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Superefficient microcombs at the wafer level.

Marcello Girardi, Óskar B Helgason, Carmen H López-Ortega

    Optics Express
    |August 13, 2025
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    Summary
    This summary is machine-generated.

    Wafer-scale soliton microcombs achieve over 50% conversion efficiency, enabling chip-scale frequency combs for integrated photonics. This breakthrough supports applications in navigation, data centers, and advanced sensing technologies.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Microwave Photonics

    Background:

    • Chip-scale frequency combs are crucial for integrated photonic systems, offering massive wavelength parallelization.
    • Current efficient solutions are limited to the die level, hindering scalable manufacturing.
    • Potential applications include advanced navigation, data center interconnects, and ranging systems.

    Purpose of the Study:

    • To report wafer-level characterization of soliton microcombs.
    • To demonstrate high conversion efficiency and stable repetition rates at the wafer scale.
    • To explore novel sensing applications enabled by wafer-level redundancy and multi-comb interferometry.

    Main Methods:

    • Wafer-level fabrication and characterization of soliton microcombs.
    • Measurement of conversion efficiency, line count, and repetition rate stability.
    • Development and demonstration of tri-comb interferometry for spectroscopy.

    Main Results:

    • Achieved average conversion efficiency exceeding 50% across the wafer.
    • Generated 100 optical lines with a 100 GHz repetition rate and 20 MHz standard deviation.
    • Demonstrated tri-comb interferometry for broadband phase-sensitive spectroscopy.

    Conclusions:

    • Wafer-level soliton microcombs offer a scalable and efficient solution for integrated photonics.
    • The demonstrated performance enables practical applications in communications, sensing, and metrology.
    • Wafer-level redundancy opens new avenues for advanced sensing modalities like phase-sensitive spectroscopy.