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研究了皮秒抽运脉冲在正常色散平坦光纤中超连续谱的形成过程,分析了脉冲演化过程中光波分裂的产生及其所显示的四波混频对超连续谱特性的影响.结果表明:脉冲初期光谱展宽由自相位调制效应主导,此后由于光谱中心区域能量在色散作用下不断向旁瓣转移,自相位调制效应逐渐减弱而四波混频作用增强,光谱会再度显著展宽.超连续谱的噪声特性与光谱演化状态密切相关,是光谱特征结构对抽运脉冲强度噪声响应的动态表征.
The formation process of supercontinuum in picosecond flattened fiber is studied, and the generation of light wave splitting and the effect of the four-wave mixing on the supercontinuum characteristics are analyzed.The results show that the pulse The initial spectrum broadening is dominated by the self-phase modulation effect, and then the spectrum widens again due to the energy transfer from the central phase to the sidelobe due to dispersion in the central region of the spectrum, the gradual decrease of the self-phase modulation effect and the enhancement of the four-wave mixing effect. The noise characteristic is closely related to the evolution of the spectrum, and is a dynamic characterization of the spectral feature of the pump response to the intensity of the pump pulse.