三种保偏光纤的偏振特性研究  

Polarization Properties of Three Kinds of Polarization Maintaining Fibers

作　　者：娄淑琴[1] 王智[1] 任国斌[1] 简水生[1] 

机构地区：[1]北京交通大学光波技术研究所,北京100044

出　　处：《铁道学报》2004年第6期50-54,共5页Journal of the China Railway Society

基　　金：国家"863"计划项目(2002AA312190)

摘　　要：应用全矢量模型对3种保偏光纤———椭圆芯光纤、椭圆芯光子晶体光纤和六角芯光子晶体光纤的偏振特性进行了分析。3种保偏光纤的基模场均具有较强的线偏振特性,光子晶体保偏光纤的模式双折射和走离幅度比椭圆芯光纤高1～2个量级。其中六角芯结构更为有效,该结构不仅能有效地限制模场,而且模式双折射和走离幅度比椭圆芯光子晶体光纤高1倍。在所讨论的光子晶体保偏光纤中,大的走离使x和y两个偏振基模无法满足耦合所需的相位匹配条件,耦合效率大幅度下降,更易实现光的保偏传输。这为研制高性能的保偏光纤提供了一条新的途径。A full vector model is used to analyze the polarization properties of three kinds of polarization maintaining fibers (PMFs). It is found that the modal birefringence and walkoff parameter in photonic crystal PMFs are one or two orders of magnitude higher than conventional elliptical core PMFs. Furthermore, the construction of hexagonal core photonic crystal PMFs is more efficient than that of elliptical core photonic crystal PMFs. The modal birefringence and walkoff parameter of the former is twice as that of the latter. A larger walkoff can be obtained in photonic crystal PMFs than in elliptical core fibers. This leads to phase mismatch of two polarized fundamental modes. The coupling efficiency decreases rapidly. Therefore, it is possible to realize light propagation in a certain polarization state. This offers a new way to fabricate polarization-maintaining fibers with high performance.

关 键 词：导波光学 偏振保持光纤 双折射 走离参数 

分 类 号：TN929.11[电子电信—通信与信息系统]