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Eduard N. Tsoy, Izzat M. Allayarov, and Fatkhulla Kh. Abdullaev, Stable localized modes in asymmetric waveguides with gain and loss, July 15, 2014 / Vol. 39, No. 14 / OPTICS LETTERS

It is shown that asymmetric waveguides with gain and loss can support a stable propagation of optical beams. This means that the propagation constants of modes of the corresponding complex optical potential are real. A class of such waveguides is found from a relation between two spectral problems. A particular example of an asymmetric waveguide, described by the hyperbolic functions, is analyzed. The existence and stability of linear modes and of continuous families of nonlinear modes are demonstrated.



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