Dynamics of non-uniform breathing solitons of pulses in multimode fibers

Abstract

We investigate the dynamics of non-uniform breathing solitons in multimode fibers modeled by the oscillating nonlinearities. By using the split-step Fourier-transform method to solve the nonlinear Schrödinger equation with the oscillating nonlinear coefficient, the evolution of non-uniform breathing solitons with irregular breathing periods in the multimode fiber is revealed under the action of second-order dispersion. Further, the number and depth of non-uniform breathers can be manipulated by adjusting the power of the pulse and the oscillation frequency of the nonlinear coefficient. Moreover, we also discuss the evolution of breathers under different dispersion conditions. Our study benefits for the better understanding of the complex dynamics of breathing solitons in multimode fibers.