对高折射率纤芯掺铒布拉格光纤放大器特性进行实验研究,测量了正向抽运、反向抽运方式下布拉格掺铒光纤放大器的小信号增益和噪声系数。实验结果表明,与普通掺铒光纤放大器相比,二者的自发辐射谱形状基本相同,但是掺铒布拉格光纤放大器的效率较低。通过对光纤模场的理论计算,分析了原因所在并提出相应的改进措施。此外,对两种光纤放大器的饱和增益特性进行了比较。当普通掺铒光纤放大器和布拉格掺铒光纤放大器工作在相同增益水平下时,与前者比,布拉格掺铒光纤放大器具有更大的输入信号动态范围,可以应用于放大器的增益控制领域。 Experimental study on the characteristics of Erbium-doped fiber Bragg fiber amplifier with high refractive index fiber core was carried out. The small-signal gain and noise figure of Erbium-doped fiber amplifier in positive and negative pump mode were measured. The experimental results show that the spontaneous emission spectra of the two are basically the same as those of the conventional erbium-doped fiber amplifier, but the efficiency of the erbium-doped fiber amplifier is relatively low. Through the theoretical calculation of optical mode field, the reason is analyzed and the corresponding improvement measures are put forward. In addition, the saturation gain characteristics of the two fiber amplifiers are compared. Compared with the former, the Erbium-doped fiber amplifier in Bragg has a larger input signal dynamic range when the common erbium-doped fiber amplifier and the Bragg erbium-doped fiber amplifier operate at the same gain level, and can be applied to the gain control of an amplifier.