色散缓变光纤的非线性啁啾效应

由于光孤子在光纤中传输受到啁啾效应等多种因素的影响 ,使孤子脉宽展宽 ,光脉冲在终端变得不可检测 ,严重影响误码率 ,所以研究不同因素对孤子脉宽的影响有其重要意义。本文求解了色散缓变光纤中含频率非线性啁啾效应的NLS方程 ,由得到的孤子解讨论了非线性啁啾效应和色散缓变效应对孤子脉宽的影响 ,由此说明 ,色散缓减效应等效长距离分布参数光纤放大器的增益 ,它导致非线性效应增加 ,孤子进一步被压缩 ,非线性啁啾效应使孤子在z值较小时 ,其脉宽收缩 ,在z值较大时又使孤子脉宽展宽。

Nonlinear Chirp Effect in a Dispersion-slowly Decreasing Fiber

Because the transmission of solition in optical fiber is affected by manifold factors such as chirping effect etc., the pulse width of soliton, and the light impulse becomes undetectable at terminal, which has a strong impact on error code rate. Therefore, it is important to study the effect of different factors on the pulse width of soliton. In this paper the nonlinear Schr?dinger(NLS) equation containing nonlinear chirp effect in a dispersion-slowly decreasing optical fiber was solved, and the influence of the nonlinear chirp effect on the pulse width of soliton was discussed. It is showed that the effect of slowly decreasing dispersion equals to the gain of a long distance dispersed parameter of fiber amplifier, which leads to the increase of nonlinear effect, and the soliton is more compressed. Nonlinear chirp effect causes the soliton pulse width compressed when the value of x is small and causes its pulse width broadened when the value of x is large.