JPS58102906A - Multicored optical fiber core - Google Patents

Abstract

PURPOSE:To improve the bending characteristics of a multicored optical fiber core, by filling a viscous liquid buffer between a stranded layer of optical fiber elements surrounding a tension member and a plastic coated layer at the outermost circumference in order to improve the sliding properties between the fiber elements and the buffer. CONSTITUTION:Plural optical fiber elements 14 containing silicone coated layers 20 are stranded around a tension member 12 made of steel. A plastic coated layer 18 is formed at the outermost circumference, and the silicone oil 16 is filled as a viscous liquid buffer between the stranded layer of the elements 14 and the layer 18. As a result, the sliding properties can be improved between the elements 14 and the oil 16. This can improve the bending characteristics and reduces the extension strain of the optical fiber elements to increase the lifetime of an optical cable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvement of a multi-core optical fiber for optical cables. Recently, a plurality of optical 7-eye fibers have been used around a tensilon member as a multi-core optical fiber. It has been proposed that the outer periphery of the twisted layer of optical fibers is filled with silicon and then baked to form a cushioning material with a substantially circular cross section, and a plastic coating layer is provided on top of this cushioning material. (Refer to Japanese Unexamined Patent Application Publication No. 5Ho#). However, in the multi-core optical fiber core wire of this structure, the optical fiber material and the cushioning material are in close contact with each other, and the slippage between them is poor. When bending is applied to the IPA core wire, the bending of the optical fiber strands on the inside is not relaxed and a large stress is applied to the optical fiber, resulting in large transmission losses. There is a drawback that the elongation strain of the optical fiber cable is not alleviated and the life of the optical fiber wire is shortened.The object of the present invention is to improve the bending properties, alleviate the elongation strain, and extend the life. It is an object of the present invention to provide a multi-core optical fiber that can be used.

Embodiments of the present invention will be described in detail with reference to the drawings.
The drawing shows a multi-core optical fiber core @10 according to the present invention. It consists of a viscous liquid cushioning material 16 such as silicone oil, which is provided around the outer periphery of a composite layer of a base 1114 and a stranded optical fiber, and a plastic coating layer 18 applied on top of this viscous liquid cushioning material.

The optical fiber wire 14 has a silicone coating layer on the outer periphery of the optical fiber 14. The plastic coating layer 18 is made of a plastic pipe, and the viscous liquid buffer material 16, which is silicone oil, is attached to the tension member 12 inside the plastic pipe. After inserting the stranded wire with the optical fiber 14, it is filled into the plastic pipe.In this way, when a viscous liquid is used as the buffer material, the optical fiber 14 and the buffer material come into close contact. Since slippage occurs between the two without any friction, the multi-core optical 7-aipa core $ 10 K II
No mn stress is applied to the optical fiber 14 even if I bending is applied.According to the present invention, as described above, the optical fiber and the buffer material do not come into close contact with each other and slip occurs. Significantly improves the bending properties of multi-core optical fiber,
Since the elongation strain of the Kuko 7 Aipa wire is alleviated, it is possible to prevent life deterioration.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of a multi-core optical 7-iper fiber wire according to the present invention. 10-----One multi-core optical 7-iper fiber wire, 12---One tensile four member, 14----One optical fiber bare wire, 16
----Liquid cushioning material, 18---Plastic coating layer. Patent Applicant Agent Patent Attorney Arata Kikuchi - Father? 0

Claims (1)

[Claims] nine or more optical fibers twisted around a tensilon member, a viscous liquid cushioning material filled in the outer periphery of a twisted layer of the optical fiber strands, and a layer above the viscous liquid cushioning material.
1. A multi-core optical fiber comprising: 1 and 9 plastic surrounding layers.