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Optical time-domain reflectometry of bent plastic optical fibers

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Abstract

Optical time-domain reflectometry (OTDR) signals of step-index plastic optical fibers (POF’s) and graded-index POF’s were measured with a laser diode and an avalanche photodiode. When bent step-index and graded-index POF’s were used, the OTDR signal behavior differed. The OTDR signal of the bent graded-index POF’s had a step that corresponds to a curvature loss, but the step-index POF’s had a spike signal at a bend, which indicated the occurrence of backscattering. The peak intensity was proportional to the square of the curvature. The refractive-index variation of the bent step-index POF’s was measured, and the dependence of the peak intensity on the curvature was shown to agree with that predicted by the scattering from the refractive-index perturbation.

© 2001 Optical Society of America

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