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Discrete gap solitons in modulated waveguide arrays

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Abstract

We analyze the beam propagation in modulated waveguide arrays, which consist of two types of alternating waveguides with different widths. Using effective discrete equations, we identify the presence of the so-called Rowland ghost gap in the linear transmission spectrum, and consider the effect of Kerr-type nonlinear self-action, describing two distinct classes of discrete solitons: (i) conventional discrete solitons, and (ii) discrete gap solitons. We demonstrate that the gap solitons can be efficiently generated by Gaussian input beams; both the soliton velocity and its propagation direction can be controlled by varying the input light intensity.

© 2002 Optical Society of America

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