Abstract

A simple accurate perturbation analysis is presented to calculate the attenuation of guided modes in metal-clad or weakly absorptive multilayer waveguides. The imaginary part of the complexmodal index that defines the attenuation is obtained from simple algebraic calculations once the real solution corresponding to a real eigenvalue equation is obtained. The results are in agreement with those obtained by an exact complex analysis.

© 1992 Optical Society of America

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