Optical fiber unit and optical fiber cable

A technology of optical fiber unit and optical fiber bundle, applied in optical components, optics, light guide, etc., can solve the problem of fiber core wire breakage, etc., and achieve the effect of restraining twist

Inactive Publication Date: 2018-11-23
FUJIKURA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the splicing part of the bundle that stands up in this way is caught in other optical fiber bundles, etc., there is a possibility that the optical fiber core wire may be disconnected.

Method used

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  • Optical fiber unit and optical fiber cable
  • Optical fiber unit and optical fiber cable
  • Optical fiber unit and optical fiber cable

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0052] (Evaluation of entanglement characteristics caused by binding parts)

[0053] The entanglement of the optical fiber at the junction of the binders 10 is caused by the erection of the junction of the binders when the width W to the thickness T of the binder is equal to or greater than a certain value. Therefore, a plurality of trial-manufactured optical fiber units were manufactured with respect to the cross-sectional dimensions of the binder, and the evaluation of the entanglement characteristics at the junction between the binders 10 was performed.

[0054] First, a plurality of trial-manufactured optical fiber units assembled 80 optical fiber core wires and wound the bundle into an SZ shape. The winding method of the bundle and Figure 1B and Figure 5 Same as shown. A plurality of trial optical fiber units were manufactured with different widths and thicknesses, and when they were rotated and brought into contact with other optical fiber units, it was evaluated wh...

no. 2 approach

[0062]

[0063] In the above reference example, when the optical fiber unit is bent, the optical fiber core wires protrude from the gap enclosed by the binding members. The protruding portion of the optical fiber core is caught in other optical fiber units or bundles, and is locally bent, resulting in an increase in transmission loss and breakage of the optical fiber core.

[0064] Figure 8 It is a figure for explaining the optical fiber unit 2 in which the optical fiber core wire 8 protrudes. in addition, Figure 8 For ease of description, only one of the binding members 10 is shown in the figure, and the other binding members 10 joined thereto are not shown. In the following description, a suffix (A, B) will be added to the optical fiber core wire 8 for description. like Figure 8 As shown, when a bend is applied to the optical fiber unit 2 , a difference in line length occurs between the trajectories of the optical fiber core wire 8 from the point S to the point E. ...

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Abstract

The invention provides an optical fiber unit and an optical fiber cable. When bundle materials having a width greater than the thickness in cross-section are wound around an optical fiber bundle in anSZ shape, twisting occurs in the bundle materials at locations at which the winding direction is inverted, and the bundle materials become joined in a shape of being upright from the optical fiber bundle. The present disclosure is an optical fiber unit provided with an optical fiber bundle in which a plurality of optical fiber core wires are bundled, and a plurality of bundle materials. One of the plurality of bundle materials is wound on the outer periphery of the optical fiber bundle along the longitudinal direction of the optical fiber bundle while alternately inverting the winding direction, and joined to another bundle material at locations at which the winding direction is inverted. The width of the bundle material is less than 20 times the thickness of the bundle material in cross-section.

Description

technical field [0001] The present invention relates to an optical fiber unit and an optical fiber cable. Background technique [0002] A technique is known in which an optical fiber cable is constituted by an aggregate of optical fibers bundled together with a plurality of optical fiber cores as an optical fiber unit. At this time, a general method is to wind a thick coil (bundle) around the optical fiber core bundle to suppress scattering of the optical fiber core bundle, and to identify the optical fiber unit by the color of the binder. [0003] Regarding such a binding piece, in Patent Document 1, particularly Figure 7 discloses that when two bundles are used to bundle around a plurality of optical fiber core wire bundles, the two bundles are wound into an SZ shape, and the technology of bonding and fixing the two bundles at the reverse position of the winding direction is disclosed. In addition, Patent Document 2 discloses that there are three or more binding members ...

Claims

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Application Information

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IPC IPC(8): G02B6/44
CPCG02B6/441G02B6/4433G02B6/44G02B6/4403G02B6/443
Inventor 伊藤直人大里健山中正义
Owner FUJIKURA LTD
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