Butterfly self-support type sensing cable

Abstract

The invention discloses a butterfly self-support type sensing cable. The butterfly self-support type sensing cable comprises an outer protective sheath (3), reinforcing members (2) and sensing optical fiber (1). The sensing optical fiber (1) comprises a PBT (polybutylece terephthalate) pipe layer (4), a waterproof layer (5), an adhesion layer (6) and a fiber core (7). The inside of the outer protective sheath (3) is provided with the sensing optical fiber (1) and the reinforcing members (2), and the axises of the sensing optical fiber and a pair of the reinforcing members (2) are on the same plane. The cross section of the butterfly self-support type sensing cable is in a butterfly shape, thereby effectively preventing parasites from living in the concave surface of a traditional optical cable and avoiding ponding corrosion of rainwater; meanwhile, the sensing optical fiber is arranged at the portion with the smallest thickness of the outer protective sheath, accordingly the sensing performance of the sensing fiber to temperature and pressure is enhanced, and further the stability of the optical fiber during transmission can be improved.

Description

technical field [0001] The invention relates to a communication optical cable technology, in particular to a butterfly-shaped self-supporting sensor optical cable. Background technique [0002] The FTTH network has entered the accelerated construction period. In view of the economy and speed of FTTH construction, the optical cable and its access method applied to FTTH present characteristics different from the trunk network, such as miniaturization, easy-to-span branch, full-dry type, etc. characteristic cable. However, the traditional home optical cable generally adopts ordinary self-supporting butterfly-shaped lead-in optical cable, the suspension part and the optical unit are separated at the entrance, and the optical fiber unit directly enters the home, eliminating the need for indoor and outdoor optical cable transfer, and no need to set up suspension wires and hooks when laying , high construction efficiency and low cost. However, due to the thick outer sheath of the...

AI Technical Summary

Problems solved by technology

However, due to the thick outer sheath of the traditional self-supporting optical cable, the sensitivity is very low, and it is difficult to adapt to the harsh environment.

[0003] Chinese patent application number: CN201220528202 discloses a self-supporting drop optical cable, including an FRP central strengthening core, several single-core butterfly optical fibers, water blocking tape, composite aluminum tape, multi-strand steel strands and a polyethylene sheath. A number of single-core butterfly optical fibers are evenly distributed on the outer ring of the FRP central strengthening core, the water blocking tape wraps the several single-core butterfly optical fibers, the composite aluminum tape is arranged on the outer ring of the water blocking tape, the The multi-strand steel strands are located above the composite aluminum strip, and the polyethylene sheath is wrapped outside the composite aluminum strip and the multi-strand steel strands. This kind of optical cable can facilitate the overhead laying of optical cables, reduce the overhead density, and reduce the The cost and labor intensity of optical cable laying, but the ability of this optical cable to perceive the external environment is too poor

This kind of optical fiber sensor cable does not need additional equipment when it is applied to multi-branch, and saves optical cables. Compared with using couplers or splitters for branching, the energy loss and additional interference are very small, but this optical cable is resistant to Poor tensile performance, not suitable for aerial laying

[0005] Chinese patent application number: CN201220304442 discloses a composite sensing optical cable, including an optical cable casing and a number of single-core wire cores, the single-core wire cores are arranged in a ring, and the optical cable casing is wrapped in a single-core wire core bundle. , there is also a layer of aramid fiber reinforcement layer between the sleeve and the single-core wire core bundle to strengthen the optical cable, and at the same time, a single-core sleeve is wrapped on the outer layer of each single-core wire core, and the single-core sleeve And the cable casing is also filled with waterproof gypsum oil. Such an optical cable is easy to process and can effectively protect the optical cable. However, this optical cable has poor sensing performance and cannot effectively sense changes in external temperature and pressure.

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