Abstract
Interaction as well as dynamics of the dark-bright vector solitons induced by incorporation of gain and two-photon absorption are investigated by the numerical method in a birefringent fiber. The numerical results show that the gain and the two-photon absorption may lead to the destructive effects on the soliton propagation and interaction. Their combined effects play a crucial role in the dynamics and depend strictly on the sign and magnitude of their coefficients, so the proper incorporation may reduce effectively their destructive effects. The nonlinear gain combined with the filter can be used to suppress effectively the disadvantaged effects and the stabilization mechanism is demonstrated.
Highlights
Optical solitons in fibers are formed by a balance of group dispersion and Kerr non-linearity, numerical simulation and experiments have demonstrated solitons can propagate an extended distance without distortion, so they maybe become the ideal message carrier in long distance communication (Hasegawa and Kodama, 1995).There are many perturbations in a practical soliton system, which lead to the fluctuation in amplitude or pulse-width of soliton and deform the soliton shape
-called coupled dark-bright vector soliton, where a bright optical solitary wave exists in a system with defocusing nonlinearity because it is trapped within a co-propagating dark soliton, has some interesting and distinguishing dynamics, which are different from those of the bright soliton and the dark soliton
The perturbations induced by the gain and the two-photon absorption result in the avalanche of the side band, lead to the submergence of the dark vector soliton and the enhance the vector soliton interaction
Summary
Optical solitons in fibers are formed by a balance of group dispersion and Kerr non-linearity, numerical simulation and experiments have demonstrated solitons can propagate an extended distance without distortion, so they maybe become the ideal message carrier in long distance communication (Hasegawa and Kodama, 1995).There are many perturbations in a practical soliton system, which lead to the fluctuation in amplitude or pulse-width of soliton and deform the soliton shape. We can see that the dynamics of the dark-bright vector solitons result from the gain and the two-photon absorption for the soliton propagation, respectively.
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