Sheathed optical fiber cable

Details Sheathed optical fiber cable Sheathed optical fiber cable

1981-09-21

1989-08-22

Sikes, William L.

G02B 644

Patent

active

048590231

ABSTRACT:
Optical fiber cables have an inner sheath extruded or otherwise applied to surround optical fibers. If the fibers are coupled to the sheath, substantial shrinkage of the sheath during manufacturing induces microbending losses in the optical fibers. The inventive technique involves choosing a sheath material having a low viscoelastic modulus, typically PVC, and the application of tension thereto during or after extrusion that prevents such shrinkage. This approach typically avoids the necessity of including longitudinal compressive strength members in the cable. A filled optical fiber cable having a flexible gel to prevent water entry advantageously uses the present technique.

REFERENCES:
patent: 4078853 (1978-03-01), Kempf
patent: 4141623 (1979-02-01), Dubost et al.
patent: 4241979 (1980-12-01), Gagen et al.
patent: 4259540 (1981-03-01), Sabia
Characteristics of Jelly-Filled Optical Cables; H. Horima et al; Journal of Optical Communication; 1980; pp. 58-63.
Microbending Loss in Optical Fibers; W. B. Gardner; The Bell System Technical Journal; vol. 54, No. 2; Feb. '75; pp. 457-465.

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