JPS599608A - Tape-like optical fiber core - Google Patents

Abstract

PURPOSE:To obtain a tape-like optical fiber core which is strong to bending and twisting by covering collectively plural pieces of juxtaposed optical fiber strands with a gel-like material layer and covering collectively the outside circumference thereof with a polymer collective covering layer like a tape. CONSTITUTION:A tape-like optical fiber core is formed by covering collectively plural pieces of juxtaposed optical fiber strands with a gel-like material layer 3, and covering the outside circumference thereof with a polymer material collective covering layer 2 like a tape. The respective optical fiber strands 1 formed by providing primary covering layers on the outside of the optical fibers are used. For example, silicon gel is used as the gel-like material. The layer 2 is formed by extrusion coating with, for example, nylon or the like. Then, the respective strands 1 are virtually freely movable in the layer 3; therefore, even if the tape-like optical fiber core is subjected to bending or twisting, the increase in the transmission loss is suppressed. The tape-like optical fiber core strong to bending and twisting is thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a μ-shaped light beam.

The conventional Chive optical fiber core is K as shown in Fig. 1.
It was a structure in which several optical fins (cable wires 1) were arranged in RLK rows and covered with a tape-like layer 2 of a polymeric material such as nylon.However, such a structure However, when bending -f stress is added, direct VC distortion is added to the optical fiber main line I VC.In particular, there is a drawback that
-The optical fiber element [1 similar to FefFi] had the disadvantage that stress was likely to concentrate and transmission loss increased after the twisting process.

An object of the present invention is to provide a tape-shaped optical fiber core wire that is resistant to bending and twisting.

In the tape-shaped optical fiber core wire according to the present invention, a plurality of optical fiber strands arranged in parallel are encased in a layer of gel-like material, and the outer periphery thereof is collectively coated with a polymeric material in the form of a tape. The optical fiber is cored with layers, and the inner surface spacing in the tape thickness direction of the layer surrounding the gel material layer is set to be less than twice the outer diameter of the optical fiber strand.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a first embodiment of the present invention, and the tape-shaped optical fiber core wire of this embodiment includes a plurality of optical fibers 1 arranged in parallel that are collectively layered with a gel-like material layer. covered with 3,
It has a structure in which the outer periphery is bound together in a tape-like manner by a polymeric S layer 2. Layer 2 surrounding gel material layer 3
The distance in the tape thickness direction is 2 of the outer diameter of the optical fiber 1.
It is set at less than double. Each party fiber strand 1 is an optical fiber provided with a VC primary coating on the outer periphery, or 1
A material with a buffer layer provided around the outer periphery of the next coating layer is used. As the gel material, for example, silicone gel is used. Such a gel-like substance has no fluidity, has a self-healing function (self-fusion when cut), and has a Young's modulus of approximately zero. For example, the polymer material bulk fracture layer 2 has a Young's modulus of 0.01 Kg/'cy.
It is formed by extrusion coating of a polymer material of about d or higher, such as nylon.

In such a tape-shaped optical fiber core, each fiber element ffJ1 can move almost freely within the gel-like material layer 3, so when stress is applied, the optical fiber element 1 escapes and the fiber element ffJ1 can be moved in a state with a minimum work force of 6. This results in stability, and therefore, even if bending or twisting is applied, the increase in transmission loss can be suppressed. In addition, since the inner surface interval in the tape 1 direction of the layer 2 that wraps the gel material No. 3 is a groove equal to the outer diameter of the optical fiber 1, the moving optical fiber 7 and the optical fiber 1 are adjacent to each other. can be prevented from climbing over the bare optical fiber.

Figure 3 shows the j! of the present invention. 42 examples are shown.

The YT fiber core wires of this example are arranged in parallel. , its surface V
(Apply surface treatment firmness and crosslink and harden the surface?<m
It has a structure in which one hardened layer 4 is formed, and a cylinder material collective removal dove 2 is provided on the hardened layer 4. Jyj surrounding the gel material layer 3
The inner surface interval in the lateral direction of the tape J1 of No. 4 is set to be less than twice the outer diameter of the optical fiber wood fiber 1.

Even in such a case, the effects of the first embodiment and the recovery method can be obtained.

[Explained above]: In the cheap optical fiber core according to the VC of the present invention, the optical fiber cables arranged in parallel are collectively covered with a layer of gel-like material, and a tape-like polymer material is formed as a whole. Since each optical fiber element is housed in the sand layer, each fiber element can move almost freely (C), and when stress is applied, the optical fiber cable will break and stabilize in a state of minimum stress. Therefore, even if bending or twisting is applied, the increase in transmission loss of the optical fiber waterline can be suppressed.The inner tm interval in the tape thickness direction of the layer surrounding the glue-like substance layer is equal to the optical fiber waterline. Since it is less than twice the outer diameter of
It is possible to prevent the moving optical fiber water line from crossing over the adjacent Optical 7 Aiper wire.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional tape-shaped optical fiber core, 8
Figures 142 and 3 are cross-sectional views of the present invention V (Embodiment 1.8142 of the tape-shaped optical fiber core wire according to the present invention. 1... Optical fiber water line, 2... All polymer materials) Nucleation layer, 3... gel-like substance layer, 4... surface hardening layer.

Claims (1)

[Claims] A plurality of optical fiber wires arranged in parallel are encased in a gel-like substance layer, and the outer periphery thereof is encased in a tape-like polymeric material 6i layer, and the gel-like A tape-shaped optical fiber core wire, characterized in that the inner surface spacing in the tape thickness direction of the layer surrounding the material layer is determined to be less than twice the outer diameter of the optical fiber wire.