Field Trial of Stable Radio Frequency Transfer System in 100 km Metropolitan Optical Fiber Link

Abstract

We report on a stable radio frequency (RF) transfer experiment via 100 km metropolitan optical fiber link in Beijing area. The link connecting Daniufang and Fangzhuang is composed of two parallel 50-km dark optical fibers with a total loss of 31 dB. The dual phase locked loops (dual-PLL) configuration is designed in our stable fiber-optic RF transfer system. The measured fractional frequency stability (ADEV) of 2.4 GHz RF signal transmission system approaches $1.7\times 10^{-14} @1 \mathrm{s}$ and $2.5\times 10^{-17} @10000\ \mathrm{s}$.