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It is shown that stable, large amplitude, spatially coherent solutions of the nonlinear Schr\"odinger equation can be excited by a weak forcing composed of an oscillation and a standing wave with a slowly varying frequency. The excitation involves autoresonant transition from a growing amplitude, uniform state to spatially modulated solution approaching the soliton, as the frequency increases in time.
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Frièdland et al. (1998) studied this question.
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