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对正向和反向抽运的L波段双通掺铒光纤放大器(EDFA)的增益改善机制进行了实验研究,比较了两种抽运方案在不同掺铒光纤(EDF)长度下的增益改善效果。结果表明,两种抽运方案的增益改善机制不同,正向抽运方案时EDF中粒子数反转度沿纵向的分布有利于信号光功率在输入输出端附近的放大,进而对抽运输入端附近的放大的自发辐射(ASE)有抑制作用;反向抽运方案则利用抽运输入端附近产生的后向C波段ASE作为辅助抽运源。反向抽运时,因反射端ASE功率过大导致了ASE引起的增益自饱和效应,使得当EDF长度较短时,其增益改善效果比正向抽运方案稍差;正向抽运方案则在EDF长度较长时出现抽运不足问题,并使得输入信号光功率较低时的增益特性变差。
The gain improvement mechanism of L-band double-pass erbium-doped fiber amplifier (EDFA) with forward and reverse pumping is experimentally studied. The gain improvement of the two pumping schemes under different EDF lengths is compared . The results show that the gain improvement mechanism of the two pumping schemes is different. The vertical distribution of particle inversion in the EDF in the forward pumping scheme is beneficial to amplify the signal light power near the input and output terminals, and then to the pump input The amplified spontaneous emission (ASE) is suppressed in the vicinity; the reverse pumping scheme uses the backward C-band ASE generated near the pump input as the auxiliary pumping source. In the case of reverse pumping, the gain self-saturation effect caused by ASE is caused by the excessive power of the ASE at the reflection end, so that when the EDF length is short, the gain improvement effect is slightly worse than that of the forward pumping scheme. In the forward pumping scheme Lack of pumping occurs when the length of the EDF is long, and the gain characteristics of the input signal with low optical power deteriorate.