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    We developed new quantum dot lasers for 1.3 µm fiber optics. High-order gratings enable stable single longitudinal mode operation, crucial for telecommunications.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Quantum Dot Technology

    Background:

    • Quantum dot lasers offer potential for telecommunications due to their unique properties.
    • Achieving single longitudinal mode (SLM) operation is critical for high-speed data transmission.
    • Fabry-Perot lasers often exhibit multimode behavior, limiting their application.

    Purpose of the Study:

    • To design, fabricate, and characterize InAs/GaAs quantum dot lasers for the 1.3 µm communication band.
    • To investigate the impact of surface gratings on achieving single longitudinal mode lasing.
    • To optimize laser performance for stable single-mode operation.

    Main Methods:

    • Fabrication of Fabry-Perot lasers using Indium Arsenide (InAs) quantum dots on Gallium Arsenide (GaAs) substrate.
    • Integration of 35th-order surface gratings via standard photolithography to induce refractive index perturbation.
    • Characterization of laser performance, including emission wavelength, mode stability, and side-mode suppression ratio.

    Main Results:

    • Successfully demonstrated single longitudinal mode (SLM) operation in InAs/GaAs quantum dot lasers at 1.3 µm.
    • The 35th-order surface grating effectively reduced mirror loss at the target wavelength.
    • Stable single-mode operation was achieved across an injection current range of 45-100 mA.
    • A high side-mode suppression ratio (SMSR) of up to 33 dB was recorded.

    Conclusions:

    • Surface gratings are an effective method for achieving single longitudinal mode operation in quantum dot lasers.
    • These lasers are suitable for 1.3 µm fiber optic communication applications.
    • The demonstrated performance highlights the potential of quantum dot lasers for next-generation optical networks.