Ankiewicz, Adrian; Wang, Yan; Wabnitz, Stefan; Akhmediev, Nail
We consider an extended nonlinear Schrodinger equation with higher-order odd (third order) and even (fourth ¨
order) terms with variable coefficients. The resulting equation has soliton solutions and approximate rogue wave
solutions. We present these solutions up to second order. Moreover, specific constraints on the parameters of
higher-order terms provide integrability of the resulting equation, providing a corresponding Lax pair. Particular
cases of this equation are the Hirota and the...[Show more]
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