超低损耗低非线性平坦色散光子晶体光纤优化设计  

Optimization Design of Ultra-low Loss Low Nonlinear Flatten Dispersion Photonic Crystal Fiber

作　　者：薛璐 张亚妮 朱雨雨 郗亚茹 许强 梅森 孔德鹏[4] XUE Lu;ZHANG Ya-ni;ZHU Yu-yu;XI Ya-ru;XU Qiang;MEI Sen;KONG De-peng(School of Physics and Optoelectronics Technology,Baoji University of Arts&Science,Baoji, Shaanxi 721016,China;Baoji Engineering Technology Research Centre on Ultrafast Laser and New Materials,Baoji,Shaanxi 721016,China;School of Arts and Sciences,Shaanxi University of Science&Technology,Xi’an 710021,China;Research Department of Information Photonics,Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences,Xi’an 710119,China)

机构地区：[1]宝鸡文理学院物理与光电技术学院,陕西宝鸡721016 [2]宝鸡市超快激光与新材料工程技术研究中心,陕西宝鸡721016 [3]陕西科技大学文理学院,西安710021 [4]中国科学院西安光学精密机械研究所信息光子学室,西安710119

出　　处：《光子学报》2018年第11期30-38,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11647008;11504416);陕西省国际科技合作与交流项目(No.2018KW-016);宝鸡市重大科技专项计划项目(No.2015CXNL-1-3);陕西科技大学重点科研项目(No.2018WLXY-01-01)资助~~

摘　　要：以二氧化硅为基材,优化设计了一种圆空气孔六角点阵光子晶体光纤,通过减小纤芯内层6个小空气孔以增加模场面积,降低非线性系数.采用时域有限差分法结合完美匹配层吸收边界条件,对该光纤色散、非线性、约束损耗和基模模场与光纤结构参数之间的关系进行了数值分析.结果表明,该光纤呈现一定的超低损耗低非线性色散平坦特性,其在最优结构参数下通信波长处的约束损耗小于10-7 dB·km^(-1),在波长1.55μm和1.31μm处约束损耗分别为2.93×10-8 dB·km^(-1)和7.33×10^(-1)0dB·km^(-1),且波长从1.05μm到1.65μm色散值大约为0±1.7ps·km^(-1)·nm^(-1),呈现双零色散点和较长波长范围的色散平坦特性.在低损耗通信波长1.55μm附近非线性系数约为4.88km^(-1) W^(-1).该光纤呈现的超低损耗低非线性平坦色散能力,可用于长距离大容量高速光通信系统.A novel simple structure of photonic crystal fiber is optimized based on silica as the backing material,which has a cladding of hexagonal symmetric array uniform circle air hole and a larger the area of fiber core by missing central air column and reducing six air holes around the central core.Based on finite difference time domain method with the boundary conditions of anisotropic perfectly matched layers,its dispersion,nonlinear,confinement loss and fundamental mode field is numerically investigated.Numerical results indicate that the proposed fiber shows ultra-low loss,low non-linear and flattened dispersion performance.Its confinement loss is less than 10-7 dB·km^-1 over communication band,which is 2.93×10-8 dB·km^-1 and 7.33×10^-10 dB·km^-1 at wavelength of 1.55μm and 1.31μm,respectively.Furthermore,it appears double zero dispersion point and a certain ultra-flatten dispersion in the longer wavelength range,which flattened dispersion is 0±1.7 ps·km^-1·nm^-1 over 1.05~1.65μm.Another,its non-linear coefficient is only 4.88 km^-1 W^-1 at wavelength of 1.55μm.It is obviously to obtained admirable application in the field of long distance high speed optical communication system due to its ultra-low loss low non-linear and flatten dispersion capability.

关 键 词：导波与光纤光学 光子晶体光纤 时域有限差分法 低非线性 低损耗 平坦色散 

分 类 号：O438[机械工程—光学工程] TN919.11[理学—光学]