7 November 2012 The use of Walsh functions in modulating pump light of high-spatial-resolution BOTDA with NRZ pulses
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84219J (2012); doi: 10.1117/12.968584
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
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.
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Mohd Saiful Dzulkefly Bin Zan, Tatsuya Tsumuraya, Tsuneo Horiguchi, "The use of Walsh functions in modulating pump light of high-spatial-resolution BOTDA with NRZ pulses", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219J (7 November 2012); doi: 10.1117/12.968584; https://doi.org/10.1117/12.968584
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KEYWORDS
Spatial resolution

Signal to noise ratio

Phonons

Acoustics

Modulation

Signal processing

Sensors

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