Inelastic interaction between dark solitons for fourth-order variable-coefficient nonlinear Schrödinger equation

Dark solitons have the advantages of high stability, long transmission distance, and low time jitter, they can be used in the field of high precision measurement, optical communication, and nonlinear optics. In this paper, inelastic interactions between dark solitons are investigated. With the analytic dark soliton solutions for the fourth-order variable-coefficient nonlinear Schrodinger equation, various types of inelastic interactions between dark solitons are presented. Influences of corresponding parameters are analyzed. Results may be applied in the optical switching devices and design of logic gates.