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Phase-change material-assisted all-optical temporal differentiator.

Pengxing Guo, Sijing Yu, Weigang Hou

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    |February 14, 2023
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    Summary
    This summary is machine-generated.

    This study introduces an all-optical temporal differentiator using a microring resonator and phase-change material for low-power, high-speed optical control. This novel design avoids traditional tuning methods, reducing chip size and energy consumption.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Traditional temporal differentiators often rely on electro-optic (EO) or thermo-optic (TO) tuning, which can be energy-intensive and slow.
    • Microring resonators (MRRs) offer compact and efficient optical filtering capabilities.

    Purpose of the Study:

    • To propose and analyze a novel microring resonator (MRR)-based all-optical tuning temporal differentiator (DIFF).
    • To leverage nonvolatile phase-change materials for low-energy, high-speed optical control of MRRs.

    Main Methods:

    • Utilizing Ge2Sb2Te5 (GST) as a phase-change material to tune the coupling regimes of the MRR.
    • Simulating the intensity and phase response of the GST-assisted MRR.
    • Analyzing the normalized intensity response of the temporal DIFF for Gaussian optical pulses.

    Main Results:

    • Achieved a broad range for the differentiation order α (0.47-1.64) by altering GST crystallinity.
    • Demonstrated low energy consumption and high-speed optical control compared to EO and TO methods.
    • Investigated the influence of input pulse width and detuning on differentiation order and output deviation.

    Conclusions:

    • The proposed GST-assisted MRR temporal differentiator offers a promising solution for compact and energy-efficient optical signal processing.
    • This all-optical tuning approach overcomes limitations of traditional tuning designs, paving the way for advanced photonic integrated circuits.