ANALYSIS OF DISCONTINUITIES IN AN ASYMMETRIC DIELECTRIC SLAB WAVEGUIDE BY COMBINATION OF FINITE AND BOUNDARY ELEMENTS

摘要

Ⅰ.INTRODUCTIONSince an optical waveguide is in general made up of three dielectric layers called cover, film, and substrate, it is very important to analyze discontinuities in an asymmetric planar dielectric waveguide. However, there are few theoretical methods for the solution of the discontinuities. One of the reasons is that the asymmetric waveguide has complicated eigenmodes consisting of guided modes, substrate radiation modes, and substrate-cladding radiation modes. An approach proposed by