1999/04/06 by Jongbae Kim, Q-Han Park, H. J. Shin · 1 citation
Physics and Astronomy · #solv-int #nlin.SI
paper · pdf · doi:10.1103/physreve.58.6746
published as Phys. Rev. E {\bf 58} 6746, 1998
arxiv created 1999/04/06 · arxiv updated 2009/11/30
Conservation laws of the nonlinear Schrödinger equation are studied in the presence of higher-order nonlinear optical effects including the third-order dispersion and the self-steepening. In a context of group theory, we derive a general expression for infinitely many conserved currents and charges of the coupled higher-order nonlinear Schrödinger equation. The first few currents and charges are also presented explicitly. Due to the higher-order effects, conservation laws of the nonlinear Schrödinger equation are violated in general. The differences between the types of the conserved currents for the Hirota and the Sasa-Satsuma equations imply that the higher-order terms determine the inherent types of conserved quantities for each integrable cases of the higher-order nonlinear Schrödinger equation.