低损耗大模面积W型布喇格光纤  

Low-loss Large Mode Area Bragg Fiber with a W-shape Core

作　　者：闫培光[1] 赵健[1] 郭春雨[1] 赵俊清[1] 舒杰[1] 阮双琛[1] 李相[2] 陈胜平[2] 

机构地区：[1]深圳大学电子科学与技术学院,广东深圳518060 [2]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《光子学报》2011年第2期174-177,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61007054;No.10904173);深圳市科技计划项目(No.200718);广东省自然科学基金(No.9451806001002428)资助

摘　　要：通过有限元法建立模型,讨论了布喇格光纤设计参量对光子带隙的影响,发现当增加掺锗玻璃环的厚度或折射率时,会使带隙移向长波.通过在紧邻纤芯处施加一层掺氟低折射率玻璃,设计了一种大模面积W型布喇格光纤.计算表明:W型布喇格光纤可以有效减小限制损耗,提高光纤的抗弯曲能力.本文设计的布喇格光纤的纤芯直径为30μm,在波长1.06μm限制损耗约为0.1 dB/km,且维持单一横模传输.The influence of Bragg fiber design parameters on photonic bandgap was discussed via the finite element method.The theoretical results show that the bandgap move to long wavelength when the thickness or the refractive index of the Ge-doped layers increases.A novel W-shape-core Bragg fiber was firstly proposed by introducing a F-doped low index layer adjacent of fiber core.The calculation demonstrates the W-shape-core Bragg fiber can reduce the confinement loss and improve the bending-resistant ability effectively.A W-shape-core Bragg fiber was designed with a core diameter of 30 μm,which has a loss of 0.1 dB/km at wavelength of 1.06 μm and is proved single mode propagation theoretically.

关 键 词：布喇格光纤 大模面积 反共振反射型光波导 

分 类 号：TN929.11[电子电信—通信与信息系统]