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Direct phase modulation via optical injection: theoretical study.

Roman Shakhovoy, Marius Puplauskis, Violetta Sharoglazova

    Optics Express
    |April 6, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study provides the first theoretical analysis of optical injection phase modulation for quantum key distribution transmitters. It investigates noise, gain non-linearity, and temperature drift, offering practical guidance for system development.

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    Area of Science:

    • Quantum Information Science
    • Optoelectronics
    • Laser Physics

    Background:

    • Direct phase modulation via optical injection is a novel technique for phase coding in gain-switched lasers.
    • This method is suitable for quantum key distribution (QKD) transmitters due to its compactness, low loss, and CMOS compatibility.
    • Existing research lacks comprehensive theoretical analysis of this modulation scheme.

    Purpose of the Study:

    • To conduct the first theoretical analysis of direct phase modulation via optical injection for QKD.
    • To investigate the impact of spontaneous emission noise on system performance.
    • To examine the influence of gain non-linearity and temperature drift effects.

    Main Methods:

    • Theoretical analysis of the optical injection phase modulation scheme.
    • Modeling the effects of spontaneous emission noise.
    • Investigating gain non-linearity and temperature drift in the laser system.

    Main Results:

    • Spontaneous emission noise significantly impacts the performance of optical injection phase modulation.
    • Gain non-linearity plays a crucial role in the phase modulation process.
    • Temperature drift effects were found to substantially influence system stability and performance.

    Conclusions:

    • Theoretical analysis reveals critical factors affecting optical injection phase modulation for QKD.
    • Understanding noise, gain non-linearity, and temperature drift is essential for optimizing transmitter design.
    • Practical guidelines are provided to account for these phenomena in developing and employing optical-injection-based phase modulators.