Optical cables

Details Optical cables Optical cables

1981-10-09

1984-10-02

Lee, John D.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

57 9, 264 15, 425392, G02B 516

Patent

active

044744269

ABSTRACT:
In a known optical cable, optical fibers are loosely laid in a number of grooves formed within an elongate plastics extrusion. Typically the grooves follow a helical path with periodically reversing pitch, the helices centered on a central longitudinal axis of the cable. A primary reason for the helical lay is to prevent the fibers from becoming stressed should a bend occur in the cable. A further benefit of loose laying of fibers in a helical groove of periodically reversing pitch is that any elongation of the cable core is not immediately transmitted to the fiber supported by it. The fiber will move from its initial loose laid position both in a direction towards the inside curve of the helix and in a direction towards the base of the grooves. When it bears against the cable core over an appreciable length, the fiber will then be subjected to tensile stress. By the invention, tolerance to core elongation is increased by arranging that the grooves at any point along the core cant towards the outside curve of the helix.

REFERENCES:
patent: 4154049 (1979-05-01), King et al.
patent: 4155963 (1979-05-01), De Vecchis et al.
patent: 4191448 (1980-03-01), Dean et al.
patent: 4205899 (1980-06-01), King et al.
patent: 4354732 (1982-10-01), Arnaud et al.

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