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Self-propagated chaotic dynamically enhanced optical physical layer encryption communication system based on

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    This study introduces a novel optical physical layer encryption scheme using a bidirectional long short-term memory neural network (Bi-LSTM-NN) to enhance chaotic dynamics. The method improves data security and achieves high-speed encrypted transmission in optical networks.

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    Area of Science:

    • Optical communication security
    • Chaos theory applications
    • Neural network-based encryption

    Background:

    • Physical layer chaotic encryption offers secure communication compatible with existing networks.
    • Digital implementation of chaotic systems often suffers from degraded dynamics due to precision limitations.
    • This degradation hinders the widespread application of digital chaotic systems.

    Purpose of the Study:

    • To propose a novel self-propagated nonlinear chaotic dynamical enhanced optical physical layer encryption scheme.
    • To leverage bidirectional long short-term memory neural networks (Bi-LSTM-NN) for dynamical enhancement of chaotic sequences.
    • To improve the security and performance of optical communication systems.

    Main Methods:

    • Utilizing a bidirectional long short-term memory neural network (Bi-LSTM-NN) for iterative training and learning of chaotic sequences.
    • Employing Bi-LSTM-NN to generate chaotic sequences with self-propagated dynamical enhancement.
    • Implementing the scheme for encrypting constellation points and frequency-domain information.

    Main Results:

    • Achieved correlation coefficients (CC) over 0.98 for enhanced chaotic sequences.
    • Increased the range of sample entropy above 0.8 by more than 2 times compared to the original chaotic system.
    • Enhanced initial value sensitivity (x0 up to 2.28x, y0 up to 1.3x), expanding the key space to 10^520.
    • Successfully demonstrated encrypted 16 quadrature amplitude modulation-orthogonal frequency division multiplexing (16QAM-OFDM) signal transmission at 65.9 Gb/s over 2 km of 7-core optical fiber.

    Conclusions:

    • The proposed Bi-LSTM-NN based scheme effectively enhances chaotic dynamics for optical physical layer encryption.
    • The enhanced scheme significantly improves data security and key space.
    • The successful high-speed encrypted transmission validates the scheme's potential for future optical networks.