  We report on the realization of delivering coherent optical frequency to
multiple places based on passive phase noise cancellation over a bus topology
fiber network. This technique mitigates any active servo controller on the main
fiber link and at arbitrary access places as opposed to the conventional
technique, in which an active phase compensation circuit has to be adopted to
stabilize the main fiber link. Although the residual fiber phase noise power
spectral density (PSD) in the proposed technique turns out to be a factor of 7
higher than that of in the conventional multiple-access technique when the
access place is close to the end of the fiber link, it could largely suppress
the phase noise introduced by the servo bumps, improve the response speed and
phase recovery time, and minimize hardware overhead in systems with many
stations and connections without the need of the active servo circuits
including phase discriminators and active compensators. The proposed technique
could considerably simplify future efforts to make precise optical frequency
signals available to many users, as required by some large-scale science
experiments.
