JPS6319611A - Optical fiber tape core - Google Patents

Abstract

PURPOSE:To facilitate branching and to enable wide-range application including a wiring system by making the intermediate coating layer among coating layers of an optical fiber element wire harder than the inside and outside coating layers. CONSTITUTION:An optical fiber table core 10 consists of plural optical fiber element wires 12 arranged in parallel to one another and a batch protection coating layer 14 of ultraviolet curing resin provided to those optical fibers 12 at a time, and each optical fiber element wire 12 consists of an optical fiber 16 and plural coating layers 18 of ultraviolet curing resin provided thereupon. Each optical fiber element wire 12 has three coating layers 18A, 18B, and 18C, and the intermediate coating layer 18B is formed of a harder material than the inside and outside coating layers 18A and 18C. Consequently, the batch protection coating layer 14 and the outside coating layers 18C of the optical fiber element wires 12 are peeled off manually to easily separate the respective optical fiber element wires 12; and branching performance is improved and the application range is expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in optical fiber ribbons used in public communications.

(Prior art) In general, optical fiber ribbons consist of a plurality of optical fibers coated with an ultraviolet curable resin and arranged in parallel, and an ultraviolet ray applied to these optical fibers all at once. It consists of a collective protective coating layer of curable resin. This type of optical fiber ribbon can be manufactured at high speed since a plurality of optical fiber ribbons are manufactured at once, and therefore can be provided at a low price, and has been put to practical use in feeder systems of optical subscriber lines. On the other hand, it has been difficult to use this type of optical fiber tape for wiring systems for various reasons. One reason for this is that, for example, there is a large loss when connecting single mode fibers in multiple fibers, and another reason is that it is difficult to apply the free wiring method, which is a typical method for optical subscriber wiring. It is. In particular, when introducing optical fiber tape into a relay system or wiring system, it is not possible to separate individual optical fiber east lines when branching due to increased demand with conventional optical fiber tape. was the problem.

(Objective of the Invention) The object of the present invention is to provide an optical fiber ribbon which can be easily branched into a single branch, can be applied to a wide range of applications including wiring systems, is wear-resistant, and is easy to handle. There is a particular thing.

(Structure of the Invention) The optical fiber ribbon according to the present invention comprises a plurality of optical fibers arranged in parallel in a plane with a plurality of coating layers provided on each optical fiber, and these plurality of optical fibers. For bare fiber! It consists of a protective coating layer applied all at once.

The intermediate coating layer of the plurality of coating layers of the optical fiber strand is characterized in that it is harder than the inner and outer coating layers.

In this way, optical fiber strands that match vi can be easily branched by manually peeling off the collective protective coating layer and the outer soft coating layer of each optical fiber strand, so that the branchability is reduced. It is a relay system because it improves performance and allows the free wiring method to be applied.

The range of applications will expand to include configuration U systems.

(Example) An example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an optical fiber tape core 10 according to the present invention,
This optical fiber tape core 10 consists of a plurality of optical fibers 12 arranged in parallel with each other and an ultraviolet curable resin applied to these plurality of optical fibers 12 all at once. It consists of a protective YU layer 14. 8 optical fiber strands 12 as shown in FIG.

In the illustrated embodiment, each optical fiber strand 12 is comprised of an optical fiber 16 and a plurality of fQ layers 18 of ultraviolet curable resin provided on one of the optical fibers 16 and 18.
8B, , 18c, and the intermediate covering layer 18B of these plurality of covering layers L8 is made of a harder material than the inner and outer layers 17) of the covered layers 18A and 18C.
for example.

18B has a Yag modulus of 50 K g/mm 2cy). When configured in this way, the protective coating layer 1
4 and the outer coating layer 18c of each fiber strand 12, each optical fiber strand 12 can be easily separated, and the inner soft coating layer 18A acts as a buffer layer. In this case, it was confirmed that all of the temperature characteristics, lateral pressure characteristics, and bending characteristics were satisfied. The outer diameter of each of the plurality of coating layers 18A, 18B, and 18C is, for example, 0. '2mm, 0.25mm, 3m
m, and the total thickness of the optical fiber tape is L.
3 a mm, ro is 1.6 mm. In the above embodiments, only the case where an ultraviolet curable resin is used is used, but other resins such as a thermosetting resin may also be used.

(Effects of the Invention) According to the present invention, as described above, the protective coating layer and the soft coating layer on the outside of each optical fiber can be easily removed manually by tearing with a fingernail or the like. This has the practical benefit of improving branching properties and expanding the scope of its application.

[Brief explanation of the drawing]

FIG. E7'S1 is a sectional view of an optical fiber ribbon according to the present invention, and FIG. 2 is an enlarged sectional view of one optical fiber strand. 10---- Tape core wire to the first wire, 12------
Optical fiber strand, l 4---- Collective protective coating layer,
16---Optical fiber 8, 18A, 18B, 18C-
---One or more coating layers. 1st al 2nd figure hand d-? City IE Se2 ([1-8) 71110, 1988

Claims (1)

[Claims] Consisting of a plurality of optical fibers each provided with a plurality of coating layers and arranged in parallel in a plane, and a collective protective coating layer applied to the plurality of optical fibers all at once. 1. An optical fiber ribbon, wherein an intermediate coating layer of the plurality of coating layers of the optical fiber is harder than inner and outer coating layers.