Since the large flaws which control the strength of long lengths of fiber occur infrequently, such flaws are unlikely to occur in short test lengths. This has raised questions about the validity of mechanical reliability predictions based on tests of high-strength fibers. Proof-testing is an effective technique for eliminating some of these defects and assures the long-term mechanical reliability of optical fibers.1 Nevertheless, a few flaws remain in the fibers which barely pass proof stress, but they can result in strength reduction due to static fatigue. In an attempt to understand the behavior of fibers containing large flaws, we have produced fiber that contains many flaws by introducing an abrasive material into the coating material.2,3

© 1989 Optical Society of America

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