Joint transfer of time and frequency signals and multi-point synchronization via fiber network

Cheng Nan¹, Chen Wei¹, Liu Qin², Xu Dan¹, Yang Fei¹, Gui You-Zhen^{2, †,}, Cai Hai-Wen^{1, ‡,}

Schematic diagram of the frequency transfer and time synchronization system via 110 km fiber link. PS: polarization scrambler; CFDL: controlled fiber delay line; Bi-EDFA: bi-directional erbium-doped fiber amplifier; PA: phase analysis system; PID: proportional-integral-differential system; PDA: pulse distribution amplifier; DWDM: dense wavelength division multiplex; TIC: time interval counter.