论文部分内容阅读
本文通过解薛定谔方程分别研究了线性光纤中色散导致具有初始频率啁啾的高斯脉冲展宽的详细物理过程和非线性光纤中自相位调制导致光脉冲频谱展宽的详细物理过程 ,得到高斯脉冲在光纤中群速度色散所导致的频率啁啾在反常色散区是下啁啾 (负啁啾 ) ,与脉宽的关系是线性的 ,自相位调制所产生的频率啁啾是上啁啾 (正啁啾 ) ,在脉冲的中心部分近似为线性 ,当CPβ2 <0时 ,脉冲有一个初始窄化的阶段等结论。最后用计算机模拟光孤子传输估算出形成孤子的初始啁啾范围值。
In this paper, the detailed physical processes of Gaussian pulse broadening caused by chromatic dispersion with initial frequency in linear fiber and the physical process of self-phase modulation in non-linear fiber resulting from broadening of optical pulse spectrum are studied respectively by solving Schrödinger equation. The frequency chirp caused by the group velocity dispersion is lower chirp (negative chirp) in the anomalous dispersion region, and the relation with the pulse width is linear. The frequency chirp produced by self-phase modulation is up-chirped (positive chirp) , Is approximately linear in the central part of the pulse, and when CPβ2 <0, the pulse has an initial narrowing phase. At last, the initial chirp value of the soliton is estimated by computer simulation of optical soliton transmission.