共查询到19条相似文献,搜索用时 67 毫秒
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给出了描述连续波扰动下飞秒光脉冲在光纤系统中传输的微扰高阶非线性薛定谔方程,通过矩法和微扰理论分析了飞秒亮孤子与连续波相互作用的特性,并利用龙格-库塔积分和分步傅里叶方法进行了数值模拟.结果表明,连续波微扰对光纤孤子通讯系统是十分有害的,在实际通讯过程中应当尽量避免连续波的渗入. 相似文献
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高阶效应影响下飞秒孤子间的相互作用 总被引:1,自引:1,他引:0
本文从高阶非线性薛定谔方程(HNLS)出发,给出了其Lax对,同时运用Darborx变换求得了N-孤子解和双孤子解的显式表达式,并且给出了在一定初始条件下谱参数的近拟本片值。最后通过数值模拟对解析结果作了验证,结果表明:高阶效应的联合作用在一定程度上能够减弱飞秒孤子间的相互作用。 相似文献
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针对孤子串在传输过程中发生周期性碰撞,导致信息串扰的问题,提出采用准确度较高的辛普森公式近似地改进对称分步傅里叶变换,对孤子串的传输特性及传输过程进行数值模拟.实验结果表明,当初始半间距为2.5时,对于孤子对、三孤子、四孤子、五孤子和六孤子而言,只考虑自陡峭效应且自陡峭系数都为0.02时,或者只考虑自频移效应且自频移系数分别为1、1、3、2、1.5时,都能有效地减少孤子间的碰撞,增加孤子碰撞前的独立传输距离,当同时考虑自陡峭效应和自频移效应时,自频移效应占主导作用. 相似文献
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有机高聚物是一种具有大非线性系数和较快非线性响应时间的非线性材料。本文通过对含有二阶,三阶色散效应和非线性响应时间改进的非线性薛定谔方程进行了数值模拟求解,分析了飞秒光脉冲在有机高聚物聚苯基喹恶啉中的传输特性。 相似文献
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We investigate the dynamics of femtosecond solitons in photonic crystal fibers (PCFs) by including high-order dispersion terms until to sixth-order in the generalized nonlinear Schrödinger equation, in addition to the nonlinear effects of the self phase modulation, self steepening and Raman scattering. We calculate theoretically the pulse parameters using the moment method. In the case of the fundamental soliton, our computed equations are coupled and difficult to solve analytically. However, we use the finite difference method to calculate numerically pulse parameters using an initially hyperbolic secant pulse at 1550-nm with different peak powers along 10m-PCF. Our numerical results show that the nonlinear regimes allow obtaining pulse compressions and initial pulse amplitudes. Furthermore, we remark a pulse broadening, and weak shifts of the peak power positions and frequencies in the critical and dispersive regimes. The use of an initial chirp provides a better pulse compressions and especially for low input powers. Also, the initial positive chirp reduces the optimal compression position lengths, while the negative one increases them. Therefore, we conclude that our theoretical calculations and numerical simulation results show that the moment method associated with the finite differences method is effective for the study of femtosecond pulse dynamics in PCFs. 相似文献
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The formation and propagation of dipole domains in superlattices are studied both by the modified discrete drift model and by the nonlinear schroedinger equation,the spatiotemporal distribution of the electric field and electron density are presented.The numerical results are compared with the soliton solutions of the nonlinear Schroedinger equation and analysed.It is shown that the numerical solutions agree with the soliton solutions of the nonlinear Schroedinger equation.The dipole electric-field domains in semiconductor superlattices have the properties of solitons. 相似文献
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利用考虑拉曼增益效应的非线性薛定谔方程, 在忽略光纤损耗的情况下, 采用基于MATLAB的分步傅里叶数值算法, 得出线性算符和非线性算符具体的表达式, 分步作用于光孤子脉冲传输方程, 仿真模拟了光孤子在光纤中传输时的演变. 与不考虑拉曼增益的光孤子在光纤中传输相对比, 探析了拉曼增益对孤子传输特性的影响.拉曼增益会破坏孤子的传输周期, 导致孤子在光纤中传输时快速衰减, 并且影响程度和输入孤子的脉冲峰值功率大小有关, 拉曼增益对基态孤子和高阶孤子的影响也不相同.
关键词:
拉曼增益
孤子
对称分步傅里叶法
非线性薛定谔方程 相似文献
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Using the wave packet theory,we obtain all the solutions of the weakly damped nonlinear Schrodinger equation.These solutions are the static solution,and solutions of planar wave,solitary wave,shock wave and elliptic function wave and chaos.The bifurcation phenomenon exists in both steady and non-steady solutions.The chaotic and periodic motions can coexist in a certain parametric space region. 相似文献
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In this paper we described how different line coding techniques vary with values of jitter in soliton transmission system. Then the idea of this soliton transmission system is applied for multiuser structure and effects of initial line phase spacing are examined. 相似文献
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From the study of the dynamics for the ring-like soliton clusters, we find that there exists a critical value of the ring radius, dcr, for the stationary rotation of the clusters with respect to the beam centre even in the presence of the relatively strong noise, and that the soliton clusters will not rotate but only undergo periodic collisions in the form of simple harmonic oscillator if the ring radius is large enough. We also show that the direction of the rotation can be opposite to the direction of phase gradient when the relative phase difference is within the domain 0 〈 |θ| 〈 π, while along the direction of phase gradient when the relative phase difference is within the domain π 〈|θ| 〈 2π 相似文献
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Conservation laws of the generalized nonlocal nonlinear Schrodinger equation 总被引:1,自引:0,他引:1 下载免费PDF全文
The derivations of several conservation laws of the generalized
nonlocal nonlinear Schr?dinger equation are presented. These
invariants are the number of particles, the momentum, the angular
momentum and the Hamiltonian in the quantum mechanical analogy. The
Lagrangian is also presented. 相似文献