Optical fiber cable and methods of making

Details Optical fiber cable and methods of making Optical fiber cable and methods of making

1989-02-16

1990-11-20

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 7, 57 9, 264 15, 350 9634, G02B 644

Patent

active

049714198

ABSTRACT:
An optical fiber cable (20) includes a core (21) comprising a units a unit (22). The unit is formed by a plurality of optical fibers (24-24) which are assembled together without intended standing. The unit is enclosed in a 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 unit and the tube. The waterblocking material is such that its critical yield 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 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 the 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.
patent: 4836639 (1989-06-01), Shamoto et al.
Wireless World Article, vol. 82, No. 1488, Aug. 1976.

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