光纤链路中高精度光学频率传递对光钟比对有重要意义, 双向掺铒光纤放大器(EDFA)有助于在长距离光学频率传递中对信号进行损耗补偿和高精度传输。基于铒粒子受激放大的基本原理, 设计了可用于光纤光学频率传递链路中的低噪声、高增益双向EDFA, 并对其参数进行了仿真优化。实验结果表明, 该双向EDFA的噪声指数为3.86 dB, 增益为20.14 dB, 引入的相位噪声在频率为1 Hz处仅为0.1 rad2/Hz。将该双向EDFA作为放大补偿器件应用于200 km光纤光学频率传递链路中, 获得了3.8×10-16/s的秒级频率稳定度及2.8×10-19/(104 s)的万秒级频率稳定度, 在频率信号传递和光钟比对领域有着广阔的应用前景。

High precision optical frequency transfer in fiber link is of great significance to optical clock comparison. Bidirectional Er-doped fiber amplifier (EDFA) contributes to loss compensation and high precision transmission of signal in long distance optical frequency transfer. Based on the basic principle of stimulated amplification for erbium particles, a bidirectional EDFA with low noise and high gain which can be used in fiber optical frequency transfer link is designed, and its parameters are simulated and optimized. Experimental results show that the noise index and the gain of the bidirectional EDFA is 3.86 dB and 20.14 dB, respectively. The phase noise introduced is only 0.1 rad2/Hz at the frequency of 1 Hz. The bidirectional EDFA is used as an amplified compensation device in 200 km fiber optical frequency transfer link, and a second frequency stability of 3.8×10-16/s and a ten-thousand second frequency stability of 2.8×10-19/(104 s) are obtained. It has broad application prospects in the field of frequency signal transfer and optical clock comparison.