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Related Experiment Video

Updated: Dec 25, 2025

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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Optical frequency distribution using laser repeater stations with planar lightwave circuits.

Tomoya Akatsuka, Takashi Goh, Hiromitsu Imai

    Optics Express
    |April 1, 2020
    PubMed
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    Research on Quantum Materials and Quantum Technology at RIKEN.

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    Researchers created a stable optical fiber link connecting laboratories using laser repeaters. This breakthrough enables advanced optical lattice clock networks with unprecedented precision.

    Area of Science:

    • Quantum optics
    • Optical metrology
    • Network science

    Background:

    • Optical lattice clocks require highly stable frequency transfer over long distances.
    • Existing fiber links face limitations due to environmental noise and limited bandwidth.
    • Cascaded fiber links with repeater stations offer a potential solution for enhanced stability.

    Purpose of the Study:

    • To establish a stable, long-distance optical fiber link for clock synchronization.
    • To demonstrate the feasibility of constructing optical lattice clock networks.
    • To investigate the performance of cascaded links with advanced repeater technology.

    Main Methods:

    • Development of laser repeater stations using planar lightwave circuits.
    • Implementation of a cascaded optical fiber link connecting RIKEN, the University of Tokyo, and NTT.

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    Related Experiment Videos

    Last Updated: Dec 25, 2025

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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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  • Utilizing a transfer light at 1397 nm, a subharmonic of the Sr clock frequency.
  • Employing a wide feedback bandwidth for fiber noise compensation.

    • Main Results:

    • A 240-km cascaded link was successfully implemented in a loop configuration.
    • Link instability reached 3 × 10-16 at 1 s and 1 × 10-18 at 2,600 s in high-noise environments.
    • Planar lightwave circuit-based repeaters significantly reduced interferometer noise.

    Conclusions:

    • The developed cascaded optical fiber link provides high stability for clock networks.
    • Laser repeater stations are crucial for mitigating fiber noise and improving link performance.
    • This technology enables the construction of robust optical lattice clock networks over extended regions.