Delay compensation of 1 PPS timetags in fiber-optic time distribution

In various fiber-optic time and frequency distribution systems the delay of 1 PPS timetags is stabilized and precisely calibrated. However in a case of long fiber path the 1 PPS signal is seriously delayed in respect to UTC, which is cumbersome in various applications. In this work we present an idea and experimental evaluation of a circuit designed for compensating this delay. The compensation up to 1 s may be introduced in 10 ns steps, and the standard uncertainty of the compensation is app. 550 fs.

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