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高双折射光子晶体光纤特性分析
引用本文:龚桃荣,延凤平,王琳,李一凡,刘鹏,简水生.高双折射光子晶体光纤特性分析[J].中国激光,2008,35(4):559-562.
作者姓名:龚桃荣  延凤平  王琳  李一凡  刘鹏  简水生
作者单位:北京交通大学光波技术研究所,全光网络与现代通信网教育部重点实验室,北京,100044
摘    要:建立了基于透明边界条件(TBC)的全矢量迦辽金有限元法(FEM)分析二维光子晶体光纤(PCF)的模型,并对椭圆芯等5种高双折射光子晶体光纤基模的模式双折射、限制损耗及色散特性进行了数值分析和比较.通过减小内包层中沿x方向的空气孔,增大沿y方向的空气孔构成的一种光子晶体光纤的模式双折射在波长1550 nm处高达5.96×10-3,而椭圆芯光子晶体光纤为1.52×10-3.研究表明,可通过增加内包层中两个正交方向上空气孔的尺寸差来获得高双折射;同时还得出内包层中放大的空气孔减小限制损耗,增加色散,而减小空气孔尺寸带来的影响则刚好相反;内包层上空气孔数量越少,色散越平坦.

关 键 词:光纤光学  光子晶体光纤  有限元法  双折射
收稿时间:2007/8/11

Analysis of Properties of High Birefringence Photonic Crystal Fibers
Gong Taorong,Yan Fengping,Wang Lin,Li Yifang,Liu Peng,Jian Shuisheng.Analysis of Properties of High Birefringence Photonic Crystal Fibers[J].Chinese Journal of Lasers,2008,35(4):559-562.
Authors:Gong Taorong  Yan Fengping  Wang Lin  Li Yifang  Liu Peng  Jian Shuisheng
Abstract:The model of full vector Galerkin finite element method (FEM) with transparent boundary conditions (TBC) is established. The modal birefringence, confinement loss and dispersion of the fundamental mode of five kinds highly birefringent photonic crystal fibers (PCFs) with elliptical cores are analyzed and compared. The modal birefringence of a photonic crystal fiber, which is formed by diminishing air holes along x-direction and enlarging air holes along y-direction in inner cladding, is 5.96×10-3 at the wavelength of 1550 nm, while that of a photonic crystal fiber with elliptical core is 1.52×10-3. The results show that high birefringence can be obtained by increasing the difference of air holes size along orthogonal direction in inner cladding. It is also proved that enlarged air holes of inner cladding reduce the confinement loss, and increase the dispersion, but the impact of diminished air holes is reversed; the fewer the air holes in inner cladding are, the flatter the dispersion is.
Keywords:fiber optics  photonic crystal fiber  finite element method  birefringence
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