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InAs/InGaAs Quantum Dot Lasers on Multi-Functional Metamorphic Buffer Layers.

Jinkwan Kwoen, Takaya Imoto, Yasuhiko Arakawa

    Optics Express
    |October 7, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel E-band InAs quantum dot (QD) laser on a GaAs substrate. This high-performance semiconductor light source overcomes material constraints for next-generation telecommunications.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Physics
    • Telecommunications Engineering

    Background:

    • The E-band (120-160 GHz) is a promising telecommunication wavelength due to dry fiber development.
    • High-performance semiconductor light sources for the E-band are limited by material constraints.
    • Indium Arsenide (InAs) quantum dot (QD) lasers on Gallium Arsenide (GaAs) substrates show potential for O-band applications due to thermal properties and efficiency.

    Purpose of the Study:

    • To fabricate a high-performance E-band InAs QD laser on a GaAs substrate.
    • To overcome the performance degradation caused by thick metamorphic buffer layers in previous E-band laser designs.
    • To develop a multifunctional buffer layer integrating cladding, metamorphic, and dislocation filtering functions.

    Main Methods:

    • Fabrication of an E-band InAs/GaAs QD laser using an AlInGaAs multifunctional metamorphic buffer layer.
    • The buffer layer integrates the functions of a metamorphic buffer, a dislocation filter, and a bottom cladding layer of normal thickness.
    • Characterization of laser performance under continuous-wave (CW) operation at room temperature.

    Main Results:

    • Demonstration of lasing oscillation at a wavelength of 1428 nm.
    • Successful room temperature continuous-wave (CW) operation achieved.
    • The AlInGaAs multifunctional metamorphic buffer layer effectively addresses material constraints and performance degradation issues.

    Conclusions:

    • The developed AlInGaAs multifunctional metamorphic buffer layer is crucial for realizing high-performance E-band InAs QD lasers.
    • This advancement paves the way for highly efficient semiconductor light sources for E-band telecommunications.
    • The study highlights a significant step towards practical E-band optical communication systems.