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BOTDA using channel estimation with direct-detection optical OFDM technique.

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    A new Brillouin optical time-domain analysis (BOTDA) system uses an optical orthogonal frequency division multiplexing (OOFDM) probe signal, eliminating frequency sweeps. This novel approach achieves high spatial resolution in fiber optic sensing with reduced measurement times.

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    Area of Science:

    • Photonics and Optical Engineering
    • Fiber Optic Sensing Technology
    • Signal Processing in Communications

    Background:

    • Brillouin optical time-domain analysis (BOTDA) is a critical technology for distributed fiber sensing.
    • Traditional BOTDA systems often require complex frequency sweep operations, increasing measurement time and system complexity.
    • Optical orthogonal frequency division multiplexing (OOFDM) offers advantages in spectral efficiency and flexibility for optical signal generation.

    Purpose of the Study:

    • To propose and demonstrate a novel BOTDA system that eliminates the need for frequency sweep operations.
    • To analyze the impact of the peak-to-average power ratio (PAPR) of the OOFDM probe signal on Brillouin gain spectrum (BGS) recovery.
    • To achieve high-resolution and rapid distributed fiber sensing using an intensity-modulated direct-detection OOFDM (IM-DD-OOFDM) probe signal.

    Main Methods:

    • Development of a BOTDA system utilizing an IM-DD-OOFDM probe signal.
    • Theoretical and experimental analysis of the influence of OFDM probe signal PAPR on BGS.
    • Reconstruction of the complex BGS using a channel estimation algorithm.
    • Localization of Brillouin frequency shift (BFS) through intensity spectrum curve fitting.

    Main Results:

    • Successful demonstration of the IM-DD-OOFDM BOTDA system.
    • Achieved a spatial resolution of 25 meters over a 10 km standard single-mode fiber link.
    • Significantly reduced measurement time compared to conventional BOTDA systems.
    • Validated the theoretical analysis of PAPR's impact on BGS recovery.

    Conclusions:

    • The proposed IM-DD-OOFDM BOTDA system offers a viable alternative to frequency-swept BOTDA, simplifying system design.
    • This novel approach enables efficient and rapid distributed fiber sensing with high spatial resolution.
    • The findings provide valuable insights into optimizing OOFDM probe signals for BOTDA applications.