五次非线性对光纤反常色散区调制不稳定性的影响  

Effect of Quintic Nonlinearity on Modulational Instability in the Anomalous-Dispersion Regime of Fiber

作　　者：任志君[1] 王晶[1] 杨爱玲[1] 王珍丽[1] 王进[1] 

机构地区：[1]中国海洋大学光学.光电子实验室,山东青岛266071

出　　处：《中国激光》2004年第5期595-598,共4页Chinese Journal of Lasers

摘　　要：从带五次非线性项的扩展非线性薛定谔方程出发 ,重点考虑了五次非线性对常用的自聚焦光纤中反常色散区调制不稳定性的影响。研究结果表明 ,当入射功率较小时 ,五次非线性对调制不稳定性的影响并不明显 ,这说明了当入射功率很小时 ,忽略非线性薛定谔方程中五次非线性项的做法是合理的 ;随着入射功率的增加 ,五次非线性对调制不稳定性的影响越来越大 ,这种影响主要表现为五次非线性增大了调制不稳定性频谱的范围及增益值 ,并最终减小了使调制不稳定性发生的入射功率范围 ;当入射功率继续增加 ,超过一定的阈值条件时 。In this paper, the effect of quintic nonlinearity on modulational instability in the anomalous dispersion regime of self focusing fiber from extended nonlinear Schrodinger equation is considered. The result shows: the effects of quintic nonlinearity on modulational instability is few, and it is reasonable that quintic nonlinearity can be ignored when input power is small. The effects of quintic nonlinearity on modulational instability are more and more evident when input power increases. Quintic nonlinearity increases the ranges of spectrum and the values of gain of modulational instability, and finally decreases the range of input power that modulational instability will produce. Modulational instability can′t appear when input power continuously increases and exceeds the threshold value.

关 键 词：非线性光学 调制不稳定性 五次非线性 

分 类 号：TN253[电子电信—物理电子学]