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Sub-ps resolution clock-offset measurement over a 114 km fiber link using linear optical sampling.

Abulikemu Abuduweili, Xing Chen, Ziyang Chen

    Optics Express
    |December 31, 2020
    PubMed
    Summary

    We achieved sub-picosecond resolution clock-offset measurements using linear optical sampling over a 114 km fiber link. This breakthrough benefits precise time synchronization in long-distance applications.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Telecommunications Engineering

    Background:

    • Accurate time synchronization is crucial for modern communication networks and scientific experiments.
    • Existing methods for clock-offset measurement over long fiber links face limitations in resolution and stability.

    Purpose of the Study:

    • To demonstrate a novel method for high-resolution clock-offset measurement.
    • To achieve sub-picosecond resolution in time deviation measurements over a 114 km fiber link.

    Main Methods:

    • Utilizing a linear optical sampling technique.
    • Employing a dual optical frequency comb transferred over a 114 km optical fiber link.

    Main Results:

    • Achieved a time deviation of 110 fs at 1 s averaging and 22 fs at 100 s averaging.

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  • Measured a standard deviation of clock offset at 237 fs.
  • Demonstrated sub-picosecond resolution clock-offset measurement capability.

    • Conclusions:

    • The developed method offers unprecedented sub-picosecond clock-offset measurement resolution.
    • This technique is highly promising for enhancing time synchronization in long-haul fiber optic systems.
    • The results pave the way for advancements in distributed timing applications.