单模光纤中四阶色散导致的调制不稳定性  

Modulational Instability in Monomode Optical Fibers in the Presence of Fourth Order Dispersion

作　　者：文双春 徐文成[1] 郭旗[1] 刘颂豪[1] 

机构地区：[1]衡阳师范高等专科学校,华南师大量子电子学研究所

出　　处：《光通信研究》1997年第4期34-38,共5页Study on Optical Communications

基　　金：国家攀登计划资助

摘　　要：利用修正的非线性Ｓｃｈｒｏｄｉｎｇｅｒ方程研究了单模光纤中在最小群速度色散波长附近的调制不稳定性。从理论上给出了一个新的由光纤四阶色散导致的调制不稳定区域，新区域的最大调制增长率和调制范围与光脉冲的初始入射功率和四阶色散有关。光纤自陡峭效应和Ｒａｍａｎ延迟效应对调制不稳定区域的最大调制增长率和调制范围都有影响，自陡峭效应对新区域的影响较大且存在一个决定新区域出现与否的阈值。Ｒａｍａｎ延迟效应对调制不稳定性的影响比自陡峭效应显著，尤其当Ｒａｍａｎ延迟效应较强时，它使两个区域合并成一个具有更大调制范围的调制不稳定区域。Modulational instability of femtosecond optical pulses in fibers near zero dispersion point is investigated using an extended Schrodinger equation.A new region where modulation instability occurs is found due to the fourth order dispersion.It is shown that the self steeping exists a threshold in affecting the appearance of the new region,Raman nonlinear retarded effect has a greater influence on growth rate,and spectral extents of the two unstable regions can make the two regions merge into one region which has a wider spectral extent.

关 键 词：四阶色散 调制不稳定性 单模光纤 光纤传输线 

分 类 号：TN818[电子电信—信息与通信工程]