Ultra-long distance fiber Bragg grating sensor system based on self-heterodyne detection

Jiangjiang Cai; Guoliang Xu; Xiaodong Zhao

doi:10.1117/12.970252

17 October 2012 Ultra-long distance fiber Bragg grating sensor system based on self-heterodyne detection

Jiangjiang Cai, Guoliang Xu, Xiaodong Zhao

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842143 (2012) https://doi.org/10.1117/12.970252
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A long-distance fiber Bragg grating (FBG) sensor system based on the self-heterodyne detection technique is proposed and experimentally demonstrated. In this system, a wavelength tunable laser was employed to scan the reflection spectrum of the FBG, and the reflection sensing signal was separated from the Rayleigh backscattering effectively. The system can achieve 148 km measurement length without amplification and the signal-noise ratio (SNR) of the detected Bragg wavelength signal is up to 24 dB. Applying this system to remote temperature detection, the measurement accuracy is 1°C.

Citation Download Citation

Jiangjiang Cai, Guoliang Xu, and Xiaodong Zhao "Ultra-long distance fiber Bragg grating sensor system based on self-heterodyne detection", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842143 (17 October 2012); https://doi.org/10.1117/12.970252

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