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Single-pass superluminescent diodes with grazing stripe waveguide.

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    Researchers developed novel InGaAs/GaAs quantum well-dot superluminescent diodes (SLDs) with a unique stripe waveguide design. This design suppresses optical feedback, significantly boosting optical power output for enhanced device performance.

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    Area of Science:

    • Semiconductor Optoelectronics
    • Quantum Dot Devices
    • Photonics Engineering

    Background:

    • Superluminescent diodes (SLDs) are crucial for applications requiring broad, high-power emission.
    • Traditional SLD designs often face challenges with optical feedback and limited output power.
    • Indium Gallium Arsenide / Gallium Arsenide (InGaAs/GaAs) quantum well-dot structures offer tunable emission properties.

    Purpose of the Study:

    • To investigate a novel and simple stripe waveguide design for InGaAs/GaAs quantum well-dot superluminescent diodes (SLDs).
    • To enhance optical power output by effectively suppressing optical feedback.
    • To characterize the emission properties of the developed SLDs in the 950-1150 nm spectral range.

    Main Methods:

    • Fabrication of InGaAs/GaAs quantum well-dot structures.
    • Implementation of a novel stripe waveguide design incorporating a chip side facet.
    • Characterization of continuous-wave (CW) optical power and emission spectra (FWHM).

    Main Results:

    • The novel stripe waveguide design effectively suppressed optical feedback.
    • Continuous-wave (CW) optical power as high as 150 mW was achieved.
    • Broad emission spectra with a 20 nm full width at half maximum (FWHM) were observed in the 950-1150 nm range.

    Conclusions:

    • The proposed simple stripe waveguide design is effective for InGaAs/GaAs quantum well-dot SLDs.
    • The design enables high optical power output and broad spectral emission.
    • This advancement holds promise for applications requiring high-performance light sources.