Nonlinearity- and Dispersion-Managed Solitons in Optical Fiber Systems

On the basis of the variational approach, this paper examines the dynamics of a pulse in fibers with periodic dispersion and nonlinearity. With this approach, a set of couple different equations for the evolution of the pulse width and chirp are obtained. We annalyse the propagation of dispersion and nonlinearity-managed solitons. The result demonstrates that compared with only dispersion management, a dispersion and nonlinearity-managed soliton can propagate with higher quality. Significantly, when the propagation distance increases, the pulse width almost remains unchangeable.