Fig. 1. Diagram of the remote site compensation experimental setup. OC, optical coupler; FM, Faraday mirror; AOM, acousto-optic modulator; Bi-EDFA, bidirectional erbium-doped fiber amplifier; DDS, direct digital synthesizer; PD, photo-detector; Mixer, frequency mixer; BPF, band-pass filter; LPF, low-pass filter; TOF, tracking oscillator filter; SG, signal generator.

Fig. 2. The OADEV of the 150 km fiber transfer link at remote site compensation. The pink triangle curve shows the free-running link. The red dot and blue triangle curves show the compensated link of the 10 MHz commercial time base and rubidium clock time base, respectively. The black square curve shows the commercial 10 MHz oscillator. The green triangle curve shows the system noise floor.

Fig. 3. The phase noise PSDs of the 150 km fiber transfer link. The green curve shows the free-running link. The red and blue curves show the compensated link and the theoretical limitation, respectively.

Fig. 4. (a) The frequency deviation of the 150 km fiber transfer link. The frequency data were recorded by the frequency counter with 1 s gate time (green points, left axis). We calculated unweighted mean (Π-type) values for all cycle-slip free 500 s long segments, resulting in 51,000 data points (orange dots, right axis, enlarged scale). (b) Histograms (green bars) and Gaussian fits (green curves) for frequency values as taken with Π-type frequency counters with 1 s gate time, and orange bars and curves for 103 phase-coherent 500 s frequency averages.