  In this paper, we demonstrate a wavelength division multiplexing (WDM) based
system for simultaneously delivering ultrastable optical frequency reference,
10 GHz microwave frequency reference, and one pulse per second (1 PPS) time
signal via a 50 km fiber network. For each signal, a unique noise cancellation
technique is used to maintain the precision of them. After being compensated,
the transfer frequency instability in terms of overlapping Allan deviation
(OADEV) for the optical frequency achieves 2E-17/s and scales down to
2E-20/10000 s, which for the 10 GHz microwave reference approaches 4E-15/s and
decreases to 1.4E-17/10000 s, and the time uncertainty of the 1 PPS time signal
along the system is 2.08 ps. In this scheme, specific channels of WDM are
respectively occupied for different signals to avoid the possible crosstalk
interference effect between the transmitted reference signals. To estimate the
performance of the above scheme, independent of these signals is also
demonstrated in this 50 km link, the results are similar to that in the case of
simultaneous delivery. This work shows that the WDM-based system is a promising
method for building a nationwide time and frequency fiber transfer system with
a communication optical network.
