Abstract
A finite-difference scheme for accurately analyzing step-index
dielectric waveguides with angled and curved dielectric interfaces has been
proposed by Chiang Here, this formulation is generalized to take into
account a possible curvature of the entire waveguide along the propagation
direction, and it is shown how Perfectly Matched Layers can be incorporated
in order to accurately compute the bending or curvature loss of dielectric
waveguides with step-index profiles of arbitrary shape. Furthermore, the formulation
of the interface equations that relate the fields and their derivatives on
both sides of a dielectric interface has been simplified, so that their implementation
no longer requires any further explicit conversions between coordinate systems.
© 2011 IEEE
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