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In this paper we apply the beam-propagation method (BPM) based on the method of lines1 (MoL) to the three-dimensional analysis of longitudinal-varying waveguide structures by using a two-step propagation algorithm.2 Significant features of the MoL BPM are the inclusion of an inhomogeneous basic medium into the first algorithm step and the use of absorbing boundary conditions.
© 1991 Optical Society of America
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