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  3. Dispersive-wave-agile Optical Frequency Division.
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  3. Dispersive-wave-agile Optical Frequency Division.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Dispersive-wave-agile optical frequency division.

Qing-Xin Ji1, Wei Zhang2, Anatoliy Savchenkov2

  • 1T. J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA USA.

Nature Photonics
|June 9, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

This study demonstrates a novel two-point optical frequency division (2P-OFD) microwave signal source using a microcomb. This advanced technique achieves record-low phase noise, enabling high-performance, compact signal generation.

Keywords:
Frequency combsMicrowave photonics

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Area of Science:

  • Physics
  • Optical Engineering
  • Signal Processing

Background:

  • Optical cavities and atomic transitions offer exceptional frequency stability.
  • Optical frequency division leverages this stability for electronic frequency scales.
  • Two-point optical frequency division (2P-OFD) simplifies system architecture and reduces power needs.

Purpose of the Study:

  • To demonstrate a 2P-OFD microwave signal source with record-low phase noise.
  • To utilize a microcomb and a high-Q optical cavity for enhanced performance.
  • To advance integrable microcomb-based signal sources.

Main Methods:

  • Employed a microcomb to define spectral endpoints for 2P-OFD.
  • Utilized a frequency-agile single-mode dispersive wave from a microcomb soliton.
  • Integrated a compact, all-solid-state optical cavity with a record Q factor.

    • Main Results:

    • Achieved a 2P-OFD microwave signal source with record-low phase noise.
    • Demonstrated a simplified system architecture without self-referencing the frequency comb.
    • Showcased a hybridly packaged system with excellent long-term stability.

    Conclusions:

    • The developed 2P-OFD system significantly reduces phase noise in microwave signal generation.
    • Microcomb-based 2P-OFD offers a pathway to high-performance, compact signal sources.
    • This technology bridges the performance gap between large microwave sources and integrable systems.