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Proceedings Paper

Finite element analysis of bent graded-index planar dielectric waveguide
Author(s): Xinzhang Wu
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Paper Abstract

Millimeter wave and optical wave integrated circuits have made significant progress recently. However, device development has been limited by a lack of fundamental understanding in many areas. The propagation characteristics including modal solutions of bent dielectric waveguide are in need of basic research. Many methods (including analytical methods and numerical methods) have been utilized for the analysis of this problem; however, they are either approximate or are computationally intensive. [11.[31 In comparison, a new numerical approach based on the finite element method is proposed in this paper. Rigorous functional expression that include the gradient index is derived from Maxwell's equations in local bent coordinate system. After the finite element discretization of the local field, the generalized algebatic eigenvalue problem is obtained by the variational approach; and then, the eigenvalues and eigenfunctions of the bent dielectric waveguide can be obtained. Fig.1 shows the bent graded-index dielectric waveguide in the local bent coordinate system (x,y,$). We assume that the electromagnetic fields are invariant in the y direction, thus TE modes and TM modes can be considered independently in the structure. The solutions of the eigenmodes can be obtained from the following scalar wave equation

Paper Details

Date Published: 1 January 1994
PDF: 2 pages
Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 225045 (1 January 1994); doi: 10.1117/12.2303166
Show Author Affiliations
Xinzhang Wu, Univ. of Science and Technology of China (China)

Published in SPIE Proceedings Vol. 2250:
International Conference on Millimeter and Submillimeter Waves and Applications 1994
Mohammed N. Afsar, Editor(s)

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