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Physics > Optics
Title: Dual-comb-enhanced microwave clock synchronization over commercial fiber
(Submitted on 15 Apr 2024)
Abstract: The large-scale clock network is the key ingredient to obtain high precision in many scenarios, from fundamental research to cutting-edge applications. However, time synchronization among microwave clocks has become an upper limit of the time-frequency network because of the inherent constrained precision in optical pulse measurements. Here, we demonstrate a femtosecond-level time synchronization of microwave clocks through a commercial link of 205.86 km via dual-comb-enhanced optical two-way time transfer, which achieves a 6.23-fs residual time deviation between synchronized timescales at 1 s and an instability below 6E-18 at 10,000 s. Further, the high-precision time synchronization of microwave clocks significantly enhances the probe ability of subtle reciprocity changes of fiber to the sub-picosecond level. This work provides a path toward secure fiber time-frequency networks to support future microwave-clock-based precise timing and sensing systems.
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