Abstract

Scattering of guided modes from an abruptly terminated waveguide is analyzed through an integral-equation formulation. First the boundary-value problem for a plane-stratified waveguide with arbitrary profile is reduced to a canonical system of surface integral equations. A Born-type iterative procedure is then employed to obtain a tractable solution of the scattering field at the termination. The specific choice of a tilted planar termination renders an explicit closed-form expression for the first Born approximation, represented by the plane-wave spectrum of the incident modal field modified by the appropriate Fresnel coefficient. Thus previous ad hoc formulations can be recovered as limiting cases of the suggested rigorous expansion scheme.

© 1988 Optical Society of America

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