Passive-Compensation-Based Stable RF Phase Dissemination for Multiaccess Trunk Fiber Link With Anti-GVD and Anti-Backscattering Function

We propose and demonstrate a scheme of stable radio frequency (RF) phase dissemination for multiaccess trunk fiber link by passive frequency mixing with anti-group velocity dispersion (GVD) and anti-backscattering function. The propagation delay of the entire fiber link is detected by a round-trip probe signal. After converting the frequency of the precompensated signal to the same frequency as the backward probe signal, the phase drifts can be eliminated automatically by frequency mixing at an arbitrary receiving node. Signals with different radio frequencies at the same wavelength are employed in the forward and backward transmissions to efficiently suppress the effect of the GVD and Rayleigh backscattering at the same time. In the experiment, a 2.4-GHz RF signal is delivered through a 50.2-km single mode fiber with autophase correction. The residual phase jitter of the recovered signals is no more than 0.031 rd at two points along the trunk fiber link.