Abstract

The effect of formation of asymptotically stable solitary waves (ASSW) in an amplifying dispersive medium with frequency-dependent linear amplification, nonlinear losses, and nonlinear refractive index is predicted. All the parameters of the ASSW are invariants of the medium. The method developed is based on formalism of the Fokker-Planck equation describing a pulse dynamics in the presence of noise. The stability is proved by Lyapunov's method. It was found that the ASSW is described by the Euler-Lagrange equation defined by a minimum of the effective potential being the Lyapunov function. It was found that the bright solitary wave is unstable whereas the dark solitary wave is asymptotically stable.

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