JPH05205541A - Overhead earth-wire containing optical fiber - Google Patents

Abstract

PURPOSE:To enhance waterproofing so as to prevent the loss increase and breakage, etc., of an optical fiber unit based on the infiltration of rain water or the like by providing a molded layer made of wound water-proof tape or a water-proof material on the external periphery of an optical fiber unit. CONSTITUTION:An optical fiber unit A is composed in such a manner that core wires 2 housing optical fiber cables 1 in its grooves is housed in an aluminum tube 3, and a water-proof tape 4 is wound around the external periphery of the unit A. This tape 4 is composed of a water-proof and wrappable material such as a polyethylene tape. Strands B are twisted around the external periphery of the wrapped tape 4 so as to form an overhead earth-wire. Accordingly, since waterproof against the unit A can be remarkably enhanced, the corrosion of the aluminum tube serving as an exterior material of the unit A due to rain water or the like can be prevented so that infiltration of rain water or the like based on the corrosion can be penetrated, even when installed at the seacoast and the like where rain water, etc., containing salinity is applied thereto. Accordingly, the reliability of optical fiber communication and the durability of an overhead earth-line can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead ground wire containing an optical fiber having an optical fiber unit housed therein.

[0002]

2. Description of the Related Art A conventional ground wire containing an optical fiber is shown in FIG.
As shown in, with respect to the outer circumference of the optical fiber unit A,
The wires B were directly twisted together.

[0003]

With the above-mentioned conventional product, for example, when it is erected on the seashore, the seawater which is scattered when the wind is strong is impregnated from the strand B from the twisted optical fiber. You will reach Unit A. Since the seawater contains salt, it corrodes the aluminum pipe which is the outer layer material of the optical fiber unit A. When such a situation occurs, rainwater or the like may enter the optical fiber unit A, which may cause an adverse effect on the optical fiber cable, that is, increase in loss of the optical fiber or disconnection of the optical fiber. The invention is intended to solve such a problem in the prior art.

[0004]

According to the present invention, a waterproof tape 4 is wound around the optical fiber unit A or a mold layer 5 made of a waterproof material such as a rubber material is provided around the optical fiber unit A. By improving the waterproof property of the unit A, the problems such as the loss increase of the optical fiber and the disconnection due to the intrusion of rainwater and the like are solved.

[0005]

FIG. 1 shows an embodiment of the present invention.
In the figure, A is an optical fiber unit, which is formed by housing a core wire 2 in which an optical fiber cable 1 is housed in a groove in an aluminum tube 3. 4 is a waterproof tape, which is wound around the outer circumference of the optical fiber unit A. In the illustrated embodiment, about 1/2 of the wrapping is applied. The waterproof tape is made of a material such as polyethylene tape that is waterproof and can be wrapped. Then, as shown in FIG. 3, strands B are twisted together to form an overhead ground wire on the outer periphery of the wrapped waterproof tape 4, but the strands B are omitted in FIG. There is.

FIG. 2 shows another embodiment of the present invention. This is for the outer circumference of the optical fiber unit A,
A mold layer 5 made of a waterproof material such as a rubber material or a non-corrosive material having a waterproof function in place of the waterproof tape 4 described above.
Is provided. By adopting such a configuration, the waterproof effect will be further improved. Note that, in FIG. 2, as in the case of FIG. 1, the wire B is omitted.

[0007]

According to the present invention, the waterproof tape 4 is wound around the optical fiber unit A, or the mold layer 5 made of a waterproof material such as rubber is provided.
The waterproofness of the optical fiber unit A is significantly improved. Therefore, the overhead ground wire containing an optical fiber according to the present invention corrodes the aluminum pipe, which is the outer layer material of the optical fiber unit A, by the rainwater even if the rainwater containing salt is applied to the overhead ground wire. This prevents the intrusion of rainwater and the like due to the corrosion.

After all, according to the present invention, it is possible to well avoid the occurrence of a situation such as rainwater intrusion into the optical fiber unit A, and solve the problems such as the increase in loss of the optical fiber and the disconnection due to the infiltration. The reliability of the optical fiber communication and the durability of the overhead ground wire are remarkably improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of the present invention.

FIG. 2 is a perspective view showing a main part in another embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional product.

[Explanation of symbols]

 A optical fiber unit B strand 1 optical fiber cable 2 core wire 3 aluminum tube 4 waterproof tape 5 mold layer

Claims (2)

[Claims] 1. A waterproof tape (4) is wound around the outer circumference of an optical fiber unit (A), and a wire (B) is wound around the outer circumference.
An aerial ground wire with an optical fiber characterized by being twisted together. 2. An optical fiber characterized in that a mold layer (5) made of a waterproof material such as a rubber material is provided on the outer periphery of an optical fiber unit (A), and a strand (B) is twisted around the outer periphery thereof. Entered overhead ground line.