铋酸盐玻璃高双折射大负色散微结构光纤设计  

Bismuthate Glass Microstructure Fiber with High Birefringence and Large Negative Dispersion

作　　者：许鹏飞 宋向阳 周德春[1] 刘敏强 彭艳芳 李佳澄 宋春来 Xu Pengfei;Song Xiangyang;Zhou Dechun;Liu Minqiang;Peng Yanfang;Li Jiacheng(Song Chunlai School of Materials Science and Engineering,Changchun University of Science and Technology,Changchun,Jilin 130022,China)

机构地区：[1]长春理工大学材料科学与工程学院,吉林长春130022

出　　处：《中国激光》2021年第24期125-133,共9页Chinese Journal of Lasers

基　　金：吉林省科技发展计划重点研发项目(20200401053GX)。

摘　　要：设计了一种基于36Bi_(2)O_(3)-30GeO_(2)-15Ga_(2)O_(3)-10BaF_(2)-9Na_(2)O玻璃的可在~3μm波段同时实现高双折射和大负色散的微结构光纤,该光纤结构包括空气孔呈矩形排列的内包层和空气孔呈正六边形排列的外包层。运用全矢量有限元法结合完美匹配层边界条件,从理论上研究了光纤波导结构参数对光纤双折射特性和色散特性的影响。结果显示:在波长2740 nm处,当微结构光纤的结构参数为外包层孔间距Λ_(out)=1.5μm,外包层占空比dout/Λ_(out)=0.68,内包层占空比d_(in)/Λ_(in)=0.86,Λ_(out)/Λ_(in)=3时,光纤基模的双折射值达到0.0296,x方向偏振基模的色散系数可达-3204.75 ps·nm^(-1)·km^(-1)。结果表明,所设计光纤对~3μm波段光纤激光器的色散与双折射调控或光纤传感领域扩展具有一定的指导意义。Objective Microstructure fiber(MF)has wide applications in fiber laser,fiber sensing,optical communication,and nonlinear optics owing to the controllable periodic arrangement of air holes in the cladding.It has new optical properties that distinguish it from traditional fibers,such as flexible and controllable dispersion,high birefringence,and high nonlinearity.However,the presence of dispersion will severely limit optical fiber transmission.The dispersion compensation fiber with large negative dispersion can effectively solve this problem.The birefringence of optical fiber has received a lot of attention as a result of the development of new transmission technology.There has been little research in the~3μm band on dispersion compensation and birefringence control.High birefringence and large negative dispersion at~3μm can be achieved simultaneously in another glass matrix,such as silicate glass and tellurite glass,by adjusting the waveguide structure parameters and the structure optimization design of optical fiber.However,Si-O-Si has strong vibration absorption in the infrared band,so the silica matrix material cannot meet the requirements of~3μm application.Moreover,tellurite glass has poor mechanical strength,so drawing fibers is difficult.Bismuthate glass has a broad infrared transmission region,good thermal stability,low phonon energy(approximately 750cm-1),and a high refractive index.Bismuthate glass is considered an ideal gain medium material in the midinfrared band.Therefore,we proposed a new bismuthate glass microstructure fiber with high birefringence and large negative dispersion in the~3μm band.The proposed MF has some guiding significance for dispersion and birefringence control fiber lasers or fiber sensing in the~3μm band.Methods Fig.1shows the cross-section of the proposed MF.The MF consists of three regions,rectangular fiber core,inner cladding,and outer cladding.The main structure parameters of MF include air hole diameter(din,dout),air hole lattice parameter(Λ_(out),Λin,andΛ_(out)/Λ_(

关 键 词：材料 微结构光纤 铋酸盐玻璃 双折射 色散 全矢量有限元法 

分 类 号：TN253[电子电信—物理电子学]