  We report a technique for coherence transfer of laser light through a fiber
link, where the optical phase noise induced by environmental perturbation via
the fiber link is compensated by remote users with passive phase noise
correction, rather than at the input as is conventional. Neither phase
discrimination nor active phase tracking is required due to the open-loop
design, mitigating some technical problems such as the limited compensation
speed and the finite compensation precision as conventional active phase noise
cancellation. We theoretically analyze and experimentally demonstrate that the
delay effect introduced residual fiber phase noise after noise compensation is
a factor of 7 higher than the conventional techniques. Using this technique, we
demonstrate the transfer laser light through a 145-km-long, lab-based spooled
fiber. After being compensated, the relative frequency instability in terms of
overlapping Allan deviation is 1.9E-15 at 1s averaging time and scales down
5.3E-19 at 10,000 s averaging time. The frequency uncertainty of the light
after transferring through the fiber relative to that of the input light is
-0.36+-2.6E-18. As the transmitted optical signal remains unaltered until it
reaches the remote sites, it can be transmitted simultaneously to multiple
remote sites on an arbitrarily complex fiber network, paving a way to develop a
multi-node optical frequency dissemination system with post automatic phase
noise correction for a number of end users.
