EQUIVALENT WAVE-GUIDE MODEL FOR PARABOLIC INDEX PLANAR SEGMENTED WAVE-GUIDES

In this paper we outline a simple procedure to obtain an equivalent z- invariant waveguide for a given graded index segmented waveguide, In p articular, the proposed model is shown to predict accurately the modal spot size and the effective indices of the fundamental and the first higher order modes of a planar parabolic-index segmented waveguide ove r the entire range of duty cycles. The result should be useful in simp lifying the analysis of general graded index segmented waveguides.