared with the prior art, the technical solution conceived by this invention can achieve the following beneficial effects:

[0037] On the one hand, this invention, through the addition of an adaptive adjustment module, processes the signals from the beam splitter and signal processing module and feeds them back to the adjustable optical attenuator, thus forming a closed-loop adjustment. This allows the adjustable optical attenuator to adjust the intensity and energy of the signal light according to the feedback signal from the adaptive adjustment module. During communication, the intensity and energy of the signal light can be adaptively adjusted and kept within a safe operating range. This solves the problem of high-sensitivity photodetectors being prone to saturation and susceptible to strong light, greatly improving the dynamic range of the underwater wireless optical communication system. It enables communication not only at both short and long distances but also protects the photodetector from damage by strong light, increasing the practicality of underwater optical technology.

[0038] On the other hand, in response to the complex and ever-changing marine environment, this invention can adaptively control the intensity of the incident light signal according to the real-time changes in the environment and quickly adjust the received light power so that the detector always works at the optimal operating point. It is not only applicable to low-order modulation formats, but can also be applied to high-order modulation formats to improve the communication rate. It has good versatility and high practicality.

[0039] Furthermore, this invention adjusts the link attenuation by monitoring the incident light power in real time, achieving energy-adaptive communication under different environments. It features high integration, strong robustness, and high practicality. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the device structure of an underwater wireless optical communication energy adaptive adjustment device and method provided by the present invention;

[0042] 1-Optical antenna; 2-Tuned light attenuator; 3-Beam splitter prism; 4-Signal processing module; 5-Adaptive adjustment module; 6-Calibration light source module;

[0043] 41-Photodetector; 42-Matched filter circuit; 43-Main control unit;

[0044] 51-Optical power detector; 52-Power controller;

[0045] 61-Laser drive circuit; 62-Laser. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] It should be noted that, in the description of the embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method, step, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to the method, step, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the method, step, or apparatus that includes said element.

[0048] To address the problem that current devices cannot adaptively adjust the signal energy detected by the receiver, this invention provides an energy adaptive adjustment device and method for underwater wireless optical communication, such as... Figure 1 As shown, the device includes an adaptive adjustment module 5, a signal processing module 4, and an optical antenna 1, an adjustable light attenuator 2, and a beam splitter 3 arranged sequentially along the optical path.

[0049] Optical antenna 1 is used to receive optical signals and transmit them to tunable optical attenuator 2.

[0050] It should be noted that optical antenna 1 is a device for transmitting or receiving optical signals in optical communication. It can convert freely propagating electromagnetic wave radiation in the optical frequency band into local energy, enabling the control and manipulation of the optical field at the nanoscale, and is expected to improve the performance and efficiency of optical detection, optical emission, and sensing. Lenses, prisms, and plane mirrors are typically used to control and change the direction, thickness, focusing, and defocusing properties of the light beam. For example, optical antenna 1 can use a Fresnel lens with an 80mm aperture and a focal length of 100mm.

[0051] The adjustable optical attenuator 2 is disposed between the optical antenna 1 and the beam splitter 3 along the optical path direction and is connected to the adaptive adjustment module 5. It is used to receive the optical signal transmitted by the optical antenna 1 and adjust the light intensity energy of the optical signal according to the feedback signal of the adaptive adjustment module 5.

[0052] The adjustable light attenuator 2 is an electronically controlled adjustable light attenuator 2 that changes the attenuation level by inputting different voltage signals.

[0053] As a specific embodiment, the adjustable optical attenuator 2 can be a Meadowlark E23090 electrically controlled adjustable optical attenuator. This attenuator has an input voltage of 0–5V and can adjust the optical attenuation from 0–30dB. Since the higher the input voltage, the greater the attenuation, multiple adjustable attenuators can be connected in series to achieve attenuation adjustment from 0–60dB or even a wider range.

[0054] As a key component, the beam splitter prism 3 splits the optical signal output from the adjustable optical attenuator 2 into two paths: one path is transmitted to the adaptive adjustment module 5, and the other path is transmitted to the signal processing module 4. In other words, the beam splitter prism 3 splits the optical signal into two paths, one of which is received by the adaptive adjustment module 5, and the other is received by the signal processing module 4. Furthermore, the reflecting surface of the beam splitter prism 3 preferably forms a 45-degree angle with the incident optical axis of the signal light.

[0055] For example, beam splitter 3 can be a Thorlabs nonpolarized beam splitter cube, operating at visible light wavelengths with a splitting ratio of 50:50.

[0056] It should be noted that the optical antenna 1, the adjustable optical attenuator 2, and the beam splitter 3 are arranged sequentially along the optical path. The beam splitter 3 splits the optical signal into two paths, one of which is received by the adaptive adjustment module 5, and the other is received by the signal processing module 4. Furthermore, the adaptive adjustment module 5 and the signal processing module 4 are located at the focal point of the optical antenna 1.

[0057] The signal processing module 4 is used to generate energy calibration results and send them to the adaptive adjustment module 5, as well as to receive the optical signals from the beam splitter 3, process them, and then output them.

[0058] As one embodiment, the signal processing module 4 includes a photodetector 41, a matched filter circuit 42, and a main control unit 43 connected in sequence. That is, the output terminal of the photodetector 41 is connected to the input terminal of the matched filter circuit 42, and the output terminal of the matched filter circuit 42 is connected to the input terminal of the main control unit 43. The connection can be made via an RF cable.

[0059] It should be noted that the photodetector 41 has the characteristics of high sensitivity and easy saturation. A mature photomultiplier tube (PMT) or multi-pixel photon counter (MPPC) can be used to convert the received optical signal into an electrical signal, and the waveform is further optimized by the matched filter circuit 42. That is to say, the beam splitter prism 3 splits the optical signal into two paths: one is received by the adaptive adjustment module 5, and the other is received by the photodetector 41 of the signal processing module 4. The photodetector 41 of the signal processing module 4 is placed at the focal point of the optical antenna 1.

[0060] The photodetector 41 is preferably a photomultiplier tube. For example, a Hamamatsu photomultiplier tube of model H10721 can be used, which has the characteristics of high sensitivity, high bandwidth and small size, and is used to convert the received optical signal into an electrical signal.

[0061] The matched filter circuit 42 is used for transimpedance amplification and voltage matching. That is, on the one hand, it uses a transimpedance amplifier with a high gain-bandwidth product to convert the current signal into a voltage signal; on the other hand, it adjusts and converts the voltage signal to match the range of the downstream ADC.

[0062] During the communication phase, the main control unit 43 demodulates and decodes the filtered and amplified electrical signal to recover the original signal. During the energy calibration phase, the main control unit 43 receives or generates energy calibration commands and feeds back the generated energy calibration results to the adaptive adjustment module 5.

[0063] For example, the main control unit 43 can use Xilinx's K7-325T as the core processor. On the one hand, it is equipped with a 12-bit high-speed AD conversion chip AD9434 for acquiring the original waveform; on the other hand, it is equipped with a medium-low speed AD conversion chip for acquiring and calculating the average voltage of the electrical signal output by the matched filter circuit 42.

[0064] The adaptive adjustment module 5 receives signals from the beam splitter 3 and the signal processing module 4, processes them, and then feeds them back to the adjustable light attenuator 2.

[0065] As one embodiment, the adaptive adjustment module 5 includes an optical power detector 51 and a power controller 52 connected in sequence. That is, the output terminal of the optical power detector 51 is connected to the input terminal of the power controller 52, and the output terminal of the power controller 52 is connected to the input terminal of the adjustable optical attenuator 2. The connection can be made via an RF cable.

[0066] The optical power detector 51 measures the optical power value of the optical signal transmitted by the beam splitter and transmits the optical power value to the power controller 52. In other words, the beam splitter 3 splits the optical signal into two paths, one of which is received by the signal processing module 4, and the other is received by the optical power detector 51 of the adaptive adjustment module 5. The optical power detector 51 of the adaptive adjustment module 5 is placed at the focal point of the optical antenna 1.

[0067] It should be noted that the optical power detector 51 mainly detects the average optical power of light and has a wide power monitoring range. For example, the optical power detector 51 is preferably a photodiode power probe, such as the S120CThorlabs photodiode power probe, which can detect light in the 400-1100nm wavelength band and has a detection range of 50nW to 50mW.

[0068] The power controller 52 is used to receive the optical power value and the energy calibration result output by the signal processing module 4 in real time, and adjust the adjustable optical attenuator according to the optical power value and the energy calibration result.

[0069] More specifically, the beam splitter 3 splits the regulated optical signal into two paths, one of which is transmitted to the optical power detector 51, and the other to the photodetector 41. The photodetector 41 and the optical power detector 51 are placed at the focal point of the optical antenna 1.

[0070] To simplify the design and improve system integration, as an example, the power controller 52 and the main control unit 43 can be integrated on a single board. That is, the power controller 52 is integrated into the main control unit 43, and the main control chip FPGA of the main control unit 43 implements the power control function.

[0071] In addition, the device may also include a calibration light source module 6 for calibrating the initial energy.

[0072] As one embodiment, the calibration light source module 6 includes a laser driving circuit 61 and a laser 62 connected in sequence.

[0073] The laser driving circuit 61 is used to drive the laser 62 to emit calibration light sources of different powers according to the energy calibration command generated by the main control unit 43. Specifically, the optical power of the laser 62 is adjustable by controlling the magnitude of the driving current of the laser driving circuit 61.

[0074] Laser 62, whose optical axis forms a 45-degree angle with the reflecting surface of beam splitter 3, is used to emit a calibration light source. Preferably, laser 62 can achieve power adjustment from 0.01mw to 10mw.

[0075] It should be noted that during the energy calibration phase, the main control unit 43 controls the calibration light source module 6 to emit light signals and feeds back the calibration results to the power controller 52.

[0076] Secondly, the present invention also provides an energy adaptive adjustment method for underwater wireless optical communication, which utilizes the energy adaptive adjustment device described above to achieve energy adaptive adjustment.

[0077] Specifically, the method includes an energy calibration phase and an energy adaptive adjustment communication phase:

[0078] Energy calibration stage S1: Receive energy calibration command, turn on calibration light source, change incident light power to obtain energy calibration range, turn off calibration light source to complete calibration;

[0079] Energy adaptive adjustment communication phase S2: Obtain a safe operating range within the energy calibration range; during communication, monitor the optical power value output by the optical power detector 51 in real time, and ensure that the optical power value is within the safe operating range by adjusting the voltage value output by the power controller 52.

[0080] It should be noted that obtaining the safe working range within the energy calibration range includes the following: if the energy calibration range is [P1, P2] and the safe working range is [P3, P4], then the first endpoint P1, the second endpoint P2, the third endpoint P3, and the fourth endpoint P4 must satisfy: P1 + P2 = P3 + P4, and P1 < P3 < P4 < P2.

[0081] As an example, the energy calibration interval [P1, P2] is obtained by:

[0082] By changing the incident light power of the calibration light source, the signal processing module 4 obtains a first voltage value V corresponding to the incident light power. 10 Simultaneously, the adaptive adjustment module 5 obtains the optical power value P0 corresponding to the incident light power.

[0083] Obtain the preset minimum voltage value V during communication. 11 and maximum voltage value V 12 ;

[0084] Let the first voltage value V 10 =V 11 The corresponding optical power value P1 is obtained;

[0085] Let the first voltage value V 10 =V 12 The corresponding optical power value P2 is obtained.

[0086] As a specific embodiment, the energy calibration stage can be specifically as follows:

[0087] S101: When the device does not have a calibration light source module 6, the energy calibration stage can be calibrated using an external laser light source; when the device includes a calibration light source module 6, the energy calibration stage can be calibrated directly using the calibration light source module 6.

[0088] Specifically, when the device does not calibrate the light source module 6, the external laser 62 is turned on and incident from the main optical axis of the optical antenna 1. By adjusting the intensity of the laser 62 or by adjusting the adjustable light attenuator 2, the light power incident on the beam splitter 3 is scanned from small to large. The incident light signal of the external laser 62 is split into two paths by the beam splitter 3. One path is received by the optical power detector 51 and the other path is received by the photodetector 41.

[0089] When the device includes the calibration light source module 6, the main control unit 43 turns on the laser driving circuit 61 in the calibration light source module 6 and uses the laser driving circuit 61 to drive the emitted light power of the laser 62 to scan from small to large. The laser emitted by the laser 62 is split into two paths by the beam splitter 3. One path is received by the optical power detector 51 and the other path is received by the photodetector 41.

[0090] S102: The main control unit 43 performs digital quantization on the acquired electrical signal, takes the average value, and obtains the first voltage value V corresponding to the calibration light source under different emitted light powers. 10 Meanwhile, the power controller 52 digitally quantizes the optical power signal detected by the optical power detector 51, takes the average value, and obtains the corresponding optical power value P0.

[0091] S103: Obtain the preset minimum voltage value V during communication. 11 and maximum voltage value V 12 When V 11 ≤V 10 ≤V 12 Only then can signal processing module 4 correctly demodulate and recover the original signal.

[0092] When V 10 =(V 11 +V 12 When the value is 40 / 2, record the corresponding optical power value P0'. This is the optimal energy point of the optical signal, which is also the optimal operating point of the photodetector 41.

[0093] Let V 10 =V 11 This yields the corresponding optical power value P1, which is the first end value (minimum value) of the energy calibration interval.

[0094] Let V 10 =V 12 This yields the corresponding optical power value P2, which is the second end value (maximum value) of the energy calibration interval.

[0095] S104: Turn off laser 62, complete energy calibration, and feed back the energy calibration result to power controller 52.

[0096] It should be noted that the power controller 52 outputs a second voltage value V. 20 To control the attenuation of the tunable attenuator 2, when V 20 =V 21 When V, the attenuation is minimal. 20 =V 22 At that time, the attenuation is the greatest, and it is within [V]. 21 V 22 Within the range, the higher the voltage, the greater the attenuation of the adjustable attenuator 2.

[0097] As a specific embodiment, the energy adaptive regulation communication phase can be specifically as follows:

[0098] S201: Turn on the device and output the second voltage value V from the power controller 52. 20 Adjust to the maximum attenuation value V 22 .

[0099] S202: Obtain a safe operating range [P3, P4] within the energy calibration range [P1, P2];

[0100] S203: During communication, the power controller 52 monitors the optical power value P0 output by the optical power detector 51 in real time and ensures that the optical power value is within the safe operating range.

[0101] As one example, ensuring the optical power value remains within the safe operating range by adjusting the voltage output of the power controller 52 includes:

[0102] When the optical power value P0 satisfies P0 < P1 or P2 < P0, that is, when the optical power value P0 is outside the energy calibration interval [P1, P2], the adjustment step is increased until the optical power value P0 satisfies P1 ≤ P0 ≤ P2, that is, until the optical power value P0 is within the energy calibration interval [P1, P2], the adjustment step is decreased.

[0103] When P1≤P0≤P3, adjust the power controller 52 to increase the optical power value;

[0104] When P3 < P0 < P4, the optical power value remains unchanged;

[0105] When P4≤P0≤P2, adjust the power controller 52 to reduce the optical power value.

[0106] As a specific embodiment, taking underwater wireless optical communication in a certain situation as an example, the device adopts DCO-OFDM-QAM modulation mode with a modulation rate of 40Mbps. The laser 62 at the transmitting end has an average optical power of 500mw blue light. Under water quality conditions of 0.2dB / m, it can achieve effective communication distance from 2 meters to 200 meters.

[0107] The specific steps of communication include:

[0108] ① Power on the device;

[0109] ② The main control unit 43 is reset, and the second voltage value V output by the power controller 52 is set. 20 Adjust to the maximum attenuation value, which is V. 20 =V 22 =5V;

[0110] ③ Turn on the calibration light source and start the energy calibration stage. Change the light power emitted by laser 62. The main control unit 43 uses low-speed AD to acquire the signal and calculate the average value of the acquired voltage to obtain the average voltage value V under different incident powers. 10 Meanwhile, the average optical power value P0 of the output of the optical power detector 51 is recorded;

[0111] ④ The main control unit 43 acquires the preset minimum voltage value V during the communication process. 11 and maximum voltage value V 12 The energy calibration interval [P1, P2] is obtained;

[0112] ⑤ Enter the adaptive communication phase and acquire a safe working range [P3, P4] within the energy calibration range [P1, P2];

[0113] ⑥ During communication, the power controller 52 monitors the optical power value P0 output by the optical power detector 51 in real time and ensures that the optical power value is within the safe operating range;

[0114] ⑦ Power off the device to end communication.

[0115] In summary, although using a high-sensitivity photodetector can increase the communication distance, it is prone to saturation and damage from strong light. To improve the dynamic range and robustness of the device, this invention performs real-time adaptive adjustment of the incident light power, so that during communication, the light intensity energy of the signal light can be adaptively adjusted and kept within a safe operating range. This solves the problems of high-sensitivity photodetectors being prone to saturation and susceptible to strong light, greatly improving the working dynamic range of the underwater wireless optical communication system. It enables communication at both short and long distances and protects the photodetector from damage by strong light, increasing the practicality of underwater optical technology.

[0116] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0117] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0118] In the several embodiments provided in this application, it should be understood that the disclosed methods or systems can be implemented in other ways. For example, the embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0119] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0120] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0121] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage device. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0122] Those skilled in the art will understand that all or part of the circuits in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0123] The foregoing description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

[0124] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An underwater wireless optical communication energy adaptive adjustment device, characterized in that, The device includes: an adaptive adjustment module, a signal processing module, and an optical antenna, an adjustable optical attenuator, and a beam splitter arranged sequentially along the optical path. The adjustable optical attenuator is used to adjust the light intensity energy of the optical signal according to the feedback signal of the adaptive adjustment module; The beam splitter is used to split the optical signal output by the adjustable optical attenuator into two paths, one of which is transmitted to the adaptive adjustment module and the other of which is transmitted to the signal processing module. The signal processing module is used to generate energy calibration results and send them to the adaptive adjustment module, as well as to receive the optical signal from the beam splitter, process it, and output it. The adaptive adjustment module includes an optical power detector and a power controller connected in sequence; it is used to receive signals from the beam splitter and the signal processing module, process them, and then feed them back to the adjustable optical attenuator. Within the energy calibration range [P1, P2], a safe operating range [P3, P4] is obtained, where P1 + P2 = P3 + P4, and P1 < P3 < P4 < P2. During communication, the optical power value P0 output by the optical power detector is monitored in real time, and the voltage value output by the power controller is adjusted to ensure that the optical power value P0 is within the safe operating range.

2. The underwater wireless optical communication energy adaptive adjustment device according to claim 1, characterized in that, The adaptive adjustment module comprises the following components connected in sequence: An optical power detector is used to measure the optical power value of the optical signal received from the beam splitter and transmit the optical power value to the power controller; A power controller is used to receive the optical power value and the energy calibration result in real time, and adjust the adjustable optical attenuator according to the optical power value and the energy calibration result.

3. The underwater wireless optical communication energy adaptive adjustment device according to claim 1, characterized in that, The signal processing module includes a photodetector, a matched filter circuit, and a main control unit connected in sequence.

4. The energy adaptive adjustment device for underwater wireless optical communication according to claim 1, characterized in that, The reflective surface of the beam splitter forms a 45-degree angle with the incident optical axis of the optical signal.

5. The underwater wireless optical communication energy adaptive adjustment device according to claim 3, characterized in that, The photodetector and the optical power detector are positioned at the focal point of the optical antenna.

6. The energy adaptive adjustment device for underwater wireless optical communication according to claim 3, characterized in that, The device also includes the following connected in sequence: A laser, wherein the optical axis of the laser forms a 45-degree angle with the reflecting surface of the beam splitter prism, and is used to emit a calibration light source; The laser driving circuit is used to drive the laser to emit calibration light sources of different powers according to the energy calibration instructions generated by the main control unit.

7. A method for adaptive energy adjustment in underwater wireless optical communication, characterized in that, Energy adaptive regulation is achieved using an underwater wireless optical communication energy adaptive regulation device as described in any one of claims 1 to 6, the method comprising: Upon receiving the energy calibration command, the calibration light source is turned on, the incident light power is changed to obtain the energy calibration range, and the calibration light source is turned off to complete the calibration. Obtain a safe operating range within the energy calibration range; During communication, the optical power value output by the optical power detector is monitored in real time, and the voltage value output by the power controller is adjusted to ensure that the optical power value is within the safe operating range.

8. The energy adaptive adjustment method for underwater wireless optical communication according to claim 7, characterized in that, By adjusting the voltage value output by the power controller, the optical power value is ensured to be within the safe operating range, including: When the optical power value P0 satisfies P0 < P1 or P2 < P0, the adjustment step is increased until the optical power value P0 satisfies P1 ≤ P0 ≤ P2, and then the adjustment step is decreased. When P1≤P0≤P3, adjust the power controller to increase the optical power value; When P3 < P0 < P4, the optical power value remains unchanged; When P4≤P0≤P2, the power controller is adjusted to reduce the optical power value.

9. The energy adaptive adjustment method for underwater wireless optical communication according to claim 7, characterized in that, The energy calibration interval [P1, P2] is obtained by: By changing the incident light power of the calibration light source, the signal processing module obtains a first voltage value V corresponding to the incident light power 10 ; at the same time, the adaptive adjustment module obtains a light power value P0 corresponding to the incident light power; Obtain the preset minimum voltage value V during communication. 11 and maximum voltage value V 12 ; Let the first voltage value V 10 =V 11 The corresponding optical power value P1 is obtained; Let the first voltage value V 10 =V 12 The corresponding optical power value P2 is obtained.

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