色散振荡光纤中振荡参数对增益边带的影响

Influence of the Oscillating Parameter on Gain Sidebands in Dispersion Oscillating Fiber

在色散振荡光纤中,研究平均色散、色散振荡周期和色散振荡振幅对准连续泵浦波输出调制不稳定性增益边带的影响。结果表明:随着平均色散和色散振荡周期的增加,各阶边带中心向频谱的中心频率移动,并且相对应的增益值逐渐减小。特别地,当色散振荡周期以整数增加时,在一定频谱范围内,会出现对称不等增益边带组。然而,增强色散振荡振幅,各阶边带中心频率并不发生改变,此时各阶边带增益出现振荡周期性的减小,边带出现分裂和消失的现象。同时,利用解析公式对离散增益边带进行理论预测,讨论解析公式的适用性。

The influence of the average dispersion,the period and amplitude of the dispersion oscillation on the output sidebands of the quasi-continuous pump wave induced by modulation instability in dispersion oscillating fiber is investigated.The results show that the central frequency of the sidebands is shifted to the central spectrum and the gain of the sidebands decreases as a function of the average dispersion and the period of the dispersion fluctuation.In particular,as the period of the dispersion fluctuations becomes larger in integer,the amount of unequal and symmetric gain sidebands group increases in a certain spectral range.However,the central frequency of the sidebands does not change and the gain of the sidebands periodically decreases as a function of the amplitude of the dispersion fluctuations,the emergence of the sideband splitting and vanishing is observed.In the meanwhile,the applicability of analytical expressions for applying to forecast discrete gain sidebands is discussed.