Dual-comb-enhanced microwave clock synchronization over commercial fiber
arXiv:2404.09535 · doi:10.1364/OPTICA.530224
Abstract
The large-scale clock network is the key ingredient to obtain high precision in many scenarios, from fundamental research to cutting-edge applications. The advantage of the time synchronization among microwave clocks is their cost, size, and accessibility. 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.
11 pages, 4 figures
References in corpus (21)
- Hunting for topological dark matter with atomic clocks
- A clock network for geodesy and fundamental science
- Optical two-way time and frequency transfer over free space
- Progress in Atomic Fountains at LNE-SYRTE
- Test of special relativity using a fiber network of optical clocks
- Synchronization of Distant Optical Clocks at the Femtosecond Level
- Sub-femtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers
- Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks
- 113 km Free-Space Time-Frequency Dissemination at the 19th Decimal Instability
- Time transfer through optical fibers over a distance of 73 km with an uncertainty below 100 ps
- Quantum-limited optical time transfer for future geosynchronous links
- Femtosecond Synchronization of Optical Clocks Off of a Flying Quadcopter
- Point-to-Point Stabilised Optical Frequency Transfer with Active Optics
- Free-space transfer of comb-rooted optical frequencies over an 18 km open-air link
- Towards satellite-based quantum-secure time transfer
- Comparing optical oscillators across the air to milliradians in phase and in frequency
- Ultra-stable Free-Space Laser Links for a Global Network of Optical Atomic Clocks
- Requirements for Secure Clock Synchronization
- Asymmetric delay attack on an entanglement-based bidirectional clock synchronization protocol
- Time-interval Measurement with Linear Optical Sampling at the Femtosecond Level
- Hundred-Femtosecond-Level Concise Optical Time Delay Measurement System Based on Linear Optical Sampling