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Coherent control in quantum dot gain media using shaped pulses: a numerical study.

Akhilesh Kumar Mishra, Ouri Karni, Gadi Eisenstein

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    We numerically studied coherent control in quantum dot semiconductor optical amplifiers using shaped ultra-short pulses. Quadratic spectral phase modulation controls gain and absorption, enabling pulse compression or broadening.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Physics
    • Quantum Information Science

    Background:

    • Semiconductor optical amplifiers (SOAs) are key components in optical communications.
    • Quantum dots (QDs) offer unique optical properties for advanced functionalities.
    • Coherent control using shaped ultra-short pulses is a powerful technique for manipulating light-matter interactions.

    Purpose of the Study:

    • To numerically investigate coherent control in InAs/InP quantum dot SOAs at room temperature.
    • To analyze the influence of shaped ultra-short pulses on both gain and absorption regimes.
    • To explore the role of quadratic spectral phase (QSP) in controlling coherent interactions.

    Main Methods:

    • Numerical simulation of coherent control dynamics.
    • Analysis of ultra-short pulse propagation through a QD SOA.
    • Investigation of gain and absorption regimes with varying pulse spectral properties.

    Main Results:

    • Coherent interactions in the gain regime are controllable via QSP, affecting spectral component interactions.
    • QSP can suppress or enhance coherent signatures based on spectral proximity to the gain peak.
    • In the absorption regime, QSP influences pulse chirp, leading to either compression (positive QSP) or broadening (negative QSP).

    Conclusions:

    • Shaped ultra-short pulses offer precise control over QD SOA behavior.
    • QSP is an effective tool for tailoring optical amplification and pulse shaping.
    • This study provides insights for designing advanced optical devices based on QD SOAs.