Fiber-optic UTC(k) timescale distribution with automated link delay cancelation.

In this paper we describe the idea and practical realization of an automated calibrator of fiber-optic UTC(k) distribution system, along with a high-resolution shifter of 1 PPS signal, which allows to cancel to the propagation delay and thus to produce the 1 PPS at the remote system output with practically zeroed offset. The solution was experimentally verified with ten different optical paths, up to 300 km long. The rms offset of the output timescale in our experiments was 7.1 ps, and maximum absolute value did not exceed 15 ps.