Optical coherence transfer over 50-km spooled fiber with frequency instability of 2×10−17 at 1 s
Ma Chao-Qun, Li-Fei Wu, Jiang Yan-Yi†, Yu Hong-Fu, Bi Zhi-Yi, Ma Long-Sheng
       
Frequency instability measurement of the compensation system noise floor when the acrylic box is open (black solid squares) and closed (red solid circles).