JPS58147701A - Pipe type optical fiber core - Google Patents

Abstract

PURPOSE:To spiral easily an optical fiber core, and also to easily manufacture a core having good tension resistance, by storing a high strength covered optical fiber core body and a low strength filament body in a pipe, in a prescribed state. CONSTITUTION:A core 1 has such a structure as a high strength covered optical fiber core body 2 which has a high Young's modulus and is scarcely elongated, and a low strength filament body 3 whose Young's modulus is lower than that of said body are stored in a pipe 4 in a state that the core body 2 is spirally wound around the outside circumference of the filament body. The core body 2 has such a structure as a high strength covered layer 2B such as fiber reinforced plastic is provided on the outside circumference of an optical fiber strand 2A. Accordingly, a virtual linear distance of the core wire body 2 becomes long by a portion by which the core body 2 is elongated as to its spiral pitch and approached a linear shape, and tension can be absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mother-tube type optical fiber core 1sK in which a high-strength coated optical fiber core body is housed in a spiral shape inside the tube.

The optical fiber 6so is weak against tension, and in order to prevent the optical fiber core wire from breaking even if a certain amount of tension is applied, the optical fiber / centripetal wire main body is housed in a spiral shape in the Δ Eve. An arm-if type optical fiber has been proposed. However, such / 肂い! Type optical fiber core, /4
It is technically difficult to house the optical fiber core in a spiral shape at low cost, and although there are various proposals,
No practical solution has been proposed yet.

An object of the present invention is to create a /4-wave type optical fiber coated wire having a structure that can be manufactured easily and practically at low cost.

The 74-Ig type optical fiber core of the present invention has a high-strength coated optical fiber core body having a high Young's modulus and a low-strength filament body having a lower Young's modulus on the outer periphery of the low-strength filament body. It is characterized in that the coated optical fiber core body is housed in the arm id in a helically wound state.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to the drawings showing an embodiment of the present invention. As shown in FIGS. 1 and 2, the optical fiber core I11 of this embodiment is comprised of a high-strength coated optical fiber core body 2 with a high Young's modulus and low elongation, and a low Shang modulus. The low-strength filament 3 has a structure in which a high-strength coated optical fiber core body 2 is spirally wound around the outer periphery of the low-strength filament 3 and housed in a pipe 4 in good condition. Ru. The high-strength coated optical fiber core body 2 has a structure in which a high-strength coat layer 2B such as fiber-reinforced glass is provided around the outer periphery of the two optical fibers. High strength coating layer 2B
For example, the outer periphery of the optical fiber 2A is coated with plus fibers longitudinally attached and the outer periphery is coated with a thermosetting resin such as ester, or coated with a metal layer. In this example, the low-strength filament 3 is made of ester or nylon.

A material such as Teflon is used. When the Δ-ib type low-strength linear body 3 is used in this manner, the tensile strength and the amount of deformation in response to lateral pressure can be changed by changing the d-ib thickness. Alternatively, the low-strength filament 3 may be a solid rod made of silicone resin or the like. No. 4 is formed of metal, plastic, glue, or the like. The state in which the high-strength overlapping optical fiber core body 2 is spirally wound around the outer periphery of the low-strength filament 3 can be easily achieved by twisting or winding.

Assuming that such a z4 ide type optical fiber/4-fiber wire l has elongation-pull tension characteristics as shown in Fig. 5 and strain-crush charge characteristics as shown in Fig. 6, the tension is When the action occurs, the low-strength filament 3 is crushed as shown in FIGS. 3 and 4, and the high-strength coated optical fiber core body 2 is crushed.
After being stretched out, the high-strength coated optical fiber core body 2 is
It approaches the center of Eve 4 in a straight line, and the low-intensity striatum 3
is in a spiral shape around the outer periphery of the high-strength coated optical fiber core body 2.

As described above, the appearance of the high-strength coated optical fiber coated wire body 2, which has a spiral shape and is given an extra length, is increased by increasing the spiral pitch and approaching a straight line. The straight line distance at the top becomes longer and the tension can be absorbed. Therefore, by assembling such F-type optical fiber cores with other optical cable components, it is possible to construct an optical couple that can tolerate large elongation.

As explained above, in the arm-shaped optical fiber core according to the present invention, the high-strength coated fiber core body with a high Young's modulus and the low-strength filament with a low shang modulus are combined into a low-strength wire. Since the high-strength prioritized fiber core body is not spirally wound around the outer periphery of the strip and is housed in the 9 Ig, it is easy to apply a spiral shape to the high-strength coated optical fiber core. The shape can be easily maintained. Therefore, according to the present invention, it is possible to practically and easily manufacture an optical fiber coated wire having excellent tensile strength performance at low cost.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views and vertical cross-sectional views showing an embodiment of the /4-shaped optical fiber according to the present invention, and FIGS. 3 and 4 are /4-shaped optical fibers according to the present invention. A cross-sectional view and a vertical cross-sectional view in a state where tension is applied to the optical fiber wire, and FIGS. 5 and 6 show the elongation/tensile force characteristic diagram and strain instantaneous of the Nonoib type optical fiber core wire of this example. - It is a crush charge characteristic diagram. l...Mother Ig-type optical fiber core, 2...High-strength coated optical fiber core body, 2A...Optical fiber paddle wire,
2B... High-strength coating layer, 3... Low-strength striatum. 2

Claims (1)

[Claims] A high-strength coated optical fiber core body having a high Young's modulus and a low-strength filament body having a low Shang modulus are arranged such that the high-strength coated optical fiber core body is spirally wound around the outer periphery of the low-strength filament body. A /4 type optical fiber core wire, characterized in that it is attached and housed in a /give in a state of mourning.