Abstract
In fiber optic devices, the 250 to 400-μm-diameter tight jacketed fibers are sometimes jacketed additionally by loose tube-type materials. However, the loose tube jacketed fibers fail possibly due to the shrinkage of the loose tubes, if the tubes are not stabilized enough by preheat aging, etc. Although such phenomena are empirically known, here when the loose tube shrinks, the inner fiber is found to relax by being helically deformed. As a result, commercial fibers could endure at least 1–1.5% longitudinal shrink without a mechanical break, but exhibited excess optical propagation losses due to the bending.
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