Optical fiber cable

Details Optical fiber cable Optical fiber cable

1990-07-20

1992-01-21

Lee, John D.

Optical waveguides

Optical transmission cable

Loose tube type

385113, G02B 644

Patent

active

050823485

ABSTRACT:
An optical fiber cable (20) includes a core (21) comprising a plurality of optical fibers (24--24) without intended stranding. The plurality of optical fibers are enclosed in a common tube (34) which provides a predetermined packing density and which is substantially parallel to the longitudinal axis of the cable. In one embodiment, a waterblocking material (36) is disposed within the tube to fill the interstices between the optical fibers and between the fibers and the tube. The waterblocking material is such that its critical yield stress does not exceed about 70 Pa at 20.degree. C. and such that it has a shear modulus of less than about 13 KPa at 20.degree. C. The common tube is enclosed with non-metallic or metallic strength members and a plastic inner jacket and by another layer of strength members and by a plastic outer jacket. This arrangement is such that the cable may be manufactured and installed with optical fibers capable of moving within the cable structure to prevent undue stresses being imparted thereto which would cause unwanted microbending losses.

REFERENCES:
patent: 1987442 (1935-01-01), Harris
patent: 4172106 (1979-10-01), Lewis
patent: 4342500 (1982-08-01), Oestreich et al.
patent: 4370023 (1983-01-01), Lange et al.
patent: 4446686 (1984-05-01), Panuska et al.
patent: 4464013 (1984-08-01), Sabia
patent: 4509821 (1985-04-01), Stenger
patent: 4557560 (1985-12-01), Bohannon, Jr. et al.
patent: 4826278 (1989-06-01), Gartside, III et al.
patent: 4971419 (1990-11-01), Gartside et al.
Wireless World Article, vol. 82, No. 1488, Aug. 1976.

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