A transition from a symmetric to an asymmetric waveguide can serve as a mode- and polarization-dependent light-wave coupler. Coupling experiments with an efficiency up to 70% are reported. Furthermore, total reflection occurs at the transition if the angle of incidence of the guided wave exceeds a critical value. Coupling and total reflection are explained, using the concept of the effective refractive index.
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W. Sohler (1973) studied this question.
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