Deep sea optical cable dry-wet transition terminal joint

Abstract

The utility model discloses a submarine communication equipment technology, and aims to provide a deep-sea optical cable dry-wet transition terminal joint, which is characterized by comprising a deep-sea optical cable input end sealing module used for sealing a deep-sea optical cable access dry cabin position; the dry cabin is used for bearing external seawater pressure; the wet cabin is used for balancing pressure; the multi-core optical fiber pressure-resistant cabin penetrating piece is used for connecting the dry cabin and the wet cabin; the optical fiber output interface module is located at the wet cabin terminal and used for being connected with the wet plugging optical fiber connector assembly in a matched mode through an oil pipe; the pipe clamp is used for fixing the whole terminal and is connected with the equipment cabin mounting panel; the product has oil filling and pressure compensation functions, can adapt to working conditions of more than 3000 meters underwater, and has high flexibility and applicability by customizing the quantity of optical cable input, hoses and wet-plugging optical fiber connector assembly output according to user requirements; the utility model is suitable for the technical field of submarine communication equipment.

Description

Technical Field

[0001] The utility model relates to a submarine communication equipment technology, and more specifically, to a deep-sea optical cable wet-dry transition terminal joint. Background Technique

[0002] With the development of marine resources and the in-depth research of marine science, the demand for submarine communication equipment is increasing day by day. As an important submarine communication medium, the stability and reliability of umbilical cables are crucial for the entire communication system. However, existing deep-sea optical cable wet-dry transition terminal joints often cannot meet the requirements of oil filling and pressure compensation under deep-water working conditions, and lack flexibility and applicability. Therefore, there is an urgent need for a deep-sea optical cable wet-dry transition terminal joint that can adapt to working conditions above 3000 meters underwater and has high flexibility and applicability. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a deep-sea optical cable wet-dry transition terminal joint, which has functions of oil filling and pressure compensation, can adapt to working conditions above 3000 meters underwater, and can customize the number of optical cable inputs, oil pipes, and outputs of wet-pluggable optical fiber connector assemblies according to user needs, with high flexibility and applicability.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A deep-sea optical cable wet-dry transition terminal joint, comprising:

[0005] A deep-sea optical cable input end sealing module for sealing the position where the deep-sea optical cable accesses the dry cabin;

[0006] A dry cabin for withstanding the external seawater pressure;

[0007] A wet cabin for pressure balance;

[0008] A multi-core optical fiber pressure-resistant through-cabin component for connecting the dry cabin and the wet cabin;

[0009] An optical fiber output interface module located at the end of the wet cabin and used for mating with a wet-pluggable optical fiber connector assembly through an oil pipe;

[0010] A pipe clamp for fixing the whole terminal and connecting with the installation panel of the equipment cabin;

[0011] The ratio between the length of the wet cabin and the depth of the optical fiber output interface module is 11 - 12.

[0012] The present utility model is further configured as follows: A dry cabin fixing pressing plate is provided at the connection between the deep-sea optical cable input end sealing module and the dry cabin. Two sealing structures are respectively provided inside the deep-sea optical cable input end sealing module for blocking seawater from entering the terminal along the outer sheath or inner sheath of the optical cable. A leak detection port for inspecting the installation quality of the sealing structure is provided on the outer shell of the deep-sea optical cable input end sealing module, and a standard plug for closing the leak detection port after leak detection is provided inside the leak detection port.

[0013] The present utility model is further configured as follows: Two O-ring seals are provided at both ends of the dry cabin for sealing with mating parts, and a leak detection port for inspecting the installation quality of the O-ring seals is provided on the outer shell of the dry cabin, and a standard plug for closing the leak detection port after leak detection is provided inside the leak detection port.

[0014] The present utility model is further configured as follows: A dry cabin fiber coiling box fixing bracket is provided inside the dry cabin, and a dry cabin fiber coiling box for fusing the optical fibers inside the deep-sea optical cable with the optical fibers led out by the multi-core optical fiber through-cabin part and providing sufficient space for coiling the surplus-length optical fibers is provided on the dry cabin fiber coiling box fixing bracket.

[0015] The present utility model is further configured as follows: The wet cabin is an oil-filled pressure balance cabin, and the oil pipe led out from its terminal acts as a pressure compensator, and the wet cabin is filled with oil and connected through a wet-pluggable optical fiber connector assembly.

[0016] The present utility model is further configured as follows: The pressure inside the wet cabin can be automatically adjusted according to the external environmental pressure. A wet cabin fiber coiling box fixing bracket is provided inside the wet cabin, and a wet cabin fiber coiling box for fusing the optical fibers inside the tail oil pipe with the optical fibers led out by the multi-core optical fiber through-cabin part and providing sufficient space for coiling the surplus-length optical fibers is provided on the wet cabin fiber coiling box fixing bracket.

[0017] The present utility model is further configured as follows: The multi-core optical fiber pressure-resistant through-cabin part includes a dry-wet cabin partition plate for separating the dry cabin and the wet cabin and a multi-core optical fiber through-cabin part installed on the dry-wet cabin partition plate and fixed by a through-cabin part fixing plate; the multi-core optical fiber pressure-resistant through-cabin part bears the axial pressure pointing from the wet cabin to the dry cabin, and meets the pressure resistance and sealing requirements between the partition plate part of the multi-core optical fiber pressure-resistant through-cabin part, the optical fiber and the shell of the multi-core optical fiber pressure-resistant through-cabin part.

[0018] The present utility model is further configured as follows: The optical fiber output interface module adopts a standard interface matching the oil pipe, and the wet cabin, the optical fiber output interface module, the oil pipe and the wet-pluggable optical fiber connector assembly form a pressure compensation unit to ensure the normal operation under deep-sea working conditions.

[0019] The present utility model is further configured as follows: There are two groups of pipe clamps for clamping and fixing the whole terminal and installing it on the installation panel of the equipment cabin, and the upper and lower half structures are used to clamp and install it by means of screw fastening.

[0020] The beneficial effects of the present utility model are:

[0021] 1. Compared with the prior art, the deep - sea optical cable dry - wet transition terminal joint of the present utility model adopts advanced sealing technology and pressure compensation design, significantly improving the stability of the optical cable in the deep - sea environment. It can adapt to extreme pressure and temperature conditions, ensuring stable operation under deep - sea working conditions. First of all, the double - seal structure of the input - end sealing module can effectively block the infiltration of seawater along the outer sheath or inner sheath of the optical cable, thus ensuring the safety of the internal optical fibers. In addition, the design of the multi - core optical fiber pressure - resistant through - cabin component between the dry cabin and the wet cabin not only effectively separates the dry cabin and the wet cabin, but also can withstand the axial pressure from the wet cabin, ensuring the firmness and tightness of the connection. This technical advantage enables the terminal joint to have good compressive resistance and durability in the complex deep - sea environment, be able to cope with the erosion of high pressure and corrosive seawater, and greatly improve the service life and stability of the deep - sea optical cable.

[0022] 2. The design of the deep - sea optical cable dry - wet transition terminal joint of the present utility model fully considers the working performance in the extreme deep - sea environment. The oil - filled pressure - balancing function of the wet cabin can automatically adjust the cabin pressure according to the pressure change of the external environment, avoiding structural damage and the decline of optical fiber performance caused by drastic changes in external pressure. At the same time, the optical fiber output interface module adopts a standardized interface design, ensuring compatibility with the wet - pluggable optical fiber connector assembly, making the connection and maintenance work more efficient and convenient, and ensuring the reliability of the connection and the stability of the signal. The realization of this series of performance optimizations not only improves the overall operation efficiency of the deep - sea optical cable system, but also reduces the maintenance cost and difficulty, providing more reliable technical support for deep - sea communication.

[0023] 3. In the present utility model, it has significant advantages in terms of durability and reliability, especially for the special requirements of the deep - sea environment. The sealing design of the dry cabin and the wet cabin, combined with the use of O - ring seals, can effectively prevent the penetration of seawater and extend the service life of the equipment. In addition, all connecting components are carefully designed and subjected to strict leak - detection tests to ensure the tightness and pressure - resistance performance of the system after installation. This design concept effectively reduces the probability of failures caused by environmental factors during long - term use of the equipment and improves the reliability of the overall system. The durability of the deep - sea optical cable dry - wet transition terminal joint can not only adapt to the long - term deep - sea operation environment, but also reduce the cost investment due to frequent maintenance.

[0024] 4. The present utility model also makes targeted designs in terms of maintenance convenience; first of all, the standardized design of each component of the system enables quick replacement of damaged components during maintenance, reducing the downtime. In addition, the setting of the leak detection port enables the integrity of the sealing structure to be checked at any time during use, so as to timely discover potential problems and avoid serious consequences caused by small problems. The upper and lower half structures of the pipe clamp are also convenient for quick installation and disassembly, improving the efficiency of maintenance work. By simplifying the maintenance process, the present utility model not only reduces the work intensity of operators, but also improves the overall availability of the equipment, making the maintenance and management of deep-sea optical cables more efficient; the structure is simple and reasonable, easy to manufacture, easy to operate, avoiding the defects in the prior art, and suitable for popularization and implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the front view structure diagram of the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0026] Figure 2 is the right view structure diagram of the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0027] Figure 3 is the structure diagram of the deep-sea optical cable input end sealing module in the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0028] Figure 4 is the structure diagram of the dry cabin in the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0029] Figure 5 is the structure diagram of the wet cabin in the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0030] Figure 6 is the structure diagram of the multi-core optical fiber pressure-resistant through-cabin component in the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0031] Figures 1-6 Reference numerals: 1, deep-sea optical cable input end sealing module; 2, dry cabin; 3, wet cabin; 4, multi-core optical fiber pressure-resistant through-cabin component; 5, optical fiber output interface module; 6, pipe clamp; 7, dry cabin fixing pressing plate; 8, sealing structure; 9, standard plug; 10, dry cabin fiber coiling box fixing bracket; 11, dry cabin fiber coiling box; 12, wet cabin fiber coiling box fixing bracket; 13, dry-wet cabin partition board; 14, through-cabin component fixing plate; 15, multi-core optical fiber through-cabin component; 16, optical cable tail buffer sleeve; 17, optical cable inner sheath seal; 18, wet cabin fiber coiling box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Refer to Figures 1-6 for further description of the embodiments of the dry-wet transition terminal joint of the deep-sea optical cable of the present utility model.

[0033] For ease of explanation, in the embodiments, spatial relative terms such as "upper", "lower", "left", "right", etc. are used to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" the other elements or features. Therefore, the exemplary term "lower" can include both the upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly.

[0034] Moreover, relative relationship terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0035] Figures 1 to 6 A deep-sea optical cable dry-wet transition terminal joint shown includes:

[0036] A sealing module 1 for the input end of the deep-sea optical cable, used for sealing the position where the deep-sea optical cable accesses the dry cabin 2;

[0037] The dry cabin 2, used to withstand the external seawater pressure;

[0038] The wet cabin 3, used for pressure balance;

[0039] A multi-core optical fiber pressure-resistant through-cabin component 4, used to connect the dry cabin 2 and the wet cabin 3;

[0040] An optical fiber output interface module 5, located at the terminal of the wet cabin 3 and used for mating with the wet-pluggable optical fiber connector assembly through an oil pipe;

[0041] A pipe clamp 6, used to fix the whole terminal and connect with the installation panel of the equipment cabin;

[0042] Among them, the multi-core optical fiber pressure-resistant through-cabin component 4 can meet the through-cabin sealing of no more than 16-core optical fibers, can resist the large pressure difference between the wet cabin 3 and the dry cabin 2, meet the requirements of deep-sea applications, and has the characteristics of miniaturization and high reliability.

[0043] The ratio between the length of the wet cabin 3 and the depth of the optical fiber output interface module 5 is 11 - 12, which is beneficial for better connection. When the ratio is less than 11, the depth of the optical fiber output interface module 5 is too deep. Although it is more beneficial for connection, the space of the wet cabin 3 is greatly reduced, affecting the use effect; when the ratio is greater than 12, the depth of the optical fiber output interface module 5 is too shallow. Although the space of the wet cabin 3 increases, it is not conducive to connection. Therefore, the preferred ratio is 11 - 12, which can neither affect the use effect of the wet cabin 3 nor facilitate the connection of the optical fiber output interface module 5.

[0044] At the connection between the deep - sea optical cable input - end sealing module 1 and the dry cabin 2, there is a dry - cabin fixing pressing plate 7. Inside the deep - sea optical cable input - end sealing module 1, there are two sealing structures 8 for blocking seawater from entering the terminal along the outer sheath or inner sheath of the optical cable. On the outer shell of the deep - sea optical cable input - end sealing module 1, there is a leak - detection port for inspecting the installation quality of the sealing structure 8, and inside the leak - detection port, there is a standard plug 9 for closing the leak - detection port after leak detection; The deep - sea optical cable input - end sealing module 1 is a structure for sealing the incoming cable. It also includes an optical - cable tail buffer sleeve 16 arranged at the tail for buffering and sealing, and also includes an optical - cable inner - sheath seal 17 for further preventing seawater from seeping into the terminal. This part can select different structural forms according to different input umbilical cables.

[0045] At both ends of the dry cabin 2, there are two O - ring seals for sealing with mating parts, and on the outer shell of the dry cabin 2, there is a leak - detection port for inspecting the installation quality of the O - ring seals, and inside the leak - detection port, there is a standard plug 9 for closing the leak - detection port after leak detection; Inside the dry cabin 2, there is a dry - cabin fiber - winding box fixing rack 10. On the dry - cabin fiber - winding box fixing rack 10, there is a dry - cabin fiber - winding box 11 for fusing the optical fibers inside the deep - sea optical cable with the optical fibers led out by the multi - core optical - fiber through - cabin part 15 and providing enough space to wind the surplus - length optical fibers; The dry cabin 2 is a sealed and pressure - resistant cabin structure, with air inside. The optical fibers inside the optical cable and the optical fibers led out from the dry end of the multi - core optical - fiber through - cabin part 15 are fused here.

[0046] The wet cabin 3 is an oil - filled pressure - balancing cabin. The oil pipe led out from its terminal acts as a pressure compensator, and it is filled with oil and connected to the wet cabin 3 through a wet - pluggable fiber - optic connector assembly; The pressure inside the wet cabin 3 can be automatically adjusted according to the external environmental pressure. Inside the wet cabin 3, there is a wet - cabin fiber - winding box fixing rack 12. On the wet - cabin fiber - winding box fixing rack 12, there is a wet - cabin fiber - winding box 18 for fusing the optical fibers inside the tail oil pipe with the optical fibers led out by the multi - core optical - fiber through - cabin part 15 and providing enough space to wind the surplus - length optical fibers; The optical fibers led out from the wet end of the multi - core optical - fiber through - cabin part 15 and the optical fibers inside the output oil pipe are fused here.

[0047] The multi - core optical - fiber pressure - resistant through - cabin part 4 includes a dry - wet cabin partition plate 13 that separates the dry cabin 2 and the wet cabin 3 and a multi - core optical - fiber through - cabin part 15 installed on the dry - wet cabin partition plate 13 and fixed by a through - cabin part fixing plate 14; The multi - core optical - fiber pressure - resistant through - cabin part 4 bears the axial pressure pointing from the wet cabin 3 to the dry cabin 2, meets the pressure - resistant and sealing requirements between the partition plate part of the multi - core optical - fiber pressure - resistant through - cabin part 4, the optical fiber, and the shell of the multi - core optical - fiber pressure - resistant through - cabin part 4, and realizes the connection of the optical fibers of the input - end optical cable and the optical fibers of the oil - pipe output.

[0048] The fiber optic output interface module 5 adopts a standard interface matching the oil pipe. The wet cabin 3, the fiber optic output interface module 5, the oil pipe, and the wet-mateable fiber optic connector assembly form a pressure compensation unit to ensure normal operation under deep-sea conditions. The fiber optic output interface module 5 can be configured with up to 4 standard interfaces.

[0049] There are two groups of pipe clamps 6, which are used to hold and fix the whole terminal and install it on the installation panel of the equipment cabin. The upper and lower half structures are used to clamp and install it by means of screw fastening.

[0050] In this utility model, all seals for the structure adopt O-rings, and the preferred specifications of this utility model are as follows: number of fiber cores: ≤16 cores; diameter of the mating umbilical cable: Φ7mm to Φ18mm; number of output oil pipes and wet-mateable fiber optic connector assemblies: ≤4; fiber insertion loss: ≤0.25dB (1310 / 1550 / 1625nm); working water depth: not less than 3000m; working temperature: -10°C to +50°C; design life: 25 years.

[0051] Compared with the prior art, the dry-wet transition terminal joint of the deep-sea optical cable of this utility model adopts advanced sealing technology and pressure compensation design, significantly improving the stability of the optical cable in the deep-sea environment, being able to adapt to extreme pressure and temperature conditions, and ensuring stable operation under deep-sea conditions. First of all, the double-sealing structure 8 of the input end sealing module can effectively block the infiltration of seawater along the outer sheath or inner sheath of the optical cable, thus ensuring the safety of the internal optical fibers. In addition, the design of the multi-core fiber pressure-resistant through-cabin component 4 between the dry cabin 2 and the wet cabin 3 not only effectively separates the dry and wet cabins, but also can withstand the axial pressure from the wet cabin 3, ensuring the firmness and tightness of the connection. This technical advantage enables the terminal joint to have good compressive resistance and durability in the complex deep-sea environment, be able to cope with the erosion of high pressure and corrosive seawater, and greatly improve the service life and stability of the deep-sea optical cable.

[0052] The design of the dry-wet transition terminal joint of the deep-sea optical cable of this utility model fully considers the working performance in the extreme deep-sea environment. The oil-filled pressure balance function of the wet cabin 3 can automatically adjust the pressure in the cabin according to the pressure change of the external environment, avoiding structural damage and degradation of optical fiber performance caused by drastic changes in external pressure. At the same time, the fiber optic output interface module 5 adopts a standardized interface design, ensuring compatibility with the wet-mateable fiber optic connector assembly, making the connection and maintenance work more efficient and convenient, ensuring the reliability of the connection and the stability of the signal. The realization of this series of performance optimizations not only improves the overall operation efficiency of the deep-sea optical cable system, but also reduces the maintenance cost and difficulty, providing more reliable technical support for deep-sea communication.

[0053] This utility model has significant advantages in terms of durability and reliability, especially for the special requirements of the deep-sea environment; the sealing design of the dry cabin 2 and the wet cabin 3, combined with the use of O-ring seals, can effectively prevent the penetration of seawater, extending the service life of the equipment. In addition, all connecting components are carefully designed and subjected to strict leak detection tests to ensure the sealing performance and pressure resistance of the system after installation. This design concept effectively reduces the probability of failures caused by environmental factors during long-term use of the equipment, improving the reliability of the overall system. The durability of the deep-sea optical cable dry-wet transition terminal joint can not only adapt to the long-term deep-sea operation environment but also reduce the cost investment due to frequent maintenance.

[0054] This utility model has also made targeted designs in terms of maintenance convenience; firstly, the standardized design of each component of the system enables the quick replacement of damaged components during maintenance, reducing the downtime. In addition, the setting of the leak detection port allows the integrity of the sealing structure 8 to be checked at any time during use, so as to promptly discover potential problems and avoid serious consequences caused by minor problems. The upper and lower half structures of the pipe clamp 6 are also convenient for quick installation and disassembly, improving the efficiency of maintenance work. By simplifying the maintenance process, this utility model not only reduces the work intensity of the operators but also improves the overall usability of the equipment, making the maintenance and management of deep-sea optical cables more efficient; with reasonable structure, easy manufacturing, simple operation, avoiding the defects in the prior art, it can meet the needs of long-term, stable, and reliable communication in the deep sea and is suitable for popularization and implementation.

[0055] The operation method of this utility model is as follows:

[0056] Install the sealing module 1 at the input end of the deep-sea optical cable to the position of the dry cabin 2. Then, fix the dry cabin 2 on the equipment cabin. Then, install the wet cabin 3 on the other side of the dry cabin 2. Next, install the multi-core optical fiber pressure-resistant through-cabin component 4 between the dry cabin 2 and the wet cabin 3. Subsequently, connect the optical fiber output interface module 5 to the terminal of the wet cabin 3. Then, complete the optical fiber fusion operation to ensure that all optical fiber connections are correct. Then, use the pipe clamp 6 to fix the entire terminal joint on the installation panel of the equipment cabin to ensure a firm installation. Adopt the upper and lower half structure and clamp it by means of screw fastening.

[0057] The above are only the preferred embodiments of this utility model and are not intended to limit this utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of this utility model should be included in the protection scope of this utility model.

Claims

1. A wet-dry transition terminal joint for a deep-sea optical cable, Comprising, characterized in that it comprises: A deep - sea optical cable input - end sealing module (1) for sealing the position where the deep - sea optical cable accesses the dry cabin (2); A dry cabin (2) for withstanding the external seawater pressure; A wet cabin (3) for pressure balancing; A multi - core optical fiber pressure - resistant through - cabin component (4) for connecting the dry cabin (2) and the wet cabin (3); An optical fiber output interface module (5) located at the terminal of the wet cabin (3) and used for mating with a wet - pluggable optical fiber connector assembly through an oil pipe; A pipe clamp (6) for fixing the whole terminal and connecting with the installation panel of the equipment cabin; The ratio between the length of the wet cabin (3) and the depth of the optical fiber output interface module (5) is 11 - 12.

2. The wet-dry transition terminal joint of a deep-sea optical cable according to claim 1, characterized in that At the connection between the deep - sea optical cable input - end sealing module (1) and the dry cabin (2), there is a dry - cabin fixing pressure plate (7). Inside the deep - sea optical cable input - end sealing module (1), there are two sealing structures (8) for preventing seawater from entering the terminal along the outer sheath or inner sheath of the optical cable. On the outer shell of the deep - sea optical cable input - end sealing module (1), there is a leak - detection port for inspecting the installation quality of the sealing structure (8), and inside the leak - detection port, there is a standard plug (9) for closing the leak - detection port after leak detection.

3. The wet-dry transition terminal joint of a deep-sea optical cable according to claim 1 or 2, characterized in that, At both ends of the dry cabin (2), there are two O - ring seals for sealing with mating parts, and on the outer shell of the dry cabin (2), there is a leak - detection port for inspecting the installation quality of the O - ring seal, and inside the leak - detection port, there is a standard plug (9) for closing the leak - detection port after leak detection.

4. The wet-dry transition terminal joint of a deep-sea optical cable according to claim 3, characterized in that Inside the dry cabin (2), there is a dry - cabin fiber - coiling box fixing frame (10). On the dry - cabin fiber - coiling box fixing frame (10), there is a dry - cabin fiber - coiling box (11) for splicing the optical fibers inside the deep - sea optical cable with the optical fibers led out by the multi - core optical fiber through - cabin component (15) and providing enough space for coiling the surplus - length optical fibers.

5. The wet-dry transition terminal joint of a deep-sea optical cable according to claim 1, characterized in that, The wet cabin (3) is an oil - filled pressure - balancing cabin, and the oil pipe led out from its terminal acts as a pressure compensator, and is filled with oil and connected to the wet cabin (3) through the wet - pluggable optical fiber connector assembly.

6. The wet-dry transition terminal joint of a deep-sea optical cable according to claim 5, characterized in that The pressure inside the wet cabin (3) can be automatically adjusted according to the external environmental pressure. Inside the wet cabin (3), there is a wet - cabin fiber - coiling box fixing frame (12). On the wet - cabin fiber - coiling box fixing frame (12), there is a wet - cabin fiber - coiling box (18) for splicing the optical fibers inside the tail oil pipe with the optical fibers led out by the multi - core optical fiber through - cabin component (15) and providing enough space for coiling the surplus - length optical fibers.

7. A wet-dry transition terminal joint of a deep-sea optical cable according to claim 1, characterized in that, The multi - core optical fiber pressure - resistant through - cabin component (4) includes a dry - wet cabin partition board (13) separating the dry cabin (2) and the wet cabin (3) and a multi - core optical fiber through - cabin component (15) installed on the dry - wet cabin partition board (13) and fixed by a through - cabin component fixing plate (14); the multi - core optical fiber pressure - resistant through - cabin component (4) bears the axial pressure pointing from the wet cabin (3) to the dry cabin (2), meeting the pressure - resistant and sealing requirements between the partition board parts of the multi - core optical fiber pressure - resistant through - cabin component (4), the optical fibers and the shell of the multi - core optical fiber pressure - resistant through - cabin component (4).

8. A dry-wet transition terminal joint of a deep-sea optical cable according to claim 1, characterized in that, The optical fiber output interface module (5) adopts a standard interface matching the oil pipe, and the wet cabin (3), the optical fiber output interface module (5), the oil pipe and the wet - pluggable optical fiber connector assembly form a pressure - compensation unit to ensure normal operation under deep - sea conditions.

9. The wet-dry transition terminal joint of a deep-sea optical cable according to claim 1, wherein, There are two groups of the pipe clamps (6) in total, which are used to clamp and fix the whole terminal and install it on the installation panel of the equipment cabin. The upper and lower half structures are adopted to clamp and install by means of screw fastening.

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