光子晶体光纤耦合器中的标量调制不稳定性  

Scalar modulation instability in photonic crystal fiber couplers

作　　者：贾维国[1] 周严勇[1] 韩永明 包红梅[1] 扬盛际[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021 [2]内蒙古自治区产品质量检验所,呼和浩特010010

出　　处：《物理学报》2009年第9期6323-6329,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60468001)资助的课题~~

摘　　要：从光纤耦合器的耦合模方程出发,用偶奇超模对其进行重写,讨论了当输入条件使奇偶超模其中之一被单独激发时,在光子晶体光纤耦合器中的调制不稳定性.结果表明:光子晶体光纤耦合器中在正常和反常色散区均存在调制不稳定性,并且调制不稳定性与三阶色散项无关、与四阶色散项有关,给出了增益谱在不同色散区随输入功率的变化关系;当满足一定条件时,在光子晶体光纤耦合器中传播的准连续波可以分解成脉冲序列,由此可以分离和提取超短脉冲.The nonlinear coupled-mode equations are rewritten by even and odd modes. We study modulation instability of photonic crystal fiber couplers when either even or odd mode is launched alone. The result shows that there are new types of modulation instability in both the normal and the anomalous-dispersion regimes. Modulation instability is related with four phase dispersion and has no relation with three phase dispersion. The gain spectra have been given as function of input power in various dispersion regimes. Quasi-cw can be changed into pulse array under certain conditions, and we can extract super-short pulses from it.

关 键 词：光子晶体光纤耦合器 偶次超模 奇次超模 标量调制不稳定性 

分 类 号：TN253[电子电信—物理电子学]