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    A novel hybrid aperiodic-coded Brillouin optical correlation domain analysis (HA-coded BOCDA) fiber sensor enables long-range, high-resolution distributed sensing. This breakthrough suppresses detrimental effects, achieving a 72.65-km range with 5-cm resolution.

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    Area of Science:

    • Optoelectronics and Photonics
    • Fiber Optic Sensing Technology
    • Distributed Measurement Systems

    Background:

    • Brillouin optical correlation domain analysis (BOCDA) is a key technology for distributed fiber sensing.
    • Existing BOCDA systems face limitations in sensing range and spatial resolution due to detrimental effects like stimulated Brillouin scattering (SBS).
    • Pulse coding methods in BOCDA can introduce parasitic effects that hinder performance.

    Purpose of the Study:

    • To propose and validate a hybrid aperiodic-coded BOCDA (HA-coded BOCDA) fiber sensor.
    • To achieve long-range and high-spatial-resolution distributed measurements.
    • To suppress detrimental effects in the pulse coding-induced SBS process for enhanced BOCDA performance.

    Main Methods:

    • Development of a hybrid aperiodic coding scheme for BOCDA.
    • Exploitation of a special energy transformation mode generated by high-speed phase modulation.
    • Suppression of parasitic effects in the pulse coding-induced cascaded SBS process.

    Main Results:

    • Demonstration of a 72.65-km sensing range.
    • Achievement of a 5-cm spatial resolution.
    • Attainment of temperature and strain measurement accuracies of 2℃ and 40 με, respectively.
    • Realization of low system complexity and enhanced measurement speed.

    Conclusions:

    • The proposed HA-coded BOCDA sensor effectively overcomes limitations of conventional BOCDA systems.
    • The novel approach enables unprecedented long-range and high-spatial-resolution distributed sensing.
    • This technology offers a promising solution for various applications requiring precise fiber optic sensing.