低损耗螺旋结构高非线性光子晶体光纤设计  

Design of High Nonlinear Photonic Crystal Fiber with Low Loss Spiral Structure

作　　者：田治军 董洁 侯尚林[1] 雷景丽[1] 武刚[1] 晏祖勇[1] TIAN Zhijun;DONG Jie;HOU Shanglin;LEI Jingli;WU Gang;YAN Zuyong(School of Science,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学理学院,兰州730050

出　　处：《光通信研究》2025年第2期110-116,共7页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61665005)。

摘　　要：【目的】硫系高非线性光纤作为一种潜在的重要光学器件,在中红外波段具有广泛的应用前景。针对红外波段光学信号处理和传输的需求,文章提出了一种硫系高非线性光纤以提高红外波段光学信号处理的效率和性能。【方法】采用有限元法作为设计和分析工具,结合高非线性材料的选择和光纤结构参数的优化,实现了在中红外波段内高效非线性效应的光纤设计。对As_(2)Se_(3)材料的螺旋结构高非线性光子晶体光纤(PCF)进行优化,分析了该光纤在1~7μm波长范围内的限制损耗、色散和非线性系数等光学特性。【结果】研究结果表明,限制损耗在波长不超过6.25μm的范围内可低至10-8数量级,在2~5μm的中红外波段范围内具有色散平坦特性,在1~7μm波段范围内有多个零色散点,非线性系数可高达248630 W^(-1)·km^(-1)。【结论】文章所提光纤可实现中红外波段超宽带低损耗色散平坦和高非线性,在中红外光通信和光传感领域中有潜在的应用前景。【Objective】As a potential important optical device,chalcogenide high nonlinear fiber has a wide application prospect in the mid-infrared region.In order to meet the requirements of optical signal processing and transmission in infrared region,a chalcogenide high nonlinear fiber is proposed to improve the efficiency and performance of optical signal processing in the infrared rgion.【Methods】Using the finite element method as a design and analysis tool,combined with the selection of highly nonlinear materials and the optimization of fiber structure parameters,the fiber design with efficient nonlinear effects in the mid-infrared region is realized.The confinement loss,dispersion and nonlinear coefficient of the highly nonlinear Photonic Crystal Fiber(PCF)with spiral structure of As_(2)Se_(3) material in the wavelength range of 1~7μm are analyzed and optimized.【Results】The results show that the confinement loss can be as low as 10-8 orders of magnitude at the wavelength range of no more than 6.25μm.It has dispersion flattening characteristics at the mid-infrared region range of 2~5μm.There are multiple zero dispersion points in the range of 1~7μm,and the nonlinear coefficient can be as high as 248630 W^(-1)·km^(-1).【Conclusion】The fiber can realize ultra-wideband low loss dispersion flatness and high nonlinearity in the mid-infrared region,and has potential application prospects in the field of mid-infrared optical communication and optical sensing.

关 键 词：光纤光学 光子晶体光纤 非线性 色散 中红外波段 

分 类 号：TN252[电子电信—物理电子学]