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Dual-wavelength distributed feedback laser based on waveguide Bragg grating microcavities.

Mohanad Jamal Al-Rubaiee, Xiao Sun, Jue Wang

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    |December 1, 2025
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    Summary
    This summary is machine-generated.

    Researchers developed a novel dual-wavelength laser. This compact, stable device operates at 1.55 µm, offering a promising platform for integrated photonics and microwave applications.

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    Area of Science:

    • Photonics
    • Semiconductor Lasers
    • Integrated Optics

    Background:

    • Simultaneous dual-wavelength operation is crucial for applications like microwave photonics.
    • Existing devices often lack compactness, stability, or require complex fabrication.
    • A single-section, single-contact laser platform is highly desirable.

    Purpose of the Study:

    • To demonstrate a new dual-wavelength distributed feedback laser platform.
    • To achieve stable, simultaneous dual-wavelength operation at 1.55 µm.
    • To establish a compact, thermally stable, and fabrication-tolerant laser solution.

    Main Methods:

    • Utilizing a waveguide Bragg grating microcavity.
    • Incorporating uniform sidewall gratings for laser design.
    • Fabrication via single metalorganic vapor-phase epitaxy growth and one dry etching step.

    Main Results:

    • Achieved the first single-section, single-contact dual-wavelength laser at 1.55 µm.
    • Demonstrated stable dual-mode operation tunable across various frequency spacings.
    • Obtained free spectral ranges from 0.41 nm to 0.65 nm (54–86 GHz).
    • Exhibited side-mode suppression ratios exceeding 30 dB.

    Conclusions:

    • The developed laser platform offers intrinsic stability and compactness.
    • The fabrication process is tolerant and enables scalable production.
    • This technology is a promising candidate for advanced microwave photonics and integrated photonic systems.