有源光纤环路脉冲复制特性的研究

Research on the pulse replication performance of active fiber loops

理论分析和实验验证了一种提高有源光纤环路脉冲复制性能的解决方案。首先,经过理论分析推导出决定脉冲复制性能的主要参数是光放大器增益的动态特性。其次,理论分析得出通过改变环路衰减,利用光纤环路内的放大自发辐射噪声光信号调整光放大器工作状态,减小光放大器增益的动态范围。最后,通过实验测量复制脉冲序列波形,验证了光放大器工作在深度饱和状态可以提高有源光纤环路脉冲复制的性能。并且通过实验测量光纤环路光谱,进一步分析证明光放大器饱和状态是指相应频带的饱和。因此使用光滤波器对光纤环路频带进行限制是非常必要的。

A scheme of improving pulse replication performance of active fiber loops is analyzed theoretically and is proven experimentally.Firstly,the pulse replication performance confined by the dynamic features of optical amplifiers′ gain is deduced through theoretical analysis.Secondly,the working state is set by ASE noise through adjusting the loop attenuation in order to decrease the dynamic range of the gain.At last,it is proven by experiments that the deep saturation state of the optical amplifiers can improve the pulse replication performance.Further study indicates that the saturation state of the optical amplifiers means the saturation in the corresponding frequency band.So,it is prerequisite for the loop to use an optical filter with proper frequency features.