Optical ribbon cable with high lateral pressure resistance

Abstract

This utility model relates to the field of optical fiber communication technology and discloses a ribbon optical cable with high lateral pressure resistance, including several optical fibers and an outer sheath. The outer sheath has a square cross-section and a central cavity inside. Several optical fibers are located in the central cavity, and a central reinforcement is provided between every two adjacent optical fibers. The outer periphery of the several optical fibers is sequentially covered with an anisotropic plastic coating layer, an elastic filling layer, a water-blocking layer, and an armor layer. The gap between the armor layer and the central reinforcement in the central cavity is filled with a filling layer. Metal parts are provided at the four corners inside the outer sheath, and non-metallic yarn is covered on the outside of the metal parts. By combining the outer sheath with the central cavity, the space utilization rate is improved by more than 30%. The independent bundle tube design on both sides avoids optical fiber stacking and reduces micro-bending loss. The four corner optical fiber-non-metallic yarn stranded layer forms a three-dimensional stress dispersion network, which effectively improves the tensile strength and lateral pressure resistance of the optical cable.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber communication technology, and in particular to a ribbon optical cable with high resistance to lateral pressure. Background Technology

[0002] Traditional ribbon optical cables are a type of optical cable that uses a special process to arrange multiple optical fibers in parallel and solidify them into a flat ribbon structure. Compared with ordinary optical cables, ribbon optical cables have the characteristics of high-density integration, with a single cable accommodating hundreds to thousands of optical fibers. The fiber density can be up to four times that of ordinary loose tube optical cables. For example, a 12-core / ribbon design can significantly reduce the space occupied by the duct. However, traditional ribbon optical cables have significant problems, such as insufficient mechanical strength. The circular loose tube structure is susceptible to lateral pressure, leading to fiber micro-bending loss. Furthermore, the steel wire reinforcement is concentrated in the cable core, making it difficult to balance tensile strength and lateral pressure resistance. In addition, the circular cross-section causes fiber ribbon stacking, making it impossible to achieve high-density arrangement (e.g., the maximum number of cores in a conventional ribbon optical cable is 288), which is insufficient to meet the gigabit transmission requirements of the 5G era. Utility Model Content

[0003] The purpose of this invention is to provide a ribbon optical cable with high resistance to lateral pressure, in order to solve the problems mentioned in the background art, such as the circular loose tube structure being susceptible to lateral pressure leading to fiber micro-bending loss, and the steel wire reinforcement being concentrated in the cable core, making it difficult to balance tensile strength and lateral pressure resistance.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a ribbon optical cable with high lateral pressure resistance, comprising several optical fibers and an outer sheath. The outer sheath has a square cross-section and a central cavity inside. Several optical fibers are located in the central cavity, and a central reinforcing member is provided between every two adjacent optical fibers. The outer periphery of the several optical fibers is sequentially covered with an anisotropic plastic coating layer, an elastic filling layer, a water-blocking layer, and an armor layer. The gap between the armor layer and the central reinforcing member in the central cavity is filled with a filling layer. Metal parts are provided at the four corners inside the outer sheath, and the metal parts are covered with non-metallic yarn.

[0005] Preferably, the optical fiber is a single-mode or multimode optical fiber.

[0006] Preferably, the non-metallic yarn is aramid yarn.

[0007] Preferably, the metal part is a non-metallic high-modulus material that matches the thermal expansion coefficient of aramid yarn.

[0008] Preferably, the armor layer is an S-shaped interlocking steel strip.

[0009] Preferably, a polyethylene adhesive protective layer is provided between the armor layer and the water-blocking strip.

[0010] Preferably, the elastic filler layer is filled with silicone rubber microspheres.

[0011] Preferably, a thin thermoplastic elastomer membrane is added between the elastic filler layer and the water-blocking layer.

[0012] Preferably, the central reinforcement is made of FRP material.

[0013] Preferably, the outer sheath is made of a low-smoke, halogen-free material.

[0014] The beneficial effects of this utility model are:

[0015] This invention achieves a space utilization rate increase of over 30% by combining the outer sheath with the central cavity. The independent bundle tube design on both sides avoids fiber optic overlap and reduces micro-bending loss. The four-corner fiber-non-metallic yarn stranded layer forms a three-dimensional stress dispersion network, increasing tensile strength by 45% and lateral pressure resistance by 60% compared to traditional designs. Furthermore, this ribbon optical cable meets the requirements for submarine optical cable branch nodes because the armor layer and water-blocking layer form a double barrier, achieving a waterproof rating of IP68 and withstanding temperature differences from -40℃ to 70℃. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a ribbon optical cable with high lateral pressure resistance proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the outer layered structure of an optical fiber in a ribbon optical cable with high lateral pressure resistance, as proposed in this utility model.

[0018] Figure 3 This is an enlarged structural diagram of point A of a ribbon optical cable with high lateral pressure resistance proposed in this utility model.

[0019] In the diagram: 1. Non-metallic yarn; 2. Metallic component; 3. Armor layer; 4. Water-blocking layer; 5. Elastic filling layer; 6. Central reinforcement; 7. Irregular plastic coating layer; 8. Optical fiber; 9. Outer sheath; 10. Central cavity. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1-3A ribbon optical cable with high lateral pressure resistance includes several optical fibers 8 and an outer sheath 9. The outer sheath 9 has a square cross-section and a central cavity 10 inside. Several optical fibers 8 are located inside the central cavity 10. A central reinforcing member 6 is provided between every two adjacent optical fibers 8. The outer periphery of several optical fibers 8 is sequentially covered with an anisotropic plastic coating layer 7, an elastic filling layer 5, a water-blocking layer 4, and an armor layer 3. The gap between the armor layer 3 and the central reinforcing member 6 in the central cavity 10 is filled with a filling layer. Metal members 2 are provided at the four corners inside the outer sheath 9. The metal members 2 are covered with non-metallic yarn 1.

[0022] The composite reinforcement structure is formed by combining the metal components 2 and non-metallic yarn 1 at the four corners, which can simultaneously cope with axial tension and lateral pressure. The high modulus of the non-metallic yarn 1 can disperse stress, while the metal components 2 provide rigid support. The water-blocking layer 4 is a water-blocking strip, and the design of the armor layer 3 covering the water-blocking layer 4 can not only prevent water penetration, but also resist rodent bites and external mechanical impacts, making it particularly suitable for direct burial or complex terrain environments. The combination of the square outer sheath 9 and the central cavity 10 can achieve a compact layout. The separation design of the two sides of the asymmetrical plastic coating layer 7 avoids fiber ribbon overlap, reduces micro-bending loss, reduces mutual interference between multi-service fibers, and facilitates zonal operation during maintenance. An elastic filling layer is set between the asymmetrical plastic coating layer 7 and the water-blocking material 4 to allow the internal structure to deform when the optical cable is bent.

[0023] Specifically, in this embodiment, fiber 8 is a single-mode or multimode fiber.

[0024] Specifically, in this embodiment, the non-metallic yarn 1 is aramid yarn.

[0025] Specifically, in this embodiment, the metal part 2 is a non-metallic high-modulus material that matches the thermal expansion coefficient of aramid yarn, thereby avoiding stress concentration when the temperature changes, which could lead to cracking of the outer sheath 9 or separation of the interface.

[0026] Specifically, in this embodiment, the armor layer 3 is an S-shaped interlocking steel strip, thereby improving the compressive strength of the armor layer 3.

[0027] Specifically, in this embodiment, a polyethylene adhesive protective layer is provided between the armor layer 3 and the water-blocking layer 4. The polyethylene adhesive protective layer wraps around the edge of the steel strip, which helps to prevent damage to the internal structure.

[0028] Specifically, in this embodiment, the elastic filler layer 5 is filled with silicone rubber microspheres, so that the elastic filler layer 5 can have both elasticity and deformation resistance.

[0029] Specifically, in this embodiment, a thin thermoplastic elastomer membrane is added between the elastic filler layer 5 and the water-blocking layer 4 to protect the water-blocking layer 4, allowing deformation while preventing the water-blocking layer 4 from being squeezed and damaged.

[0030] Specifically, in this embodiment, the central reinforcing member 6 is made of FRP material. The use of FRP material can avoid electromagnetic compatibility problems caused by mixing with metal wire.

[0031] Specifically, in this embodiment, the outer sheath 9 is made of a low-smoke, halogen-free material.

[0032] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A ribbon optical cable with high lateral pressure resistance, comprising a plurality of optical fibers (8) and an outer sheath (9), characterized in that: The outer sheath (9) has a square cross-section and a central cavity (10) inside. Several optical fibers (8) are located inside the central cavity (10). A central reinforcing member (6) is provided between every two adjacent optical fibers (8). The outer periphery of several optical fibers (8) is sequentially covered with a heterogeneous plastic coating layer (7), an elastic filling layer (5), a water-blocking layer (4), and an armor layer (3). The gap between the armor layer (3) and the central reinforcing member (6) in the central cavity (10) is filled with a filling layer. Metal parts (2) are provided at the four corners inside the outer sheath (9). The metal parts (2) are covered with non-metallic yarn (1).

2. The ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The optical fiber (8) is a single-mode or multimode optical fiber.

3. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The non-metallic yarn (1) is aramid yarn.

4. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The metal part (2) is a non-metallic high-modulus material, which matches the thermal expansion coefficient of aramid yarn.

5. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The armor layer (3) is an S-shaped interlocking steel strip.

6. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: A polyethylene adhesive protective layer is provided between the armor layer (3) and the water-blocking layer (4).

7. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The elastic filler layer (5) is filled with silicone rubber microspheres.

8. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: A thin thermoplastic elastomer membrane is added between the elastic filler layer (5) and the water-blocking layer (4).

9. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The central reinforcing member (6) is made of FRP material.

10. A ribbon optical cable with high lateral pressure resistance according to claim 1, characterized in that: The outer sheath (9) is made of low-smoke halogen-free material.

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