光纤色散对超连续谱产生的影响

对1550nm波长附近具有不同色散特性的光纤产生超连续谱进行了详细的计算和分析。结果表明，在反常色散区和零散区，由于内脉冲拉曼散射效应和三阶色散效应的影响，不能产生平坦、宽带的超连续谱。而在正常色散区，可以产生平坦光滑的超连续谱。进一步研究表明，具有较小正常色散的色散平坦光纤对于产生平坦、宽带的超连续谱极为有效。通过增强脉冲抽运功率，可以得到谱强起伏小于10dB、带宽达300nm以上的平坦超宽超连续谱。

The Effect of Fiber Dispersion on Generation of Supercontinuum

Supercontinuum generation from optical fibers with different group velocity dispersion (GVD) was simulated and calculated in details. It is found that flat and wideband supercontinuum cannot be obtained in anomalous and zero GVD regions because of fiber higher order nonlinearity (intrapulse Raman scattering) and higher order dispersion (TOD). Nevertheless, the broader and smoother supercontinuum spectrum can be obtained in normal GVD region. It is also found that a dispersion flattened fiber with small normal GVD is most suitable for flat and wideband supercontinuum generation. A super wide supercontinuum more than 300 nm with the spectral intensity fluctuation less than 10 dB was generated from such a fiber through increasing the pump power of the pulse.