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本文描述了一套自行搭建的光纤相位噪声抑制系统，通过环外自拍频测量得到的噪声本底秒级稳定度为 6.8×10-18，2000 s 平均时间后达到 2.3×10-19。利用该系统实现 1.6 km 实际光纤链路的传输，传输后环外自拍频信号秒级稳定度达 1.2×10-17。基于连接两个实验室的 808 m 实际光纤链路，将此系统应用于两套商品 1.5 μ m 超稳激光系统的比对，通过拍频测量获得单台激光系统的线宽 0.54±0.15 Hz，秒级频率稳定度为 1.2×10-15。
This paper describes a set of self-built fiber-optic phase-noise suppression system. The noise floor second-order stability obtained by out-of-loop self-beat frequency measurement is 6.8 × 10-18, and the average time after 2000s reaches 2.3 × 10-19. The system realizes the transmission of the actual optical fiber link with a length of 1.6 km. After the transmission, the second-level stability of the self-beat signal outside the loop reaches 1.2 × 10-17. Based on the 808 m actual optical fiber link connecting the two laboratories, the system was applied to the comparison of two 1.5 μ m ultrastable laser systems on a commercial product. The linewidth of a single laser system was measured by beat frequency measurement at 0.54 ± 0.15 Hz, The second-level frequency stability is 1.2 × 10-15.