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Reflectivity analysis of optical waveguides with coated and tilted facets using the FD-TD method with the PML absorbing boundary condition

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Abstract

Considerable attention has been paid to reflection problems at the facets of optical waveguides [l]-[3]. Recently, the finite-difference time-domain (FD-TD) method was used to analyze optical waveguides with an antireflection (AR) coating[4][5]. The numerical modeling has an advantage of applicability to arbitrary structures with sufficient accuracy. It should be noted, however, that the performance of the absorbing boundary condition (ABC) used with the FD-TD method determines the dynamic range of the numerical simulation. Widening the dynamic range is crucial to the evaluation of low power reflectivities, particularly for a tilted AR coating.

© 1996 Optical Society of America

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