双芯耦合光纤准基孤子演化行为及孤子相互作用和啁啾效应的影响  

Evolution Behavior of the Quasi-fundamental Soliton in the Twin-core Coupling Fibers and the Influence of Linear Chirp and Interaction Between Optical Soliton on This Evolution

作　　者：罗质华[1] 余超凡[1] 

机构地区：[1]广东教育学院物理系,广东广州510303

出　　处：《南昌大学学报（理科版）》2009年第5期465-471,480,共8页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(10574163)

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)<c(0),考虑到孤子间相互作用,其充分条件要求啁啾演变特征参量c1<0,啁啾演变宗量Qc<0,因而演化由于啁啾效应的抑制,保持η(z)<η(0);(3)孤子相互作用随道宽q2(z)和啁啾c2(z)呈指数衰减演变,为使孤子相互间不发生远离,在道宽演变宗量Qq>0条件下,q(z)呈tanh—型演化方式。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.

关 键 词：双芯耦合光纤 啁啾效应 孤子相互作用 准基孤子演化 

分 类 号：O431.2[机械工程—光学工程]