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We study on rational solutions on nonzero background of coupled Sasa-Satsumaequations through Darboux transformation method, which take into account thirdorder dispersion, the term with self-frequency shift, and the term describingself-steepening corrections to the cubic nonlinearity. We find there are somenew types of localized waves in the coupled system, such as dark-antidarksoliton pair, W-shaped soliton, dark W-shaped soliton, and the combinedlocalized waves of them. The results indicate that there are abundant novellocalized waves in the two-mode fiber with these high-order effects, whichwould inspire experimental realization in the related physical systems.

Novel Localized Waves in a Two-mode Nonlinear Fiber with High-order Effects