Modal-Matching Analysis of Loss in Bent Graded-Index Optical Slab Waveguides

Maria MIRIANASHVILI  Kazuo ONO  Masashi HOTTA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.2   pp.238-242
Publication Date: 2001/02/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
Keyword: 
graded-index,  bent slab waveguide,  modal-matching method,  conformal mapping,  multilayer approximation,  

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Summary: 
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.