Optical fiber cable and methods of making

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

G - Physics

02

B

88/97

G02B 6/44 (2006.01)

Patent

CA 1283314

OPTICAL FIBER CABLE AND METHODS OF MAKING Abstract An optical fiber cable (20) includes a core (21) comprising plurality of units (22-22). Each unit is formed by a plurality of optical fibers (24-24) which are assembled together without intended stranding. The plurality of units 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 units. The waterblocking material is such that its critical yield stress does not exceed about 70 Pa at 20°C and such that it has a shear modulus of less thann about 13 KPa at 20°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 the optical fibers capable of moving within the cable structure to prevent undue stresses being imparted thereto which would cause unwanted microbending losses. (FIG. 1).

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