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Multi-wavelength distributed feedback laser array with very high wavelength-spacing precision.

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    Precision multi-wavelength laser arrays (MLAs) were fabricated using the reconstruction-equivalent chirp technique. High wavelength accuracy was achieved, with over 81% of lasers showing deviations within ±0.1 nm.

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    Area of Science:

    • Optoelectronics and Photonics
    • Semiconductor Lasers

    Background:

    • Precise wavelength control is crucial for applications like optical communications and spectroscopy.
    • Existing multi-wavelength laser array (MLA) fabrication methods face challenges in achieving high wavelength-spacing precision.

    Purpose of the Study:

    • To design and fabricate multi-wavelength laser arrays (MLAs) with enhanced wavelength-spacing precision.
    • To investigate the effectiveness of the reconstruction-equivalent chirp (REC) technique and anti-reflection structures in minimizing wavelength deviation.

    Main Methods:

    • Utilized the reconstruction-equivalent chirp (REC) technique for MLA design and fabrication.
    • Incorporated anti-reflection structures to mitigate wavelength deviation.
    • Fabricated and statistically analyzed six MLA samples comprising 95 individual lasers.

    Main Results:

    • Achieved high wavelength-spacing precision in the fabricated MLAs.
    • 81.1% of the 95 lasers exhibited wavelength deviations within ±0.1 nm.
    • All tested lasers demonstrated wavelength deviations within ±0.2 nm, with a mean wavelength spacing of 1.605 nm and a standard deviation of 0.132 nm.

    Conclusions:

    • The REC technique combined with anti-reflection structures effectively produces MLAs with high wavelength-spacing precision.
    • The fabricated MLAs meet stringent requirements for precise wavelength control, suitable for advanced optical applications.