M-typed dark soliton generation in optical fibers

In this paper, the analytic dark soliton solution for the nonlinear Schrodinger equation with variable coefficients is investigated with the aid of the bilinear method. M-type dark solitons are demonstrated by analyzing relevant parameters in the obtained solution. The influence of parameters on dark soliton transmission is discussed, and the stable transmission of M-type dark solitons in optical fibers is realized. Results of this paper have certain theoretical significance for the stable transmission of optical solitons in actual optical fiber links.