Lax pair and vector semi-rational nonautonomous rogue waves for a coupled time-dependent coefficient fourth-order nonlinear Schr?dinger system in an inhomogeneous optical fiber

• 来源期刊: 中国物理B（英文版）
• 关键词: inhomogeneous optical fiber Lax pair coupled time-dependent coefficient fourth-order nonlinear Schr?dinger system vector semi-rational nonautonomous rogue waves breathers
• 年，卷（期）: 2020,（3）
• 页码范围: 61-68
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab7442

摘要

Optical fibers are seen in the optical sensing and optical fiber communication. Simultaneous propagation of opti-cal pulses in an inhomogeneous optical fiber is described by a coupled time-dependent coefficient fourth-order nonlinear Schr?dinger system, which is discussed in this paper. For such a system, we work out the Lax pair, Darboux transforma-tion, and corresponding vector semi-rational nonautonomous rogue wave solutions. When the group velocity dispersion (GVD) and fourth-order dispersion (FOD) coefficients are the constants, we exhibit the first-and second-order vector semi-rational rogue waves which are composed of the four-petalled rogue waves and eye-shaped breathers. Both the width of the rogue wave along the time axis and temporal separation between the adjacent peaks of the breather decrease with the GVD coefficient or FOD coefficient. With the GVD and FOD coefficients as the linear, cosine, and exponential functions, we re-spectively present the first-and second-order periodic vector semi-rational rogue waves, first-and second-order asymmetry vector semi-rational rogue waves, and interactions between the eye-shaped breathers and the composite rogue waves.