TY - JOUR
T1 - Quadrature Operating Point Stabilizing Technique for Fiber-Optic Fabry-Perot Sensors Using Vernier-Tuned Distributed Bragg Reflectors Laser
AU - Li, Ang
AU - Jing, Zhenguo
AU - Liu, Yueying
AU - Liu, Qiang
AU - Huang, Zhiyuan
AU - Cheung, Yang
AU - Zhang, Yang
AU - Han, Ming
AU - Peng, Wei
N1 - Funding Information:
Manuscript received July 3, 2020; revised August 11, 2020; accepted August 12, 2020. Date of publication August 17, 2020; date of current version December 16, 2020. This work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 61727816 and Grant 61520106013 and in part by the Fundamental Research Funds for Central Universities under Grant DUT18ZD215. The associate editor coordinating the review of this article and approving it for publication was Prof. Kazuaki Sawada. (Corresponding author: Zhenguo Jing.) Ang Li, Yueying Liu, Zhiyuan Huang, and Yang Cheung are with the School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China (e-mail: leeang58@mail.dlut.edu.cn; yueyingliu@mail.dlut.edu.cn; siaic@mail.dlut.edu.cn; zhangyang1995@mail.dlut.edu.cn).
Publisher Copyright:
© 2001-2012 IEEE.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - Drift of Quadrature operating point (Q-point) due to variations in ambient temperature restricts the demodulation accuracy of fiber-optic extrinsic Fabry-Perot interferometer (EFPI) sensors. To overcome this challenge, in this paper, we propose and demonstrate a self-stabilizing Q-point system based on Vernier-tuned distributed Bragg reflectors (VT-DBR) laser, the laser wavelength is locked to a point with the maximum slope on the interference spectrum of fiber-optic EFPI sensor. Taking advantage of large-tuning range (40nm) and fast wavelength switching capability (<20ns), we develop a robust EFPI acoustic sensor system with stable Q-point operation. When the EFPI sensor is subject to ambient temperature variations, we use an FPGA to implement the fast laser wavelength switching of the laser and automatic Q-point locking that ensure Q-point stability. The operating point drift from Q-point is obtained by dc voltage output changes. Experimental results indicate that stabilizing Q-point of the EFPI sensor is effectively realized during the temperature changes between 27-32°C. Without the stabilization method, the deviation is up to 85.5% of dc voltage output at operating point from Q-point value. With the stabilization method, the deviation is less than 0.68%. This self-stabilizing Q-point method based on VT-DBR laser has a strong ability to resist ambient temperature variations, and provides a novel solution to Q-point drift of fiber-optic EFPI sensors.
AB - Drift of Quadrature operating point (Q-point) due to variations in ambient temperature restricts the demodulation accuracy of fiber-optic extrinsic Fabry-Perot interferometer (EFPI) sensors. To overcome this challenge, in this paper, we propose and demonstrate a self-stabilizing Q-point system based on Vernier-tuned distributed Bragg reflectors (VT-DBR) laser, the laser wavelength is locked to a point with the maximum slope on the interference spectrum of fiber-optic EFPI sensor. Taking advantage of large-tuning range (40nm) and fast wavelength switching capability (<20ns), we develop a robust EFPI acoustic sensor system with stable Q-point operation. When the EFPI sensor is subject to ambient temperature variations, we use an FPGA to implement the fast laser wavelength switching of the laser and automatic Q-point locking that ensure Q-point stability. The operating point drift from Q-point is obtained by dc voltage output changes. Experimental results indicate that stabilizing Q-point of the EFPI sensor is effectively realized during the temperature changes between 27-32°C. Without the stabilization method, the deviation is up to 85.5% of dc voltage output at operating point from Q-point value. With the stabilization method, the deviation is less than 0.68%. This self-stabilizing Q-point method based on VT-DBR laser has a strong ability to resist ambient temperature variations, and provides a novel solution to Q-point drift of fiber-optic EFPI sensors.
KW - Fabry-Perot interferometer
KW - Q-point
KW - VT-DBR laser
KW - acoustic sensing system
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U2 - 10.1109/JSEN.2020.3017083
DO - 10.1109/JSEN.2020.3017083
M3 - Article
AN - SCOPUS:85098143193
SN - 1530-437X
VL - 21
SP - 2084
EP - 2091
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
IS - 2
M1 - 9169674
ER -