负折射介质中可控自陡峭效应对孤子传输的影响

研究了具有非线性极化的负折射介质中孤子脉冲的传输特性,着重分析了在常规非线性传输模型中不曾出现的由负折射介质色散磁导率导致的可控自陡峭效应对孤子传输的影响.结果表明,与正自陡峭效应一样,负自陡峭效应同样造成孤子脉冲的非对称、中心偏移和高阶孤子衰减,但脉冲偏移的方向与正自陡峭效应情形相反.此外,利用可控自陡峭效应可以从某种程度上抵消三阶色散效应导致的孤子脉冲偏移,从而实现孤子脉冲中心的无偏移传输.

Influence of Controllable Self-steepening on Soliton Propagation in Negative-index Materials

The propagation property of electromagnetic solitons in the negative-index material with a nonlinear polarization is investigated numerically,and the influence of the controllable self-steeping resulted from the dispersive permeability of negative-index material on the propagation property of solitons is analyzed.It is shown that,like the positive self-steeping effect in an ordinary medium,the negative SS effect also leads to the asymmetry of soliton,the shift of soliton center,and the decay of higher-order solitons.The direction of the shift of soliton center is decided by the sign of self-steeping.Furthermore,to some extent,the shift of soliton center resulted from 3rd-order dispersion can be avoided through the use of controllable self-steeping effect,and the soliton can propagate along the propagation axis.