Cubic-quartic solitons in birefringent fibers with Kundu–Eckhaus equation using two integration schemes

Abstract

In this paper, we deduce the soliton solutions of the Kundu–Eckhaus equation in birefringent fibers. The addendum to Kudryashov’s method and the modified Kudryashov’s method have been used. The combo bright-singular soliton, dark soliton, bright soliton and the singular soliton solutions are existed under constraint conditions.