全波段正常色散光子晶体光纤中超连续谱的产生

摘要

设计了一种铅硅酸盐SF57材料的光子晶体光纤,利用有限元法数值模拟了该光纤的色散特性。研究结果显示在整个透明波段光纤具有正常色散。利用自适应分布傅里叶法求解非线性薛定谔方程,对中心波长为1550 nm,初始脉宽为150 fs的脉冲在该光纤中传输进行了模拟,获得了关于入射脉冲中心波长对称的展宽范围超过了600 nm的超平坦连续光谱,并且光谱具有极其稳定和相干的特性。%A kind of lead silicate photonic crystal fiber (PCF) is proposed in this paper. The dispersion characteristics of this SF57 PCF are studied by the finite element method. The reasults demonstrate that the PCF presents all-normal dispersion profiles in the visible and infrared spectral regions. We use an adaptive split-step Fourier method to study the propagations of the 1550 nm and 150 fs laser pulse in the PCF. The resulting spectral profiles are extremely flat from 1300 nm to 1900 nm and have excellent stabibities and coherence properties.