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Title: Coherent BOTDA using phase- and polarization-diversity heterodyne detection and embedded digital signal processing
Authors: Wang, L
Guo, N 
Jin, C 
Zhong, KP 
Zhou, X 
Yuan, JH 
Kang, Z 
Zhou, B 
Yu, CY 
Tam, HY 
Lu, C 
Issue Date: 15-Jun-2017
Source: IEEE sensors journal, 15 June 2017, v. 17, no. 12, p. 3728-3734
Abstract: We have proposed and experimentally demonstrated a configuration of coherent BOTDA using optical phase- and polarization-diversity heterodyne detection and embedded digital signal processing (DSP). With the unwanted probe side-band and Rayleigh scattered noise eliminated by stable electrical filtering, the in-phase and quadrature-phase heterodyne sensing signals in both x- and y-polarizations are received by the phase- and polarization-diversity coherent receiver with independent local light, and processed by the subsequent embedded DSP. The embedded DSP algorithms are designed to recover the baseband BOTDA trace for sensing and remove the intermediate frequency noise (both amplitude and phase noise) to avoid trace distortion. A spatial resolution of similar to 3 m and temperature accuracy of +/- 0.3 degrees C have been achieved over 40-km sensing distance. The configuration, compatible with the detection scheme of optical coherent communication systems, is potential for future highspeed coherent BOTDA with real-time DSP designed to satisfy different requirements.
Keywords: Brillouin optical time-domain analysis (BOTDA)
Phase- and polarization-diversity heterodyne detection
Digital signal processing
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE sensors journal 
ISSN: 1530-437X
EISSN: 1558-1748
DOI: 10.1109/JSEN.2017.2696043
Rights: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication L. Wang et al., "Coherent BOTDA Using Phase- and Polarization-Diversity Heterodyne Detection and Embedded Digital Signal Processing," in IEEE Sensors Journal, vol. 17, no. 12, pp. 3728-3734, 15 June15, 2017 is available at https://doi.org/10.1109/JSEN.2017.2696043.
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