  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
2.2E-14 at 1 s and 4.6E-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.
