光子晶体光纤中非线性传输的数值研究  

Numerical study of nonlinear propagation in photonic crystal fiber

作　　者：王润轩[1] 

机构地区：[1]宝鸡文理学院物理系,陕西宝鸡721007

出　　处：《激光与红外》2009年第6期622-625,共4页Laser & Infrared

摘　　要：数值模拟了飞秒激光脉冲在光子晶体光纤中的非线性传输过程,详细计算分析了自相位调制(SPM)、脉冲内拉曼散射(ISRS)、自陡峭(SS)以及群速度色散(GVD)、三阶色散(TOD)、四阶色散(FOD)对脉冲传输和频谱的影响。结果表明,在反常色散区,脉冲内拉曼散射以及三阶、四阶色散对频谱的展宽和脉冲的平滑都有着重要作用;而自陡峭是使高阶孤子分量产生分裂衰变,对光谱的不对称展宽有一定影响。A theoretical investigation with the method of split-step Fourier is presented on nonlinear propagation of a femtosecond laser pulse in a photonic crystal fiber. The impact of self-phase modulation （SPM） and intrapulse stimulated Raman scattering （ISRS） and self-steepening （SS） and group velocity dispersion and third-order dispersion （TOD） and fourth-order dispersion （FOD） on pulse shape and spectrum of the Width is simulated and analyzed. The numerical results show that the red-shifted wavelength and smoothing of spectrum is strongly dependent on the ISRS and TOD and FOD in the abnormal dispersion region. The high-order soliton of fissile and spectrum of asymmetric are found to be related to the self-steepening.

关 键 词：光子晶体光纤 飞秒光脉冲 超连续谱 脉冲内拉曼散射 自陡峭 

分 类 号：O437[机械工程—光学工程]