Abstract

A new interferometric scheme for measuring mode conversion distributed locally along a polarization-maintaining fiber is presented. Using this technique the power coupling coefficient, varying with magnitude and angle of external pressure transversely applied to a fiber, was evaluated both theoretically and experimentally. The coupling point location is determined with ±1.5-cm accuracy and resolution of better than 10 cm for a 220-m long fiber having modal birefringence of 4.4 × 10−4. The coupling coefficient was proportional to the external force in the range from 5 × 10−3 to 0.1 kg/mm. The relationships determined experimentally reflected those predicted by theory.

© 1988 Optical Society of America

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