Gel-swellable layers on fibers, fiber ribbons and buffer tubes

Details Gel-swellable layers on fibers, fiber ribbons and buffer tubes Gel-swellable layers on fibers, fiber ribbons and buffer tubes

2005-09-20

2005-09-20

Healy, Brian M. (Department: 2883)

Optical waveguides

Optical transmission cable

Loose tube type

C385S100000, C385S114000, C385S141000

Reexamination Certificate

active

06947648

ABSTRACT:
The present invention adds a gel-swellable layer in fiber optic cables to aid in protecting the fibers within the cable. The gel-swellable layer can be placed on the fibers, individual ribbons, stacks of ribbons and on the inner surface of tubes by various methods, such as co-extrusion, and can be cured by either heat curing or UV curing. The gel-swellable layers of this invention can be either smooth or textured. When the fibers are placed into the tubes and the tubes are filled with the water resistant gel, the gel-swellable layer absorbs some of the gel causing it to “swell”. As a result of the “swelling” a certain volume of gel is absorbed by the layer, thus reducing the capability of the gel to flow at elevated temperatures.

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