Abstract

We present a detailed perturbation analysis of the recently proposed polarization splitting directional coupler configuration consisting of two interacting optical waveguides with a thin layer of metal between the two waveguides. We have carried out numerical calculations of extinction ratios by the approximate perturbation method and compared the results with those obtained by a more rigorous matrix method developed earlier by A. K. Ghatak, et al., IEEE/OSA J. Lightwave Technol. LT-5, 660 ( 1987). We also studied the tolerances required for the device. We carried out calculations for gold and aluminum and have shown that the proposed device has extinction ratios of about −22 dB for gold and −31 dB for aluminum.

© 1989 Optical Society of America

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