Double-layer stranded all-dry type optical cable

Abstract

The invention discloses a double-layer stranded all-dry type optical cable, and relates to the field of communication optical cables. The double-layer stranded all-dry type optical cable comprises a central strengthening component, a double-layer stranded cable core, water-blocking tapes, reinforcement yarn and an outer sheath layer, wherein the central strengthening component is wound with water-blocking yarn; the double-layer stranded cable core is formed through SZ stranding of inner all-dry type loose tubes and outer all-dry type loose tubes, and comprises three structures: a structure of six tubes on the inner layer and twelve tubes on the outer layer, a structure of seven tubes on the inner layer and thirteen tubes on the outer layer, as well as a structure of nine tubes on the inner layer and fifteen tubes on the outer layer; each loose tube comprises twelve optical fibers and 1-2 pieces of water-blocking yarn and contains no ointment; the water-blocking tapes are wrapped between the inner all-dry type loose tubes and the outer all-dry type loose tubes and outside the double-layer stranded cable core; the surfaces of the water-blocking taps outside the double-layer stranded cable core are wound with the reinforcement yarn; tearing ropes are arranged on the reinforcement yarn; and the outer sheath layer is arranged outside the reinforcement yarn. The whole optical cable adopts an all-dry type structure; and the number of cores can reach 288 maximally, the ointment is not contained, the water-blocking performance of the optical cable can be maintained, the weight is reduced, the mechanical property of the optical cable is improved, the splicing efficiency of the construction is improved, and the environment is protected.

Description

technical field [0001] The invention relates to the field of communication optical cables, in particular to a double-layer stranded fully dry optical cable. Background technique [0002] With the continuous growth of broadband video services and the need for FTTH (Fiber To The Home, fiber-to-the-home) construction, the number of optical fiber cores of optical cables is also increasing. At present, the general structure of large-core optical cables is ribbon optical cables filled with ointment. This type of optical cable has the following three problems in practical applications: [0003] (1) Regardless of whether the central tube structure or the stranded structure is adopted, the excess length of the cabled optical fiber is small, so thicker optical cables or more reinforcing components are required to withstand external forces; [0004] (2) During the splicing process of the optical cable, the ointment should be cleaned with a cleaning agent, which reduces the splicing ef...

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Problems solved by technology

[0004] (2) During the splicing process of the optical cable, the ointment should be cleaned with a cleaning agent, which reduces the splicing efficiency;

[0005] (3) If it is laid vertically, the filling ointment will be lost under the action of gravity, reducing the water resistance of the optical cable and causing environmental pollution

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