Abstract
Wave coupling in the coupling section of a dielectric optical waveguide is discussed using even- and odd-mode analysis. The dispersion relations of different modes were obtained by solving Maxwell equations. The two-dimensional finite-difference in time-domain method was implemented to solve these equations. The even and odd modes were characterized by applying different excitation sources. A large number of time steps were taken to reveal the fine structure of the propagation modes. The propagation constants of these modes at the coupling frequency were calculated, and the optical-coupling length was determined. The result is in good agreement with those obtained by the Marcatili method. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 26: 234–237, 2000.
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