光子晶体光纤包层中气孔和掺杂介质柱尺寸对光纤带隙特性的影响  

Influence of the Air-Hole Size and Doped Dielectric Cylinders Size in Cladding on Photonic Crystal Fiber

作　　者：侯金钗[1] 李曙光[1] 刘司英[1] 甄海龙[1] 

机构地区：[1]燕山大学理学院亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《中国激光》2009年第3期663-667,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(10874145);燕山大学博士基金(B153)资助课题

摘　　要：采用平面波展开法(PWM)研究了基于三角晶格、复合蜂窝晶格和改进的复合蜂窝晶格光子晶体光纤(PCF)的包层中不同层气孔和掺杂介质柱尺寸对光纤带隙的影响。结果表明,在第m层(m=1,2,3)空气孔直径改变同样大小的情况下,随着m的增大,第m层空气孔尺寸的变化对带隙的影响越来越小;通过改进光纤结构中介质柱的排列,或掺杂折射率比较大的介质,可以有效地调节或增宽光子带隙(PBG),具有改进的复合蜂窝晶格结构的光子晶体光纤可实现更宽的带隙分布。The influence of the air hole size of different rings and the doped dielectric cylinders size in the cladding on the band gap is investigated by plane-wave expansion method(PWM), for photonic crystal fibers(PCF) based on the triangular periodic structure, the composite honeycomb structure and the improved composite honeycomb structure. It is demonstrated that photonic crystal fiber band gap is most sensitive to the air hole size variation in the first two rings. When the change of the air hole size in the m-th ring is constant, the effect of the air hole size changing on the band gap decreases with the increasing of m. Through improving the arrangement of these dielectric cylinders in structure or doping the high refractive-index medium, the band gap can be regulated or made wider effectively. Compared with other two structures, photonic crystal fiber with improved composite honeycomb structure can achieve a wider band gap.

关 键 词：光纤光学 光子晶体光纤 改进的复合蜂窝晶格 光子带隙 平面波展开法 

分 类 号：O437[机械工程—光学工程]