Abstract
AbstractThis paper presents a new coupled‐mode theory by extending Chuang's theory to include the radiation modes. The effectiveness of this theory is demonstrated via numerical analysis.The coupling equations are derived following a procedure similar to Chuang's and the radiation modes are included in it. The coupling equations are simplified by neglecting the terms which represent the coupling between the radiation modes because their contribution is insignificant.In the numerical analysis, the radiation modes are treated in isolation and the coupling between them is neglected. The model for the numerical analysis is that of a symmetrical and asymmetrical optical slab waveguide. The light intensity distribution inside the guide is investigated numerically and the results are compared with those by Chuang's theory.As the result of analysis, it is shown that due to excitation of radiation modes near the input/output end, the coupling length estimated by the present theory is longer than that by Chuang's theory. Moreover, the light intensity distribution has been extended.
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