Hong F-L, Musha M, Takamoto M, Inaba H, Yanagimachi S, Takamizawa A, Watabe K, Ikegami T, Imae M, Fujii Y, Amemiya M, Nakagawa K, Ueda K, Katori H
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technologies, Tsukuba, Ibaraki, Japan.
Opt Lett. 2009 Mar 1;34(5):692-4. doi: 10.1364/ol.34.000692.
We demonstrate a precision frequency measurement using a phase-stabilized 120 km optical fiber link over a physical distance of 50 km. The transition frequency of the (87)Sr optical lattice clock at the University of Tokyo is measured to be 429228004229874.1(2.4) Hz referenced to international atomic time. The results demonstrate the excellent functions of the intercity optical fiber link and the great potential of optical lattice clocks for use in the redefinition of the second.
我们展示了一种在50公里实际距离上利用相位稳定的120公里光纤链路进行的精密频率测量。以国际原子时为参考，测量出东京大学（87）Sr光晶格钟的跃迁频率为429228004229874.1(2.4)赫兹。结果证明了城市间光纤链路的卓越功能以及光晶格钟在重新定义秒方面的巨大潜力。
