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Key embedding transmission scheme based on multi-layer index modulation.

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    This study introduces a secure key embedding transmission scheme using multi-layer index modulation (ML-IM) and chaotic encryption. The novel method enhances security and transmission performance in optical systems.

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    Area of Science:

    • Optical Communications
    • Physical Layer Security
    • Information Theory

    Background:

    • Physical layer security is crucial for modern communication systems.
    • Existing key embedding schemes face challenges in security and performance.
    • Index modulation offers potential for enhanced security and data transmission.

    Purpose of the Study:

    • To propose and experimentally validate a novel key embedding transmission scheme using multi-layer index modulation (ML-IM).
    • To enhance physical layer security through multi-layer encryption using a chaotic system.
    • To improve transmission performance and reduce resource overhead in optical access systems.

    Main Methods:

    • Implementation of ML-IM in an 8x16 subcarrier matrix.
    • Key masking using silent row positions.
    • Subcarrier index modulation (SIM) in silent rows for additional data modulation.
    • Multi-layer encryption utilizing a four-dimensional chaotic system.
    • Experimental demonstration with a 16 Gb/s 16-QAM signal over 25 km single-mode fiber.

    Main Results:

    • The proposed scheme achieves high security with initial value sensitivity and a key space of 10^120.
    • Transmission performance is maintained during encryption, with a bit error rate (BER) of approximately 0.5 even when the indexing rule is compromised.
    • A sensitivity gain of 0.51 dB at FEC = 3.8x10^-3 was achieved compared to existing SIM-16QAM schemes.
    • The scheme effectively compensates for key data transmission overhead.

    Conclusions:

    • The developed ML-IM based key embedding scheme offers a high-security, high-flexibility, and low-loss solution for optical communication.
    • It significantly enhances physical layer security and demonstrates robustness against unauthorized access.
    • The scheme provides improved signal performance and reduced resource overhead, making it valuable for future optical access networks.