Numerical Simulation Study Of Optical Rogue Wave In Optical Fiber

Rogue wave (freak wave) origins from oceanography, it is an extremely destructive and a very complicated nonlinear phenomenon in nature, and has become the hot topic in the field of nonlinear fiber optics as well as optical soliton. Despite more and more scientists have devoted to the investigations of rogue wave, and some great achievements have been made, there is still not unified conclusion about its formation mechanism nowadays, most recently, rogue wave. Studying the formation mechanism of optical rogue wave, on one hand, makes us a better understanding of this mysterious natural phenomena, even enable us to avoid the oceanic disasters and reduce loss; on the other hand, rogue wave is just likes a double-edged sword, which is considered to be controllable easily in optic systems, and it can be generated and suppressed according our needs, so in terms of studying optical rogue wave, it possesses a excellent performance.In this paper, firstly, we propose a one-dimension extended system with extra-long single mode fibres (SMFs) to study the formation process of optical rogue wave (ORW). Based on coupled nonlinear Schrodinger equations (NLSEs), our simulation results present that ORW can be generated through a single collision between solitons with the assistance of dispersive waves under the condition of continuous-wave (CW) pumping femtosecond pulses. Besides, we obtained its duration time which is less than 4 ns by investigating the evolution of spatial structure. Secondly, in the process of studying formation mechanism of rogue wave, analytical results and numerical simulation based on self-focused NLSE using dressing method obtained good agreement with experimental phenomenon, and we observed bipole superregular soliton appears repeatedly in a way of FPU recurrence behavior experimentally.