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Coupled-Mode Analysis of an NRD-Guide Coupler Based on Singular Perturbation Technique

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Abstract

A coupled-mode formulation for an NRD-guide coupler is presented using the singular perturbation technique. The first-order and second-order perturbations are taken into account in the analysis and the coupled-mode equations based on the eigenmodes of each waveguide in isolation are derived. The propagation constants obtained by these equations are compared with those by the exact theory, conventional coupled-mode theory, and improved coupled-mode theory. The numerical results of present formulation are in good agreement with the exact theory and superior to those of the other formulations.

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Authors and Affiliations

  1. Department of Computer Science and Communication Engineering, Kyushu University, Fukuoka, 812-8581, Japan

    Koki Watanabe & Kiyotoshi Yasumoto

Authors
  1. Koki Watanabe
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  2. Kiyotoshi Yasumoto
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Watanabe, K., Yasumoto, K. Coupled-Mode Analysis of an NRD-Guide Coupler Based on Singular Perturbation Technique. International Journal of Infrared and Millimeter Waves 20, 2163–2174 (1999). https://doi.org/10.1023/A:1022659424499

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  • DOI: https://doi.org/10.1023/A:1022659424499

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