JPS59154404A - Pipe covered optical fiber and its terminal processing method - Google Patents

Abstract

PURPOSE:To perform terminal processing simply and quickly by hardening the filler at the terminal of pipe covered optical fiber by bringing the filler into reaction with a hardening agent. CONSTITUTION:The filler 4 of pipe covered optical fiber 1 consists of a base in two-liquid type RTV silicone rubber which is hardened by heating or at normal temperature. When processing the terminal 1' of the pipe covered optical fiber 1, a specified quantity of hardening agent 6 is injected from the end face of the pipe covered optical fiber 1 or from its outer periphery or from these two places into the tublar cover layer through an injector 5, and the filler 4 is hardened by bringing it into reaction with the hardening agent 6. When a hardened part 7 is formed at the terminal 1' of the pipe covered optical fiber 1, flowing-out of the filler 4 is suppressed by stopping effect of the hardened part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe-coated optical fiber and its termination method.

In addition to the general coated optical fiber with a tight structure, there are coated optical fibers with a loose structure in the original fiber coated fiber. A quartz-based optical fiber having a secondary coating is housed in a plastic pipe-shaped coating layer, and a liquid filler such as silicone oil is interposed between the outer periphery of the primary coating and the inner periphery of the pipe-shaped coating layer.

The advantage of the above-mentioned loose structure over the tight structure is that the original fiber (glass) and the pipe-like temporary cover layer (
Even if the coefficient of linear expansion is different from that of the optical fiber (plastic), the liquid filling material interposed between them allows smooth movement between the optical fiber and the pipe. As the coating layer contracts in the longitudinal direction, the nine fibers fit into the pipe in a gentle meandering state, so even if the pipe-shaped coating layer expands or contracts due to temperature changes, the expansion and contraction force will be applied to the original fiber. Therefore, the above-mentioned loose structure is good in this respect, and it can be said that the problem of increased transmission loss is unlikely to occur.

On the other hand, when these pipe-coated optical fibers are connected to each other, there is a risk that the liquid filler may flow out from the end of the pipe-shaped coating layer, and furthermore, the optical fiber may not be stable within the pipe-shaped coating layer. Therefore, the above connection becomes difficult and time-consuming.

On the other hand, increasing the viscosity of the filler seems to solve the above-mentioned problems, but the appropriate viscosity must be set by balancing the degree of freedom of the optical fiber within the pipe-shaped coating layer and preventing the filler from flowing out. However, as the viscosity of the filler increases, it becomes more likely that the filler will clog the extruder when coating the outer periphery of the optical fiber.

Furthermore, during terminal processing for connection, etc., there is a risk that transmission loss will increase due to air bubbles being mixed in due to the filling material being washed away.

In view of the above-mentioned problems, the present invention provides a loose optical fiber core wire in which it is easy to take measures to prevent the filler from flowing out by improving the structure of the filler in the Tsuquib coated optical fiber, and further based on this, The present invention aims to provide a method for easily processing the terminals of pipe-coated optical cores.

The specific configuration and method will be explained below using illustrated examples.

The pipe coated optical fiber 1 shown in FIG. and a fluid filler 4 interposed between the layer 3 and the layer 3.

The optical fiber wire 2 in the above is a quartz-based optical fiber consisting of a core and a cladding, and a
Although it is composed of a next coat and a buffer coat, it is possible that only one of the above two coats is formed on the original fiber strand 2, or that the strand 2 consists only of a bare optical fiber. There is also.

Incidentally, when the optical fiber wire 2 has a primary coat, a buffer coat, etc., the material of these coats is, for example, a silicone-based thermosetting resin.

On the other hand, for the pipe-shaped coating layer 3, a thermosetting resin (polyester, epoxy, etc.), thermoplastic resin (nylon, polyethylene, polycarbonate, etc.) with high mechanical properties is used, and in particular, extrusion molding means is used. When forming the pipe-shaped coating layer 3 on the outer periphery of the optical fiber 2 through the
Thermoplastic resin is used.

The filler 4 used is one that has fluidity, such as liquid, sherry, or paste, and that hardens by reacting with a hardening agent.

More specifically, the filler 4 is made of a two-component type thermosetting resin main ingredient that is cured by heating or at room temperature.As a specific example, the filler 4 is a two-component type [consisting of the main ingredient in TV silicone rubber].

The base resin and the corresponding curing agent in the above are shown in the table below.

In addition, the base polymer, crosslinking agent, and curing catalyst in the table refer to the following.

A diorganosiloxane with a functional group at the two ends of the base polymer.

Crosslinking agent A trifunctional or higher functional silane or siloxane O that connects the two base oils and crosslinks them to form a three-dimensional rubber elastic body.Curing catalyst: A noble metal catalyst for reacting the base polymer and the crosslinking agent.

In the pipe-coated optical fiber 1 of the present invention having the above-described structure, the filler 4 not only has fluidity but also has a chemical property of being hardened by reaction with a hardening agent. ing.

Therefore, the fluidity of the filler 4 not only provides various effects as a loose optical fiber, but also allows the filler 4 to react with a hardening agent and harden during terminal treatment. This makes it possible to easily prevent the filler from flowing away and air bubbles from entering the pipe-like coating layer 3, and also prevent the situation where the longitudinal middle part of the pipe-like coating layer 3 is damaged and the filler 4 leaks from there. Even if a leak occurs, by injecting a hardening agent into the layer 3 through the cracks in the pipe-shaped coating layer 3 and hardening the filler 4 near the damaged area, emergency measures against filler leakage can be easily taken. will be taught.

Furthermore, when cutting the long pipe-coated optical fiber 1 into regular lengths, an injector (curing agent injector) is inserted into the pipe-shaped coating layer 3 at regular intervals to spot-cure the filler material 4. If the fiber is cut at the hardened portion, the long pipe-coated optical fiber can be cut to a regular length without the filler flowing out.Next, the terminal processing method of the present invention will be explained with reference to FIG.

As shown in 1+111, Example 2, y1j3 in the table above, the filler 4 of the pipe-coated optical fiber 1 consists of a base polymer and a crosslinking agent, or a base polymer, or a base polymer and a curing catalyst.

Therefore, during the terminal treatment of the pipe-coated optical fiber 1, if the filler 4 is of Example 1, a curing catalyst is used as the curing agent, and if the filler 4 is of Example 2, the curing catalyst is used as a curing agent. When a curing agent and a curing catalyst are used, and the filler 4 is of Example 3, a crosslinking agent is used as the curing agent.

As shown in FIG. 2, the terminal portion 1 of the pipe-coated optical fiber 1
', for example, the above-mentioned predetermined curing agent 6 is stored in the injector 5, and the injector 5 is used to inject the pipe-coated optical fiber from the end face of the coated optical fiber 1, or from the outer periphery thereof, or A predetermined amount of curing agent 6 is injected into the pipe-shaped coating layer 2 from these two locations, and the curing agent 6 causes the filler 4 to undergo a curing reaction.

When the hardened portion 7 is thus formed at the end portion 1' of the pipe-covered optical fiber 1, the plugging effect via the hardened portion 7 prevents the filler 4 from flowing out.

In addition, when the filler 4 is a room temperature curing type, its hardness iK
Although there is no need for heating, in the case of a heat curing type, it is cured using an appropriate heating means.

Frozen 1. A hardening type filling layer 4 is used to irradiate the inside of the pipe-covered optical fiber 1 from the end surface thereof with a ray of light.

On the other hand, in the above example, the injector 5 is valved to inject the curing agent 6, but this can be done by immersing the end portion 1' of the pipe*covered fiber 1 in a curing agent tank, or by adding the curing agent to the same end surface. 6 may be sprayed.

Furthermore, when forming the hardened portion 7 as described above, the first and second
9. Shape the end of the original fiber 2 into a vibrator like virtual scarlet:
fj3. It is also possible to pull it out from the top of the cover layer 3 and place it there.Conversely, after the hardened part has been formed, it can be pulled out from the bottom part 1' of the cover layer 3.
It is also possible to expose the optical fiber by partially removing the vibrator-shaped fracture layer 2, the hardened layer 7, etc., and in this way, the end of the optical fiber can be pulled out.
~In the case of burying the original fiber, 7+'7 connection, sleep connection, connector 4)i:connection, etc. can be easily done.

In concrete 1, a silicone rubber-based filler 4 with a viscosity of 2990 CP (25°C) and a specific gravity of 103 was used as the curing agent 6, and a viscosity of 7000 P and a specific gravity of 0 were used as the curing agent 6.
．． 1. Using 99 items. h; h et al. filling 444, i1! !
! 1) Add the curing agent 6 to the end portion 1' of the fiber 1 at a mixing ratio of 10:1.
、、、Heat for 7 seconds at 150℃／・＝ and ζro、Meat J
'71 mm, V ibinsa 37 (J I S-A,
), a hardened part with a specific gravity of 103 is formed, which prevents the filling from the pipe-like grade layer 3 from being washed away. In this method, a fluid filler is interposed between the optical fiber and a vibrator-like covering layer provided on its outer periphery, and the filler reacts with a hardening agent. Therefore, it does not have the properties of a loose structure, and it is easy to prevent the filling system from flowing out.

Further, in the method according to the present invention, a fluid filling layer is interposed between the original fiber strand and a pipe-shaped coating layer provided on its outer periphery, and the filling layer interacts with the curing agent during curing. In the y-seat processing force method of a pipe coated optical fiber consisting of a composition, the filling efficiency at the terminal part of the pipe coated optical fiber is reacted with a curing agent and the light at the terminal part, IIi:i
Since it is characterized by mutual curing, terminal processing can be performed extremely simply and quickly.

[Brief explanation of drawings]

Figure 1 shows the 11th pipe covered by the 4th summer summer.
FIG. 2 is a cross-sectional explanatory view showing one embodiment of the method of the present invention. 1...Pipe-covered optical fiber 1'...Terminal part 2 of pipe-covered optical fiber...
・Original fiber wire 3... Bino-like coating layer 4... Filler 5e... φ Coin/Ecta 6... Curing agent 7... Curing part Tokura -Out 1 Nyojindai Misakito Patent Attorney I Fuji ~ Makoto f Figure 2

Claims (1)

[Claims] A fluid filling phase is interposed between the (υ original fiber body and a tube-like coating layer provided on its outer periphery), and the filler undergoes a curing reaction with a curing agent. A pipe-coated optical fiber consisting of a composition of (2) The pipe-coated optical fiber according to claim 1, wherein the filler is made of a silicone rubber base polymer. (3) A pipe-coated optical fiber according to claim 1, in which the filler comprises a silicone rubber base polymer and a crosslinking agent. +4+ A patent in which the filler comprises a silicone rubber base polymer and a curing catalyst. The pipe-coated optical fiber according to claim 1. (5) A fluid filler is interposed between the optical fiber strand and the pipe-shaped coating layer provided on the outer periphery of the optical fiber, and the filler' In a method for terminal treatment of a pipe-coated optical fiber having a composition in which # is a composition that undergoes a curing reaction with a curing agent, a pipe-coated light that causes the filler at the end of the coated optical fiber to react with the curing agent to harden the filler at the end. Terminal treatment method of fiber. +6+ Terminal treatment of a pipe-coated optical fiber according to claim 5, wherein the filler material is a silicone rubber base polymer, and the curing agent is a crosslinking agent and a curing catalyst. Force method. +7+ The method for terminal treatment of a pipe-coated optical fiber according to claim 5, wherein the ffi cross member is made of a silicone rubber base polymer and a crosslinking agent, and the curing agent is a curing catalyst. (8) Filling The method for terminal treatment of a pipe-coated optical fiber according to claim 5, wherein the material is a silicone rubber base polymer and a curing catalyst, and the curing agent is a crosslinking agent.