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Updated: Jun 22, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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THz-bandwidth tunable slow light in semiconductor optical amplifiers.

F G Sedgwick, Bala Pesala, Jui-Yen Lin

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    Researchers achieved tunable 250% fractional delays for ultrashort pulses in a semiconductor optical amplifier. This significant optical delay is electrically tunable by adjusting amplifier current.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Semiconductor Physics

    Background:

    • Semiconductor optical amplifiers (SOAs) are crucial for optical signal processing.
    • Achieving large optical delays is essential for various photonic applications.
    • Understanding pulse propagation dynamics in SOAs is key to controlling optical parameters.

    Purpose of the Study:

    • To investigate and report tunable fractional delays in semiconductor optical amplifiers.
    • To explore the underlying physical mechanisms responsible for large fractional delays.
    • To demonstrate electrical tunability of these optical delays.

    Main Methods:

    • Utilized 700 fs pulses propagating through a 1.55 µm semiconductor optical amplifier at room temperature.
    • Analyzed pulse propagation dynamics and spectral characteristics.

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    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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  • Employed electrical current adjustment to tune the generated fractional delay.

    • Main Results:

    • Achieved a tunable fractional delay of 250% for the optical pulses.
    • Attributed the large delay to a spectral hole created by short-duration pulses (shorter than carrier heating relaxation time).
    • Demonstrated electrical tunability of the delay by adjusting the amplifier current with minimal amplitude variation.

    Conclusions:

    • Tunable, large fractional optical delays are achievable in semiconductor optical amplifiers.
    • The phenomenon is linked to pulse-induced spectral hole burning and carrier dynamics.
    • Electrical control offers a practical method for tuning optical delays in photonic systems.