Fiber-based multipoint dissemination of radio frequency in tree topology

In this paper, a scheme is proposed to achieve multipoint dissemination of radio frequency in fiber optic network with tree topology. The phase changes of the frequency signal are canceled at the remote end by a passive phase conjugation scheme, which makes it feasible to build a tree-topology dissemination network with high cost effectiveness and flexibility. In the proof-of-concept experiment, a 50 km point-to-point 1 GHz frequency delivery link is first established with fractional instability of 5.96×10^-17 for 20000 s averaging time. Then another branch is connected to the local end by fiber spool of 38.5 km to test multipoint dissemination performance. Respective fractional instability of 7.41×10^-17 and 4×10^-17 at 20000 s averaging time shows that this simple and effective scheme is free of mutual interference on multipoint-accessed condition and able to construct a flexible radio frequency dissemination network.