Linear FBG interrogation with a wavelength-swept fiber laser and a volume phase grating spectrometer

Hyunjin Kim; Minho Song

doi:10.1117/12.885089

18 May 2011 Linear FBG interrogation with a wavelength-swept fiber laser and a volume phase grating spectrometer

Hyunjin Kim, Minho Song

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77537Y (2011) https://doi.org/10.1117/12.885089
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

We propose a novel FBG (fiber Bragg grating) sensor system that uses a tunable wavelength laser and a volume phase grating spectrometer. The effect of nonlinear wavelength scanning and uneven power profile of the fiber laser, which substantially degrades the measurement accuracy, is minimized by using a spectrometer demodulation. The constructed sensor system showed linear output according to the Bragg wavelength variation, and showed much higher signal-to-noise ratio compared to the conventional spectrometer demodulation which used much dimmer broadband light sources.

Citation Download Citation

Hyunjin Kim and Minho Song "Linear FBG interrogation with a wavelength-swept fiber laser and a volume phase grating spectrometer", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77537Y (18 May 2011); https://doi.org/10.1117/12.885089

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