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Enhancing spatial resolution in BOTDA using SSVPM method with trailing edge demodulation
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DOI：10.1016/j.optlaseng.2026.109760.png)
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Abstract
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Improving the spatial resolution (SR) of Brillouin Optical Time-Domain Analysis (BOTDA) systems is crucial for detecting small-scale events, yet existing methods often suffer from high complexity or limited effectiveness. To address this, the paper proposes a Sliding Symbolized Variance Parity Masking (SSVPM) method, which innovatively extracts the trailing-edge characteristics of the scattering signal to achieve centimeter-level SR. Theoretical analysis demonstrates that the width of the signal edge corresponds to the spatial length of the event, while the slope of the edge exhibits a linear correlation with event intensity-a relationship verified through both simulations and experiments. In a temperature experiment, the SSVPM method successfully demodulated a localized temperature rise event with a length of 10 cm over a 22 km sensing fiber, improving the SR from 5 m to 10 cm, representing a 50-fold enhancement. This method offers the advantages of clear theoretical underpinnings, simple implementation, and strong noise resistance, making it well-suited for practical engineering applications.
Keywords:
BOTDA
Spatial resolution
Trailing edge
SSVPM
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