Abstract
I introduce the fundamental idea of the equivalent-current theory of optical waveguide coupling proposed in previous papers [ J. Chin. Inst. Commun.1982( 3), 1 ( 1982); Sci. Sin. A26, 894 ( 1983); Sci. Sin. A27, 1217 ( 1984)] and apply this theory to the derivation of the general optical waveguide coupling equations and the analyses of a grating coupler and a metal-clad optical waveguide. The results show that this theory can be used systematically to analyze a series of optical waveguide problems that were previously solved by quite different theories (or analytical methods). I also show that this theory can be used to obtain many new results that are difficult to obtain by other analytical methods published before.
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