零色散附近的调制不稳定性  

Modulation Instability in the Region of Minimum Group-velocity Dispersion

作　　者：张书敏[1] 徐文成[2] 

机构地区：[1]河北师范大学物理系,河北石家庄050091 [2]华南师范大学量子电子学研究所,广东广州510631

出　　处：《半导体光电》2001年第6期390-393,共4页Semiconductor Optoelectronics

基　　金：河北省教育厅 2 0 0 1年科研计划课题资助项目(2 0 0 12 4 1)

摘　　要：在同时考虑光纤损耗及高阶色散的前提下 ,从广义的非线性Schr dinger方程出发 ,研究了单模光纤在零色散附近的调制不稳定性。研究表明 ,当光脉冲工作在最小群速度色散附近时 ,四阶色散对光纤的调制不稳定性起决定作用 ,它使最大微扰频率向临界微扰频率靠近 ;研究同时发现 ,光纤损耗亦对增益谱的谱宽有较大影响 ,它使增益的谱宽变窄 。Modulation instability in the region of minimum group velocity dispersion of single mode fibers is investigated using an extended Schrdinger equation.It is shown that the fourth order dispersion dominates over the critical modulation instability frequency when second order dispersion approaches its minimum value at the so called zero dispersion wavelength.Research also shows that the effect of fiber loss is to reduce the frequency range over which the gain occurs,and is dependent not only on the incident power but also on the propagating distance.

关 键 词：调制不稳定性 光纤 零色散 

分 类 号：TN253[电子电信—物理电子学]