初始啁啾对光信号传输影响的仿真分析  

Simulation Analysis of Influence of Initial Chirp on Propagation of Optical Signal

作　　者：袁中保[1] 朱军[1] 刘志超[1] 

机构地区：[1]安徽大学电子科学与技术学院,安徽合肥230039

出　　处：《计算机技术与发展》2009年第11期171-174,共4页Computer Technology and Development

基　　金：国家自然科学基金资助项目(60772123);安徽大学人才队伍建设经费资助项目(02203105)

摘　　要：在群速度色散和自相位调制的共同作用下,可用分步傅里叶方法模拟初始啁啾对高斯脉冲在光纤中传输的影响。由于存在初始啁啾,使高斯脉冲在传输过程出现一些新的现象。数值模拟结果表明:在正常色散区,非啁啾的高斯脉冲能够保持原来的形状传输较长一段距离,当C<0,且-5<C<-1时,脉冲在传输的初始阶段,出现短暂的窄化现象,然后随着传输距离的增加,脉冲迅速展宽;当0<C<3时,脉冲缓慢展宽,脉冲形状基本不变;但当C>4时,脉冲将随着传输距离的增加剧烈展宽,同时脉冲峰值也会偏移,当C>6时,脉冲形状发生剧烈畸变。在反常色散区,可得到类似的结果。研究结果对于克服码间干扰、提高光信号传输质量提供了有意义的指导。Under the combined effects of group - velocity dispersion and self- phase modulation , the step Fourier method can be used to simulate the propagation of initial chirped Gaussian pulses inside fiber. For the existing of initial chirp, some new phenomena of Gaussian pulses emerge during the process of propagation. Numerical simulation results show that： in the nomalous-dispersion ragime, non- chirped Gaussian pulses can keep their shapes and propagate a longer distance inside the fiber. The phenomenon of pulse shape compression appears at the initial stage of propagation in the range of C 〈 0,and- 5 〈 C 〈 - 1,and pulses are broaden rapidly with the increase of propagation distance;In the range of 0 〈 C 〈 3, pulse width is broaden slowly, and pulse shape will remain basically unchanged;But pulse will he broaden rapidly and sharply with the increase of propagation and the peak pulse also be offsetted in the range of C 〉 4, and if when in the range of C 〉 6, pulse shape is distorted. Similar results are available in the abnomalous- dispersion regime. The results provide a meaningful guide for overcoming inter- symbol interference and improving propagation quality of optical signals.

关 键 词：初始啁啾 高斯脉冲 群速度色散 自相位调制 

分 类 号：TP929.1[自动化与计算机技术]