$10^{-17}$在32km光纤中的相干光相位传输
Coherent optical phase transfer over a 32-km fiber with 1-s instability at $10^{-17}$
摘要：
在长度超过30 km的主动稳定光纤网络上完全保持超稳定光学频率基准的相位相干性。对于安装在城市环境中的7 km链路，传输不稳定性为1 s时的$6 \times 10^{-18}$。在8 mHz至25 MHz范围内积分的0.15 rad过量相位噪声产生0.085 fs的总定时抖动。一条32公里长的链路可以达到类似的性能。在相干传输光纤链路的每一端使用频率梳，两个独立的超稳定激光器之间的外差拍频，相隔3.5 km和163 THz，实现了1 Hz的线宽。
英文摘要：
The phase coherence of an ultrastable optical frequency reference is fully maintained over actively stabilized fiber networks of lengths exceeding 30 km. For a 7-km link installed in an urban environment, the transfer instability is $6 \times 10^{-18}$ at 1-s. The excess phase noise of 0.15 rad, integrated from 8 mHz to 25 MHz, yields a total timing jitter of 0.085 fs. A 32-km link achieves similar performance. Using frequency combs at each end of the coherent-transfer fiber link, a heterodyne beat between two independent ultrastable lasers, separated by 3.5 km and 163 THz, achieves a 1-Hz linewidth.
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