Sheathed optical fiber cable

Details Sheathed optical fiber cable Sheathed optical fiber cable

G - Physics

02

B

26/197, 88/97

G02B 1/00 (2006.01) G02B 6/44 (2006.01)

Patent

CA 1189367

- 17 - SHEATHED OPTICAL FIBER CABLE 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.

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