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Sensors 2017, 17(7), 1472; doi:10.3390/s17071472

Performance Optimization Design for a High-Speed Weak FBG Interrogation System Based on DFB Laser

1
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
2
Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China
3
Department of Optical Access Network, Huawei Technologies USA, Santa Clara, CA 95050, USA
*
Author to whom correspondence should be addressed.
Academic Editors: George Rodriguez, Joseba Zubia and Paulo S. André
Received: 25 April 2017 / Revised: 9 June 2017 / Accepted: 19 June 2017 / Published: 22 June 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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Abstract

A performance optimization design for a high-speed fiber Bragg grating (FBG) interrogation system based on a high-speed distributed feedback (DFB) swept laser is proposed. A time-division-multiplexing sensor network with identical weak FBGs is constituted to realize high-capacity sensing. In order to further improve the multiplexing capacity, a waveform repairing algorithm is designed to extend the dynamic demodulation range of FBG sensors. It is based on the fact that the spectrum of an FBG keeps stable over a long period of time. Compared with the pre-collected spectra, the distorted spectra waveform are identified and repaired. Experimental results show that all the identical weak FBGs are distinguished and demodulated at the speed of 100 kHz with a linearity of above 0.99, and the range of dynamic demodulation is extended by 40%. View Full-Text
Keywords: optical fiber sensing; weak fiber Bragg grating; high speed; distributed feedback laser optical fiber sensing; weak fiber Bragg grating; high speed; distributed feedback laser
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Yao, Y.; Li, Z.; Wang, Y.; Liu, S.; Dai, Y.; Gong, J.; Wang, L. Performance Optimization Design for a High-Speed Weak FBG Interrogation System Based on DFB Laser. Sensors 2017, 17, 1472.

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