Loose tube, loose tube type optical fiber cable, single-core separation method of loose tube optical fiber ribbon, method of manufacturing loose tube, and method of gathering multiple optical fibers

Abstract

The invention provides a loose tube, a loose tube type optical fiber cable, a method for separating single cores of an optical fiber ribbon of the loose tube, a method for manufacturing the loose tube and a method for gathering multiple optical fibers. The diameter reduction of loose tubes with optical fiber ribbons is realized. The present invention is a loose tube provided with a plurality of optical fibers and a tube for accommodating the plurality of optical fibers together with a filler. The plurality of optical fibers are constituted by discontinuously fixed optical fiber ribbons in which connecting portions for connecting adjacent optical fibers are discontinuously arranged, and in a state where the plurality of optical fibers constituting the discontinuously fixed optical fiber ribbons are bundled, The discontinuously fixed optical fiber ribbon is arranged in the sleeve.

Description

technical field [0001] The invention relates to a loose tube, a loose tube type optical fiber cable, a single-core separation method of an optical fiber ribbon of the loose tube, a manufacturing method of the loose tube and a line gathering method of multiple optical fibers. Background technique [0002] Patent Document 1 describes a loose tube optical fiber cable in which a plurality of loose tubes are arranged around a tensile member. The loose tube is a structure in which a plurality of optical fibers and glue (resin filling material) are accommodated inside the tube. When extruding a loose tube, a plurality of optical fibers and glue are introduced into the inner space of the molten tube material. At this time, since the jelly exists around the optical fiber, it is possible to prevent the molten sleeve material from coming into contact with the optical fiber. [0003] Patent Document 2 and Patent Document 3 describe optical fiber ribbon cores (hereinafter referred to s...

AI Technical Summary

Problems solved by technology

However, when an optical fiber ribbon that covers a plurality of optical fibers laterally arranged in a row with resin is placed in a loose tube without using a pinch tape like the optical fiber ribbons described in Patent Documents 2 and 3, the The ribbon width is wide, so when the loose tube is extruded, the molten tube material may come into contact with the ribbon

In addition, when disposing the optical fiber ribbon in the loose tube without using crimping tape, if they are separated from each other in order to avoid contact between the molten tube material and the optical fiber ribbon, because the core diameter of the layer of many optical fibers is large, Therefore, the diameter of the loose tube is enlarged

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