Super-high-density central tube cable

Abstract

The invention provides a super-high-density central tube cable comprising a loose tube. Single-strand or multi-strand fiber bundles are arranged inside the loose tube and are gathered into a spirally twisted core. Curable resin is intermittently adhered among a plurality of optical fibers in each fiber bundle. The loose tube is sequentially covered with a waterstop layer, a corrugated steel tape layer and a sheath which are concentric with the loose tube. The super-high-density central tube cable further comprises a pair of reinforcing cores penetrating the sheath. The fiber bundles are spirally twisted, density of fibers in the loose tube is increased, the diameter of the cable is decreased, and tensile performance of the cable is improved; all fibers are closer to the geometric center of the loose tube and well uniform in residual length; the reinforcing cores symmetrically arranged ensure symmetric thickness of the sheath and prevent stress concentration, and the fibers are intermittently adhered through the resin so that the fibers have a greater degree of freedom; the structural size of the cable is greatly decreased, and limited communication pipeline resources can be saved.

Description

technical field [0001] The invention belongs to the field of central bundle tube optical cable, in particular relates to a high-density central bundle tube optical cable. Background technique [0002] With the continuous growth of information transmission volume and broadband business demand, and the need for fiber-to-the-home construction, the demand for large-core optical cables has increased significantly. However, large-core optical cables are limited by the space of urban underground pipelines. In order to reduce the structural size of the large-core optical fiber cable, the optical fiber density in the middle can make the large-core optical fiber cable suitable for the existing urban underground sub-pipes. [0003] The maximum number of cores of ordinary central tube optical cables can only be 12 cores, because the number of optical fibers in the loose tube is limited by the 12 colors of the colored optical fibers, and the maximum number of cores in a loose tube can on...

AI Technical Summary

Problems solved by technology

[0003] The maximum number of cores of ordinary central tube optical cable can only be 12 cores, because the number of optical fibers in the loose tube is limited by the 12 colors of colored optical fibers, and a loose tube can only reach up to 12 cores

In order to break through this limitation, the prior art adopts the following three methods: 1. Color ring: Spray a color ring on the optical fiber of the same color to show the difference, but the diameter of the optical fiber is very small, it is difficult to identify the color ring during use, and it is easy to go wrong

2. Bracketing yarns in groups: 12 cores are used as a unit, and different colors of yarns are used to distinguish them. This method leads to excessive size of loose tubes, reduced production speed, and unstable fiber length.

3. The use of 12-core optical fiber ribbon is one of the effective ways to increase the density of optical fibers in the cable, but because the laminated body of the optical fiber ribbon is rectangular, it still wastes a certain amount of space in the loose tube

This structure has disadvantages such as uneven excess length and excessive distortion of sidebands.

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