TY - JOUR
T1 - Linearly Configured Brillouin Optical Correlation Domain Analysis System Incorporating Time-Domain Data Processing
AU - Ryu, Gukbeen
AU - Kim, Gyu Tae
AU - Song, Kwang Yong
AU - Lee, Sang Bae
AU - Lee, Kwanil
N1 - Funding Information:
Manuscript received January 14, 2019; revised April 12, 2019; accepted May 20, 2019. Date of publication May 29, 2019; date of current version September 18, 2019. This work was supported by the R&D Program (2E29300) funded by the Korea Institute of Science and Technology. (Corresponding author: Kwanil Lee.) G. Ryu is with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea, and also with the Nanophotonics Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea (e-mail: 215505@kist.re.kr).
Publisher Copyright:
© 1983-2012 IEEE.
PY - 2019/9/15
Y1 - 2019/9/15
N2 - We propose a linearly configured Brillouin optical correlation domain analysis system incorporated with time domain data processing, where a fiber under test (FUT) is accessed from single end and multiple sensing points are simultaneously interrogated to extend the measurement range. In our scheme, correlation peaks (CPs) are sequentially generated by the interaction between a pump pulse outgoing from the system and a probe wave reflected from the end of an FUT, where the time-domain data processing is applied to obtain the Brillouin gain spectrum of each CP. In experiments, we demonstrate simultaneous acquisition of Brillouin gain spectra at 982 CPs with a spatial resolution of less than 5 cm and a sensing range extended from 10.3 m to 10.15 km. We also show that the amplitude of frequency modulation (Δf), which has been limited to the Brillouin frequency of an FUT in linear-configured BOCDA systems, can be enlarged without definite limitation by the time-domain data processing. In the experimental confirmation Δf of 15.6 GHz, about 1.5 times of the Brillouin frequency of FUT, is successfully applied to simultaneous analysis of 98 CPs by the time-domain data processing.
AB - We propose a linearly configured Brillouin optical correlation domain analysis system incorporated with time domain data processing, where a fiber under test (FUT) is accessed from single end and multiple sensing points are simultaneously interrogated to extend the measurement range. In our scheme, correlation peaks (CPs) are sequentially generated by the interaction between a pump pulse outgoing from the system and a probe wave reflected from the end of an FUT, where the time-domain data processing is applied to obtain the Brillouin gain spectrum of each CP. In experiments, we demonstrate simultaneous acquisition of Brillouin gain spectra at 982 CPs with a spatial resolution of less than 5 cm and a sensing range extended from 10.3 m to 10.15 km. We also show that the amplitude of frequency modulation (Δf), which has been limited to the Brillouin frequency of an FUT in linear-configured BOCDA systems, can be enlarged without definite limitation by the time-domain data processing. In the experimental confirmation Δf of 15.6 GHz, about 1.5 times of the Brillouin frequency of FUT, is successfully applied to simultaneous analysis of 98 CPs by the time-domain data processing.
KW - Optical fiber sensors
KW - stimulated Brillouin scattering
KW - time domain analysis
UR - http://www.scopus.com/inward/record.url?scp=85072556614&partnerID=8YFLogxK
U2 - 10.1109/JLT.2019.2919448
DO - 10.1109/JLT.2019.2919448
M3 - Article
AN - SCOPUS:85072556614
VL - 37
SP - 4728
EP - 4733
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
SN - 0733-8724
IS - 18
M1 - 8725565
ER -