CN113904725A - Underwater optical communication system and method thereof - Google Patents
Underwater optical communication system and method thereof Download PDFInfo
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- CN113904725A CN113904725A CN202111155756.XA CN202111155756A CN113904725A CN 113904725 A CN113904725 A CN 113904725A CN 202111155756 A CN202111155756 A CN 202111155756A CN 113904725 A CN113904725 A CN 113904725A
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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
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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
- H04B10/40—Transceivers
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
Abstract
The embodiment of the invention relates to an underwater optical communication system and method. The underwater optical communication system includes: the overwater transceiver is used for converting the control signal into an optical signal and coupling the optical signal into the optical fiber. The mode leakage device comprises connecting parts arranged at two ends and leakage parts integrally connected with the connecting parts at the two ends, the leakage parts are optical fibers with thinned diameters and used for leaking optical signals, the connecting parts at the two ends are optical fibers with unchanged diameters and used for embedding the mode leakage device into a path of the optical fibers, and the reflection parts are used for reflecting the optical signals leaked from the leakage parts to the direction of the underwater transceiver. The underwater transceiver is used for receiving the optical signal transmitted by the mode leakage device, converting the optical signal into a control signal, executing response, transmitting a feedback optical signal to the mode leakage part and receiving the feedback optical signal by the overwater receiver. The embodiment of the invention realizes the bidirectional communication between water and the flexibility of underwater control and realizes the long-distance transmission of optical signals by combining the optical fiber and the wireless optical communication.
Description
Technical Field
The embodiment of the invention relates to the technical field of underwater communication, in particular to an underwater optical communication system and an underwater optical communication method.
Background
The importance of the ocean has attracted attention in recent years, and many countries and organizations have incorporated it into their strategic placement with the aim of promoting their international position through the ocean. In addition, under the background that land resources are increasingly scarce, oceans have more abundant resources than the land, and open up a new road for the further development of the human society. Therefore, the fields of underwater fishing, detection, security and the like are gradually developed. Meanwhile, the field of underwater communication is also becoming one of the research hotspots gradually.
In the related art, the field of underwater communication mainly includes underwater acoustic communication, underwater radio frequency communication, and underwater optical communication. Although the underwater acoustic communication technology is developed, high-speed communication cannot be realized due to low transmission frequency. Underwater radio frequency communication is limited to a short transmission distance, so that only underwater short-distance communication can be realized at present. Due to the characteristics of high carrier frequency, strong anti-interference capability and good directivity, optical communication plays an important role in the communication field in recent years, and is currently applied to communication in an underwater environment. The underwater optical communication is mainly divided into underwater wireless optical communication and underwater optical fiber communication. Although underwater wireless optical communication has strong flexibility and can be well adapted to complex water body environment, the underwater wireless optical communication is not favorable for long-distance communication because of larger transmission loss. Compared with underwater wireless optical communication, underwater optical fiber communication has greatly improved communication distance, but has certain difficulty in underwater layout and networking, has poor flexibility, and cannot be well adapted to underwater complex and variable water body environment.
With regard to the above technical solutions, the inventors have found that at least some of the following technical problems exist: for example, the method aims at the problem of large transmission loss in underwater wireless optical communication and the problems of difficult layout and networking and poor flexibility in underwater optical fiber communication.
Accordingly, there is a need to ameliorate one or more of the problems with the related art solutions described above.
It is noted that this section is intended to provide a background or context to the inventive concepts recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Disclosure of Invention
An object of embodiments of the present invention is to provide an underwater optical communication system and a method thereof, which overcome one or more of the problems due to the limitations and disadvantages of the related art, at least to a certain extent.
According to a first aspect of embodiments of the present invention, there is provided an underwater optical communication system, comprising:
the device comprises an overwater transceiver, an underwater transceiver, a mode leakage device and an optical fiber;
the overwater transmitting and receiving device comprises an overwater transmitting part arranged on water, and the overwater transmitting part is used for converting a control signal into an optical signal and transmitting the optical signal to the optical fiber;
the mode leakage device comprises connecting parts arranged at two ends and leakage parts integrally connected with the connecting parts at the two ends, the leakage parts are optical fibers with thinned diameters and used for leaking the optical signals, the connecting parts at the two ends are optical fibers with unchanged diameters and used for embedding the mode leakage device into a path of the optical fibers, and the mode leakage device also comprises a reflection part which is arranged around the leakage parts and used for reflecting the optical signals leaked from the leakage parts to the direction of the underwater transceiver;
the underwater transceiver is arranged around the mode leakage and used for receiving the optical signal transmitted by the mode leakage device, converting the optical signal into the control signal and executing response according to the control signal.
In an embodiment of the present invention, the above-water transceiver further includes an above-water receiving unit, and the above-water transmitting unit and the above-water receiving unit connect the above-water transmitting unit and the above-water receiving unit to the same optical fiber path through a Y-shaped beam splitter.
In an embodiment of the present invention, after the underwater transceiver transmits a response to the mode leakage device, the feedback is transmitted to the above-water receiving portion of the above-water transceiver through the optical fiber.
In an embodiment of the present invention, the underwater transmitting/receiving device only responds to the optical signal including the predetermined code according to the predetermined code.
In an embodiment of the present invention, the mode leakage devices are respectively disposed at a plurality of different positions under water, and are embedded in the same optical fiber path through the optical fibers.
In an embodiment of the present invention, the underwater transceiver corresponds to the mode leakage device one to one.
In an embodiment of the present invention, the optical fiber path further includes a reflecting device, and the reflecting device is disposed at the tail end of the optical fiber path and is configured to block the optical signal sent to the tail end of the optical fiber path.
In an embodiment of the present invention, the underwater transceiver further includes an optical wavelength division unit, and the optical wavelength division unit is configured to identify optical signals with different wavelengths.
In an embodiment of the invention, the above-water transceiver further includes a coupling unit, and the coupling unit is configured to enable the optical signal to be transmitted as a parallel beam and transmitted into the optical fiber.
According to a second aspect of embodiments of the present invention, there is provided a method of underwater optical communication, comprising:
converting the control signal into an optical signal on the water and transmitting the optical signal into an optical fiber path;
leaking the optical signal out through a tapered optical fiber in the optical fiber path under water;
reflecting the leaked optical signal to the direction of the underwater transceiver;
after the underwater transceiver receives the optical signal, converting the optical signal into the control signal, and controlling the underwater transceiver to execute response according to the control signal;
and after the underwater transceiver device executes response, converting a response result into an optical signal for transmission, transmitting the optical signal to the optical fiber through the mode leakage device, and receiving the optical signal by the overwater transceiver device.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
in the embodiment of the invention, through the underwater optical communication system and the method thereof, on one hand, the mode leakage device transmits optical signals to the underwater transceiver wirelessly underwater, thereby realizing the flexibility of controlling the underwater transceiver; on the other hand, the long-distance transmission of the optical signal is realized through the connection of the optical fiber and the mode leakage device.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 illustrates a schematic diagram of an underwater optical communication system in an exemplary embodiment of the invention;
FIG. 2 shows a schematic view of a water borne transceiver in an exemplary embodiment of the invention;
FIG. 3 shows a schematic view of an underwater transceiver in an exemplary embodiment of the invention;
FIG. 4 shows a schematic diagram of a coupling unit structure in an exemplary embodiment of the invention;
FIG. 5 shows a schematic view of a mode leak apparatus in an exemplary embodiment of the invention;
FIG. 6 shows a schematic view of a mode leak apparatus in an exemplary embodiment of the invention;
FIG. 7 shows a flow diagram of an underwater optical communication method in an exemplary embodiment of the invention;
reference numerals: the underwater transmitting and receiving device comprises an overwater transmitting part 100, an overwater transmitting part 110, an overwater receiving part 120, a coupling unit 130, a mode leakage device 200, a connecting part 210, a leakage part 220, a reflection part 230, an underwater transmitting and receiving device 300, an optical fiber 400 and a reflection device 500.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of embodiments of the invention, which are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
The exemplary embodiment first provides an underwater optical communication system. Referring to fig. 1, the underwater optical communication system may include: an above-water transceiver 100, an underwater transceiver 300, a mode-leakage device 200, and an optical fiber 400.
The above-water transceiver 100 includes an above-water transmitting unit 110 disposed above water, and the above-water transmitting unit 110 is configured to convert the control signal into an optical signal and transmit the optical signal to the optical fiber 400. The mode leakage apparatus 200 includes connection parts 210 provided at both ends and a leakage part 220 integrally connected to the connection parts 210 at both ends, the leakage part 220 is an optical fiber 400 having a reduced diameter for leaking an optical signal, the connection parts 210 at both ends are optical fibers 400 having a constant diameter for embedding the mode leakage apparatus 200 into a path of the optical fiber 400, the mode leakage apparatus 200 further includes a reflection part 230, the reflection part 230 is provided around the leakage part 220 for reflecting the optical signal leaked from the leakage part 220 toward a direction in which the underwater transceiver 300 is located. The underwater transceiver 300 is disposed around the pattern leakage, and is configured to receive the optical signal transmitted by the pattern leakage apparatus 200, convert the optical signal into a control signal, and perform a response according to the control signal.
It should be understood that the transmitting portion and the receiving portion of the marine transceiver 100 may each operate as separate components. The transmitting section of the marine transceiver 100 may include a laser transmitting section, a signal modulating section, and a laser coupling section. The laser emitting part adopts a semiconductor laser, and has the characteristics of wide wavelength range, good stability, long service life and the like. In the communication, 520nm and 450nm lasers are adopted, wherein the 520nm laser is used for downlink communication, and the 450nm laser is used for uplink communication. The signal modulation part adjusts the emitted laser according to the control signal to be sent to form an optical signal. The laser coupling portion couples the emitted optical signal into the optical fiber 400 for transmission. In the coupling, a condenser lens may be used to obtain a parallel beam transmission into the optical fiber 400.
It should also be understood that, referring to fig. 2, the underwater transceiver 300 may include optical signal receiving, optical-to-electrical conversion, electrical signal processing, and information recovery control modules. The optical signal receiving section is constituted by an optical receiving antenna and functions to transmit the received optical signal to the photodetector. The photoelectric detector converts the received optical signal into an electric signal, and the electric signal is processed by the electric signal processing module and finally sent to the information restoration control module and responds correspondingly by the information restoration control module. The underwater receiving device can be specific execution equipment for underwater fishing, underwater detection, underwater security and the like, and can execute remote control such as movement, detection and the like according to the received control signal.
It is also understood that, referring to fig. 5, the leakage portion 220 of the mode leakage apparatus 200 may be composed of a core of a thinned and bare optical fiber 400 and a transparent protective material. The connection portions 210 at the two ends connect the two transmission fibers 400, so that the optical signal transmitted in the transmission fibers 400 can continue to be transmitted along the transmission fibers 400. Due to the tapered diameter of the optical fiber 400, based on the mode leakage theory of the optical fiber 400, the optical signal of the partial mode cannot be continuously transmitted along the optical fiber 400, and further, the optical signal is separated from the optical fiber 400, enters the water through the transparent protective material, and is finally received by the corresponding underwater transceiver 300. Referring to fig. 6, the reflection part 230 of the mode leakage device 200 may be a mirror disposed near the leakage part 220, and is connected to the surface of the transmission fiber 400, and may change most of light into parallel light transmitted toward the corresponding underwater transceiver 300, and the optical path may be reversible, so as to be applied to the transmission of an uplink signal, that is, the mode leakage device 200 may receive a feedback signal transmitted from the underwater transceiver 300 and transmit the feedback signal into the path of the fiber 400.
It should also be understood that underwater wireless optical signal propagation is of a range, typically only a few hundred meters, and thus, the underwater transceiver 300 is disposed around a mode leak, i.e., within a range where the underwater transceiver 300 can receive optical signals.
Through the underwater optical communication system, on one hand, the mode leakage device transmits optical signals to the underwater transceiver wirelessly underwater, so that the underwater transceiver is flexibly controlled; on the other hand, the long-distance transmission of the optical signal is realized through the connection of the optical fiber and the mode leakage device.
Next, each part of the above-described underwater optical communication system in the present exemplary embodiment will be described in more detail with reference to fig. 1 to 6.
In one embodiment, referring to the illustration in fig. 3, the underwater transceiver 300, after performing a response, transmits a feedback signal to the mode leak device 200 and transmits to the topside receiving part 120 of the topside transceiver 100 through the optical fiber 400. It should be understood that the feedback signal transmitted by the underwater transceiver 300 may be feedback information indicating that the underwater transceiver 300 has received the control signal, may also be feedback information indicating that the underwater transceiver 300 has completed executing a corresponding response, and may also be feedback information indicating that the underwater transceiver 300 has collected (e.g., information about water quality, surrounding environment, etc.). By transmitting the feedback signal through the underwater transmitting/receiving device 300, an operator or a control center can better control the underwater transmitting/receiving device 300.
In one embodiment, referring to fig. 1, the overwater transmitting and receiving device 100 further comprises an overwater receiving portion 120, and the overwater transmitting portion 110 and the overwater receiving portion 120 connect the overwater transmitting portion 110 and the overwater receiving portion 120 with the same optical fiber path through a Y-shaped beam splitting device. It should be understood that the above-water receiving part 120 is used for receiving the feedback signal, and the Y-shaped beam splitting device is used for merging two optical fiber paths into one optical fiber path or splitting one optical fiber path into two optical fiber paths. By having the marine transmitting portion 110 and the marine receiving portion 120 independent of each other, the transmitted and received optical signals can be more efficiently processed.
In one embodiment, referring to the illustration in fig. 1, the underwater transmitting and receiving device 300 performs a response only to the optical signal containing the agreed code according to the agreed code in advance. It should be understood that each of the undersea transceiver devices 300 may be differently coded, and that the undersea transceiver devices 300 may only respond if they match the optical signal code carrying the modulation information. The control signals are more targeted, and can be independently controlled for each underwater transmitting and receiving device 300.
In one embodiment, referring to fig. 1, mode leak devices 200 are respectively disposed at a plurality of different locations under water and embedded in the same optical fiber path through optical fibers 400. It should be understood that, during the transmission of the optical signal in the optical fiber path, the optical signal will leak out when passing through the mode leakage apparatus 200, but will still continue to be transmitted in the optical fiber path, that is, the mode leakage apparatus 200 at a plurality of different positions of the same optical signal will emit the optical signal, and make the underwater transceivers 300 around the same optical signal receive the optical signal.
In one embodiment, referring to the illustration in fig. 1, the underwater transceiver 300 corresponds to the pattern leakage apparatus 200 one to one. It should be understood that, through the one-to-one correspondence between the underwater transceiver devices 300 and the mode leakage devices 200, each mode leakage device 200 always directs the optical signal to the corresponding underwater transceiver device 300, so that the signal transmission is more stable and faster.
In one embodiment, the underwater transceiver 300 further includes an optical wavelength splitting unit for identifying optical signals of different wavelengths. It should be understood that the optical branching unit may be a blue-green optical branching filter, and the direction of the optical signal is controlled by identifying the optical signal with different wavelengths, so as to identify whether the optical signal is used for downlink communication or uplink communication.
In one embodiment, referring to fig. 4, the marine transceiver 100 further comprises a coupling unit 130, the coupling unit 130 being configured to transmit the transmitted optical signal as a parallel beam into an optical fiber 400. It should be understood that the optical signal is coupled through the coupling unit 130, and then the optical signal is arranged into a parallel beam, so that the propagation of the optical signal is more stable. Specifically, upon coupling, a condensing lens or a convex lens may be used to obtain a parallel beam transmitted into the optical fiber 400.
In one embodiment, referring to fig. 6, a reflection device 500 is further included, and the reflection device 500 is disposed at the tail end of the optical fiber path for reflecting the optical signal transmitted to the tail end of the optical fiber path. It will be appreciated that the provision of the reflecting means 500 for the optical signal at the rear of the transmission fibre 400 avoids the optical signal at the rear of the transmission fibre 400 leaking into the water, increasing the security of the overall communication system. In addition, the optical signal leaked at the mode leakage device 200 can be enhanced.
The example embodiment also provides an underwater optical communication method. Referring to fig. 7, the underwater optical communication method may include:
step S101, converting the control signal into an optical signal on water and transmitting the optical signal to the path of the optical fiber 400;
step S102, leaking out optical signals through the optical fiber 400 with the diameter reduced in the path of the underwater optical fiber 400;
step S103, reflecting the leaked optical signal to the direction of the underwater transmitting-receiving device 300;
step S104, after the underwater transceiver 300 receives the optical signal, converting the optical signal into a control signal, and controlling the underwater transceiver 300 to respond according to the control signal;
step S105, after the underwater transceiver 300 performs a response, converts the response result into an optical signal for transmission, transmits the optical signal to the optical fiber 400 through the mode leakage device 200, and is received by the above-water transceiver 100.
It should be understood that when the optical fiber 400 with the reduced diameter transmits an optical signal to the optical fiber 400, the optical signal is separated from the optical fiber 400, and based on the combination of the optical fiber 400 with the leakage function and the wireless interactive underwater optical communication system, the underwater optical communication method combines the advantages of underwater optical fiber communication and underwater wireless optical communication, and information transmission is performed by using the underwater optical fiber communication and underwater wireless optical communication interaction mode together.
According to the underwater optical communication method, on one hand, the thinned optical fiber transmits optical signals to the underwater transceiver wirelessly underwater, so that the underwater transceiver is flexibly controlled; on the other hand, long-distance transmission of optical signals is achieved through an integral optical fiber path.
It is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like in the foregoing description are used for indicating or indicating the orientation or positional relationship illustrated in the drawings, and are used merely for convenience in describing embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (10)
1. An underwater optical communication system, comprising:
the device comprises an overwater transceiver, an underwater transceiver, a mode leakage device and an optical fiber;
the overwater transmitting and receiving device comprises an overwater transmitting part arranged on water, and the overwater transmitting part is used for converting a control signal into an optical signal and transmitting the optical signal to the optical fiber;
the mode leakage device comprises connecting parts arranged at two ends and leakage parts integrally connected with the connecting parts at the two ends, the leakage parts are optical fibers with thinned diameters and used for leaking the optical signals, the connecting parts at the two ends are optical fibers with unchanged diameters and used for embedding the mode leakage device into a path of the optical fibers, and the mode leakage device also comprises a reflection part which is arranged around the leakage parts and used for reflecting the optical signals leaked from the leakage parts to the direction of the underwater transceiver;
the underwater transceiver is arranged around the mode leakage and used for receiving the optical signal transmitted by the mode leakage device, converting the optical signal into the control signal and executing response according to the control signal.
2. The underwater optical communication system of claim 1, wherein the above-water transceiver further comprises an above-water receiving portion, and the above-water transmitting portion and the above-water receiving portion connect the above-water transmitting portion and the above-water receiving portion to the same optical fiber path through a Y-shaped beam splitting device.
3. The undersea optical communication system of claim 2 wherein said undersea transceiver device, upon performing a response, transmits a feedback signal to said mode leakage device and through said optical fiber to said above-water receiving portion of said above-water transceiver device.
4. The underwater optical communication system of claim 1, wherein the underwater transceiver device performs a response only to the optical signal including the agreed code according to a pre-agreed code.
5. The undersea optical communication system of claim 1 wherein said mode-leaking device is disposed at a plurality of different locations respectively underwater and embedded in the same optical fiber path through said optical fiber.
6. The undersea optical communication system of claim 1 wherein said undersea transceiver devices are in one-to-one correspondence with said mode leakage devices.
7. The underwater optical communication system of claim 1, wherein the underwater transceiver further comprises an optical demultiplexing unit, and the optical demultiplexing unit is configured to identify optical signals with different wavelengths.
8. The undersea optical communication system of claim 1 wherein said above-water transceiver further comprises a coupling unit for causing said optical signal to be transmitted as a parallel beam and into said optical fiber.
9. The undersea optical communication system of any one of claims 1-8 further comprising a reflecting means disposed at the trailing end of said optical fiber path for reflecting said optical signal transmitted to the trailing end of said optical fiber path.
10. A method for use in an underwater optical communication system according to any of claims 1 to 9, comprising:
converting the control signal into an optical signal on the water and transmitting the optical signal into an optical fiber path;
leaking the optical signal out through a tapered optical fiber in the optical fiber path under water;
reflecting the leaked optical signal to the direction of the underwater transceiver;
after the underwater transceiver receives the optical signal, converting the optical signal into the control signal, and controlling the underwater transceiver to execute response according to the control signal;
and after the underwater transceiver device executes response, converting a response result into an optical signal for transmission, transmitting the optical signal to the optical fiber through the mode leakage device, and receiving the optical signal by the overwater transceiver device.
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| CN114414492A (en) * | 2022-01-19 | 2022-04-29 | 西安邮电大学 | Water attenuation coefficient measuring system |
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