70 km long-range Raman distributed optical fibre sensing through enhanced anti-distortion coding and waveform reconstruction.

ABSTRACT: The practical implementation of Raman distributed optical fibre sensing has been fundamentally constrained by the inherent low signal-to-noise ratio (SNR), particularly for sensing distance exceeding 30 km. We propose a paradigm that combines enhanced anti-distortion coding processing, advanced Raman scattering waveform reconstruction preprocessing, and Haar wavelet denoising to transcend this physical limitation. The proposed pre-processing framework simultaneously optimises complementary sequences correlation, effectively mitigates disturbances of transient effects and improves sensing performance. The experimental demonstration achieves performance metrics: 70.0 km sensing distance with 1.58 m spatial resolution, while maintaining 0.91 °C measurement accuracy and 5.39 °C temperature res

SUBMITTER: Zhang F 

PROVIDER: S-EPMC12820281 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature