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在小信号条件下,结合相位补偿,推导了四波混频耦合方程.得出了级联光纤参量放大器(CFOPA)的理论输出增益和相位表达式,借以对CFOPA带宽增益特性进行分析,并与单段光纤参量放大器(SFOPA)相关特性做了比较。分段数N=10时。CFOPA的3 dB带宽可以达到67.2 nm,而SFOPA则只有12.6 nm,即通过级联增加了54.6 nm。同时,若考虑光纤损耗及级联熔接损耗后,CFOPA的3 dB带宽将保持不变,而峰值增益降低。研究表明,将色散位移光纤(DSF)进行多段级联相位补偿可有效提高其放大带宽;在DSF长度、抽运光功率或闲频光初始功率给定时,CFOPA的增益带宽较SFOPA有明显增加,且具有更好的增益平坦度。
Under small signal conditions, combined with phase compensation, the four-wave mixing coupling equation is deduced, and the theoretical output gain and phase expression of CFOPA are derived to analyze the bandwidth gain characteristics of CFOPA. Single-phase fiber parametric amplifier (SFOPA) related features were compared. Number of segments N = 10. The 3 dB bandwidth of CFOPA can reach 67.2 nm, while that of SFOPA is only 12.6 nm, which means an increase of 54.6 nm through cascading. At the same time, the 3 dB bandwidth of CFOPA will remain unchanged and the peak gain will decrease if fiber loss and cascade splice loss are taken into account. The results show that the gain bandwidth of CFOPA is obviously increased when DSF length, pump power or idler initial power are given, which is achieved by multi-stage cascaded phase compensation of DSF. And has better gain flatness.