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Modal-Matching Analysis of Loss in Bent Graded-Index Optical Slab Waveguides
Maria MIRIANASHVILI Kazuo ONO Masashi HOTTA
IEICE TRANSACTIONS on Electronics
Publication Date: 2001/02/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
graded-index, bent slab waveguide, modal-matching method, conformal mapping, multilayer approximation,
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Loss analysis in bent graded-index optical slab waveguides is given using the modal-matching method. The conformal mapping replaces curved structure by an equivalent straight waveguide with a modified index profile. For this planar waveguide structure, the normal modes are calculated using a multilayer approximation method. The wave incident on the bend is expanded initially into a finite set of normal modes of the equivalent straight structure, and the transverse fields are matched across the junction. The numerical results show the loss formation in the graded-index waveguides and its dependence of the effective index of the corresponding straight waveguide.