CN114362836A - LED/LD array based transmitting-receiving integrated underwater wireless blue-green light communication system and method - Google Patents
LED/LD array based transmitting-receiving integrated underwater wireless blue-green light communication system and method Download PDFInfo
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Abstract
The invention provides an underwater wireless blue-green light communication system and method based on an LED/LD array transceiving integration, and solves the problems that an existing underwater mobile platform is low in alignment precision and easy to shake, and turbid seawater, dust and benthos cause loss or shielding of transmission signal light. The system comprises two pressure-resistant sealed cabins and two communication devices; each communication device comprises a transmitting unit, a signal processor and a receiving unit which are arranged in the pressure-resistant sealed cabin; the transmitting unit comprises a signal synchronization module, an adjustable voltage amplification module, a parallel driver, a parallel bias current driving module and M groups of LED/LD serial modules; the receiving unit comprises a signal sampling module, a signal filtering module, a signal amplifying module, a photoelectric detector and a receiving lens; the two communication devices are oppositely arranged, wherein M paths of LED/LD signals synchronously output by the M groups of LED/LD serial modules of one communication device are transmitted to a receiving lens of the other communication device through a channel.
Description
Technical Field
The invention belongs to the technical field of underwater wireless communication, and particularly relates to an underwater wireless blue-green light communication system and method based on an LED/LD array receiving and transmitting integration.
Background
In recent years, laser light has been widely used in space science research because of its advantages such as good directivity, good monochromaticity, good coherence, large information transmission amount, and low susceptibility to electromagnetic interference. With the development of underwater detection technology, the data volume is increasing day by day, and higher requirements are put forward for underwater high-speed communication. The underwater wireless optical communication has the characteristics of high bandwidth, low power consumption and low delay, and can meet the requirements of underwater high-speed communication.
The attenuation of the underwater transmission signal intensity is reduced in the 450nm-580nm blue-green light wave band in the visible light wave band range, so that the deep research on the underwater and atmospheric transmission characteristics of the blue-green light wave band is very necessary. However, the existing underwater mobile platform has low alignment precision and is easy to shake, and the transmission signal light can be greatly lost or completely shielded by turbid seawater, dust and other benthos caused in the submarine exploration or construction process, so that the further application and popularization of the wireless optical communication equipment under water are limited.
Disclosure of Invention
The invention provides an underwater wireless blue-green light communication system and method based on an LED/LD array transceiving integration, and aims to solve the technical problems that an existing underwater mobile platform is low in alignment precision and easy to shake, turbid seawater, dust and benthos cause loss or shielding on transmission signal light, and communication establishment and maintenance are affected.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an underwater wireless blue-green light communication system based on LED/LD array receiving and transmitting integration is characterized in that: the device comprises two pressure-resistant sealed cabins and two communication devices respectively arranged in the two pressure-resistant sealed cabins;
each communication device comprises a transmitting unit, a signal processor and a receiving unit which are arranged in the pressure-resistant sealed cabin;
the transmitting unit comprises M adjustable voltage amplifying modules, M parallel drivers, 1 signal synchronizing module, M parallel bias current driving modules and M groups of LED/LD serial modules, wherein M is an integer and is more than or equal to 3 and less than or equal to 9;
the output of the signal processor is respectively connected with the inputs of the M adjustable voltage amplification modules, the outputs of the M adjustable voltage amplification modules are respectively connected with the inputs of the M parallel drivers, the outputs of the M parallel drivers are respectively connected with the inputs of the M parallel bias current driving modules through the signal synchronization module, and the outputs of the M parallel bias current driving modules are respectively connected with the inputs of the M groups of LED/LD serial modules;
the receiving unit comprises a signal sampling module, a signal filtering module, a signal amplifying module, a photoelectric detector and a receiving lens; the photoelectric detector is positioned at the focus position of the light beam of the receiving lens, and a light filtering component is arranged on a light path between the photoelectric detector and the receiving lens; the output of the photoelectric detector is connected with the input of the signal processor through a signal amplification module, a signal filtering module and a signal sampling module which are arranged in sequence;
the pressure-resistant sealed cabin is provided with a glass window, the glass window is of an arc-shaped structure protruding outwards, light source plates and receiving lenses of the M groups of LED/LD serial modules are arranged opposite to the glass window, and the light source plates and the photoelectric detectors share an optical axis;
or the light source plate and the receiving lens of the M groups of LED/LD serial modules are both arranged on the pressure-resistant sealed cabin, the position of the light source plate or the receiving lens arranged on the pressure-resistant sealed cabin is of an arc structure protruding outwards, and the light source plate and the photoelectric detector share an optical axis;
the two communication devices are oppositely arranged in an outwards convex arc structure, and M paths of LED/LD signals synchronously output by the M groups of LED/LD serial modules of one communication device are transmitted to a receiving lens of the other communication device through a channel.
Furthermore, the filtering component comprises a dichroic filter and a color filter which are sequentially arranged along the light path, and the dichroic filter is arranged close to the photoelectric detector.
Further, the photoelectric detector adopts a large-area array photoelectric detector.
Further, the receiving lens is a lens which is convex in a direction away from the color filter.
Further, M is 6.
Further, the M groups of LED/LD series modules are arranged on the same plane circuit light source board.
Further, the glass window is a hemispherical transparent sealing window.
Meanwhile, based on the LED/LD array based integrated transceiving underwater wireless blue-green light communication system, the invention also provides an LED/LD array based integrated transceiving underwater wireless blue-green light communication method, which comprises the following steps:
1.1) a signal processor of one of the communication devices transmits M paths of digital synchronous signals;
1.2) M digital synchronous signals are amplified by M adjustable voltage amplification modules and then sent to M parallel drivers, and are sent to M parallel bias current driving modules after multi-path synchronization of the signal synchronization modules, the M parallel bias current driving modules drive M groups of LED/LD serial modules, so that the working voltage of each LED/LD is in a linear range, and the digital signals are modulated onto optical signals, so that the M groups of LED/LD serial modules synchronously output M paths of LED/LD signals;
1.3) transmitting the M paths of LED/LD signals to a receiving lens of another communication device through an underwater channel, filtering background light and stray light by a filter assembly of a second communication device, and receiving the background light and the stray light by a photoelectric detector of the second communication device;
and 1.4) the photoelectric detector converts the received LED/LD signals into electric signals, and the electric signals enter a signal processor for signal demodulation processing after being sequentially amplified by a signal amplification module, filtered by noise of a signal filtering module and sampled by a high-speed signal sampling module, so that communication is realized.
Compared with the prior art, the invention has the advantages that:
1. the invention realizes high-power large-angle emission and wide-view-field reception based on the application of synchronous emission and large-area array detection of the LED/LD array, and can greatly provide environmental adaptability and compatibility of the underwater optical communication system under complex marine environment and complex working condition compared with single-point high-power LED/LD and LD emission.
2. The invention greatly improves the application range of the underwater wireless optical communication system, and always ensures the rapid establishment and stable maintenance of the optical communication link under different environments such as shaking of a platform, turbid water quality, dust raising, local shielding and the like.
3. Compared with a 360-degree 4 pi space sealing technology applied to the existing underwater optical sensing system, the LED/LD array and the wide-field receiving technology can be combined with the existing underwater optical sensing system, the transmitting angle and the receiving field of underwater optical communication are further effectively improved, the omnibearing optical link coverage is realized, the technical development of a little more underwater optical communication is further promoted, and the underwater optical sensing system has a wide application prospect and a wide popularization value.
4. The transmitting unit is based on the LED/LD array, can realize high-power transmission, and can simultaneously realize underwater lighting, guiding and communication functions.
5. The system is suitable for fast chain establishment and stable communication in an underwater complex environment, and the establishment time and stability of underwater wireless optical communication are improved.
Drawings
FIG. 1 is a block diagram of the principle structure of an underwater wireless blue-green light communication system based on an LED/LD array transceiving integration;
fig. 2 is a block diagram of a first communication apparatus in the embodiment of the present invention;
fig. 3 is a block diagram showing the structure of a second communication apparatus according to the embodiment of the present invention;
wherein the reference numbers are as follows:
1-a first communication device, 101-a first dry cabin high-voltage withstand voltage sealed cabin, 110-a first signal processor, 111-a first adjustable voltage amplification module, 112-a first parallel driver, 113-a second adjustable voltage amplification module, 114-a second parallel driver, 115-a third adjustable voltage amplification module, 116-a third parallel driver, 117-a fourth adjustable voltage amplification module, 118-a fourth parallel driver, 119-a fifth adjustable voltage amplification module, 120-a fifth parallel driver, 121-a sixth adjustable voltage amplification module, 122-a sixth parallel driver, 123-a first signal synchronization module, 124-a first parallel bias current driving module, 125-a first group of LED/LD series modules, 126-a second parallel bias current driving module, 127-a second group of LED/LD series modules, 128-a third parallel bias current driving module, 129-a third group of LED/LD series modules, 130-a fourth parallel bias current driving module, 131-a fourth group of LED/LD series modules, 132-a fifth parallel bias current driving module, 133-a fifth group of LED/LD series modules, 134-a sixth parallel bias current driving module, 135-a sixth group of LED/LD series modules, 136-a first signal sampling module, 137-a first signal filtering module, 138-a first signal amplifying module, 139-a first photodetector, 140-a first dichroic filter, 141-a first color filter, 142-a first receiving lens;
2-a second communication device, 201-a second dry cabin high-voltage withstand voltage sealed cabin, 210-a second signal processor, 211-a seventh adjustable voltage amplification module, 212-a seventh parallel driver, 213-an eighth adjustable voltage amplification module, 214-an eighth parallel driver, 215-a ninth adjustable voltage amplification module, 216-a ninth parallel driver, 217-a tenth adjustable voltage amplification module, 218-a tenth parallel driver, 219-an eleventh adjustable voltage amplification module, 220-an eleventh parallel driver, 221-a twelfth adjustable voltage amplification module, 222-a twelfth parallel driver, 223-a second signal synchronization module, 224-a seventh parallel bias current driving module, 225-a seventh group of LED/LD series modules, 226-an eighth parallel bias current driving module, 227-eighth group LED/LD series module, 228-ninth parallel bias current driving module, 229-ninth group LED/LD series module, 230-tenth parallel bias current driving module, 231-tenth group LED/LD series module, 232-eleventh parallel bias current driving module, 233-eleventh group LED/LD series module, 234-twelfth parallel bias current driving module, 235-twelfth group LED/LD series module, 236-second signal sampling module, 237-second signal filtering module, 238-second signal amplifying module, 239-second photodetector, 240-second dichroic filter, 241-second color filter, 242-second receiving lens.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
First, it should be noted that each electronic component (part) used in the first communication device 1 and the second communication device 2 of the present invention is a mature technology, and there are corresponding commercially available products. The present invention can be fully reproduced by those skilled in the art based on their knowledge of radio and various digital signal processing skills, upon reading and understanding the present specification.
As shown in fig. 1, the underwater wireless blue-green light communication system based on the LED/LD array transceiver of the present invention includes two pressure-tight compartments and two communication devices respectively disposed in the two pressure-tight compartments, and the communication devices can be fixed to the fixing members inside the pressure-tight compartments or disposed at the opposite positions of the glass windows on the pressure-tight compartments.
The two sealed cabins are respectively a first dry cabin high-pressure-resistant sealed cabin 101 and a second dry cabin high-pressure-resistant sealed cabin 201, the two communication devices are respectively a first communication device 1 arranged in the first dry cabin high-pressure-resistant sealed cabin 101 and a second communication device 2 arranged in the second dry cabin high-pressure-resistant sealed cabin 201, the first communication device 1 and the second communication device 2 are consistent in structural composition and respectively comprise a transmitting unit and a receiving unit, so that the two-way wireless communication function of the first communication device 1 and the second communication device 2 is realized, and an underwater wireless optical communication system is formed under a complex seawater channel and a working condition.
The first communication device 1 is shown in fig. 2 and comprises a first transmitting unit, a first signal processor 110 and a first receiving unit which are arranged in the first dry chamber high-pressure-resistant sealed chamber 101; the first signal processor 110 has at least six output ports for synchronously outputting baseband signals and at least one electrical signal input interface for inputting the same signal, and the first signal processor 110 of this embodiment has six output interfaces and one input interface.
The first transmitting unit comprises a first adjustable voltage amplifying module 111, a first parallel driver 112, a second adjustable voltage amplifying module 113, a second parallel driver 114, a third adjustable voltage amplifying module 115, a third parallel driver 116, a fourth adjustable voltage amplifying module 117, a fourth parallel driver 118, a fifth adjustable voltage amplifying module 119, a fifth parallel driver 120, a sixth adjustable voltage amplifying module 121, a sixth parallel driver 122, a first signal synchronizing module 123, a first parallel bias current driving module 124, a first group of LED/LD series modules 125, a second parallel bias current driving module 126, a second group of LED/LD series modules 127, a third parallel bias current driving module 128, a third group of LED/LD series modules 129, a fourth parallel bias current driving module 130, a fourth parallel bias current driving module 117, a fourth adjustable voltage amplifying module 117, a fifth adjustable voltage amplifying module 119, a fifth parallel driver 120, a sixth adjustable voltage amplifying module 121, a sixth parallel driver 122, a first signal synchronizing module 123, a first parallel bias current driving module 124, a second group of LED/LD series modules 125, a second parallel bias current driving module 126, a second group of LED/LD series modules 127, a third parallel bias current driving module 128, a third group of LED/LD series modules 129, a fourth parallel bias current driving module 130, a third parallel bias current driving module of a third parallel bias current driving module, A fourth group of LED/LD series modules 131, a fifth parallel bias current drive module 132, a fifth group of LED/LD series modules 133, a sixth parallel bias current drive module 134, and a sixth group of LED/LD series modules 135.
A first output interface of the first signal processor 110 is sequentially connected to the first adjustable voltage amplification module 111, the first parallel driver 112, the first signal synchronization module 123, the first parallel bias current driving module 124, and the first LED/LD series module 125; a second output interface of the first signal processor 110 is sequentially connected with the second adjustable voltage amplification module 113, the second parallel driver 114, the first signal synchronization module 123, the second parallel bias current driving module 126, and the second group LED/LD series module 127; a third output interface of the first signal processor 110 is sequentially connected with a third adjustable voltage amplification module 115, a third parallel driver 116, a first signal synchronization module 123, a third parallel bias current driving module 128 and a third group LED/LD series module 129; a fourth output interface of the first signal processor 110 is sequentially connected with a fourth adjustable voltage amplification module 117, a fourth parallel driver 118, a first signal synchronization module 123, a fourth parallel bias current driving module 130, and a fourth group LED/LD series module 131; a fifth output interface of the first signal processor 110 is sequentially connected to the fifth adjustable voltage amplification module 119, the fifth parallel driver 120, the first signal synchronization module 123, the fifth parallel bias current driving module 132, and the fifth group LED/LD series module 133; a sixth output interface of the first signal processor 110 is connected to the sixth adjustable voltage amplifying module 121, the sixth parallel driver 122, the first signal synchronizing module 123, the sixth parallel bias current driving module 134, and the sixth LED/LD series module 135 in sequence.
The first group of LED/LD series modules 125, the second group of LED/LD series modules 127, the third group of LED/LD series modules 129, the fourth group of LED/LD series modules 131, the fifth group of LED/LD series modules 133, and the sixth group of LED/LD series modules 135 may be reasonably arranged on the same planar circuit light source board i, a glass window capable of transmitting laser is arranged on the wall of the first trunk high-pressure-resistant sealed cabin 101 in this embodiment, and preferably, the glass window is a hemispherical transparent sealed window; the light source plate I is arranged opposite to a glass window of the first dry cabin high-pressure-resistant sealed cabin 101. In other embodiments, the light source board i can be directly embedded in the wall of the first dry chamber capsule 101.
The first signal processor 110 is configured to modulate and transmit a digital signal, receive a digital signal, and demodulate the digital signal, the first adjustable voltage amplification module 111, the second adjustable voltage amplification module 113, the third adjustable voltage amplification module 115, the fourth adjustable voltage amplification module 117, the fifth adjustable voltage amplification module 119, and the sixth adjustable voltage amplification module 121 are configured to amplify a data signal transmitted by the first signal processor 110, respectively, the first parallel driver 112, the second parallel driver 114, the third parallel driver 116, the fourth parallel driver 118, the fifth parallel driver 120, and the sixth parallel driver 122 are configured to perform parallel multi-level current driving on the serial LED/LD modules, the first signal synchronization module 123 is configured to perform parallel multi-level current driving on the first path of driving signal output by the first parallel driver 112, the second path of driving signal output by the second parallel driver 114, the third path of driving signal output by the third parallel driver 116, and the third path of driving signal output by the third parallel driver 116, The fourth driving signal output by the fourth parallel driver 118, the fifth driving signal output by the fifth parallel driver 120, and the sixth driving signal output by the sixth parallel driver 122 are synchronized, so that the output light signals of the first group of LED/LD series modules, the second group of LED/LD series modules, the third group of LED/LD series modules, the fourth group of LED/LD series modules, the fifth group of LED/LD series modules, and the sixth group of LED/LD series modules are synchronized.
The first receiving unit comprises a first signal sampling module 136, a first signal filtering module 137, a first signal amplifying module 138, a first photoelectric detector 139, a first dichroic filter 140, a first color filter 141 and a first receiving lens 142 which are installed in the first dry cabin high pressure resistant sealed cabin 101.
The first photodetector 139, the first signal amplifying module 138, the first signal filtering module 137 and the first signal sampling module 136 are sequentially connected, and an output of the first signal sampling module 136 is connected with an input of the first signal processor 110; the first photodetector 139 is arranged opposite to the first receiving lens 142, the first receiving lens 142 is a convex lens, the first photodetector 139 is located at the focal position of the light beam of the first receiving lens 142, and a first dichroic filter 140 and a first color filter 141 are sequentially placed on the light path between the first photodetector 139 and the first receiving lens 142; the first receiving lens 142 is disposed in the cavity of the first dry chamber capsule 101, the first receiving lens 142 is disposed opposite to the glass window of the first dry chamber capsule 101, and the light source plate i and the first photodetector 139 share a common optical axis.
The transmitting unit and the receiving unit of the first communication apparatus 1 share the first signal processor 110; the emitting unit and the receiving unit share a hemispherical transparent sealing window, the LED/LD array light source plate is positioned on the central section of a hemisphere, and the light sensing surface of the first photoelectric detector 139 is positioned at the center of the hemisphere receiving lens; the LED/LD array light source (light source board i) and the first photodetector 139 are coaxial.
The second communication device 2, as shown in fig. 3, includes a second transmitting unit, a second signal processor and a second receiving unit which are arranged in the second dry chamber hyperbaric pressure-proof sealed chamber 201; the second signal processor 210 has at least six output ports for synchronously outputting baseband signals and at least one electrical signal input interface for inputting the same signal, and the output ports of the second signal processor 210 are equal to the output ports of the first signal processor 110. The second signal processor 210 of this embodiment has six output interfaces and one input interface.
The second transmitting unit comprises a seventh adjustable voltage amplifying module 211, a seventh parallel driver 212, an eighth adjustable voltage amplifying module 213, an eighth parallel driver 214, a ninth adjustable voltage amplifying module 215, a ninth parallel driver 216, a tenth adjustable voltage amplifying module 217, a tenth parallel driver 218, an eleventh adjustable voltage amplifying module 219, an eleventh parallel driver 220, a twelfth adjustable voltage amplifying module 221, a twelfth parallel driver 222, a second signal synchronizing module 223, a seventh parallel bias current driving module 224, a seventh set of LED/LD series modules 225, an eighth parallel bias current driving module 226, an eighth set of LED/LD series modules 227, a ninth parallel bias current driving module 228, a ninth set of LED/LD series modules 229, a tenth parallel bias current driving module 230, a ninth parallel bias current driving module 220, a ninth adjustable voltage amplifying module 220, a tenth adjustable voltage module 218, a eleventh adjustable voltage amplifying module 219, a eleventh parallel driver 220, a twelfth adjustable voltage amplifying module 221, a twelfth parallel driver 222, a second signal synchronizing module 223, a seventh parallel bias current driving module 224, a seventh set of LED/LD series modules, A tenth group of LED/LD series modules 231, an eleventh parallel bias current drive module 232, an eleventh group of LED/LD series modules 233, a twelfth parallel bias current drive module 234, and a twelfth group of LED/LD series modules 235.
A first output interface of the second signal processor 210 is sequentially connected with a seventh adjustable voltage amplification module 211, a seventh parallel driver 212, a second signal synchronization module 223, a seventh parallel bias current driving module 224 and a seventh LED/LD series module 225; a second output interface of the second signal processor 210 is sequentially connected to the eighth adjustable voltage amplifying module 213, the eighth parallel driver 214, the second signal synchronizing module 223, the eighth parallel bias current driving module 226, and the eighth LED/LD series module 227; a third output interface of the second signal processor 210 is sequentially connected to the ninth adjustable voltage amplifying module 215, the ninth parallel driver 216, the second signal synchronizing module 223, the ninth parallel bias current driving module 228, and the ninth LED/LD series module 229; a fourth output interface of the second signal processor 210 is sequentially connected to the tenth adjustable voltage amplification module 217, the tenth parallel driver 218, the second signal synchronization module 223, the tenth parallel bias current driving module 230, and the tenth LED/LD series module 231; a fifth output interface of the second signal processor 210 is sequentially connected with the eleventh adjustable voltage amplification module 219, the eleventh parallel driver 220, the second signal synchronization module 223, the eleventh parallel bias current driving module 232, and the eleventh LED/LD series module 233; a sixth output interface of the second signal processor 210 is sequentially connected to the twelfth adjustable voltage amplifying module 221, the twelfth parallel driver 222, the second signal synchronizing module 223, the twelfth parallel bias current driving module 234, and the twelfth set of LED/LD series module 235.
The seventh group of LED/LD serial module 225, the eighth group of LED/LD serial module 227, the ninth group of LED/LD serial module 229, the tenth group of LED/LD serial module 231, the eleventh group of LED/LD serial module 233 and the twelfth group of LED/LD serial module 235 are disposed on the same planar circuit light source board ii, a glass window capable of transmitting laser light is disposed on the wall surface of the second dry chamber high-pressure-resistant sealed chamber 201 in this embodiment, and preferably, the glass window is a hemispherical transparent sealed window; the light source plate II is arranged opposite to the glass window of the second dry cabin high-pressure-resistant sealed cabin 201. In other embodiments, the light source plate ii can be directly embedded in the wall of the second dry chamber hyperbaric pressure-proof sealed chamber 201.
The second signal processor 210 is configured to modulate and transmit a digital signal, receive a digital signal, and demodulate the digital signal, the seventh adjustable voltage amplification module 211, the eighth adjustable voltage amplification module 213, the ninth adjustable voltage amplification module 215, the tenth adjustable voltage amplification module 217, the eleventh adjustable voltage amplification module 219, and the twelfth adjustable voltage amplification module 221 are configured to amplify a data signal transmitted by the second signal processor 210, respectively, the seventh parallel driver 212, the eighth parallel driver 214, the ninth parallel driver 216, the tenth parallel driver 218, the eleventh parallel driver 220, and the twelfth parallel driver 222 are configured to perform parallel multi-level current driving on the serial LED/LD modules, and the second signal synchronization module 223 is configured to perform parallel multi-level current driving on the first driving signal output by the seventh parallel driver 212 and the second driving signal output by the eighth parallel driver 214, The third driving signal output by the ninth parallel driver 216, the fourth driving signal output by the tenth parallel driver 218, the fifth driving signal output by the eleventh parallel driver 220, and the sixth driving signal output by the twelfth parallel driver 222 are synchronized to synchronize the output light signals of the seventh LED/LD series module 225, the eighth LED/LD series module 227, the ninth LED/LD series module 229, the tenth LED/LD series module 231, the eleventh LED/LD series module 233, and the twelfth LED/LD series module 235.
The second receiving unit comprises a second signal sampling module 236, a second signal filtering module 237, a second signal amplifying module 238, a second photodetector 239, a second dichroic filter 240, a second color filter 241 and a second receiving lens 242 which are installed in the second dry cabin high pressure resistant sealed cabin 201;
the second photodetector 239, the second signal amplifying module 238, the second signal filtering module 237 and the second signal sampling module 236 are sequentially connected, and an output of the second signal sampling module 236 is connected to an input of the second signal processor 210; the second photodetector 239 is arranged opposite to the second receiving lens 242, the second receiving lens 242 is a convex lens, the second photodetector 239 is located at the focal position of the light beam of the second receiving lens 242, and the second dichroic filter 240 and the second color filter 241 are sequentially placed in an optical path between the second photodetector 239 and the second receiving lens 242; the second receiving lens 242 is disposed in the cavity of the second dry chamber capsule 201, the second receiving lens 242 is disposed opposite to the glass window of the second dry chamber capsule 201, and the light source plate ii and the second photodetector 239 share an optical axis.
The transmitting unit and the receiving unit of the second communication device 2 share the second signal processor 210; the emitting unit and the receiving unit share a hemispherical transparent sealing window, the LED/LD array light source plate is positioned on the central section of a hemisphere, and the light sensing surface of the second photoelectric detector 239 is positioned at the center of the hemisphere of the hemispherical receiving lens; the LED/LD array light source (light source plate II) and the second photodetector 239 share a common optical axis. In the prior art, the LED/LD light source and the large-area array photoelectric detector are isolated mainly through physical isolation, two sealing cabin bodies are mainly adopted to be physically isolated to realize the isolation in a receiving and transmitting separation mode, and therefore two devices need to be installed on each platform, and the communication function is realized. If the light source LED/LD light source and the photoelectric detector are installed in the same sealed cabin, the problems that the receiving and transmitting isolation degree cannot be ensured, the signal reflection at the home terminal is too large, and the signal demodulation at the opposite terminal cannot be ensured are caused, so that the invention adopts a combined mode of half-duplex, a color filter and a narrow-band filter, solves the isolation problem, and can greatly reduce the complexity and the cost of a system and expand the application range by the receiving and transmitting integration.
The system aims to realize effective large-angle emission, and an LED/LD single light source cannot meet the requirement, and a Gaussian distribution mode is presented, and cannot meet the requirement of large-angle uniform emission, so that the invention provides an LED/LD array mode to realize emission, based on secondary light distribution and reasonable layout, remote light field intensity distribution and system link calculation are carried out through LightTools, under the condition of ensuring low power consumption, heat dissipation and synchronization, 6 groups of LED/LD serial modules are optimal solutions, the effective emission angle of an LD light source is more than or equal to 120 degrees, and the effective emission angle of an LED is more than or equal to 150 degrees.
The working process of the underwater wireless optical communication device based on the LED/LD array transceiving integration in the embodiment is as follows:
the first signal processor 110 in the first communication device 1 generates and sends six paths of digital synchronization signals, which are the first path of signal, the second path of signal, the third path of signal, the fourth path of signal, the fifth path of signal and the second path of signal, respectively;
the first path of signal is amplified by the first adjustable voltage amplifying module 111, sent to the first parallel driver 112 for conversion, then sent to the first parallel bias current driving module 124 after entering the first signal synchronizing module 123 for multi-path synchronization, the first parallel bias current driving module 124 drives the first group of LED/LD series modules 125, so that the working voltage of the LED/LD is in a linear range, and a digital signal is modulated onto an optical signal; the second signal is amplified by the second adjustable voltage amplification module 113, sent to the second parallel driver 114 for conversion, then sent to the second parallel bias current driving module 126 after entering the first signal synchronization module 123 for multi-path synchronization, the second parallel bias current driving module 126 drives the second group of LED/LD series modules 127, so that the working voltage of the LED/LD is in a linear range, and a digital signal is modulated onto an optical signal; the third signal is amplified by the third adjustable voltage amplification module 115, sent to the third parallel driver 116 for conversion, then sent to the third parallel bias current driving module 128 after entering the first signal synchronization module 123 for multi-path synchronization, and the third parallel bias current driving module 128 drives the third group of LED/LD series modules 129, so that the working voltage of the LED/LD is in a linear range, and a digital signal is modulated onto an optical signal; the fourth signal is amplified by the fourth adjustable voltage amplification module 117, sent to the fourth parallel driver 118 for conversion, then sent to the fourth parallel bias current driving module 130 after entering the first signal synchronization module 123 for multi-path synchronization, and the fourth parallel bias current driving module 130 drives the fourth group of LED/LD series modules 131, so that the working voltage of the LED/LD is in a linear range, and the digital signal is modulated onto the optical signal; the fifth signal is amplified by the fifth adjustable voltage amplification module 119, sent to the fifth parallel driver 120 for conversion, and then sent to the fifth parallel bias current driving module 132 after entering the first signal synchronization module 123 for multi-path synchronization, the fifth parallel bias current driving module 132 drives the fifth set of LED/LD series modules 133, so that the working voltage of the LED/LD is in a linear range, and a digital signal is modulated onto an optical signal; the sixth signal is amplified by the sixth adjustable voltage amplification module 121, sent to the sixth parallel driver 122 for conversion, and then sent to the sixth parallel bias current driving module 134 after entering the multi-path synchronization of the first signal synchronization module 123, and the sixth parallel bias current driving module 134 drives the sixth group LED/LD series module 135, so that the working voltage of the LED/LD is in a linear range, and a digital signal is modulated onto an optical signal;
six LED/LD signals of six sets of LED/LD serial modules (a first set of LED/LD serial module 125, a second set of LED/LD serial module 127, a third set of LED/LD serial module 129, a fourth set of LED/LD serial module 131, a fifth set of LED/LD serial module 133, and a sixth set of LED/LD serial module 135) are synchronously output and transmitted to a second receiving lens 242 of the second communication device 2 through an underwater channel, a second color filter 241 and a second dichroic filter 240 are disposed on an optical path between the second receiving lens 242 and a second photodetector 239, the second color filter 241 and the second dichroic filter 240 filter background light and stray light and convert the background light and stray light into electrical signals through the second photodetector 239, the electrical signals are respectively amplified by a second signal amplifying module 238 and filtered by a second signal filtering module 237, the signal is sent to the second signal sampling module 236, and after the high-speed signal is sampled by the second signal sampling module 236, the signal enters the second signal processor 210 through the parallel high-speed communication interface, and the signal demodulation processing is performed on the input electrical signal, so that the one-way communication function is realized.
Meanwhile, the second signal processor 210 in the second communication device 2 generates and sends six paths of digital synchronization signals, which are a seventh path of signal, an eighth path of signal, a ninth path of signal, a tenth path of signal, an eleventh path of signal and a twelfth path of signal, respectively;
the seventh path of signal is amplified by the seventh adjustable voltage amplification module 211, sent to the seventh parallel driver 112 for conversion, then sent to the seventh parallel bias current driving module 224 after entering the multi-path synchronization of the second signal synchronization module 223, and the seventh parallel bias current driving module 224 drives the seventh group of LED/LD series modules 225, so that the working voltage of the LED/LD is in the linear range, and modulates the digital signal to the optical signal; the eighth signal is amplified by the eighth adjustable voltage amplification module 213, sent to the eighth parallel driver 214 for conversion, then sent to the eighth parallel bias current driving module 226 after entering the second signal synchronization module 223 for multi-path synchronization, and the eighth parallel bias current driving module 226 drives the eighth set of LED/LD serial modules 227, so that the working voltage of the LED/LD is in a linear range, and modulates a digital signal onto an optical signal; the ninth signal is amplified by the ninth adjustable voltage amplifying module 215 and sent to the ninth parallel driver for conversion 216, and then sent to the ninth parallel bias current driving module 228 after entering the second signal synchronizing module 223 for multi-path synchronization, the ninth parallel bias current driving module 228 drives the ninth set of LED/LD series module 229, so that the working voltage of the LED/LD is in the linear range, and the digital signal is modulated to the optical signal; the tenth signal is amplified by the tenth adjustable voltage amplifying module 217, sent to the tenth parallel driver 218 for conversion, then sent to the tenth parallel bias current driving module 230 after entering the second signal synchronizing module 223 for multi-path synchronization, the tenth parallel bias current driving module 230 drives the tenth LED/LD series module 231 to make the working voltage of the LED/LD in the linear range, and modulates the digital signal to the optical signal; the eleventh path of signal is amplified by the eleventh adjustable voltage amplification module 219, sent to the eleventh parallel driver 220 for conversion, and then sent to the eleventh parallel bias current driving module 232 after entering the second signal synchronization module 223 for multi-path synchronization, the eleventh parallel bias current driving module 232 drives the eleventh group of LED/LD series modules 233, so that the operating voltage of the LED/LD is in a linear range, and a digital signal is modulated onto an optical signal; the twelfth signal is amplified by the twelfth adjustable voltage amplifying module 221, sent to the twelfth parallel driver 222 for conversion, then sent to the twelfth parallel bias current driving module 234 after entering the second signal synchronizing module 223 for multi-path synchronization, the twelfth parallel bias current driving module 234 drives the twelfth set of LED/LD series modules 235, so that the working voltage of the LED/LD is in a linear range, and the digital signal is modulated onto the optical signal;
six LED/LD signals of six groups of LED/LD serial modules (a seventh group of LED/LD serial module 225, an eighth group of LED/LD serial module 227, a ninth group of LED/LD serial module 229, a tenth group of LED/LD serial module 231, an eleventh group of LED/LD serial module 233 and a twelfth group of LED/LD serial module 235) are synchronously output and transmitted to a first receiving lens 142 of the first communication device 1 through an underwater channel, a first color filter 141 and a first dichroic filter 140 are arranged on an optical path between the first receiving lens 142 and a first photodetector 139, the first color filter 141 and the first dichroic filter 140 filter background light and stray light and convert the background light and the stray light into electric signals through the first photodetector 139, the electric signals are respectively amplified by a first signal amplifying module 138, filtered by a first signal filtering module 137 noise and sampled by a first signal sampling module 136 at a high speed, and then enters the first signal processor 110 through the high-speed communication interface to perform signal demodulation processing, thereby realizing a bidirectional complete communication function.
The LED/LD arrays in the emitting units of the first communication device 1 and the second communication device 2 of the embodiment are reasonably arranged to realize high-power emission and simultaneous transmission of large-angle light fields, and the application of the technology aims to improve the capability and compatibility of establishing and maintaining an optical communication link and ensure that the link is quickly established and stably maintained in an underwater complex environment under the conditions that a platform is aligned and shaken, turbid seawater, dust generated in submarine exploration or construction processes and other submarine organisms are shielded by the optical communication system.
The photoelectric detectors in the receiving units of the first communication device 1 and the second communication device 2 adopt large-area-array high-sensitivity detectors, the intensity of a received optical signal is further improved through a receiving lens, background light and stray light are inhibited and eliminated through a color filter and a dichroic filter, the receiving sensitivity of the system is improved, and the communication distance and the receiving field of the system under the same water quality condition are improved.
Even if the platform of the optical communication equipment based on the high-power large-angle emission and wide view field receiving technology is aligned and shaken lowly, muddy water quality, raised dust, local shielding and other different environments, the system can be ensured to be capable of establishing a link and maintaining the link, so that the application range of the underwater wireless blue-green optical communication system is greatly improved, the system can be normally used in different sea areas and lake water, and meanwhile, the requirement on alignment between the carrying platforms is reduced.
The LED/LD array light sources in the transmitting units of the first and second communication devices 1 and 2 transmit, and the light source transmission power is large. As an auxiliary technical effect, the emission light source can also be used for underwater illumination and underwater platform recovery guide light sources.
Finally, it should be noted that the above-mentioned list is only a specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible, such as LED/LD arrays being replaced by LD arrays, single light source power being increased, number being decreased, emission increasing optical lenses, etc. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (8)
1. The utility model provides an integrative wireless blue-green light communication system under water based on LED/LD array receiving and dispatching which characterized in that: the device comprises two pressure-resistant sealed cabins and two communication devices respectively arranged in the two pressure-resistant sealed cabins;
each communication device comprises a transmitting unit, a signal processor and a receiving unit which are arranged in the pressure-resistant sealed cabin;
the transmitting unit comprises M adjustable voltage amplifying modules, M parallel drivers, 1 signal synchronizing module, M parallel bias current driving modules and M groups of LED/LD serial modules, wherein M is an integer and is more than or equal to 3 and less than or equal to 9;
the output of the signal processor is respectively connected with the inputs of the M adjustable voltage amplification modules, the outputs of the M adjustable voltage amplification modules are respectively connected with the inputs of the M parallel drivers, the outputs of the M parallel drivers are respectively connected with the inputs of the M parallel bias current driving modules through the signal synchronization module, and the outputs of the M parallel bias current driving modules are respectively connected with the inputs of the M groups of LED/LD serial modules;
the receiving unit comprises a signal sampling module, a signal filtering module, a signal amplifying module, a photoelectric detector and a receiving lens; the photoelectric detector is positioned at the focus position of the light beam of the receiving lens, and a light filtering component is arranged on a light path between the photoelectric detector and the receiving lens; the output of the photoelectric detector is connected with the input of the signal processor through a signal amplification module, a signal filtering module and a signal sampling module which are arranged in sequence;
the pressure-resistant sealed cabin is provided with a glass window, the glass window is of an arc-shaped structure protruding outwards, light source plates and receiving lenses of the M groups of LED/LD serial modules are arranged opposite to the glass window, and the light source plates and the photoelectric detectors share an optical axis;
or the light source plate and the receiving lens of the M groups of LED/LD serial modules are both arranged on the pressure-resistant sealed cabin, the position of the light source plate or the receiving lens arranged on the pressure-resistant sealed cabin is of an arc structure protruding outwards, and the light source plate and the photoelectric detector share an optical axis;
the two communication devices are oppositely arranged in an arc structure which is convex outwards; m paths of LED/LD signals synchronously output by the M groups of LED/LD serial modules of one communication device are transmitted to a receiving lens of the other communication device through a channel.
2. The underwater wireless blue-green light communication system based on the LED/LD array transceiving integration according to claim 1, characterized in that: the filtering component comprises a dichroic filter and a color filter which are sequentially arranged along a light path, and the dichroic filter is arranged close to the photoelectric detector.
3. The underwater wireless blue-green light communication system based on the LED/LD array transceiving integration according to claim 2, characterized in that: the photoelectric detector adopts a large-area array photoelectric detector.
4. The LED/LD array transceiving integrated underwater wireless blue-green light communication system according to claim 3, wherein:
the receiving lens is a lens which is convex in a direction opposite to the color filter.
5. The LED/LD array transceiving integrated underwater wireless blue-green light communication system according to any one of claims 1 to 4, wherein: and M is 6.
6. The LED/LD array transceiving based integrated underwater wireless blue-green light communication system according to claim 5, wherein: the M groups of LED/LD serial modules are arranged on the same plane circuit light source board.
7. The underwater wireless blue-green light communication system based on the LED/LD array transceiving integration according to claim 1, characterized in that: the glass window is a hemispherical transparent sealing window.
8. An underwater wireless blue-green light communication method based on LED/LD array transceiving is characterized in that the underwater wireless blue-green light communication system based on LED/LD array transceiving of any claim 1 to 7 is adopted, and the method comprises the following steps:
1.1) a signal processor of one of the communication devices transmits M paths of digital synchronous signals;
1.2) M digital synchronous signals are amplified by M adjustable voltage amplification modules and then sent to M parallel drivers, and are sent to M parallel bias current driving modules after multi-path synchronization of the signal synchronization modules, the M parallel bias current driving modules drive M groups of LED/LD serial modules, so that the working voltage of each LED/LD is in a linear range, and the digital signals are modulated onto optical signals, so that the M groups of LED/LD serial modules synchronously output M paths of LED/LD signals;
1.3) transmitting the M paths of LED/LD signals to a receiving lens of another communication device through an underwater channel, filtering background light and stray light by a filter assembly of a second communication device, and receiving the background light and the stray light by a photoelectric detector of the second communication device;
and 1.4) the photoelectric detector converts the received LED/LD signals into electric signals, and the electric signals enter a signal processor for signal demodulation processing after being sequentially amplified by a signal amplification module, filtered by noise of a signal filtering module and sampled by a high-speed signal sampling module, so that communication is realized.
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