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    Area of Science:

    • Optical Communications
    • Information Security
    • Signal Processing

    Background:

    • Secure data transmission is critical in modern communication systems.
    • Existing encryption methods can be vulnerable to sophisticated attacks.
    • Physical-layer security offers inherent protection by leveraging unique channel characteristics.

    Purpose of the Study:

    • To propose a novel seven-core fiber key synchronization transmission scheme.
    • To enhance system security by embedding encryption directly into the modulation process.
    • To achieve inherent physical-layer security against brute-force attacks.

    Main Methods:

    • Utilizing constellation flat coding (CFC) to map binary keys to silent subcarriers.
    • Employing a four-dimensional (4D) chaotic model for data encryption (XOR, CFC rules, masking).
    • Implementing 3D constellation mapping, flattening to 2D, and dimension masking for chaotic encryption.

    Main Results:

    • Experimental validation on a 56 Gb/s 3D index modulation (IM) CFC signal over a 2 km seven-core fiber.
    • Minimal signal difference (<0.1 dB) observed across fiber cores.
    • Achieved a bit error rate (BER) of approximately 0.5 for 2D-CFC demodulation with key mismatch.

    Conclusions:

    • The proposed scheme effectively couples index selection, constellation mapping, and chaotic modulation for inherent security.
    • The vast chaotic seed parameter space (~10^109) renders brute-force attacks infeasible.
    • This approach provides a robust physical-layer security solution for optical communication systems.