OFDR Demodulation System Based on Adaptive Gaussian Fitting for Ultra-Weak Fiber Bragg Gratings

Abstract

To address the challenges of complex demodulation algorithms and limited real-time performance in Ultra-Weak Fiber Bragg Grating OFDR systems, this study developed an OFDR demodulation system based on adaptive Gaussian fitting. The system incorporates a Power Spectral Density threshold for accurate identification and localization and a 3σ criterion to dynamically trim grating intervals. The approach significantly reduces computational resource demands and enhances demodulation speed. The system achieved 1.95 million gratings/second with wavelength accuracy better than 5pm, while reducing on-chip logic units by 51.2% and block memory by 73.2%.

Authors

Z.-H. Luo, Z. Yang, et al. — China Three Gorges University & Shijiazhuang Tiedao University

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