飞秒光脉冲在光子晶体光纤不同色散区产生超连续谱的数值分析  

Numerical Analysis of Femtosecond Laser Pulse Propagation and Supercontinuum Generation in Photonic Crystal Fiber

作　　者：张新洁[1] 李和平[1] 廖进昆[1] 唐雄贵[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054

出　　处：《光学与光电技术》2010年第4期31-35,共5页Optics & Optoelectronic Technology

摘　　要：采用预测校正分步傅里叶方法数值模拟了飞秒光脉冲在光子晶体光纤中的非线性传输和超连续谱产生,分析了初始光脉冲的中心波长、峰值功率和光纤长度在光子晶体光纤正、反常色散区对超连续谱形状和带宽的影响。结果表明,当初始光脉冲的中心波长在光纤的反常色散区时,产生的超连续谱宽要远宽于正常色散区,但是光谱的平坦性较差;当光脉冲中心波长在靠近零色散波长的反常色散区且其他脉冲参数不变的情况下,存在一个产生宽且平坦的超连续谱的最佳峰值功率和最佳光纤长度。对于超连续谱系统的优化设计与实际应用具有参考意义。Femtosecond laser pulse propagation and supercontinuum （SC） generation in normal and anomalous dispersion regions of the photonic crystal fiber （PCF） are investigated numerically by using the predictor-corrector symmetrized split-step Fourier method. The effect of the parameters of the initial laser pulses and fiber length on spectral properties of the SC is analyzed. When the wavelength of initial pulses is located in the anomalous dispersion region of PCF, the spectral width is far broader than that in the normal dispersion region, but the spectral flatness of SC is worse. When the wavelength of initial pulses is located in the near-zero anomalous dispersion region of PCF, there exists an optimal fiber length, a peak power of initial pulses for generation of flat and broad SC. The conclusion provides references for optimization of SC generation and its practical applications.

关 键 词：超连续谱 光子晶体光纤 飞秒光脉冲 分步傅里叶方法 

分 类 号：TN929.11[电子电信—通信与信息系统]