Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74458
Title: Enhanced Coherent BOTDA System without Trace Averaging
Authors: Guo, N 
Wang, L
Wu, H
Jin, C 
Tam, H 
Lu, C 
Keywords: Amplitude modulation
Brillouin optical time domain analyzer
Brillouin scattering
Distributed sensing
Fiber optics sensors
Optical fiber sensors
Probes
Receivers
Scattering
Signal to noise ratio
Issue Date: 2018
Publisher: Institute of Electrical and Electronics Engineers
Source: Journal of lightwave technology, 2018, v. 36, no. 4, p. 871-878 How to cite?
Journal: Journal of lightwave technology 
Abstract: We propose and experimentally demonstrate a scheme of coherent BOTDA system without any trace averaging. Assisted by a commercial integrated coherent receiver with a local oscillator (LO) generated through single sideband (SSB) modulation from the same laser source, the Brillouin signals carried on a stable intermediate frequency (IF) are extracted by electrical /digital filters and then recovered to baseband by digital signal processing (DSP), which increases the signal-to-noise ratio (SNR) to avoid the need of trace averaging and enable real-time signal acquisition. To eliminate the Brillouin gain fluctuation, two adjacent Brillouin time-domain traces stimulated by two sequential orthogonal pump pulses are recovered after the IF signals are detected in a real-time manner. Based on this configuration, a spatial resolution of 4 m and BFS uncertainty of 1.473 MHz are realized in distributed temperature sensing over 40.63 km range. With the non-local means (NLM) algorithm and distributed Raman amplification integrated into the system, the BFS uncertainty is enhanced to 0.843 MHz and better spatial resolution of 2 m over the same sensing fiber is achieved.o
URI: http://hdl.handle.net/10397/74458
ISSN: 0733-8724
EISSN: 1558-2213
DOI: 10.1109/JLT.2017.2742598
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