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US 4,792,422 AGranted
Method of making an optical fiber cable
AssigneeEricsson Inc.
InventorsKenneth E. Cornelison, Michael E. McGuire
Life of this patent
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Abstract
Single mode optical fiber cable with a plurality of buffer tubes wherein the buffer tubes each encase a plurality of single mode optical fibers, the fibers run in a random pattern through the buffer tube and the remaining space is filled with soft filler material which prevents the ingress of moisture while allowing free movement of the fibers within the tubes, the fibers all have equal overlength.
Claims9
The method of making optical fiber cables with fibers of equal length comprising:
- (a) pulling a plurality of single mode optical fibers under equal stress such that any elongation thereof is equal for each fiber;
- (b) loosely encasing equal overlengths of fibers in random relation to each other in an extruded buffer tube;
- and
- (c) filling the buffer tube with soft filler material.
1 more element
A method for assembling optical fibers in a buffer tube that is used to make an optical fiber cable, comprising the steps of:
- passing plural optical fibers in a spaced, parallel fashion into frictional engagement with a capstan with equal tension in each fiber to thereby maintain uniform overall lengths of fibers;
- gathering the fibers into a random pattern after they have passed over the capstan;
- extruding a buffer tube around the gathered fibers;
- and
- injecting a filling material into the buffer tube as it is being extruded.
2 more elements
Dependencies are inferred from the claim text.