双空芯光子晶体光纤表面模控制方法  

Control of surface modes in hollow dual-core photonic crystal fibers

作　　者：马玲芳[1] 刘敏[1] 董传培[1] 张敏[1] 贺冯良[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《激光技术》2011年第6期748-751,共4页Laser Technology

基　　金：中央高校基本科研业务费资助项目(CDJXS11160005)

摘　　要：表面模与纤芯基模耦合是使双空芯光子晶体光纤产生无耦合点的根本原因。为进一步探究双空芯光子晶体光纤中表面模的产生及控制机理,采用平面波展开和全矢量有限元法,分析了纤芯周围石英环相对厚度和纤芯的截切半径对表面模和无耦合点的影响。结果表明,纤芯截切半径固定时,随着石英环相对厚度的增大,无耦合点向长波长方向移动;石英环相对厚度固定为1时,纤芯最佳截切半径为0.9Λ～1.0Λ,可以较好地抑制表面模。这为新型双空芯光子晶体光纤的结构设计和现实应用提供了理论依据。The coupling of the surface modes and the fundamental modes is the root of the disappearance of coupling points between the two cores of the hollow dual-core photonic crystal fibers. In order to study the mechanism of the appearance and control of surface modes, the full vector finite element method and the plane wave expansion method were used to study the effect of the silica ring or the core radius on the surface modes and the change of the uncoupling point. The numerical simulation shows that with the same core radius, the uncoupling point moves to longer wavelength with the increase of the normalized thickness of the silica ring. And the optimal range of core radius that is free of surface modes is from 0.9A to 1.0A when the normalized thickness of the silica ring is set to 1. The results provide theoretical evidence to design the novel hollow dual-core photonic crystal fibers, enriching and consummating the theoretical foundation for the hollow dual-core photonic crystal fibers.

关 键 词：光纤光学 表面模 全矢量有限元法 石英环相对厚度 纤芯截切半径 

分 类 号：TN253[电子电信—物理电子学]