In a nonlinear optical waveguide, it is not necessary to use a three‐layered structure as in the case of a linear optical waveguide. Even in a two‐layered structure of linear‐nonlinear configuration, there exists a stable light propagation mode along the interface. It is possible to study the structure by subdividing the nonlinear medium constituting one side of the two‐layer configuration.
This paper studies the behavior of the nonlinear surface propagation wave along the interface of the two‐layered linear‐nonlinear configuration by a numerical solution based on the multisegmentation method for the case where the optical intensity dependence of the nonlinear refractive index of the nonlinear region is positive. There also exists a stable light propagation mode in a linear‐nonlinear multilayered optical waveguide in which the nonlinear medium on one of the two regions is made of a multilayered configuration such as a multiple quantum well. It is shown that this linear‐nonlinear multilayered optical waveguide can be treated globally as a linear‐nonlinear two‐layered structure because the nonlinear multilayered region can be treated as a single‐layered nonlinear medium. Further, it is demonstrated that the behavior of the nonlinear surface wave in a nonlinearlinear‐nonlinear three‐layered structure can also be studied in a manner similar to that for the linear‐nonlinear two‐layered structure.
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