TY - JOUR
T1 - A dual golay complementary pair of sequences for improving the performance of phase-shift pulse BOTDA fiber sensor
AU - Zan, Mohd Saiful Dzulkefly Bin
AU - Horiguchi, Tsuneo
N1 - Funding Information:
Manuscript received February 27, 2012; revised May 27, 2012, July 24, 2012; accepted August 10, 2012. Date of publication August 27, 2012; date of current version October 17, 2012. This work was supported in part by KAKENHI(22560427) of Japan Society for the Promotion of Science (JSPS). The work of M. S. D. Zan was supported in part by the Ministry of Higher Education of Malaysia (MOHE), MARA Education Foundation (YPM), and the Universiti Kebangsaan Malaysia (UKM).
PY - 2012
Y1 - 2012
N2 - We propose in this paper to configure a dual Golay complementary pair of sequences (DGCP) by nesting one Golay complementary pair of sequences (GCP) into the other GCP. We show that the DGCP also has the unique property that the side lobes of the correlation functions are cancelled exactly as the conventional GCP. The DGCP allows the simultaneous use of coded RZ-pulses and coded NRZ-pulses in the pump light of the Brillouin optical time-domain analysis (BOTDA). We call them in this paper coded discrete pulses and coded continuous pulses, respectively. The simultaneous use of both types of coded pulses for the BOTDA makes it possible to employ virtually longer code than the use of only one kind of coded pulses. We theoretically show the dependence of signal-to-noise ratio enhancement (SNRE) on the code length of the DGCP as well as on the code lengths of the GCPs used for the discrete and continuous pulses. Examination of the spatial resolution is also given. Experimental results illustrate the theoretical considerations; about 7 dB of SNRE and 10-cm of spatial resolution are achieved by using DGCP, being in accordance with the theory.
AB - We propose in this paper to configure a dual Golay complementary pair of sequences (DGCP) by nesting one Golay complementary pair of sequences (GCP) into the other GCP. We show that the DGCP also has the unique property that the side lobes of the correlation functions are cancelled exactly as the conventional GCP. The DGCP allows the simultaneous use of coded RZ-pulses and coded NRZ-pulses in the pump light of the Brillouin optical time-domain analysis (BOTDA). We call them in this paper coded discrete pulses and coded continuous pulses, respectively. The simultaneous use of both types of coded pulses for the BOTDA makes it possible to employ virtually longer code than the use of only one kind of coded pulses. We theoretically show the dependence of signal-to-noise ratio enhancement (SNRE) on the code length of the DGCP as well as on the code lengths of the GCPs used for the discrete and continuous pulses. Examination of the spatial resolution is also given. Experimental results illustrate the theoretical considerations; about 7 dB of SNRE and 10-cm of spatial resolution are achieved by using DGCP, being in accordance with the theory.
KW - Complementary code
KW - coded Brillouin optical time-domain analysis (BOTDA)
KW - fiber optic sensor
KW - stimulated Brillouin scattering (SBS)
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U2 - 10.1109/JLT.2012.2215578
DO - 10.1109/JLT.2012.2215578
M3 - Article
AN - SCOPUS:84867786244
SN - 0733-8724
VL - 30
SP - 3338
EP - 3356
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 21
M1 - 6287534
ER -