Coherent Transfer of Optical Frequency over 112km with Instability at the 10$^{-20}$ Level
Xue Deng1,3, Jie Liu1,2,3, Dong-Dong Jiao1,3, Jing Gao1,3, Qi Zang1,2,3, Guan-Jun Xu1,3, Rui-Fang Dong1,3, Tao Liu1,3**, Shou-Gang Zhang1,3
1National Time Service Centre, Chinese Academy of Sciences, Xi'an 710600 2University of Chinese Academy of Sciences, Beijing 100049 3Key Laboratory of Time and Frequency Standards, Chinese Academy of Sciences, Xi'an 710600
Abstract：We demonstrate optical-carrier transfer over a 112-km single-span urban fiber link. By actively compensating the phase noise induced along the fiber link, a noise suppression of 55 dB at 1 Hz is obtained. A fractional frequency instability of $2.5\times10^{-16}$ at 1 s is achieved, and reaching $7.5\times10^{-20}$ at 10000 s. The system is stable and able to run for a long time. This work will contribute to optical frequency distribution and remote comparison among atomic clocks.
. [J]. 中国物理快报, 2016, 33(11): 114202-114202.
Xue Deng, Jie Liu, Dong-Dong Jiao, Jing Gao, Qi Zang, Guan-Jun Xu, Rui-Fang Dong, Tao Liu, Shou-Gang Zhang. Coherent Transfer of Optical Frequency over 112km with Instability at the 10$^{-20}$ Level. Chin. Phys. Lett., 2016, 33(11): 114202-114202.
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