CN116722921A - Underwater wireless optical system for inhibiting turbulence effect - Google Patents
Underwater wireless optical system for inhibiting turbulence effect Download PDFInfo
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- CN116722921A CN116722921A CN202310795947.5A CN202310795947A CN116722921A CN 116722921 A CN116722921 A CN 116722921A CN 202310795947 A CN202310795947 A CN 202310795947A CN 116722921 A CN116722921 A CN 116722921A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 91
- 230000000694 effects Effects 0.000 title claims abstract description 24
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 13
- 230000003044 adaptive effect Effects 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 30
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an underwater wireless optical system for inhibiting turbulence effect, which relates to the technical field of wireless optical communication and comprises an optical transmitting end, an underwater channel, a self-adaptive optical system and an optical receiving end, wherein the optical transmitting end comprises a channel coding unit, a DPSK modulator, a transmitting light source and a light source driver, the transmitting light source is driven by the light source driver and can transmit light beams which do not carry any information, the self-adaptive optical system comprises a wavefront controller, a wavefront corrector and a wavefront sensor, and one end of the self-adaptive optical system is connected with the optical transmitting end through a channel; the wave front sensor is used for measuring the phase condition of the incident light beam emitted by the light emitting end in real time. The invention can overcome the influence of underwater turbulence on the performance of the underwater wireless optical communication system and realize the long-distance communication of the underwater wireless light.
Description
Technical Field
The invention relates to the technical field of wireless optical communication, in particular to an underwater wireless optical system for inhibiting turbulence effect.
Background
In the environment of world resource shortage, the utilization of ocean resources becomes particularly important, and an underwater communication system with excellent performance has very important significance for ocean research. The underwater wireless optical communication receives a great deal of attention because of the advantages of high communication speed, good confidentiality, strong real-time performance and the like.
The main factors affecting wireless optical communication are medium turbulence and optical power attenuation. Because of the underwater turbulence existing in the special environment in the water, the water body has serious absorption and scattering effects on visible light, which limits the communication distance and communication quality of the underwater wireless optical communication and increases the error rate of the communication system. In order to reduce the influence of underwater turbulence on underwater wireless optical communication, researchers propose to use a space diversity technology of MIMO to resist channel weakening caused by turbulence, and a multi-input multi-output structure can reduce the weakening influence and has higher energy efficiency, channel capacity and stability. However, since the signal detection capability of the underwater wireless optical communication is seriously affected by the multi-channel signal combining method, the MIMO technology is only in the theoretical exploration stage at present, so that an underwater wireless optical system for suppressing the turbulence effect is needed to change the current situation.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an underwater wireless light system for inhibiting turbulence effect. The underwater wireless optical communication system has the advantages of overcoming the influence of underwater turbulence on the performance of the underwater wireless optical communication system and realizing the long-distance communication of the underwater wireless light.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an underwater wireless optical system for inhibiting turbulence effect comprises an optical transmitting end, an underwater channel, a self-adaptive optical system and an optical receiving end;
the light emitting end comprises a channel coding unit, a DPSK modulator, an emitting light source and a light source driver, wherein the emitting light source is driven by the light source driver and can emit light beams which do not carry any information;
the self-adaptive optical system comprises a wavefront controller, a wavefront corrector and a wavefront sensor, and one end of the self-adaptive optical system is connected with the light emitting end through a channel; the wave front sensor is used for measuring the phase condition of an incident light beam emitted by the light emitting end in real time; the wave front controller processes the measurement result and generates a control signal acting on the wave front corrector; the wavefront corrector corrects the light beam to obtain an approximate plane wave light beam;
the optical receiving end comprises a photoelectric detector, a filter, an amplifier and a modulation module, and one end of the optical receiving end is connected with the adaptive optical system through a channel; the photoelectric detector converts the received optical signal emitted by the adaptive optical system into an electric signal; the filter filters out signal noise; the amplifier amplifies the optical signal; the modulation module demodulates the electrical signal into raw data.
The invention is further arranged that the emission light source is at least one of an LED light source or an LD light source with the wavelength of 450-480nm and 500-560 nm.
The invention is further configured that the channel coding unit is used for transmitting data, adding redundancy check bits, suppressing underwater turbulence, selecting Turbo codes, and selecting coding types according to channel environment, including but not limited to RS codes, LDPC codes and convolution codes.
The invention further provides that the modulation module is used for converting the electric signal into the optical signal, and the modulation module is a DPSK modulator.
The invention is further arranged such that the photodetector may select at least one of a photodiode, an avalanche photodiode and a photomultiplier tube depending on the requirements of use.
The invention is further arranged that the amplifier is at least one of a fiber amplifier or a semiconductor laser amplifier.
The invention is further arranged that the filter can select at least one of a high-pass filter, a low-pass filter, a band-stop filter and a band-pass filter according to requirements.
The beneficial effects of the invention are as follows:
1. the underwater wireless optical system for inhibiting the turbulence effect adopts the multi-beacon adaptive optical system to automatically adjust according to the change of the underwater channel, so that the system can be more suitable for the random underwater channel environment, the influence of the underwater turbulence on optical signals is reduced, and the communication distance and the communication quality of the underwater wireless optical communication system are improved.
2. The underwater wireless optical system for inhibiting the turbulence effect adopts the Turbo code, and the optical amplifier and the filter are added into the optical receiving end of the system, so that the utilization rate of optical power is improved, the transmitting power is saved, and the underwater turbulence effect can be effectively inhibited.
3. The underwater wireless optical system for inhibiting the turbulence effect adopts DPSK modulation, so that the background noise of the underwater environment is eliminated to a certain extent, and the influence of the underwater turbulence on the performance of the underwater wireless optical communication system is overcome.
Drawings
Fig. 1 is a schematic diagram of the overall structure of an underwater wireless optical system for suppressing turbulence effect according to the present invention.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the patent and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and are therefore not to be construed as limiting the patent.
In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.
Referring to fig. 1, an underwater wireless light system for suppressing turbulence effect includes a light emitting end portion, an underwater channel portion, an adaptive optics system portion, and a light receiving end portion.
The light emitting end comprises a channel coding unit, a DPSK modulator, an emitting light source and a light source driver; the transmitting light source is driven by the light source driver, can transmit light beams without carrying any information, the original data to be transmitted is input to the light transmitting end, is coded by the coder, and is loaded on the DPSK modulator to be converted into current which changes along with the signal to drive the light source, and the electric signal is converted into an optical signal.
The self-adaptive optical system comprises a wavefront controller, a wavefront corrector and a wavefront sensor, and one end of the self-adaptive optical system is connected with the light emitting end through a channel; the wave front sensor is used for measuring the phase condition of an incident light beam emitted by the light emitting end in real time; the wave front controller processes the measurement result and generates a control signal acting on the wave front corrector; the wavefront corrector corrects the light beam to obtain an approximate plane wave light beam, and the light emitted by the light emitting end of the system is influenced by underwater turbulence to generate wavefront distortion. The distorted light beam is divided into two parts after passing through a beam splitter, one part of the light beam enters an imaging system, and the other part of the light beam enters a wavefront sensor. The wave front sensor measures the phase condition of the incident light beam in real time, the measuring result is processed by the wave front controller, a control signal acting on the wave front corrector is generated, the wave front corrector generates a phase correction amount with the same size and opposite phase to the wave front phase measuring result, wave front phase distortion of the light beam caused by underwater turbulence is compensated, and accordingly the corrected light beam becomes approximate plane wave.
The light receiving end comprises a photoelectric detector, a filter, an amplifier and a DPSK modulator. The receiving end converges the parallel light beams sent by the self-adaptive optical system onto the photoelectric detector in the form of a point light source, converts optical signals into electric signals, reduces system noise through a filter, amplifies the signals by an amplifier, carries out digital signal processing on the signals, and finally demodulates the electric signals into original data by a DPSK modulator.
Preferably, the light emitting source is an LED light source or an LD light source with wavelengths of 450-480nm and 500-560 nm.
Accordingly, the light source driver selects the LED light source driving or the LD light source driving according to the reflection light source.
Further, the channel coding unit adds redundancy check bits to the transmission data so as to correct errors in time, the Turbo code is selected for suppressing underwater turbulence, and the coding type can be selected according to the channel environment, including but not limited to RS codes, LDPC codes, convolution codes and the like.
Further, the photodetector may be selected from photodiodes, avalanche photodiodes, photomultiplier tubes, etc., depending on the needs of the application. Long-range communication may select avalanche photodiodes; a selectable photomultiplier requiring low noise, high sensitivity and optical gain; the performance requirement is not high, and the photodiode can be selected with the cost to be controlled.
Further, the amplifier selectable fiber amplifiers include rare earth element doped fiber amplifiers and nonlinear fiber amplifiers; the semiconductor optical amplifier includes a resonant optical amplifier, a traveling wave semiconductor optical amplifier, a semiconductor laser amplifier, and the like.
Further, the filter may select a high pass filter, a low pass filter, a band stop filter, a band pass filter, and the like as desired.
Dynamic improvement of signal quality is achieved by measuring optical signal wavefront distortion in real time and immediately compensating for it using a multi-beacon adaptive optics system (MCAO). The common self-adaptive optical system cannot work on a dark and weak target due to the small wave front detection sub-aperture and high sampling frequency. The multi-beacon adaptive optical system is an important method for expanding the effective correction view field, synchronous detection is carried out by using a plurality of beacons, the three-dimensional distribution of underwater turbulence is calculated through a chromatography algorithm, and the three-dimensional distribution is corrected by using a plurality of wavefront correctors conjugated to different heights.
An optical amplifier and a filter are added at a receiving end of the underwater wireless optical communication system to amplify received optical signals and filter noise, so that the purpose of improving optical power is achieved, and the underwater turbulence effect can be effectively restrained.
The adoption of the coding scheme in the underwater wireless optical communication system is a means for effectively inhibiting the underwater turbulence effect. The channel coding in the system adopts Turbo codes, simple component codes are cascaded in parallel through pseudo-random interleavers to construct long codes with pseudo-random characteristics, and the pseudo-random decoding is realized by carrying out multiple iterations between two soft-in/soft-out (SISO) decoders. The Turbo code can effectively reduce the required receiving power so as to save the transmitting power and obtain better communication performance.
Differential Phase Shift Keying (DPSK) modulation is used, which can be demodulated without knowledge of absolute phase compared to conventional PSK modulation. The DPSK modulation can eliminate background noise, and the error rate of the underwater wireless optical communication system is superior to that of the system in the traditional modulation mode such as OOK modulation, and plays a certain role in inhibiting the underwater turbulence effect.
In summary, the underwater wireless optical communication system for inhibiting the turbulence effect disclosed by the invention uses the multi-beacon self-adaptive optical system connected with the optical receiving end, and automatically adjusts according to the change of an underwater channel, so that the system can be more suitable for a random underwater channel environment, and the influence of the underwater turbulence on an optical signal is reduced; the optical amplifier and the filter are used for amplifying the received optical signals and filtering noise, so that the purpose of improving the optical power is achieved, and the underwater turbulence effect can be effectively restrained; the Turbo code is adopted in the channel coding, so that the required receiving power can be effectively reduced, the transmitting power is saved, and better communication performance is obtained; the modulation mode adopts Differential Phase Shift Keying (DPSK) modulation, so that background noise can be eliminated, and the error rate of the underwater wireless optical communication system is superior to that of the traditional modulation mode such as OOK modulation. The invention can effectively inhibit the underwater turbulence effect and realize long-distance underwater wireless optical communication.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. An underwater wireless optical system for inhibiting turbulence effect is characterized by comprising an optical transmitting end, an underwater channel, a self-adaptive optical system and an optical receiving end;
the light emitting end comprises a channel coding unit, a DPSK modulator, an emitting light source and a light source driver, wherein the emitting light source is driven by the light source driver and can emit light beams which do not carry any information;
the self-adaptive optical system comprises a wavefront controller, a wavefront corrector and a wavefront sensor, and one end of the self-adaptive optical system is connected with the light emitting end through a channel; the wave front sensor is used for measuring the phase condition of an incident light beam emitted by the light emitting end in real time; the wave front controller processes the measurement result and generates a control signal acting on the wave front corrector; the wavefront corrector corrects the light beam to obtain an approximate plane wave light beam;
the optical receiving end comprises a photoelectric detector, a filter, an amplifier and a modulation module, and one end of the optical receiving end is connected with the adaptive optical system through a channel; the photoelectric detector converts the received optical signal emitted by the adaptive optical system into an electric signal; the filter filters out signal noise; the amplifier amplifies the optical signal; the modulation module demodulates the electrical signal into raw data.
2. An underwater wireless light system suppressing turbulence effects as in claim 1, characterized in that the emission light source is at least one of an LED light source or an LD light source with a wavelength of 450-480nm and 500-560 nm.
3. An underwater wireless optical system for suppressing turbulence effect as claimed in claim 2, wherein the channel coding unit is used for transmitting data to increase redundancy check bits, suppressing underwater turbulence, selecting Turbo codes, and selecting coding types including but not limited to RS codes, LDPC codes, convolutional codes according to channel environment.
4. The submerged wireless optical system of claim 1, wherein the modulation module is configured to convert an electrical signal to an optical signal, and wherein the modulation module is a DPSK modulator.
5. The submerged wireless optical system of claim 4, wherein the photo detector is operable to select at least one of a photodiode, an avalanche photodiode, and a photomultiplier tube based on the application requirements.
6. The submerged wireless optical system of claim 1, wherein the amplifier is at least one of a fiber amplifier or a semiconductor laser amplifier.
7. An underwater wireless light system as in claim 6, wherein the filter is capable of selecting at least one of a high pass filter, a low pass filter, a band stop filter and a band pass filter as desired.
8. An underwater wireless light system suppressing turbulence effect as in claim 2, wherein the light source driver selects either LED light source driving or LD light source driving depending on the emission light source.
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| CN202310795947.5A CN116722921A (en) | 2023-07-01 | 2023-07-01 | Underwater wireless optical system for inhibiting turbulence effect |
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