论文部分内容阅读
从频域全场方程出发研究了色散平坦渐减光纤中超连续谱(SC)的产生。结果表明,色散平坦渐减光纤的初始色散和色散斜率对超连续谱的产生有重要影响,当超连续谱宽度小于某一特定阈值时,谱宽随初始色散或色散斜率显著变化;而当超连续谱谱宽大于此值以后,谱宽随这两个参量的变化较缓慢。并且发现色散递减曲线为凸型的光纤比色散线性递减的光纤更有利于产生宽的超连续谱;而色散递减曲线为凹型的光纤不利于形成宽的超连续谱。计算表明经过优化选择光纤的色散参量,可以得到谱宽达330 nm的超连续谱。
Based on the full-field frequency-domain equation, the generation of supercontinuum (SC) in a flattened tapered fiber is investigated. The results show that the initial dispersion and the dispersion slope of the flattened tapered fiber have an important influence on the supercontinuum generation. When the supercontinuum width is less than a certain threshold, the spectral width changes significantly with the initial dispersion or dispersion slope. After the continuous spectral width is wider than this value, the spectral width changes slowly with these two parameters. And it is found that the dispersion decreasing curve is convex, the fiber is more advantageous than the linearly decreasing fiber than the dispersion, and the dispersion decreasing curve concave is not conducive to the formation of wide supercontinuum. The calculated results show that the optimal dispersion of the optical fiber can be obtained and the supercontinuum with a spectral width of 330 nm can be obtained.