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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Related Experiment Video

Updated: Feb 20, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Secure multiple access for indoor optical wireless communications with time-slot coding and chaotic phase.

Tian Liang, Ke Wang, Christina Lim

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    This study introduces a new method for secure indoor optical wireless communication using time-slot coding and chaotic phase sequences. This approach ensures secure connections for multiple users without compromising signal quality for legitimate users.

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    Area of Science:

    • Optical Wireless Communication
    • Information Security
    • Signal Processing

    Background:

    • Indoor optical wireless communication systems offer high bandwidth but face security challenges.
    • Simultaneous secure access for multiple users remains a key research area.

    Purpose of the Study:

    • To develop a novel mechanism for simultaneously providing secure connections to multiple users in indoor optical wireless communication systems.
    • To enhance transmission security using a chaotic phase sequence generated by the logistic map.

    Main Methods:

    • Implementation of a time-slot coding scheme combined with a chaotic phase sequence.
    • Generation of chaotic phase sequences using the logistic map applied to each symbol.
    • Proof-of-concept experiments using 4-QAM and 16-QAM modulation formats at various data rates (1.25 Gb/s to 4 Gb/s).

    Main Results:

    • The proposed chaotic phase sequence did not degrade the signal quality for legitimate users.
    • Experimental validation across multiple system capacities and modulation formats (4-QAM, 16-QAM).
    • Demonstrated inability of unauthorized users to detect the signal without the decryption key.

    Conclusions:

    • The novel mechanism effectively provides simultaneous secure connections for multiple users in optical wireless systems.
    • The integration of time-slot coding and chaotic phase sequences offers a robust solution for secure optical wireless communication.
    • The method ensures data confidentiality without impacting the performance of legitimate users.