An important characteristic of linear stress-induced birefringent fibers is the extinction ratio of cross-polarization, which is defined as the ratio of power leakage into the unexcited mode to that of the total input power. The fundamental limits of cross-polarization in polarization-maintaining (PM) fibers have been described as intrinsic1-3 or internal, extrinsic,4 or external and measurement related.5 Extinction ratio measurements are reported on two lengths (1 and 100 m) of an AT&T rectangular PM fiber6 and compared to published cross-polarization coupling limitations.

© 1988 Optical Society of America

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