Abstract

The effect of a thin adsorbed layer of a foreign material on the modal propagation constant in an optical fiber is calculated by the use of a time-independent perturbation theory. The effect is measured on a straight fiber but is enhanced on a bent fiber because of tunneling, which is analogous to the Zener effect in quantum mechanics. Experimental results obtained with a fiber interferometer are presented.

© 1995 Optical Society of America

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