光子晶体光纤中入射激光脉冲形状对超连续谱特性的影响  

The effects of the incident laser pulse with different shapes on the characteristics of super continuum generated in photonic crystal fibers

作　　者：李小魁[1] 付国定[1] 张秋慧[1] LI Xiao-kui FU Guo-ding ZHANG Qiu-hui(Department of Electrical Information Engineering, Henan Institute of Engineering, Zhengzhou 451191, China)

机构地区：[1]河南工程学院电气信息工程学院,郑州451191

出　　处：《激光杂志》2017年第4期5-9,共5页Laser Journal

基　　金：国家自然科学基金青年基金(61403123);高等学校重点科研项目(15A510020)

摘　　要：通过非线性薛定谔方程模拟了不同激光脉冲形状在光子晶体光纤中传输时对超连续谱产生特性的影响。研究发现,高斯脉冲和双曲正割脉冲在光子晶体光纤中产生的超连续谱谱宽和形状与原脉冲基本相同;啁啾高斯脉冲和方形脉冲可以在很短的传输距离内得到很宽的光谱,但啁啾高斯脉冲相对于方形脉冲则较为平坦,方形脉冲则产生了很多新的频率成分。因此利用啁啾脉冲可以产生较宽的平坦超连续谱。By using the nonlinear Schrodinger equation, the relationship between the characteristics of supercon- tinuum（SC） spectrum generation and laser pulse shape were investigated in photonic crystal fibers （PCF）. The results show that the spectrum width and shape of the supercontinuum spectrum induced by Gaussian pulse and Sech pulse in photonic crystal fiber are basically the same with the incident pulse. Chirped Gaussian pulse and rectangle pulse can get a broader spectrum in a shorter distance, but the former is flatter than the latter. Square pulse can generate a lot of fresh frequency components. So a flat and broad SC spectrum can be obtained by chirped Gaussian pulse.

关 键 词：超连续谱 光子晶体光纤 入射脉冲形状 非线性光纤光学 

分 类 号：TN248.1[电子电信—物理电子学]