Distributed scattering optical fiber underwater communication control system

Abstract

The present disclosure provides a distributed scattering optical fiber underwater communication control system. The system includes: an above-water transmitting unit for transmitting a first optical signal having a first wavelength; a transmission optical fiber, one end of which is connected to the above-water transmitting unit, and a plurality of light scattering points are provided at a preset position of the transmission optical fiber; a plurality of underwater transceivers, which are arranged at preset underwater positions, and respectively correspond to the light scattering points of the transmission optical fiber located underwater, so as to form an optical transmission channel with the light scattering points, thereby receiving the first optical signal transmitted by the above-water transmitting unit; an above-water receiving unit, which is arranged corresponding to the light scattering point of the transmission optical fiber arranged on the water surface, and forms an optical transmission channel with the light scattering point, so as to receive the optical signals transmitted by the plurality of underwater transceivers. The present disclosure combines underwater optical fiber communication with underwater wireless optical communication, which not only solves the problem of the communication distance of underwater optical signals, but also greatly increases the communication distance of underwater optical signals, and is more convenient for underwater networking and layout.

Description

Technical Field

[0001] The present disclosure relates to the field of underwater optical communication technology, and in particular to a distributed scattering optical fiber underwater communication control system. Background Art

[0002] The ocean, as the largest area on the earth's surface, accounts for 71% of the total surface area and contains abundant resources. However, with the increasing exploitation and consumption of land resources, the ocean has gradually attracted widespread attention. In this form, the demand for underwater fishing, detection and security has also become widespread. Therefore, the field of underwater communication has gradually become one of the research hotspots.

[0003] At present, the common communication methods in the field of underwater communication include underwater acoustic communication, underwater wireless radio frequency communication and underwater optical communication. Among them, underwater optical communication mainly includes two categories: underwater optical fiber communication and underwater wireless optical communication.

[0004] Underwater acoustic communication has the characteristics of long communication distance and mature technology development, but relying solely on underwater acoustic communication is not conducive to the rapid acquisition of underwater communication data, because the propagation speed of sound waves in water is only 1500m / s, and the frequency band involved can reach about 1MHz, so the frequency transmission efficiency is low. Underwater wireless radio frequency communication can achieve high-speed wireless duplex communication, and has strong anti-interference ability and low transmission delay, but it is limited by the short transmission distance and can only achieve underwater short-distance transmission. Different from underwater acoustic communication and underwater wireless radio frequency communication, underwater optical communication has the characteristics of high frequency, good directionality and strong anti-interference ability due to its optical carrier wave. The two main communication methods in the field of underwater optical communication are underwater wireless optical communication and underwater optical fiber communication. However, although underwater wireless optical communication is relatively easy in networking and layout, its communication distance is greatly limited due to the influence of factors such as seawater loss and turbulence during information transmission. At the same time, although underwater optical fiber communication has greatly improved in communication distance, it is very difficult in underwater networking and layout. Therefore, it is necessary to provide a new technical solution to improve one or more problems existing in the above solutions.

[0005] It should be noted that this section is intended to provide a background or context to the embodiments of the present disclosure as recited in the claims. No admission is made that the description herein is prior art by virtue of its inclusion in this section. Summary of the invention

[0006] The object of the present disclosure is to provide a distributed scattering optical fiber underwater communication control system, thereby overcoming one or more problems caused by limitations and defects of related technologies at least to some extent.

[0007] The present disclosure provides a distributed scattering optical fiber underwater communication control system, the system comprising:

[0008] An above-water transmitting unit, used for transmitting a first optical signal having a first wavelength;

[0009] A transmission optical fiber, one end of which is connected to the above-water transmitting unit, and a plurality of light scattering points are arranged at preset positions of the transmission optical fiber;

[0010] A plurality of underwater transceivers are arranged at preset underwater positions and respectively correspond to the light scattering points of the transmission optical fiber located underwater to form an optical transmission channel with the light scattering points, thereby receiving the first optical signal transmitted by the above-water transmitting unit;

[0011] The above-water receiving unit is arranged corresponding to the light scattering point where the transmission optical fiber is arranged on the water surface, and forms the light transmission channel with the light scattering point to receive the optical signals emitted by the multiple underwater transceiver units.

[0012] In an embodiment of the present disclosure, the system further includes:

[0013] The optical signal reflecting unit is arranged at the other end of the transmission optical fiber to reflect the optical signal emitted by the underwater transceiver unit to avoid the loss of the optical signal.

[0014] In an embodiment of the present disclosure, the underwater transceiver includes an underwater transmitting part and an underwater receiving part. The underwater transmitting part is used to transmit a second optical signal with a second wavelength, and the second optical signal enters the transmission optical fiber through the light scattering point and reaches the above-water receiving part; the underwater receiving part is used to receive the first optical signal, and the first optical signal passes through the transmission optical fiber and partially passes through the light scattering point to reach the underwater receiving part.

[0015] In an embodiment of the present disclosure, the underwater receiving unit includes a second wave splitter, and the second wave splitter is used to identify the first optical signal.

[0016] In an embodiment of the present disclosure, the above-water receiving unit includes a first wave splitter, and the first wave splitter is used to identify the second optical signal.

[0017] In an embodiment of the present disclosure, the first wavelength is 520 nm; the second wavelength is 450 nm.

[0018] In the embodiment of the present disclosure, the above-water transmitting unit and the underwater transmitting unit both include a power supply module, a laser transmitting module, a signal modulation module and a laser coupling module.

[0019] In the embodiment of the present disclosure, the above-water receiving unit and the underwater receiving unit both include an optical signal receiving module, a photoelectric conversion module, an electrical signal processing module and an information restoration control module.

[0020] In the embodiments of the present disclosure, the light scattering point can emit part of the optical signal in the transmission optical fiber, and the transmission optical fiber at the light scattering point includes a core, a cladding and a protective layer from the inside to the outside, and the cladding is a cladding whose refractive index is changed after pretreatment.

[0021] In an embodiment of the present disclosure, the pretreatment includes grinding or corrosion treatment.

[0022] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0023] In one embodiment of the present disclosure, according to the distributed scattering optical fiber underwater communication control system provided by this embodiment, a plurality of light scattering points are arranged on the transmission optical fiber, and are arranged correspondingly to the underwater transceiver part, so as to form an optical transmission channel between the light scattering points and the underwater transceiver part, so as to facilitate the mutual transmission of optical signals. This communication control system that combines underwater optical fiber communication with underwater wireless optical communication not only solves the problem of the communication distance of underwater optical signals, greatly increases the communication distance of underwater optical signals, but also makes this communication control system more convenient for underwater networking and layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a distributed scattering optical fiber underwater communication control system in an exemplary embodiment of the present disclosure is shown;

[0025] Figure 2 A schematic diagram showing a cross-section of an optical fiber at a light scattering point in an exemplary embodiment of the present disclosure;

[0026] Figure 3 A schematic diagram showing a longitudinal cross-section of an optical fiber at a light scattering point in an exemplary embodiment of the present disclosure;

[0027] Figure 4 A schematic diagram of the structure of a transmitting unit in an exemplary embodiment of the present disclosure is shown;

[0028] Figure 5 A schematic diagram of the structure of a receiving part in an exemplary embodiment of the present disclosure is shown.

[0029] In the figure: an above-water transmitting unit 101; a transmission optical fiber 102; an underwater transceiver unit 103; an above-water receiving unit 105; an optical signal reflecting unit 106; a power module 201; a laser transmitting module 202; a signal modulation module 203; a laser coupling module 204; an optical signal receiving module 301; a photoelectric conversion module 302; an electrical signal processing module 303; an information restoration control module 304; a fiber core 401; a cladding 402; and a protective layer 403. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the 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.

[0031] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0032] This example embodiment provides a distributed scattering optical fiber underwater communication control system. Figure 1 As shown in , the system may include an above-water transmitting unit 101 , a transmission optical fiber 102 , a plurality of underwater transceiver units 103 , and an above-water receiving unit 105 .

[0033] The above-water transmitting unit 101 is used to transmit a first optical signal having a first wavelength; one end of the transmission optical fiber 102 is connected to the above-water transmitting unit 101, and a plurality of light scattering points are provided at a preset position of the transmission optical fiber 102; a plurality of underwater transceivers 103 are arranged at preset underwater positions, and correspond to the light scattering points of the transmission optical fiber 102 located underwater, respectively, so as to form an optical transmission channel with the light scattering points, so as to receive the first optical signal transmitted by the above-water transmitting unit 101; the above-water receiving unit 105 is arranged corresponding to the light scattering point of the transmission optical fiber 102 located on the water surface, and forms the optical transmission channel with the light scattering point, so as to receive the optical signals transmitted by the plurality of underwater transceivers 103. .

[0034] According to the distributed scattering optical fiber underwater communication control system provided in this embodiment, a plurality of light scattering points are arranged on the transmission optical fiber 102, and are arranged correspondingly to the underwater transceiver 103, so as to form an optical transmission channel between the light scattering points and the underwater transceiver 103, so as to facilitate the mutual transmission of optical signals. This communication control system which combines underwater optical fiber communication with underwater wireless optical communication not only solves the problem of the communication distance of underwater optical signals, but also greatly increases the communication distance of underwater optical signals, and this communication control system is more convenient for underwater networking and layout.

[0035] Next, we will refer to Figures 1 to 5 Each structure of the above-mentioned communication control system in this exemplary embodiment is described in more detail.

[0036] In one embodiment, the transmission optical fiber 102 extends from above water to underwater, and a plurality of light scattering points are arranged along the length direction of the optical fiber. The light scattering points can transmit part of the optical signal in the optical fiber into the water channel. That is, when the optical signal in the optical fiber propagates along the length direction of the optical fiber, if it encounters an artificially set light scattering point, part of the optical signal will be scattered from the surface of the optical fiber through the light scattering point and received by the underwater receiving part corresponding to the scattering point. The end of the transmission optical fiber 102 above water is connected to the above water transmitting unit 101, and is used to receive the first optical signal with a first wavelength transmitted by the above water transmitting unit 101. The first optical signal propagates underwater along the length direction of the optical fiber. When encountering a light scattering point provided by the underwater optical fiber, part of the first optical signal is scattered by the light scattering point and received by the underwater transceiver 103 corresponding to the scattering point, and the underwater transceiver 103 and the corresponding light scattering point form an optical transmission channel. The first optical signal scattered by the light scattering point reaches the underwater transceiver 103 through the optical transmission channel. Similarly, the optical signal transmitted by the underwater transceiver 103 also reaches the light scattering point through the optical transmission channel, and then enters the optical fiber through the light scattering point, propagates along the length direction of the optical fiber and is finally received by the above water receiving unit 105. The above water receiving unit 105 is corresponding to the light scattering point on the optical fiber on the water surface, and the above water receiving unit 105 also forms an optical transmission channel with the corresponding light scattering point, which is used to receive the optical signal transmitted by the underwater transceiver 103. This method of integrating underwater optical fiber communication and underwater wireless optical communication not only solves the problem of communication distance of underwater optical signals, but also makes it easier to build and layout underwater networks.

[0037] In one embodiment, Figure 1 As shown, the system also includes an optical signal reflecting unit 106, which is arranged at the other end of the transmission optical fiber 102 to reflect the optical signal emitted by the underwater transceiver 103 to avoid the loss of the optical signal. Specifically, the optical signal transmitting unit is arranged at one end of the transmission optical fiber 102, that is, arranged at the tail of the optical fiber located underwater. In the entire workflow of the communication control system, when the optical signal is transmitted in the optical fiber, most of the energy will be transmitted along the optical fiber, and only a small part of the energy of the optical signal will be emitted from the light scattering point. Therefore, part of the optical signal will be transmitted at the tail of the underwater part of the optical fiber, so it is necessary to process the optical signal at the tail. Therefore, an optical signal reflecting device is connected to the tail to transmit the optical signal emitted from the tail in reverse order to effectively keep the transmission information confidential. It should be noted that the energy distribution ratio that can be emitted at the light scattering point can be controlled by humans according to actual conditions.

[0038] In one embodiment, Figure 1As shown, the underwater transceiver 103 includes an underwater transmitting part and an underwater receiving part. The underwater transmitting part is used to transmit a second optical signal with a second wavelength, and the second optical signal enters the transmission optical fiber 102 through the light scattering point and reaches the above-water receiving part 105; the underwater receiving part is used to receive the first optical signal, and the first optical signal passes through the transmission optical fiber 102 and partially passes through the light scattering point to reach the underwater receiving part.

[0039] Specifically, the underwater transmitting unit and the underwater receiving unit are both set corresponding to the light scattering points, and the underwater transmitting unit is used to transmit the second optical signal of the second wavelength, while the above-water transmitting unit 101 transmits the first optical signal of the second wavelength. In one example, the first wavelength is 520nm; the second wavelength is 450nm. Specifically, the setting of signals of different wavelengths can facilitate the receiving unit to identify different signals, thereby receiving them, and performing deep recognition processing on the received signals, which can increase the efficiency of the receiving unit in processing signals to a certain extent. The first optical signal emitted by the above-water transmitting unit 101 propagates underwater along the length direction of the optical fiber. When encountering a light scattering point provided by the underwater optical fiber, part of the first optical signal is scattered by the light scattering point and received by the underwater transceiver 103 corresponding to the scattering point. The underwater transceiver 103 and the corresponding light scattering point form an optical transmission channel. The first optical signal scattered by the light scattering point reaches the underwater transceiver 103 through the optical transmission channel. Similarly, the second optical signal emitted by the underwater transceiver 103 also reaches the light scattering point through the optical transmission channel, then enters the optical fiber through the light scattering point, propagates along the length direction of the optical fiber and is finally received by the above-water receiving unit 105. This method of integrating underwater optical fiber communication and underwater wireless optical communication not only solves the problem of communication distance of underwater optical signals, but also facilitates underwater networking and layout.

[0040] In one embodiment, the underwater receiving unit includes a second wave splitter, which is used to identify the first optical signal. Specifically, the underwater receiving unit is used to receive the first optical signal of the first wavelength emitted by the above-water transmitting unit 101, and the optical signal transmitting unit arranged at the tail of the optical fiber will reflect the first optical signal and the second optical signal existing in the optical fiber. Therefore, the optical signal entering the underwater receiving unit may include the first optical signal and the second optical signal, and the underwater receiving unit is equipped with a second wave splitter, which can make the first optical signal with the first wavelength enter the underwater receiving unit, thereby reducing the situation that the underwater receiving unit processes all the received optical signals one by one to a certain extent, thereby improving the efficiency of the underwater receiving unit in signal processing.

[0041] In one embodiment, the above-water receiving unit 105 includes a first wave splitter, and the first wave splitter is used to identify the second optical signal. Specifically, as described in the above embodiment, the first wave splitter installed in the above-water receiving unit 105 can only identify and process the second optical signal transmitted by the underwater transmitting unit, thereby reducing the situation where the above-water receiving unit 105 processes all the received optical signals one by one to a certain extent, thereby improving the efficiency of the above-water receiving unit 105 in signal processing.

[0042] In one embodiment, Figure 2 , 3 As shown, the light scattering point can radiate part of the optical signal in the transmission optical fiber 102, and the transmission optical fiber 102 at the light scattering point includes a core 401, a cladding 402 and a protective layer 403 from the inside to the outside, and the cladding 402 is a cladding 402 with a changed refractive index after pretreatment. Specifically, the setting of the light scattering point requires that the optical signal confined in the core 401 be scattered from the surface of the optical fiber and received by the corresponding transceiver, which requires breaking the light-limiting condition of the optical fiber. The method in this embodiment is to destroy the uniform distribution of the refractive index of the cladding 402, thereby creating a scattering point. In one example, the pretreatment includes polishing or corrosion treatment. Specifically, the cladding 402 can be treated by physical polishing or chemical corrosion to change the refractive index at the cladding 402. In addition, a layer of protective material is attached to the scattering point to complete the protection of the scattering point. Moreover, the protective material layer has a small absorption attenuation on the first wavelength of the first optical signal and the second wavelength of the second signal. This setting can not only protect the optical fiber from being exposed, but also make the optical fiber lose the light limiting condition at this position. Then, the optical signal will be divided into two paths at the light scattering point for continued transmission: one is to continue to transmit along the optical fiber; the other is to scatter from this position along the surface of the optical fiber.

[0043] In one embodiment, Figure 4 As shown, the above-water transmitting unit 101 and the underwater transmitting unit both include a power module 201, a laser transmitting module 202, a signal modulation module 203 and a laser coupling module 204. Specifically, the laser transmitting module 202 may be a semiconductor laser, which has the characteristics of safe use, good stability, small size and long service life. The laser coupling module 204 may use a convex lens coupling method, and may use a passive device focusing lens and a collimating lens to achieve the output of a parallel light beam. It should be noted that both the above-water transmitting unit 101 and the underwater transmitting unit may include a source encoder and a channel encoder, which may encode the laser signal emitted by the laser transmitting module 202 so as to be received and recognized by the corresponding underwater receiving unit. The working principle of the specific transmitting unit may be understood by referring to the prior art, and will not be described here.

[0044] In one embodiment, Figure 5 As shown, the above-water receiving unit 105 and the underwater receiving unit both include an optical signal receiving module 301, an optoelectronic conversion module 302, an electrical signal processing module 303 and an information restoration control module 304. Specifically, the optical signal receiving module 301 is composed of an optical receiving antenna, and its function is to collect the received optical signals onto the photodetector. The photodetector converts the received optical signal into an electrical signal, and then transmits the electrical signal to the electrical signal processing module 303, which is processed by the electrical signal processing module 303 and finally sent to the information restoration control module 304, which responds accordingly. Subsequently, the underwater transmitting unit will be triggered to emit a laser signal to its corresponding light scattering point, which will be received and responded by the above-water receiving part, completing the communication feedback of the communication control from the above-water to the underwater environment. It should be noted that both the above-water receiving unit 105 and the underwater receiving unit can include a source decoder and a channel decoder, which can decode the received optical signal so that the receiving unit receives the corresponding optical signal. The specific working principle of the receiving unit can be understood by referring to the prior art, and will not be repeated here.

[0045] According to the distributed scattering optical fiber underwater communication control system provided in this embodiment, a plurality of light scattering points are arranged on the transmission optical fiber 102, and are arranged correspondingly to the underwater transceiver 103, so as to form an optical transmission channel between the light scattering points and the underwater transceiver 103, so as to facilitate the mutual transmission of optical signals. This communication control system which combines underwater optical fiber communication with underwater wireless optical communication not only solves the problem of the communication distance of underwater optical signals, but also greatly increases the communication distance of underwater optical signals, and this communication control system is more convenient for underwater networking and layout.

[0046] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0049] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0051] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A distributed scattering optical fiber underwater communication control system, characterized in that: The system includes: An above-water transmitting unit, used for transmitting a first optical signal having a first wavelength; A transmission optical fiber, one end of which is connected to the above-water transmitting unit, and a plurality of light scattering points are arranged at preset positions of the transmission optical fiber; A plurality of underwater transceivers are arranged at preset underwater positions and respectively correspond to the light scattering points of the transmission optical fiber located underwater to form an optical transmission channel with the light scattering points, thereby receiving the first optical signal transmitted by the above-water transmitting unit; An above-water receiving unit is arranged corresponding to the light scattering point where the transmission optical fiber is arranged on the water surface, and forms the light transmission channel with the light scattering point to receive the optical signals transmitted by the plurality of underwater transceiver units; An optical signal reflecting unit is arranged at the other end of the transmission optical fiber to reflect the optical signal emitted by the underwater transceiver unit to prevent the optical signal from being lost; The light scattering point can emit part of the light signal in the transmission optical fiber, and the transmission optical fiber at the light scattering point includes a core, a cladding and a protective layer from the inside to the outside, and the cladding is a cladding whose refractive index is changed after being destroyed.

2. The communication control system according to claim 1, characterized in that: The underwater transceiver comprises an underwater transmitting part and an underwater receiving part, wherein the underwater transmitting part is used to transmit a second optical signal having a second wavelength, and the second optical signal enters the transmission optical fiber through the light scattering point and reaches the above-water receiving part; The underwater receiving part is used to receive the first optical signal, and the first optical signal reaches the underwater receiving part via the transmission optical fiber and partially passes through the light scattering point.

3. The communication control system according to claim 2, characterized in that: The underwater receiving unit includes a second wave splitter, and the second wave splitter is used to identify the first optical signal.

4. The communication control system according to claim 2, characterized in that: The above-water receiving unit includes a first wave splitter, and the first wave splitter is used to identify the second optical signal.

5. The communication control system according to claim 4, characterized in that: The first wavelength is 520 nm; the second wavelength is 450 nm.

6. The communication control system according to claim 2, characterized in that: The above-water transmitting unit and the underwater transmitting unit both include a power supply module, a laser transmitting module, a signal modulation module and a laser coupling module.

7. The communication control system according to claim 2, characterized in that: The above-water receiving part and the underwater receiving part both include an optical signal receiving module, a photoelectric conversion module, an electrical signal processing module and an information restoration control module.

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