Analysis of pulse modulation format in coded BOTDA sensors

Optics Express
Marcelo A SotoF Di Pasquale

Abstract

A theoretical and experimental analysis of the impact of pulse modulation format on Brillouin optical time-domain analysis (BOTDA) sensors using pulse coding techniques has been carried out. Pulse coding with conventional non-return-to-zero (NRZ) modulation format is shown to induce significant distortions in the measured Brillouin gain spectrum (BGS), especially in proximity of abrupt changes in the fiber gain spectra. Such an effect, as confirmed by the theoretical analysis, is due to acoustic wave pre-excitation and non-uniform gain which depends on the bit patterns defined by the different codewords. A successful use of pulse coding techniques then requires to suitably optimize the employed modulation format in order to avoid spurious oscillations causing severe penalties in the attained accuracy. Coding technique with return-to-zero (RZ) modulation format is analyzed under different duty-cycle conditions for a 25 km-long sensing scheme, showing that low duty-cycle values are able to effectively suppress the induced distortions in the BGS and allow for spatially-accurate, high-resolution strain and temperature measurements being able to fully exploit the provided coding gain (approximately 7.2 dB along 25 km distance) with ...Continue Reading

References

Jan 19, 2010·Optics Letters·Marcelo A SotoLuc Thévenaz

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Citations

Feb 12, 2014·Optics Express·Marcelo A Soto, Luc Thévenaz
Apr 26, 2017·Optics Express·Haritz IribasSébastien Le Floch
Oct 16, 2015·Optics Letters·Yonas MuanendaFabrizio Di Pasquale
Oct 20, 2017·Applied Optics·Xianyang QianHan Wu
Mar 17, 2019·Optics Express·Regina MagalhãesMiguel Gonzalez-Herraez
Mar 4, 2020·Optics Express·Yin ZhouBin Luo
Aug 14, 2013·Optics Express·Marcelo A SotoLuc Thévenaz
Aug 2, 2013·Optics Letters·M TakiF Di Pasquale
Aug 19, 2018·Optics Express·Zhisheng YangMarcelo A Soto
Jan 26, 2011·Optics Letters·Marcelo A SotoFabrizio Di Pasquale
Nov 15, 2020·Nature Communications·Xizi SunLuc Thévenaz

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