Microwave Frequency Dissemination at NTSC

We report on a demonstration of a long-distance microwave frequency dissemination, in which the so-called Doppler cancellation technique is used to compensate the optical link phase noise. The 10-GHz signal is transferred through a 50km optical fiber spool with fractional frequency instability of $8.1 \times 10^{-15}$ at 1-s integration time and $1.7 \times 10^{18}$ at 8192-s integration time.