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Secure OFDM-PON using three-dimensional selective probabilistic shaping and chaos.

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    A new encryption scheme enhances security and performance in optical networks. This method improves signal transmission and offers robust protection against attacks.

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    Area of Science:

    • Optical Communications
    • Physical Layer Security
    • Information Theory

    Background:

    • Orthogonal frequency division multiplexing-based passive optical networks (OFDM-PONs) require enhanced physical layer security.
    • Improving transmission performance alongside security is a key challenge in optical networks.

    Purpose of the Study:

    • To propose a novel three-dimensional selective probabilistic shaping (3D-SPS) and chaos-based multi-stage encryption scheme.
    • To enhance physical layer security and transmission performance in OFDM-PONs.

    Main Methods:

    • Applied 3D-SPS on a cubic constellation within symbol sub-sequences to increase probability distribution.
    • Generated and encrypted compressed shaping information (CSI) as a synchronization head.
    • Implemented 3D scrambling while preserving the shaping effect.

    Main Results:

    • Successfully transmitted encrypted signals at 35.3 Gb/s over 25-km SSMF and back-to-back.
    • Achieved approximately 2.4 dB modulation gain and 0.9 dB shaping gain at a BER of 10⁻³.
    • Demonstrated a key space of 10¹²⁰ for the encryption, ensuring resistance to exhaustive attacks.

    Conclusions:

    • The proposed 3D-SPS and encryption scheme effectively enhances both security and transmission performance in OFDM-PONs.
    • The scheme offers significant gains in received optical power and maintains low computational complexity.