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Fiber-optic joint time and frequency transmission with enhanced time precision
Optics Letters
|February 15, 2022
Summary
This study presents a novel method for high-precision joint time and frequency transmission over optical fiber. The system achieves enhanced time stability and accuracy, crucial for advanced communication networks.
Area of Science:
- Optical communications
- Precision timing systems
Background:
- Accurate time and frequency transfer are critical for modern networks.
- Existing methods face limitations in stability and precision over long distances.
Purpose of the Study:
- To develop a high-precision joint time and frequency transmission scheme.
- To achieve enhanced time stability and accuracy using optical fiber links.
Main Methods:
- Utilized bidirectional wavelength division multiplexing (WDM) for transmission.
- Generated time signals from phase-stable frequency signals using a low-jitter event generator.
- Implemented accurate two-way time comparison for master-slave synchronization.
Main Results:
- Demonstrated a joint time and frequency transmission system over a 62-km urban fiber link.
- Achieved time stability with Time Deviation (TDEV) of 3.5 ps/s.
- Realized time accuracy better than 20 ps, with long-term stability of 430 fs/10,000 s.
Conclusions:
- The proposed scheme enables high-precision time and frequency transfer.
- The system offers enhanced time stability and accuracy suitable for demanding applications.
- Successful experimental validation confirms the scheme's practical feasibility.
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