Title :
Self-Heterodyne Detection for SNR Improvement and Distributed Phase-Shift Measurements in BOTDA
Author :
Zornoza, Ander ; Sagues, Mikel ; Loayssa, Alayn
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. Publica de Navarra, Pamplona, Spain
fDate :
4/15/2012 12:00:00 AM
Abstract :
In this paper we present a Brillouin optical time domain analysis (BOTDA) sensor that takes advantage of the enhanced characteristics obtained employing self-heterodyne optical detection combined with synchronous demodulation. By employing this technique we increase the sensitivity of the sensor and demonstrate experimentally a 10.75-dB enhancement in the SNR compared to conventional direct-detection systems. This detection scheme also enables distributed measurements of the Brillouin phase-shift in an optical fiber, which can lead to enhanced BOTDA schemes.
Keywords :
Brillouin spectra; demodulation; fibre optic sensors; heterodyne detection; optical phase shifters; BOTDA; Brillouin optical time domain analysis sensor; SNR improvement; direct detection systems; distributed phase shift measurements; self heterodyne detection; self heterodyne optical detection; synchronous demodulation; Optical fiber sensors; Optical fibers; Probes; Radio frequency; Scattering; Signal to noise ratio; Temperature measurement; Brillouin scattering; coherent systems; fiber optics sensors; optical sensing and sensors; self-heterodyne detection;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2011.2168808
