高非线性低色散斜率光子晶体光纤设计  

Design of Photonic Crystal Fiber with High Nonlinearity and Low Dispersion Slope

作　　者：徐惠真[1] 杨兰[1] Xu Huizhen;Yang Lan(School of Science,Jimei University,Xiamen,Fujian 361021,China)

机构地区：[1]集美大学理学院,福建厦门361021

出　　处：《激光与光电子学进展》2021年第5期118-123,共6页Laser & Optoelectronics Progress

基　　金：福建省科技厅中央引导地方科技发展专项(2019L3008);集美大学培育计划(ZP2020061)。

摘　　要：为了提高光子晶体光纤的非线性系数,降低色散斜率和制作难度,提出了一种硅纳米纤芯光子晶体光纤,其纤芯和包层空气孔都为圆形。利用平面波展开法进行仿真,研究了硅纳米纤芯直径、包层空气孔直径、晶格常数三个参量分别对色散和非线性系数的影响。通过优化,最终得到零色散波长在1550 nm处,具有高非线性、低色散斜率的光子晶体光纤。1550 nm处光纤的色散斜率低至0.251 ps·nm^(-2)·km^(-1),非线性系数高达1.0×10^(5)W^(-1)·km^(-1),限制损耗为0.39 dB/km。此外,该光纤结构简单、制作方便,在较小的工艺误差下仍能保持较好的性能。In this study,we propose a type of photonic crystal fiber with a silicon nanocrystal core exhibiting improved nonlinearity and reduced dispersion slope and fabrication difficulty.The core and cladding air holes are round.The effects of the core diameter,the diameter of the air holes in the cladding,and the lattice constant on dispersion and nonlinearity are investigated using the plane wave expansion method.A photonic crystal fiber with high nonlinearity and low dispersion slope can be obtained through optimization when considering a zerodispersion wavelength of 1550 nm.Here,the dispersion slope of fiber at 1550 nm wavelength is as low as 0.251 ps·nm^(−2)·km^(−1),whereas the nonlinear coefficient is as high as 1.0×10^(5)W^(−1)·km^(-1).Further,the confinement loss is 0.39 dB/km.The structure of the photonic crystal fiber is simple and its fabrication is easy.In addition,it can maintain good performance even in the presence of small process errors.

关 键 词：光纤光学 光子晶体光纤 非线性 色散 色散斜率 硅纳米晶 

分 类 号：TN929.[电子电信—通信与信息系统]