Abstract

It is shown that use of the effective-index method for a rectangular-core waveguide is equivalent to analysis of a pseudorectangular-core waveguide, the dielectric constant of which is higher in some of the cladding regions than that of the actual waveguide. This explains why the effective-index method gives higher values for the propagation constants for the various guided modes than other methods and different results depending on whether one starts with the longer dimension or the shorter dimension to construct the effective-index waveguide.

© 1988 Optical Society of America

Simple method for analyzing the birefringence of an elliptical-core fiber by an equivalent rectangular waveguide

D. F. Clark and I. Dunlop
Opt. Lett. 14(20) 1149-1151 (1989)

Performance of the effective-index method for the analysis of dielectric waveguides

Kin S. Chiang
Opt. Lett. 16(10) 714-716 (1991)

Dual effective-index method for the analysis of rectangular dielectric waveguides

K. S. Chiang
Appl. Opt. 25(13) 2169-2174 (1986)

Improved two-dimensional beam-propagation method for three-dimensional integrated-optical waveguide structures having rectangular-core cross sections

Thomas Rasmussen, Jørn Hedegaard Povlsen, and Anders Bjarklev
Opt. Lett. 19(15) 1128-1130 (1994)

Analysis of rectangular-core dielectric waveguides: an accurate perturbation approach

Arun Kumar, K. Thyagarajan, and A. K. Ghatak
Opt. Lett. 8(1) 63-65 (1983)