中文摘要：

应用变分原理,在考虑三阶色散、损耗和孤子间相互作用的情况下,对双芯耦合光纤中准基孤子的演化行为进行研究,分析了孤子相互作用和啁啾效应对孤子传输行为的影响。推导了准基孤子参量演化的耦合方程组,在小涨落近似（即旋波近似）下求解了准基孤子参量的初值演化。结果表明：（1）考虑孤子相互作用,脉宽演变特征参量b0〈0,在此条件下,脉宽近似以指数衰减行为演化,η（z）〈η（0）;（2）为了限制啁啾c（z）效应,即c（z）按tanh-型初值演化,c（z）0条件下,q（z）呈tanh—型演化方式。

英文摘要：

On the basis of the variation principle, in considering the third - order dispersion and loss, and the interaction between optical solitons, it studied the evolution behavior of the quasi - fundamental soliton in twin - core coupling fibers and analyzed the influence of linear chirp and interaction between optical solitons on the evolution process of the quasi - fundamental solitons. The nonlinear coupling system of equations for the quasi - fundamental soliton parameters has been derived. Using the small fluctuation approximation （ rotating wave approximation）, it found the initial - valued evolution of the optical soliton parameters. The following has been observed ： （ 1 ） By considering the interaction between optical solitons it has the evolved characteristics parameter of the pulse width b0 〈 0. Under this condition the pulse width evolves in the exponential decay form approximately η（z） 〈 η （0）- （2） In order to restrict the linear chirp effect （meaning c （z） evolves by tanh initial -valued form c （z） 〈 c （0） ）with regard to the interaction between optical solitons we found the evolved characteristics parameter of the linear chirp must be c1 〈 0 and the corresponding evolution argument must be Qc 〈 0, so that the initial - valued evolution of linear chirp is maintained in η（z） 〈 η（0）. （3） With the channel width q^2（z） and the linear chirp c^2（z） the interaction between optical solitons evolves in the exponential decay form. To avoid having further separation between the optical solitons the channel width q（z） must evolve in the tanh -form under the condition where the evolution argument of the channel width must be Qq〉0.