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Improved coupled-mode theory for high-index-contrast photonic platforms



Qing Li, Gregory Moille, Hossein Taheri, Ali Adibi, Kartik Srinivasan


Coupled-mode theory has been widely used in optics and photonics design. Despite its popularity, several different formulations of coupled-mode theory exist in the literature and their applicable range is not entirely clear, in particular when it comes to high-index- contrast photonics platforms. Here we propose an improved formulation of coupled-mode theory and demonstrate its superior performance through numerical simulations. In particular, application of the improved coupled-mode theory to asymmetric waveguides reveals a necessary correction in the conventional phase matching condition for high-index-contrast materials, which could lead to more accurate photonic circuit designs involving asymmetric elements.
Physical Review A


Li, Q. , Moille, G. , Taheri, H. , Adibi, A. and Srinivasan, K. (2020), Improved coupled-mode theory for high-index-contrast photonic platforms, Physical Review A, [online],, (Accessed April 12, 2024)
Created December 3, 2020, Updated October 12, 2021