TY - JOUR
T1 - Gain Spectrum Engineering in Slope-Assisted Dynamic Brillouin Optical Time-Domain Analysis
AU - Feng, Cheng
AU - Bhatta, Hari Datta
AU - Bohbot, Jonathan
AU - Davidi, Roy
AU - Lu, Xin
AU - Schneider, Thomas
AU - Tur, Moshe
N1 - Publisher Copyright:
© 1983-2012 IEEE.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - Slope-assisted Brillouin optical time domain analysis (SA-BOTDA) is a fast and distributed sensing technique that interrogates the Brillouin gain spectrum (BGS) near the middle of the linear region of its slope, allowing the measurement of high frequency vibrations. However, environmentally-induced deviations of the interrogation point from the rather small linear region around the optimum frequency position, result in harmonic distortion and changes in the slope value, which determines the gain-to-frequency conversion factor. Engineering the BGS by adding a loss probe, we propose a novel and improved version of SA-BOTDA, having a significantly wider drift tolerance for the interrogation point. Here, using a 14 ns pump pulse and a judicious choice of the frequency of the loss probe, we demonstrate an engineered BGS having a 70% wider frequency range (as compared with the conventional BGS), where the interrogation point can drift without compromising either the prescribed level of harmonic distortion or the given slope tolerance, further benefiting the flexibility and usage of SA-BOTDA.
AB - Slope-assisted Brillouin optical time domain analysis (SA-BOTDA) is a fast and distributed sensing technique that interrogates the Brillouin gain spectrum (BGS) near the middle of the linear region of its slope, allowing the measurement of high frequency vibrations. However, environmentally-induced deviations of the interrogation point from the rather small linear region around the optimum frequency position, result in harmonic distortion and changes in the slope value, which determines the gain-to-frequency conversion factor. Engineering the BGS by adding a loss probe, we propose a novel and improved version of SA-BOTDA, having a significantly wider drift tolerance for the interrogation point. Here, using a 14 ns pump pulse and a judicious choice of the frequency of the loss probe, we demonstrate an engineered BGS having a 70% wider frequency range (as compared with the conventional BGS), where the interrogation point can drift without compromising either the prescribed level of harmonic distortion or the given slope tolerance, further benefiting the flexibility and usage of SA-BOTDA.
KW - Brillouin gain spectrum engineering
KW - Brillouin optical time-domain analyzer
KW - Stimulated Brillouin scattering
KW - dynamic sensing
KW - slope-assisted Brillouin sensing
UR - http://www.scopus.com/inward/record.url?scp=85097426444&partnerID=8YFLogxK
U2 - 10.1109/JLT.2020.3021796
DO - 10.1109/JLT.2020.3021796
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AN - SCOPUS:85097426444
SN - 0733-8724
VL - 38
SP - 6967
EP - 6975
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 24
M1 - 9186772
ER -