2μm波段高双折射微结构磁流体光纤特性研究  

Characteristics Investigation of High Birefringent Micro-Structured Optical Fiber Filled with Magnetic Fluid at 2μm Band

作　　者：郭玉玉 延凤平[1] 刘硕 张鲁娜 Guo Yuyu;Yan Fengping;Liu Shuo;Zhang Luna(Key Laboratory of All Optical Network and Advanced Communication Network of the Ministry of Education Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China;School of Electronic and Information Engineering, Hebei University of Technology, Tianjin 300401, China)

机构地区：[1]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 [2]河北工业大学电子信息工程学院,天津300401

出　　处：《中国激光》2018年第4期248-253,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61327006;61620106014)

摘　　要：设计了一种新型微结构光纤,光纤包层中具有相互垂直的两对椭圆空气孔,即两个较大的椭圆空气孔和两个较小的填充磁流体的椭圆孔,四个孔包围形成一个类长方形的纤芯。采用有限元法仿真分析了它在2μm波段的双折射特性和损耗特性,并通过优化得到最佳光纤结构参数。仿真结果表明,该光纤结构的模式双折射可以达到10-3,限制损耗低于10^(-11) dB·m^(-1),同时实现了高双折射和低限制损耗的设计目标。通过改变外界磁场可以改变磁流体材料的折射率,进而改变光纤的有效折射率,实现对光纤中所传输的偏振光相位的连续调谐。A new type of micro-structured optical fiber（MOF）is designed.The fiber cladding has two pairs of elliptical air holes that are perpendicular to each other.The larger holes are filled with air and the smaller holes are filled with magnetic fluid.The four holes form a rectangular core.The finite element method is utilized to simulate and analyze the birefringence and confinement loss of the fiber at 2μm wavelength band,and the best fiber structure is obtained by the structure parameters optimization.The simulation results show that the optical fiber model birefringence can reach to 10^（-3）,while the loss is less than 10^（-11） dB·m^（-1）,thus,double standards of high birefringence and low confinement loss are achieved simultaneously.The refractive index of the magnetic fluid material can be changed by change of the external magnetic field,and then the effective refractive index of the fiber is changed.Consequently,the transmission of polarized light in the fiber can be tuned continuously.

关 键 词：光纤光学 微结构光纤 模式双折射 限制损耗 磁流体 

分 类 号：O436[机械工程—光学工程]