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Proceedings Paper

The use of Walsh functions in modulating pump light of high-spatial-resolution BOTDA with NRZ pulses
Author(s): Mohd Saiful Dzulkefly Bin Zan; Tatsuya Tsumuraya; Tsuneo Horiguchi
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Paper Abstract

We have previously introduced phase modulation into pulsed pump of Brillouin Optical Time Domain Analysis (BOTDA) in order to obtain high spatial resolution. In this study, we propose to use Walsh functions in coding nonreturn- to-zero (NRZ) formatted pump pulses of the high-spatial-resolution BOTDA to increase signal-to-noise ratio (SNR). Contrary to previous reports, it is numerically and experimentally verified that the use of the Walsh functions in the high-spatial-resolution BOTDA allows the increase in SNR without deteriorating its spatial resolution expected. We demonstrate measurements with 1.5 dB improvement in SNR and with approximately 0.2 m spatial resolution.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219J (7 November 2012); doi: 10.1117/12.968584
Show Author Affiliations
Mohd Saiful Dzulkefly Bin Zan, Shibaura Institute of Technology (Japan)
Tatsuya Tsumuraya, Shibaura Institute of Technology (Japan)
Tsuneo Horiguchi, Shibaura Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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