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Quasi-light Storage for Optical Data Packets
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Photonic downconversion based on optical carrier bidirectional reusing in a phase modulator.

Tianwei Jiang, Song Yu, Qian Xie

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    This study introduces a new photonic downconversion technique using optical carrier reusing. The method enhances system gain by 29 dB and reduces noise floor by 12.1 dB.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Signal Processing

    Background:

    • Traditional photonic downconversion methods face limitations in optical carrier utilization and photodetector saturation.
    • Enhancing system gain and reducing noise floor are critical for improving optical communication performance.

    Purpose of the Study:

    • To propose and experimentally validate a novel photonic downconversion method utilizing optical carrier reusing.
    • To improve system gain and simultaneously reduce intensity noise in photonic systems.

    Main Methods:

    • A phase modulator (PM) is positioned between two fiber Bragg gratings (FBGs) to reflect the optical carrier and transmit sidebands.
    • The optical carrier is modulated bidirectionally and isolated from the photodetector (PD).
    • A 2x2 optical coupler and balanced PD are employed with a specific phase difference design.

    Main Results:

    • Achieved a 29 dB gain improvement compared to traditional dual-series intensity modulators.
    • Demonstrated a 12.1 dB reduction in the noise floor.
    • Successfully avoided optical carrier injection into the PD, preventing power saturation and enhancing carrier utilization.

    Conclusions:

    • The proposed photonic downconversion method effectively enhances system gain and reduces noise.
    • Optical carrier reusing in this configuration offers a significant advantage over conventional techniques.
    • This technique holds promise for improving the performance of optical communication systems.