JPS59117A - Method for connecting optical fiber - Google Patents

Abstract

PURPOSE:To eliminate the inconvenience in handling fiber cores when optical fibers are connected with each other, by closely putting a thermo-contracting tube on the core of the fibers to be connected after they are exposed, and then, performing necessary work. CONSTITUTION:This invention relates to the connection of optical fibers 50 having only the primary cover or having the primary cover and secondary cover with a vacant space inbetween. The connection of this invention is performed in such a way that necessary connecting works, such as removal of covers, connection of optical fibers, reinforcement of connected parts, treatment of excess lengths, connection of outer covers 52, etc., are performed with conventional jigs after the outer diameter of the connecting part of the cable 50 is enlarged by exposing the fiber core 10 from the cable 50, closely putting a thermo-contracting tube 60 on the exposed part, and then, contracting the tube 60. Since these works are performed on the fiber core 10 covered with the thermo-contracting tube 60, the fiber core 10 can be handled easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting optical fiber cables, and particularly to handling of fiber cores during connection.

Background of the Invention 1 - As shown in Figures 1 and 2, the most common structure of the fiber core 10 is one in which a primary coating 60 and a secondary wave N40 are provided on a glass fiber 20. be.

The primary coating 60 has the main purpose of maintaining the strength of the glass fiber 20 itself, and is, for example, a thin layer of urethane (see FIG. 1), a modified silicone rubber 32 and a silicone rubber 6, etc.
4 (Fig. 2).

The secondary coating 40 has the main purpose of reducing or interrupting the stress applied to the glass fiber 20, and is made of, for example, plastic (such as nylon) having a high Young's modulus.

A plurality of the following fiber core wires 10 are bundled, and the outermost layer is covered with a jacket 52 to form an optical fiber cable 50.

When connecting this optical fiber cable 50, the following work procedure is usually followed.

1) Remove the outer sheath from the fiber core 10, /7n
Cut out the fiber core 10, allowing for an extra length of about

2) Removal of coating: secondary coating 4 at the end of fiber core 10
0 and the primary sheath 1130 are removed and mirror cutting is performed.

3) Connection: For example, the glass fibers 20 are connected to each other by being fixed to a fusion splicer. Connectors may also be used.

4) Reinforcing the connection part: There are methods of using heat-shrinkable timber, epoxy resin, silicone resin, etc.

5) Extra length processing' For example, there is a method of making a loop in the fiber core 10 and winding it around a bobbin.

6) Connection of the jacket 52 However, in the optical fiber cable 50, - the fiber core 10 does not have the secondary jacket 40, for example [@3 As shown in FIG. There is also one that consists of a fiber core 10 that is simply provided. When I try to connect such a cable using the steps above,
]) The fiber core 10 is thin and difficult to handle; 2) There is a risk of damaging the fiber core 10; 3) Especially -
Those using silicone rubber 64 for the next coating filter O have problems such as being sticky and difficult to handle.

In addition, in the fiber core wire 10, as shown in the figure, the secondary coating AO is made of metal (such as aluminum), hard plastic,
There is also a structure that uses a similar pipe and has an empty M42 inside. When connecting an optical fiber cable made of such a fiber core 10, during the above step 1) in which the fiber core 10 is exposed, the secondary sheath 40 of the pipe is removed along with the outer sheath, and then -1- 2) Perform the following connection work. Therefore, the glass fiber 20+-
In this case, the work is difficult as well, since the fiber core 10, which is very thin and has only the GJ coated with the secondary coating 60, is to be handled.

This invention makes it possible to solve the difficulty in handling the fiber core 10 in the above-mentioned cases.

Structure of the invention (1) The following fiber core wire 10\i.e. 11)-
Fiber core wire 10 with only secondary coating 60 and no secondary coating 40
(FIG. 3), or 2) Even if there is a secondary coating 40, the fiber core 1 has a structure in which there is a gap 42 between the secondary coating 40 and the primary coating 60.
0 (Fig. 1))); (2) After opening the above-mentioned fiber core 10 (Fig. S), a heat shrink tube 60 is tightly attached to it. The method is characterized by the following: 1. Covering the roof (Fig. 3), and then performing the necessary connection work as described in 2.

Heat shrink. - For example, cross-linked polyethylene is used as the material for Pro0.

It should be noted that it is currently made according to the most common patterns such as Figure 1, Figure 2, and Figure 2. Therefore, by covering the heat shrink tube 60 so that the outer diameter after shrinking is approximately 0.9 l + 1 m, conventional jigs can be used as is.
It's convenient.

Further, the "necessary connection work" refers to the above-mentioned work of removing the coating, connecting the glass fiber 20, reinforcing the connection part, processing the excess length, and connecting the outer sheath 52. These operations are performed on the fiber core 1 covered with a heat shrink tube 60.
Since this is done for 0, it is easy to handle.

Effects of the invention [-1] After covering the exposed fiber core 10 with heat-shrinkable wire and -PRO 0, the necessary connection work is performed, so even if there is a fiber core 10 without a secondary covering i40, it is easy to handle. becomes easier.

[Brief explanation of drawings]

1, 2 and 3 are explanatory diagrams of a cross section of the fiber core 10, FIG. 3 is an explanatory diagram of a cross section of the fiber core 10 without the secondary coating 40, and FIGS. An explanatory diagram showing the method of the present invention in order of steps. 10: Fiber core wire 20 Ni glass fiber 60 Ni primary coating 40: Secondary coating 42: Gap 5 []] ゛9 Fiber wool 2: Sheath 6 []: Heat shrinkable tube, -

Claims (1)

[Claims] An optical fiber having a structure in which there is no secondary coating after the primary coating, or even if there is a secondary coating, there is a gap between the secondary coating and the primary coating. When connecting the fiber cable, after extending the fiber core wire by 1 inch, put a heat shrink wire on top of it. - A method for connecting an optical fiber cable, characterized by closely covering the cable with a cable, and then performing necessary connection work.