Optical repeater structure for deep-sea synaesthesia fusion and deep-sea submarine cable system

Abstract

The present invention relates to an optical repeater structure and a deep-sea submarine cable system for deep-sea interaesthesia fusion, wherein the first coupler of the optical repeater structure is connected to a plurality of single-mode optical fibers, the plurality of single-mode optical fibers include a single-mode optical fiber for transmitting a communication signal and a single-mode optical fiber for transmitting a coupled signal, the coupled signal includes a communication signal and a modulated perception signal, the single-mode optical fiber for transmitting the communication signal is connected to the input end of the third coupler, the single-mode optical fiber for transmitting the coupled signal is connected to the input end of the second coupler, the sensor module is connected to the input end of the second coupler through the coherent light modulation module, the output end of the second coupler is connected to the input end of the third coupler, and the output end of the third coupler is connected to a multi-core optical fiber. The present invention effectively ensures the capacity of the communication signal while ensuring the transmission of the perception signal.

Description

Technical Field

[0001] The present invention relates to the technical field of optical repeaters, and in particular to an optical repeater structure and a deep-sea submarine cable system for deep-sea synaesthesia fusion. Background Art

[0002] Deep-sea observation is an important means of understanding Earth science and can also be used for disaster warning. At the same time, submarine optical cables, which are mainly used as communication equipment, have the advantages of long-term submarine operations. Therefore, the use of submarine optical cables to achieve observation of deep-sea physical quantities (strain, temperature) has the advantages of low cost, high reliability, and long time. In summary, the fusion of communication and perception (synaesthesia fusion) based on submarine optical cables has important advantages and potential.

[0003] In the existing methods, by embedding various sensors (temperature sensors, strain sensors, acceleration sensors, etc.) in the repeaters of submarine optical cables, deep-sea observation based on submarine cables can be realized, which is called SMART cable. Although multiple types of sensors are embedded in the repeater, these sensing signals need to be sent to the shore with the help of submarine optical cables in order to realize the processing and analysis of sensor data. However, there are limitations in the transmission of sensing signals of SMART cables reported at this stage: the transmission of sensing signals needs to occupy the physical optical fiber channels originally used for communication, and the number of physical optical fiber channels originally used for communication decreases, resulting in a reduction in communication capacity.

[0004] In summary, it is necessary to solve the problem of decreased communication capacity of SMART cable due to the transmission of sensing signals. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the communication capacity of the SMART cable decreases due to the transmission of the sensing signal.

[0006] In order to solve the above technical problems, the present invention provides an optical repeater structure for deep-sea synaesthesia fusion, comprising a first coupler, a second coupler, a third coupler, a coherent light modulation module and a sensor module, wherein:

[0007] The first coupler is connected to a plurality of single-mode optical fibers, the plurality of single-mode optical fibers include a single-mode optical fiber for transmitting a communication signal and a single-mode optical fiber for transmitting a coupled signal, the coupled signal includes a communication signal and a modulated sensing signal, the single-mode optical fiber for transmitting the communication signal is connected to an input end of the third coupler, the single-mode optical fiber for transmitting the coupled signal is connected to an input end of the second coupler, the sensor module is connected to the input end of the second coupler through the coherent light modulation module, the output end of the second coupler is connected to the input end of the third coupler, and the output end of the third coupler is connected to a multi-core optical fiber;

[0008] The sensor module is used to obtain perception signals about the deep sea; the coherent light modulation module is used to perform coherent light modulation on the perception signals obtained by the sensor module to obtain modulated perception signals; the second coupler is used to couple communication signals of different wavelengths with the modulated perception signals to obtain the coupled signals; the output end of the third coupler transmits the communication signals and the coupled signals to the outside through a multi-core optical fiber.

[0009] In one embodiment of the present invention, the single-mode optical fiber for transmitting the communication signal is also connected to a first single-mode optical fiber amplifier, and the first single-mode optical fiber amplifier is used to compensate for the power loss of the communication signal.

[0010] In one embodiment of the present invention, the coherent optical modulation module modulates the sensing signal onto a digital subcarrier at a preset interval by a coherent optical modulation method, and the preset interval ranges from 0 to 100 MHz.

[0011] In one embodiment of the present invention, the number of cores of the multi-core optical fiber is consistent with the number of the single-mode optical fiber.

[0012] In one embodiment of the present invention, among the plurality of single-mode optical fibers, only one single-mode optical fiber is used to transmit coupling signals, and the remaining single-mode optical fibers are used to transmit communication signals.

[0013] In one embodiment of the present invention, the first coupler is a fan-out coupler.

[0014] In one embodiment of the present invention, the second coupler is a wavelength division multiplexing coupler.

[0015] In one embodiment of the present invention, the third coupler is a fan-in coupler.

[0016] In one embodiment of the present invention, the sensor module includes a temperature sensor, a strain sensor, and an acceleration sensor. The temperature sensor is used to monitor the deep sea temperature, the strain sensor is used to monitor the structural deformation of the optical repeater caused by deep sea waves, and the acceleration sensor is used to monitor the acceleration of deep sea waves. The signals monitored by the temperature sensor, the strain sensor, and the acceleration sensor are the perception signals.

[0017] The communication capacity of the multi-core optical fiber at the output end of the third coupler is:

[0018] ;

[0019] in, represents the communication capacity of the multi-core optical fiber at the output end of the third coupler, It indicates the number of spatial channels when the single-mode optical fiber used to transmit communication signals and the single-mode optical fiber used to transmit coupled signals are space-division multiplexed. Indicates the number of wavelength divisions in each spatial channel when the second coupler performs wavelength division multiplexing, Indicates the signal-to-noise ratio of a multi-core optical fiber.

[0020] In order to solve the above technical problems, the present invention provides a deep-sea submarine cable system, comprising a plurality of the above-mentioned optical repeater structures for deep-sea synaesthesia fusion.

[0021] In one embodiment of the present invention, for The second coupler is provided with a preset number of second single-mode fiber amplifiers, and the second single-mode fiber amplifiers are used to compensate for the power loss of the coupled signal. The number of the second single-mode fiber amplifiers is:

[0022] ;

[0023] in, is the number of the second single-mode fiber amplifier, is the loss of a single span of submarine cable, is the gain of a single second single-mode fiber amplifier, is the total length of the deep-sea cable, is the single span length between adjacent optical repeater structures, To represent the minimum value.

[0024] The above technical solution of the present invention has the following advantages compared with the prior art:

[0025] The optical repeater structure constructed by the present invention can significantly reduce the wavelength bandwidth occupied by multiple perception signals by modulating the perception signals onto digital subcarriers with narrower intervals, and can effectively alleviate the problem of decreased communication capacity caused by SMART cable interawareness fusion.

[0026] The number of second single-mode optical fiber amplifiers built into the wavelength division multiplexing coupler of the deep-sea submarine cable system of the present invention is variable, which reduces the burden of the deep-sea submarine cable system and effectively saves resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the structure of the optical repeater used for deep-sea synaesthesia fusion of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0030] Reference Figure 1 As shown, the present invention relates to an optical repeater structure for deep-sea synaesthesia fusion, which is a new type of SMART cable, comprising a first coupler, a second coupler, a third coupler, a coherent light modulation module and a sensor module, wherein:

[0031] The first coupler is connected to a plurality of single-mode optical fibers, the plurality of single-mode optical fibers include a single-mode optical fiber for transmitting a communication signal and a single-mode optical fiber for transmitting a coupled signal, the coupled signal includes a communication signal and a modulated sensing signal, the single-mode optical fiber for transmitting the communication signal is connected to an input end of the third coupler, the single-mode optical fiber for transmitting the coupled signal is connected to an input end of the second coupler, the sensor module is connected to the input end of the second coupler through the coherent light modulation module, the output end of the second coupler is connected to the input end of the third coupler, and the output end of the third coupler is connected to a multi-core optical fiber;

[0032] The sensor module is used to obtain perception signals about the deep sea; the coherent light modulation module is used to perform coherent light modulation on the perception signals obtained by the sensor module to obtain modulated perception signals; the second coupler is used to couple communication signals of different wavelengths with the modulated perception signals to obtain the coupled signals; the output end of the third coupler transmits the communication signals and the coupled signals to the outside through a multi-core optical fiber.

[0033] Since traditional SMART cables have deep-sea sensing capabilities in addition to communication, the repeaters located on the seabed need to transmit the sensing signals to the data center on the shore for data processing and analysis. Therefore, the sensing signals need to occupy the transmission channels of the communication signals, which will reduce the number of transmission channels originally used for communication signals and lead to a decrease in communication capacity. In this regard, this embodiment uses narrower digital subcarriers instead of traditional wavelengths for the modulation and transmission of sensing signals. The total occupied wavelength of the sensing signals is greatly reduced, effectively alleviating the decrease in communication capacity.

[0034] Furthermore, the single-mode optical fiber used to transmit the communication signal is also connected to a single-mode optical fiber amplifier, and the single-mode optical fiber amplifier is used to compensate for the power loss of the communication signal.

[0035] Furthermore, the coherent optical modulation module modulates the sensing signal onto a digital subcarrier with a preset interval by a coherent optical modulation method, and the preset interval ranges from 0 to 100 MHz.

[0036] Furthermore, the number of cores of the multi-core optical fiber is consistent with the number of the single-mode optical fiber.

[0037] Furthermore, among the plurality of single-mode optical fibers, only one single-mode optical fiber is used to transmit the coupling signal, and the remaining single-mode optical fibers are used to transmit the communication signal.

[0038] Furthermore, the first coupler is a fan-out coupler (Fan Out coupler).

[0039] Furthermore, the second coupler is a wavelength division multiplexing coupler (WDM coupler).

[0040] Furthermore, the third coupler is a fan-in coupler (Fan In coupler).

[0041] Furthermore, the sensor module includes a temperature sensor, a strain sensor, and an acceleration sensor. The temperature sensor is used to monitor the deep sea temperature, the strain sensor is used to monitor the structural deformation of the optical repeater caused by deep sea waves, and the acceleration sensor is used to monitor the acceleration of deep sea waves. The signals monitored by the temperature sensor, the strain sensor, and the acceleration sensor are the perception signals.

[0042] It is worth mentioning that the submarine cable communication capacity of this embodiment has significant advantages. Specifically, the communication capacity of the multi-core optical fiber at the output end of the third coupler (i.e., the fan-in coupler) is:

[0043] ;

[0044] in, represents the communication capacity of the multi-core fiber at the output end of the fan-in coupler, It indicates the number of spatial channels when the single-mode optical fiber used to transmit communication signals and the single-mode optical fiber used to transmit coupled signals are space-division multiplexed. Indicates the number of wavelength divisions in each spatial channel when the wavelength division multiplexing coupler performs wavelength division multiplexing. Indicates the signal-to-noise ratio of a multi-core optical fiber.

[0045] It is not difficult to find that this embodiment can increase the communication capacity times, when When it is larger, the value can approach .

[0046] This embodiment provides a total length of 7000km, a single span of 50km, 140 optical repeater structures, and the optical repeater structure uses a four-core optical fiber. The following is a principle description of the perception and communication fusion process of the optical repeater structure:

[0047] Step 1: After the four-core optical fiber is transmitted over a single span of 50 km, it reaches the optical repeater structure of this embodiment, and the four-core optical fiber is connected to four single-mode optical fibers through a fan-out coupler. The output of the fan-out coupler is four single-mode optical fibers.

[0048] Step 2: Three of the four single-mode optical fibers are used for the transmission of communication signals and pass through three single-mode optical fiber amplifiers to compensate for the power loss of the single-span transmission of the communication signals. The other single-mode optical fiber is used for the co-transmission of the sensing signal and the communication signal.

[0049] Step 3: The sensor module in the optical repeater structure acquires sensing signals such as temperature and strain, and modulates them onto a digital subcarrier with an interval of 0-100 MHz through a coherent modulation scheme (each sensor is assigned a digital subcarrier of a different frequency), and couples the sensing signal of the optical repeater structure with the sensing signal of the preceding optical repeater structure (i.e., the previous relay node) through a wavelength division multiplexing coupler (the coupling signal here also includes the communication signal), and connects to a single-mode optical fiber.

[0050] Step 4: The four single-mode optical fibers are connected to the four-core optical fiber through a fan-in coupler for transmission in the next span and reach the next optical repeater structure. This cycle repeats until the communication signal and the sensing signal are transmitted to the data center on the shore. Embodiment 2

[0051] This embodiment relates to a deep-sea submarine cable system, including several optical repeater structures for deep-sea synaesthesia fusion as described in the first embodiment.

[0052] It is worth noting that in order to further optimize the deep-sea cable system, the second coupler (i.e., wavelength division multiplexing coupler) can usually deploy a certain number of second optical fiber amplifiers to compensate for the power loss caused by the transmission of the coupled signal (mainly the sensing signal) to the data center on the shore. The traditional method is to set a fixed number of second optical fiber amplifiers in the wavelength division multiplexing coupler, which will lead to increased costs and bring a certain burden to the deep-sea cable system.

[0053] Therefore, this embodiment is for The optical repeater structure for deep-sea synaesthesia fusion is provided, the second coupler (i.e., wavelength division multiplexing coupler) is provided with a preset number of second single-mode fiber amplifiers, the second single-mode fiber amplifiers are used to compensate for the power loss of the coupling signal, and the number of the second single-mode fiber amplifiers is:

[0054] ;

[0055] in, is the number of the second single-mode fiber amplifier, is the loss of a single span of submarine cable, is the gain of a single second single-mode fiber amplifier, is the total length of the deep-sea cable, is the single span length between adjacent optical repeater structures, To represent the minimum value.

[0056] It is not difficult to find that the number of second single-mode optical fiber amplifiers built into the wavelength division multiplexing coupler in this embodiment is variable, which effectively saves resources.

[0057] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0058] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. An optical repeater structure for deep-sea synaesthesia fusion, characterized by: The device comprises a first coupler, a second coupler, a third coupler, a coherent light modulation module and a sensor module, wherein: The first coupler is connected to a plurality of single-mode optical fibers, the plurality of single-mode optical fibers include a single-mode optical fiber for transmitting a communication signal and a single-mode optical fiber for transmitting a coupled signal, the coupled signal includes a communication signal and a modulated sensing signal, the single-mode optical fiber for transmitting the communication signal is connected to an input end of the third coupler, the single-mode optical fiber for transmitting the coupled signal is connected to an input end of the second coupler, the sensor module is connected to the input end of the second coupler through the coherent light modulation module, the output end of the second coupler is connected to the input end of the third coupler, and the output end of the third coupler is connected to a multi-core optical fiber; The sensor module is used to obtain perception signals about the deep sea; the coherent light modulation module is used to perform coherent light modulation on the perception signals obtained by the sensor module to obtain modulated perception signals; the second coupler is used to couple communication signals of different wavelengths with the modulated perception signals to obtain the coupled signals; the output end of the third coupler transmits the communication signals and the coupled signals to the outside through a multi-core optical fiber; The coherent optical modulation module modulates the sensing signal onto a digital subcarrier at a preset interval by a coherent optical modulation method, wherein the preset interval ranges from 0 to 100 MHz; The first coupler is a fan-out coupler; The second coupler is a wavelength division multiplexing coupler; The third coupler is a fan-in coupler.

2. The optical repeater structure for deep-sea synaesthesia fusion according to claim 1 is characterized by: The single-mode optical fiber used to transmit the communication signal is also connected to a first single-mode optical fiber amplifier, and the first single-mode optical fiber amplifier is used to compensate for the power loss of the communication signal.

3. The optical repeater structure for deep-sea synaesthesia fusion according to claim 1 is characterized by: The number of cores of the multi-core optical fiber is consistent with the number of the single-mode optical fiber.

4. The optical repeater structure for deep-sea synaesthesia fusion according to claim 1 is characterized by: Among the plurality of single-mode optical fibers, only one single-mode optical fiber is used to transmit coupling signals, and the remaining single-mode optical fibers are used to transmit communication signals.

5. The optical repeater structure for deep-sea synaesthesia fusion according to claim 1 is characterized by: The sensor module includes a temperature sensor, a strain sensor, and an acceleration sensor. The temperature sensor is used to monitor the deep sea temperature, the strain sensor is used to monitor the structural deformation of the optical repeater caused by deep sea waves, and the acceleration sensor is used to monitor the acceleration of deep sea waves. The signals monitored by the temperature sensor, the strain sensor, and the acceleration sensor are the perception signals.

6. The optical repeater structure for deep-sea synaesthesia fusion according to claim 1 is characterized by: The communication capacity of the multi-core optical fiber at the output end of the third coupler is: ； in, represents the communication capacity of the multi-core optical fiber at the output end of the third coupler, It indicates the number of spatial channels when the single-mode optical fiber used to transmit communication signals and the single-mode optical fiber used to transmit coupled signals are space-division multiplexed. Indicates the number of wavelength divisions in each spatial channel when the second coupler performs wavelength division multiplexing, Indicates the signal-to-noise ratio of a multi-core optical fiber.

7. A deep sea cable system, characterized in that: It comprises several optical repeater structures for deep-sea synaesthesia fusion as described in any one of claims 1-6.

8. The deep sea cable system according to claim 7, characterized in that: For The second coupler is provided with a preset number of second single-mode fiber amplifiers, and the second single-mode fiber amplifiers are used to compensate for the power loss of the coupled signal. The number of the second single-mode fiber amplifiers is: ； in, is the number of the second single-mode fiber amplifier, is the loss of a single span of submarine cable, is the gain of a single second single-mode fiber amplifier, is the total length of the deep-sea cable, is the single span length between adjacent optical repeater structures, To represent the minimum value.

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