Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10344005 | Optical Fiber Technology | 2014 | 5 Pages |
Abstract
A fiber Bragg grating based (FBG-based) Fabry-Perot (FP) sensor system utilizing multiple reflections between two strong FBGs with different reflectiveties to enhance the sensitivity is proposed. The different interference signals are obtained by using different multiple-path-matched Michelson interferometers (MIs). The system is lighted by the ultra-narrow line width erbium-doped fiber ring laser and the signal is demodulated by phase-generated carrier (PGC) scheme. The method to choose the optimal parameters of the FBG-based asymmetric FP sensor and the different matching MIs is analyzed. The experimental results show that each matching MI can steadily enhance the sensitivity of the demodulated signal in the bandwidth of 80-8000Â Hz. The sensitivity of the system can be enhanced about 19.1Â dB when the light reflects nine times between the two FBGs. Further more, this system can be used to extend the dynamic range and the effective working bandwidth and so on.
Related Topics
Physical Sciences and Engineering
Computer Science
Computer Networks and Communications
Authors
Wei Wang, Zhengliang Hu, Mingxiang Ma, Huizu Lin, Yongming Hu,