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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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High-performance compact spectrometer based on multimode interference in a tapered spiral-shaped waveguide.

Fan Meng, Yue Zhao, Hui Wang

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    |December 28, 2019
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    Summary
    This summary is machine-generated.

    This study presents a compact spectrometer using multimode interference in a spiral waveguide. The device achieves high spectral resolution and broad bandwidth, enabling precise spectrum reconstruction for integrated systems.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Spectroscopy

    Background:

    • Multimode interference (MMI) patterns are sensitive to spectral components.
    • MMI can serve as a spectral fingerprint for spectrum reconstruction.
    • Existing spectrometers often lack compactness and high performance.

    Purpose of the Study:

    • To design and realize a high-performance, compact spectrometer.
    • To leverage MMI for spectral analysis.
    • To enable low-cost and multifunctional integrated optical systems.

    Main Methods:

    • Utilized a tapered spiral-shaped waveguide.
    • Integrated a detector array directly on top of the waveguide.
    • Employed multimode interference imaging from leaky modes.

    Main Results:

    • Achieved a spectral resolution of 20 pm in the visible range.
    • Covered a broad bandwidth from 545 to 725 nm.
    • Successfully reconstructed spectra of narrow lines and synthesized broadband signals.
    • Demonstrated high performance in a compact 250 µm radius structure.

    Conclusions:

    • The developed compact spectrometer offers high resolution and broad bandwidth.
    • The device effectively reconstructs spectral information using MMI.
    • This technology is poised for significant impact in low-cost, multifunctional integrated systems.