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进行了基于光纤预啁啾和自相位调制的多模/单模组合式全光纤啁啾谱压缩研究.提出利用多模光纤模式估计群速度色散均值的方法,并将该估计值作为啁啾参量分析的计算参数,仿真计算了50/125μm折射率渐变多模光纤的群速度色散均值及其与单模光纤在不同长度比值下的光谱压缩效果.采用三种折射率渐变多模光纤进行实验,对比分析了折射率渐变多模光纤的芯径大小及其与单模光纤的长度比值对光谱压缩效果的影响.实验结果表明使用50/125μm折射率渐变多模光纤获得光谱最大压缩比为5.796,谱宽为2.243 nm,与理论仿真一致;使用105/125μm折射率渐变多模光纤,可进一步提高压缩比至152.941,输出谱宽为0.085 nm的光脉冲.将此脉冲用于相干反斯托克斯拉曼散射光谱探测,理论光谱分辨率可达1.386 cm~(-1).
A multi-mode / single-mode combined full-fiber chirped spectral compression based on pre-chirp and self-phase modulation of optical fiber is presented. A method of estimating the average dispersion of the group velocity using the multimode fiber mode is proposed and used as the chirp parameter Based on the calculated parameters, the average of group velocity dispersion of 50/125 μm graded index multimode fiber and its spectral compression effect with single-mode fiber at different length ratios are simulated. Three types of graded index multimode fiber are used in experiment, The influence of the core diameter and the length ratio of single-mode fiber to the spectral compression of the graded index multi-mode fiber is compared and analyzed.The experimental results show that the maximum spectral compression ratio obtained with 50 / 125μm graded index multimode fiber is 5.796, The spectral width is 2.243 nm, which is consistent with the theoretical simulation. With 105 / 125μm graded index multimode fiber, the optical pulse with a compression ratio of 152.941 and an output spectral width of 0.085 nm can be further improved. Sman spectroscopy detection, the theoretical spectral resolution of up to 1.386 cm -1.