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Impedance boundary method of moments for accurate and efficient analysis of planar graded-index optical waveguides

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1 Author(s)
Weisshaar, A. ; Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA

An impedance boundary method of moments (IBMOM) is proposed to accurately and efficiently compute the propagation characteristics including the number of guided modes of general graded-index dielectric slab waveguide structures. The method is based on Galerkin's procedure in the method of moments and employs the exact impedance boundary condition at the interfaces between the graded-index region and constant-index cladding. Legendre polynomials are utilized in the field expansion. Computational results are shown for waveguides with various inhomogeneous refractive index profiles. The results indicate that typically five Legendre polynomials are sufficient for accurate solutions of the dominant TE and TM modes in optical waveguides having a finite region of inhomogeneous refractive index. Diffused optical waveguides with untruncated index profiles as well as coupled dielectric waveguides can be accurately analyzed using ten Legendre polynomials

Published in:

Lightwave Technology, Journal of  (Volume:12 ,  Issue: 11 )

Date of Publication:

Nov 1994

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