Fusion splicing protection structure and method for multi-core optical cable inside linear array

Abstract

A multi-core optical cable fusion splicing protection structure and method within a linear array provided by the present invention. A central through hole is provided inside an outer cylinder, and a core shaft is accommodated in the central through hole. One side of the core shaft is a multi-core optical cable laying area, and the multi-core optical cable laying area includes a single groove. The other side of the core shaft is a multiplexed optical fiber laying area, and the multiplexed optical fiber laying area includes a plurality of optical fiber accommodation grooves. All the plurality of optical fiber accommodation grooves are communicated with the single groove. A single core of the multi-core optical cable is connected to a single optical fiber of the multiplexed optical fiber. A first cover plate is fixed to one end of the outer cylinder close to the multi-core optical cable laying area, and a second cover plate is fixed to one end of the outer cylinder close to the multiplexed optical fiber laying area. A first through hole for the multi-core optical cable to pass through is provided on the first cover plate, and a second through hole for the multiplexed optical fiber to pass through is provided on the second cover plate. The orderly protection and fixation of multiple fusion splicing points between the multi-core optical cable and the multiplexed optical fiber improve the mechanical strength of the fusion splicing points and reduce the risk of optical fiber damage, solving the problem of compatibility between the fusion splicing protection device and the linear array layout.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber fusion splicing protection in large-scale optical fiber sensing, and specifically, to a multi-core optical cable fusion splicing protection structure and method within a linear array. Background Art

[0002] The multiplexing technology of fiber optic hydrophones is the core of their large-scale array formation. According to different application scenarios, it mainly includes shore-based arrays in vast waters such as ports and island reefs, and towed linear arrays on mobile platforms.

[0003] However, while fiber optic linear arrays have the technical advantages of large-scale multiplexing, they also face the problem of a large increase in the number of fiber optic fusion splices in the array optical path, which poses many risks to the reliability of the array. Due to the limited space within the towed linear array sheath, the array has significant constraints on the number and size of the up and down transmission cables and fusion splices. At the same time, there are also strict limitations on the number of fusion splices, transmission cables, and Kevlar ropes that can be carried within a single array element module in a limited space. Secondly, fiber optic networks based on wavelength division and space division multiplexing technologies in linear arrays will introduce additional optical passive devices such as wavelength division multiplexers / demultiplexers and multiple transmission optical cables respectively, posing new problems to traditional fusion splicing solutions.

[0004] Patent CN 201218851Y describes a fiber optic fusion splice fixing device, which is a hollow box-shaped structure mainly composed of a metal box body, a metal box cover, and a clamping member; through holes for the fiber optic to pass through are opened in the middle of both sides of the metal box body; a clamping member for clamping the fiber optic is also embedded in the through holes; the metal box cover is fixedly connected to the metal box body. The entire device uses the heat conduction performance of the metal to conduct the heat generated by the fiber optic fusion splice, preventing the fiber optic polymer coating from melting and burning due to heat; and suspending the fiber optic fusion splice and the bare fiber optic so that they do not contact any object that may cause power leakage. However, such a housing occupies a large space and is not treated against oil, making it not suitable for the fusion splicing protection of multi-core optical cables in linear arrays and oil environments.

[0005] The following improvements are needed in the prior art:

[0006] (1) It is impossible to meet the requirement that the up and down optical cables use multi-core optical cables as carriers to increase the safety of the cables and the simplicity of the optical path in the linear array;

[0007] (2) It is necessary to focus on protecting the optical fibers and fusion splices of the multi-core optical cable under wavelength division and space division multiplexing to improve the reliability of the fiber optic hydrophone multiplexing array;

[0008] (3) The fixing method of fiber optic fusion splices is relatively complex;

[0009] (4) The fiber optic fusion joint fixing device occupies a large space and is not oil-proof, so it is not suitable for the fusion protection of multi-core optical cables in a linear array and oil environments. Summary of the Invention

[0010] Aiming at the defects in the prior art, the purpose of the present invention is to provide a multi-core optical cable fusion protection structure and method within a linear array.

[0011] A multi-core optical cable fusion protection structure within a linear array provided by the present invention includes an outer cylinder, a core shaft, a first cover plate, and a second cover plate;

[0012] A central through hole is provided inside the outer cylinder, and the core shaft is accommodated in the central through hole;

[0013] One side of the core shaft is a multi-core optical cable laying area, the multi-core optical cable laying area includes a single groove, the other side of the core shaft is a multiplexed optical fiber laying area, the multiplexed optical fiber laying area includes a plurality of optical fiber accommodation grooves, and the plurality of optical fiber accommodation grooves are all communicated with the single groove. The single core of the multi-core optical cable is connected to a single optical fiber of the multiplexed optical fiber;

[0014] The first cover plate and the second cover plate are respectively detachably fixed at both ends of the outer cylinder. The first cover plate is fixed at one end of the outer cylinder close to the multi-core optical cable laying area, and the second cover plate is fixed at one end of the outer cylinder close to the multiplexed optical fiber laying area;

[0015] A first through hole for the multi-core optical cable to pass through is provided on the first cover plate, and a second through hole for the multiplexed optical fiber to pass through is provided on the second cover plate.

[0016] Preferably, a first through groove is provided on the outer wall of the outer cylinder, and a plurality of the first through grooves are evenly distributed on the circumferential side of the outer cylinder;

[0017] Second through grooves are provided at both ends of the outer cylinder, and any one of the second through grooves is wound around the central axis of the outer cylinder.

[0018] Preferably, a positioning pin is further included;

[0019] A first semi-circular pin through groove is provided on the inner wall of the central through hole, and the first semi-circular pin through groove is arranged along the axis direction of the outer cylinder;

[0020] A second semi-circular pin through groove is provided on the side wall of the core shaft, and the second semi-circular pin through groove is arranged along the axis direction of the core shaft;

[0021] The first semi-circular pin through groove and the second semi-circular pin through groove cooperate to form a receiving groove, the positioning pin is arranged in the receiving groove, and the positioning pin and the receiving groove are in interference fit.

[0022] Preferably, the mounting surface of the core shaft that cooperates with the central through hole is a curved surface, and the mounting clearance between the mounting surface and the inner wall of the central through hole is no more than 0.1 mm.

[0023] Preferably, the plurality of optical fiber accommodating grooves are parallel double grooves, and the parallel double grooves are connected with the single groove to form a Y-shaped through groove.

[0024] Preferably, a transition section is connected between the parallel double groove and the single groove, the axial length of the parallel double groove is not less than 60 mm, and the length of the transition section is not less than 10 mm.

[0025] Preferably, a fiber fusion splicing heat shrink sleeve is sleeved at the fusion joint between a single core of the multi-core optical cable and a single optical fiber of the multiplexed optical fiber, and the fiber fusion splicing heat shrink sleeve is arranged in a fiber accommodating groove, and the width or depth of the fiber accommodating groove is greater than the outer diameter of the fiber fusion splicing heat shrink sleeve, and the difference between the width of the fiber accommodating groove and the outer diameter of the fiber fusion splicing heat shrink sleeve is Δ≤0.5mm, and the difference between the depth of the fiber accommodating groove and the outer diameter of the fiber fusion splicing heat shrink sleeve is Δ≤0.5mm.

[0026] Preferably, the spacers between any adjacent optical fiber accommodating grooves are subjected to edge and corner passivation treatment.

[0027] Preferably, the first through hole is arranged in the middle of the first cover plate, and the second through hole is arranged in the middle of the second cover plate.

[0028] According to the present invention, a method for protecting the fusion splicing of multi-core optical cables in a linear array comprises the following steps:

[0029] S1: The multi-core optical cable to be fused passes through the first through hole, and the multiple multiplexed optical fibers to be fused pass through the multiple through holes of the second cover plate and the central through hole one by one;

[0030] S2: splice the multiple single cores of the multi-core optical cable with the multiplexed optical fibers one by one, place the multiplexed optical fibers one by one in the optical fiber receiving grooves, place the multi-core optical cable in the single groove, fill any single groove and any optical fiber receiving groove with two-component glue, and position the multiplexed optical fiber and the multi-core optical cable;

[0031] S3: After the glue is cured, the mandrel is placed in the central through hole and the positioning pin is placed in the receiving groove;

[0032] S4: The first cover plate and the second cover plate are respectively placed against two axial sides of the outer tube, and the first cover plate and the second cover plate are respectively fixed to two ends of the outer tube.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. By placing the fusion splice point between the stripped section of the multi-core optical cable and the multiplexed optical fiber within the optical fiber receiving groove on the mandrel, and fixing the overall fusion splice section of the stripped section of the multi-core optical cable and the multiplexed optical fiber within the outer cylinder, the technical problem of the optical fiber in the stripped section of the multi-core optical cable being easily bent by external forces is solved, which helps to protect multiple fusion splice points in an orderly manner and solves the technical problem of compatibility between the fusion splice protection device and the linear array layout. The fusion splice point between the stripped section of the multi-core optical cable and the multiplexed optical fiber can be conveniently fixed and stored, which helps to improve the mechanical strength of the fusion splice point and reduce the risk of optical fiber damage.

[0035] 2. By providing a first through groove and a second through groove on the outer wall of the outer cylinder, it helps in the layout of cables such as Kevlar ropes in the linear array, increasing the safety of the cables in the linear array and the simplicity of the optical path.

[0036] 3. By sleeving a fiber fusion heat shrinkable sleeve at the fusion joint of a single core of the multi-core optical cable and a single optical fiber of the multiplexed optical fiber, and covering and filling the single groove and the optical fiber receiving groove with glue, it helps to fix the multi-core optical cable and the multiplexed optical fiber. The fixing method is simple, and it realizes oil separation and rigid protection for the heat shrinkable sleeve section.

[0037] 4. By positioning the mandrel in the central through hole of the outer cylinder through a positioning pin, it helps in the accurate positioning during the installation of the mandrel, improving the installation speed and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, purposes, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0039] Figure 1 is an exploded view mainly showing the fusion splice protection structure of the multi-core optical cable within the linear array of the present invention;

[0040] Figure 2 is a schematic structural view mainly showing the outer cylinder of the present invention;

[0041] Figure 3 is a schematic structural view mainly showing the mandrel of the present invention;

[0042] Figure 4 is a schematic structural view mainly showing the first cover plate and the second cover plate of the present invention;

[0043] Figure 5 is an exploded view mainly showing the multi-purpose optical cable and the multiplexed optical fiber accommodated in the protection structure of the present invention.

[0044] As shown in the figure:

[0045] Outer cylinder 1, Central through hole 10

[0046] Mandrel 2, First through groove 11

[0047] The first cover plate 3, the second through groove 12

[0048] The second cover plate 4, the first semi-circular pin through groove 13

[0049] The positioning pin 5, the second semi-circular pin through groove 14

[0050] The single groove 6, the multi-core optical cable 15

[0051] The optical fiber accommodation groove 7, the multiplexed optical fiber 16

[0052] The first through hole 8, the fusion joint 17

[0053] The second through hole 9 Specific embodiments

[0054] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0055] As Figure 1 shown, a multi-core optical cable fusion splicing protection structure within a linear array according to the present invention includes an outer cylinder 1, a core shaft 2, a first cover plate 3, and a second cover plate 4. A central through hole 10 is provided inside the outer cylinder 1, and the core shaft 2 is accommodated in the central through hole 10. One side of the core shaft 2 is a layout area for the multi-core optical cable 15, and the layout area for the multi-core optical cable 15 includes a single groove 6. The other side of the core shaft 2 is a layout area for the multiplexed optical fiber 16, and the layout area for the multiplexed optical fiber 16 includes a plurality of optical fiber accommodation grooves 7. All the plurality of optical fiber accommodation grooves 7 communicate with the single groove 6, and a single core of the multi-core optical cable 15 is connected to a single optical fiber of the multiplexed optical fiber 16. The first cover plate 3 and the second cover plate 4 are respectively detachably fixed to both ends of the outer cylinder 1. The first cover plate 3 is fixed to one end of the outer cylinder 1 close to the layout area of the multi-core optical cable 15, and the second cover plate 4 is fixed to one end of the outer cylinder 1 close to the layout area of the multiplexed optical fiber 16. A first through hole 8 for threading the multi-core optical cable 15 is provided on the first cover plate 3, and a second through hole 9 for threading the multiplexed optical fiber 16 is provided on the second cover plate 4.

[0056] The present invention places the fusion joint 17 between the stripped section of the multi-core optical cable 15 and the multiplexed optical fiber 16 inside the optical fiber accommodation groove 7 on the core shaft 2, and the fusion splicing section between the stripped section of the multi-core optical cable 15 and the multiplexed optical fiber 16 is integrally fixed inside the outer cylinder 1, solving the technical problem that the optical fiber of the stripped section of the multi-core optical cable 15 is easily bent by external forces, realizing the orderly protection of multiple fusion joints 17, and solving the problem of compatibility between the fusion splicing protection device and the layout of the linear array. The fusion joint 17 between the stripped section of the multi-core optical cable 15 and the multiplexed optical fiber 16 can be conveniently fixed and stored, improving the mechanical strength of the fusion joint 17 and reducing the risk of optical fiber damage.

[0057] Specifically, as Figure 2 shown, the shape of the outer cylinder 1 is preferably cylindrical. A first through groove 11 is provided on the outer wall of the outer cylinder 1. A plurality of first through grooves 11 are evenly distributed on the circumferential side of the outer cylinder 1. Second through grooves 12 are provided at both ends of the outer cylinder 1. Any one of the second through grooves 12 surrounds the central axis of the outer cylinder 1. Both the first through groove 11 and the second through groove 12 are rectangular through grooves.

[0058] In order to reduce the damage of the optical fiber, the corners of the interlayer between any adjacent optical fiber receiving grooves 7 are subjected to blunt corner treatment.

[0059] Furthermore, a fiber optic fusion heat shrinkable sleeve is sleeved on the fusion joint of the single core of the multi-core optical cable 15 and the single optical fiber of the multiplexed optical fiber 16. The fiber optic fusion heat shrinkable sleeve is arranged in the optical fiber receiving groove 7. The width or depth of the optical fiber receiving groove 7 is greater than the outer diameter of the fiber optic fusion heat shrinkable sleeve. The difference Δ between the width of the optical fiber receiving groove 7 and the outer diameter of the fiber optic fusion heat shrinkable sleeve is ≤ 0.5 mm. The difference Δ between the depth of the optical fiber receiving groove 7 and the outer diameter of the fiber optic fusion heat shrinkable sleeve is ≤ 0.5 mm.

[0060] A feasible implementation method is: as Figure 3 shown, there are two optical fiber receiving grooves 7. The two optical fiber receiving grooves 7 form a side-by-side double groove. The side-by-side double groove communicates with the single groove 6 to form a Y-shaped through groove. One side of the area where the multi-core optical cable 15 is arranged is the single groove 6, and one side of the area where the multiplexed optical fiber 16 is arranged is the side-by-side double groove. The corners of the interlayer between the side-by-side double grooves are subjected to blunt corner treatment. A transition section is communicated between the side-by-side double groove and the single groove 6. The axial length of the side-by-side double groove is not less than 60 mm, and the length of the transition section is not less than 10 mm, which is used for splitting the optical fibers inside the multi-core optical cable 15.

[0061] The shape of the core shaft 2 is strip-shaped. Y-shaped through grooves are respectively formed on two opposite side surfaces of the core shaft 2. The width and depth of the Y-shaped through groove are both slightly greater than the outer diameter of the fiber optic fusion heat shrinkable sleeve, and the difference Δ is ≤ 0.5 mm. Glue is used to cover and fill any single groove 6 and any side-by-side double groove for fixing the multi-core optical cable 15 and the multiplexed optical fiber 16, as well as for oil separation and rigid protection of the heat shrinkable sleeve section.

[0062] Furthermore, as Figure 4 shown, the first cover plate 3 is the cover plate on the side of the core shaft 2 where the single groove 6 is provided. The first through hole 8 is arranged in the middle of the first cover plate 3. Preferably, two through holes are opened at the central position of the first cover plate 3, corresponding to the two single grooves 6 of the core shaft 2 respectively, for threading two groups of multi-core optical cables 15. The second cover plate 4 is the cover plate on the side of the core shaft 2 where the side-by-side double groove is provided. Preferably, four through holes are opened at the central position of the second cover plate 4, corresponding to the two groups of side-by-side double grooves of the core shaft 2 respectively, and for threading the multiplexed optical fiber 16.

[0063] Furthermore, screw holes are evenly distributed at both end faces of the outer cylinder 1. The outer surface layer structure of the first cover plate 3 is the same as that of the outer cylinder 1, and the first cover plate 3 is fixed on the outer cylinder 1 by the cooperation of screw holes and flat head screws. The outer surface layer structure of the second cover plate 4 is the same as that of the outer cylinder 1, and the second cover plate 4 is fixedly installed on the outer cylinder 1 by flat head screws. Rectangular through grooves are evenly distributed on the first cover plate 3 and the second cover plate 4, and the rectangular through grooves of the first cover plate 3 and the second cover plate 4 are all matched with the first through groove 11 of the outer cylinder 1.

[0064] A preferred embodiment is that the fusion splicing protection structure of the multi-core optical cable 15 in the linear array is further provided with positioning pins 5, and the positioning pins 5 are preferably two cylindrical rods. A central through hole 10 is provided in the outer cylinder 1, and a first semi-circular pin through groove 13 is provided on the inner wall of the central through hole 10. The first semi-circular pin through groove 13 is arranged along the axis direction of the outer cylinder 1, and the shape of the first semi-circular pin through groove 13 is preferably semi-cylindrical. A second semi-circular pin through groove 14 is provided on the side wall of the core shaft 2. The second semi-circular pin through groove 14 is arranged along the axis direction of the core shaft 2, and the shape of the second semi-circular pin through groove 14 is preferably semi-cylindrical. The first semi-circular pin through groove 13 and the second semi-circular pin through groove 14 cooperate to form a receiving groove, and the positioning pins 5 are arranged in the receiving groove, and the positioning pins 5 and the receiving groove are in interference fit to position the core shaft 2 in the central through hole 10 of the outer cylinder 1. The installation surface of the core shaft 2 cooperating with the central through hole 10 is an arc surface, the outer diameter of the core shaft 2 matches the size of the central through hole 10 of the outer cylinder 1, and the installation gap between the installation surface and the inner wall of the central through hole 10 is not greater than 0.1 mm.

[0065] As Figure 5 shown, a method for fusing and protecting a multi-core optical cable 15 in a linear array according to the present invention includes the following steps:

[0066] S1: The multi-core optical cable 15 to be fused passes through the first through hole 8, and the multiple multiplexed optical fibers 16 to be fused pass through the multiple through holes of the second cover plate 4 and through the central through hole 10 one by one. Specifically, the multi-core optical cable 15 to be fused passes through a through hole of the first cover plate 3, and the two multiplexed optical fibers 16 to be fused pass through two through holes of the second cover plate 4 respectively and through the central through hole 10 of the outer cylinder 1.

[0067] S2: The multiple single cores of the multi-core optical cable 15 are respectively fused with the multiple multiplexed optical fibers 16 one by one. The multiple multiplexed optical fibers 16 are placed in the optical fiber receiving grooves 7 one by one, and the multi-core optical cable 15 is placed in the single groove 6. Any single groove 6 and any optical fiber receiving groove 7 are filled with two-component glue to position the multiplexed optical fibers 16 and the multi-core optical cable 15. Specifically, after the multi-core optical cable 15 and the multiplexed optical fibers 16 are fused, the corresponding fusion joints 17 of the multiplexed optical fibers 16 are respectively placed in the corresponding core shafts 2, and the fusion joints 17 and the core shafts 2 are filled with two-component glue to position the multi-core optical cable 15 and the multiplexed optical fibers 16.

[0068] S3: After the glue is cured, place the mandrel 2 into the central through-hole 10, and place the positioning pins 5 into the receiving grooves. Specifically, after the glue is cured, place the mandrel 2 into the central through-hole 10 of the outer cylinder 1, and place the two positioning pins 5 into the circular receiving groove formed by the first semi-circular pin slot and the second semi-circular pin slot.

[0069] S4: Press the first cover plate 3 and the second cover plate 4 against both axial sides of the outer cylinder 1 respectively, and fix the first cover plate 3 and the second cover plate 4 at both ends of the outer cylinder 1 respectively. Specifically, press the first cover plate 3 and the second cover plate 4 against both axial sides of the outer cylinder 1 respectively, and pass the flat head screws through the screw through-holes of the cover plates and fix them at the corresponding screw holes of the outer cylinder 1. During this period, it is necessary to ensure that the multi-core optical cable 15 and the multiplexed optical fiber 16 in each through-hole are in a straight and free state.

[0070] Finally, the fusion joint 17 between the multi-core optical cable 15 and the multiplexed optical fiber 16 is protected inside the outer cylinder 1. The laying of cables such as the Kevlar ropes of the linear array can be implemented through the rectangular through-grooves on the surface of the outer cylinder 1, effectively accommodating and protecting the fusion joint 17 between the multi-core optical cable 15 and the multiplexed optical fiber 16 of the linear array.

[0071] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0072] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A multi-core optical cable fusion splicing protection structure inside a linear array, characterized in that, It includes an outer cylinder (1), a core shaft (2), a first cover plate (3) and a second cover plate (4); A central through hole (10) is arranged inside the outer cylinder (1), and the core shaft (2) is accommodated in the central through hole (10); One side of the core shaft (2) is the laying area of the multi-core optical cable (15), and the laying area of the multi-core optical cable (15) includes a single groove (6). The other side of the core shaft (2) is the laying area of the multiplexed optical fiber (16), and the laying area of the multiplexed optical fiber (16) includes a plurality of optical fiber accommodating grooves (7). A plurality of the optical fiber accommodating grooves (7) are all communicated with the single groove (6). A single core of the multi-core optical cable (15) is connected to a single optical fiber of the multiplexed optical fiber (16); The first cover plate (3) and the second cover plate (4) are respectively detachably fixed at both ends of the outer cylinder (1). The first cover plate (3) is fixed at one end of the outer cylinder (1) close to the laying area of the multi-core optical cable (15), and the second cover plate (4) is fixed at one end of the outer cylinder (1) close to the laying area of the multiplexed optical fiber (16); A first through hole (8) for the multi-core optical cable (15) to pass through is arranged on the first cover plate (3), and a second through hole (9) for the multiplexed optical fiber (16) to pass through is arranged on the second cover plate (4); A fiber fusion heat shrinkable sleeve is sleeved on the fusion joint of a single core of the multi-core optical cable (15) and a single optical fiber of the multiplexed optical fiber (16). The fiber fusion heat shrinkable sleeve is arranged in the optical fiber accommodating groove (7). The width or depth of the optical fiber accommodating groove (7) is greater than the outer diameter of the fiber fusion heat shrinkable sleeve. The difference Δ between the width of the optical fiber accommodating groove (7) and the outer diameter of the fiber fusion heat shrinkable sleeve is ≤ 0.5 mm, and the difference Δ between the depth of the optical fiber accommodating groove (7) and the outer diameter of the fiber fusion heat shrinkable sleeve is ≤ 0.5 mm.

2. The multi-core optical cable fusion splicing protection structure within the linear array according to claim 1, characterized in that, A first through groove (11) is arranged on the outer wall of the outer cylinder (1), and a plurality of the first through grooves (11) are evenly distributed on the circumferential side of the outer cylinder (1); Second through grooves (12) are arranged at both ends of the outer cylinder (1), and any one of the second through grooves (12) is wound around the central axis of the outer cylinder (1).

3. The multi-core optical cable fusion splicing protection structure within the linear array according to claim 1, characterized in that, It further includes a positioning pin (5); A first semi-circular pin through groove (13) is arranged on the inner wall of the central through hole (10), and the first semi-circular pin through groove (13) is arranged along the axial direction of the outer cylinder (1); A second semi-circular pin through groove (14) is arranged on the side wall of the core shaft (2), and the second semi-circular pin through groove (14) is arranged along the axial direction of the core shaft (2); The first semi-circular pin through groove (13) and the second semi-circular pin through groove (14) cooperate to form a receiving groove. The positioning pin (5) is arranged in the receiving groove, and the positioning pin (5) and the receiving groove are in interference fit.

4. The multi-core optical cable fusion splicing protection structure within the linear array according to claim 1, characterized in that, The installation surface of the core shaft (2) cooperating with the central through hole (10) is an arc surface, and the installation gap between the installation surface and the inner wall of the central through hole (10) is not greater than 0.1 mm.

5. The multi-core optical cable fusion splicing protection structure within the linear array according to claim 1, characterized in that, A plurality of the optical fiber accommodating grooves (7) are parallel double grooves, and the parallel double grooves are communicated with the single groove (6) to form a Y-shaped through groove.

6. The in-line array multi-core optical cable fusion splicing protection structure according to claim 5, characterized in that, A transition section is communicated between the parallel double grooves and the single groove (6). The axial length of the parallel double grooves is not less than 60 mm, and the length of the transition section is not less than 10 mm.

7. The multi-core optical cable fusion splicing protection structure within the linear array according to claim 1, characterized in that The interlayer between any adjacent optical fiber receiving grooves (7) is subjected to corner passivation treatment.

8. The multi-core optical cable fusion splicing protection structure within the linear array according to claim 1, characterized in that, The first through hole (8) is arranged in the middle of the first cover plate (3), and the second through hole (9) is arranged in the middle of the second cover plate (4).

9. A method for protecting the fusion splicing of a multi-core optical cable within a linear array, characterized in that, Using the in-line array multi-core optical cable fusion splicing protection structure according to any one of claims 1-8, the method includes the following steps: S1: The multi-core optical cable (15) to be spliced passes through the first through hole (8), and multiple multi-mode optical fibers (16) to be spliced pass through the multiple through holes of the second cover plate (4) one by one and pass through the central through hole (10); S2: The multiple single cores of the multi-core optical cable (15) are respectively fusion spliced with the multiple multi-mode optical fibers (16) one by one. The multiple multi-mode optical fibers (16) are respectively placed in the optical fiber receiving grooves (7), and the multi-core optical cable (15) is placed in the single groove (6). Any single groove (6) and any optical fiber receiving groove (7) are filled with a two-component glue to position the multi-mode optical fibers (16) and the multi-core optical cable (15); S3: After the glue is cured, the mandrel (2) is placed in the central through hole (10), and the positioning pin (5) is placed in the receiving groove; S4: The first cover plate (3) and the second cover plate (4) are respectively abutted against both axial sides of the outer cylinder (1), and the first cover plate (3) and the second cover plate (4) are respectively fixed at both ends of the outer cylinder (1).

Images