A novel demodulation technique for identical weak fiber Bragg grating array sensing with improved performance

Jing Zhang; Muguang Wang; Naihan Zhang; Xiaodi Huang; Desheng Chen

doi:10.1117/12.2585363

8 January 2021 A novel demodulation technique for identical weak fiber Bragg grating array sensing with improved performance

Jing Zhang, Muguang Wang, Naihan Zhang, Xiaodi Huang, Desheng Chen

Author Affiliations +

Proceedings Volume 11607, Optics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications; 116070D (2021) https://doi.org/10.1117/12.2585363
Event: Optics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications (OFO-3), 2020, Virtual Event, Online Only

Abstract

A novel demodulation method for the sensing system based on an identical weak fiber Bragg grating (IWFBG) array is proposed in this paper. With the help of a wavelength-swept laser, the reflection spectrum and transmission spectrum of an FBG can be mapped into two pulse signals with opposite polarity in time domain, both of which contain the wavelength information of the FBG. Therefore, improved signal intensity and sensing performance can be obtained when the reflection and transmission spectra of the FBG are both adopted for demodulation. A simulation has been done to a quasi-distributed sensing system based on the IWFBG array. The results show that the improvement of the signal intensity is related to the number of the FBGs with the same center Bragg wavelength. The location of the event is realized through the intensity comparison of the pulse signals, and the wavelength change of the FBG can be directly obtained by monitoring the time delay difference between the reference pulse and the sensing pulse.

Citation Download Citation

Jing Zhang, Muguang Wang, Naihan Zhang, Xiaodi Huang, and Desheng Chen "A novel demodulation technique for identical weak fiber Bragg grating array sensing with improved performance", Proc. SPIE 11607, Optics Frontiers Online 2020: Distributed Optical Fiber Sensing Technology and Applications, 116070D (8 January 2021); https://doi.org/10.1117/12.2585363

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