Fiber Radio Frequency Transfer Using Bidirectional Frequency Division Multiplexing Dissemination

Abstract

We report on the realization of a novel fiber-optic radio frequency (RF) transfer scheme with the bidirectional frequency division multiplexing (FDM) dissemination technique.Here, the proper bidirectional frequency map used in the forward and backward directions for suppressing the backscattering noise and ensuring the symmetry of the bidirectional transfer RF signals within one telecommunication channel. We experimentally demonstrated a 0.9 GHz signal transfer over a 120 km optical link with the relative frequency stabilities of 2.2 × 10 −14 at 1 s and 4.6 × 10 −17 at 20,000 s. The implementation of phase noise compensation at the remote site has the capability to perform RF transfer over a branching fiber network with the proposed technique as needed by large-scale scientific experiments.

Multiple-access relay stations for long-haul fiber-optic radio frequency transfer

“…Compared with the satellite-based ones, the optical fiber is considered as an ideal medium for breaking the existing technological bottleneck and realizing high-precision and long-distance frequency transfer due to the advantage of low attenuation, wide bandwidth, immunity to electromagnetic interference, etc [7]. In the past two decades, various excellent fiber-optic RF transfer schemes have been successively proposed and demonstrated [8][9][10][11][12][13][14][15][16].…”