JPS6132014A - Multiple core optical fiber unit - Google Patents

Abstract

PURPOSE:To make separation and connection of optical fiber very easy by containing flat parallel optical fiber having separating grooves in shallow grooves of a grooved metallic spacer and covering the outer periphery with a protecting layer. CONSTITUTION:Two optical fibers are arranged parallel, and flat braid type parallel two-core fiber unit 2 covered with a covering layer having grooves for separation 7 is contained inside shallow grooves of a metallic spacer 3, and the outer periphery is covered with a protecting film 4. As the grooves of the spacer 3 are shallow, manufacture is easy, and the unit 2 is of flat parallel type and thin, the strength can be maintained even when the outer diameter of the spacer is made small. The optical fiber 1 can be separated easily by the separating grooves and can be connected easily to other optical fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a spacer-supported multi-core optical fiber unit.

[Background Art] Recently, there has been an increasing need to increase the number of optical fiber units on the optical fiber composite overhead ground wire (0PGW) side. When increasing the number of fibers from a single-core optical fiber, the strength of the edge of the spacer groove decreases, making it vulnerable to crushing loads, resulting in a poor space factor for storing a large number of optical fibers. This makes it difficult to use multiple cores.

In order to solve this problem, it is common sense that the space factor can be expected to be improved by integrating 3-core or 7-core optical fibers and inserting them into the grooves of the spacer. Twisting the wires also has the advantage of increasing strength.

However, in this case, the optical fiber is usually clad or
Since three or more fibers are twisted together in a coated state and then covered with a coat, it is more susceptible to lateral pressure and causes transmission loss.When connecting to other optical fibers, etc., separate each fiber one by one. You need to make a connection, which can be difficult.

[Objects and Structure of the Invention] The present invention was made in response to the increase in the number of optical fibers, and is intended to solve the above-mentioned problems. A grooved metal wire spacer that uses a two-core flat parallel optical fiber and has wide and shallow grooves on its surface! f? This is a multi-core optical fiber unit in which the above-mentioned optical fibers are housed in the + and a protective layer is provided thereon, and the optical fibers can be separated and connected very easily.

The present invention will now be explained with reference to embodiments shown in the drawings.

In FIG. 1, 3 is a metal surface such as aluminum wire, and a plurality of, for example, wide and shallow jIW 5 on the surface perpendicular to the cross section are arranged in a straight line in the length direction. It is formed into a shape or a spiral, and serves as a tensile/gosome nova and an optical fiber support.

Reference numeral 1 denotes an optical fiber, and although not shown, its surface is normally coated with a primary coating of Noricon resin or other synthetic resin. The optical fiber 1 is usually made of quartz glass material, but in some cases it may be made of a synthetic resin phase.

2 is a two-core fiber unit in which two optical fibers 1 are integrated. The two-core fiber unit 2 is a so-called hand-made type in which the two optical fibers 1 constituting the unit are arranged in parallel without being twisted and covered with a synthetic resin coating 6, and its cross section is oval. , for example 1. IXo,
It is 7m++. Reference numeral 7 is a separation groove for fiber separation formed at a position where the boundary line of both optical fibers 1 crosses the coating 6, that is, on the inner surface of the coating 6, which is convenient for dividing the two-core optical fiber 1. be.

Note that it is also possible to use three or more cores instead of two. In this case, it is a general rule not to twist.

The two-core fiber units 2 are each housed in the groove 5, and with the two-core fiber units 2 housed in the 1III5 in this way, the surface of the spacer 3 is covered with an aluminum vibrator or wrapped with aluminum tape to protect it. Form layer 4.

The present invention can be applied to an optical fiber unit for 0PGW, an optical fiber unit for a composite optical fiber line, and an optical fiber unit for communication cables.

[Zengyo Effect 1) The metal spacer described in No. 1 has a wide groove width and a shallow depth, so it can be manufactured by die drawing and roll forming into a single unit of 1n, and the number of stages to be drawn down can be reduced.

Corresponding to this groove, do not twist the optical fibers (,
Since it is coated as a flat +1 type parallel optical fiber, it is thin and can be accommodated in the shallow part of the groove 5, and the ratio of the groove portion to the spacer is small, so it can be easily accommodated in the shallow part of the groove 5. Even if the outer diameter is made smaller in comparison, substantially the same mechanical strength can be maintained.

Furthermore, since the two-core fiber unit 2 has no twist, it can be easily separated using the separation groove 7! (Thus, connection with other optical fibers is also easy.

As described below-1-, the present invention is based on the clever shape of individual parts.
One combination creates an excellent multi-core optical fiber unit.
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[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. 1...Optical fiber, 2...2-core fiber Unison)・
, 3... Space, 4... Protective layer, 5... Groove, 6
...covering, 7...min.lii groove.

Claims (2)

[Claims] (1) A multi-purpose multilayer device characterized in that a coated hand-hammered parallel optical fiber is housed in the groove of a grooved metal wire spacer having a wide and shallow groove on its surface, and a protective layer is provided thereon. Shinko fiber unit. (2) A multi-core optical fiber unit according to claim 1, characterized in that an optical fiber separation groove is provided on the coating surface of the flat parallel optical fiber.