Intensity-modulated refractometer with long period fiber grating cascaded by chirped fiber grating

Jingyi Yang; Xinyong Dong; Li Han Chen; Yangzi Zheng; Chi Chu Chan; Ping Lam So

doi:10.1117/12.2194765

28 September 2015 Intensity-modulated refractometer with long period fiber grating cascaded by chirped fiber grating

Jingyi Yang, Xinyong Dong, Li Han Chen, Yangzi Zheng, Chi Chu Chan, Ping Lam So

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96346F (2015) https://doi.org/10.1117/12.2194765
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

An intensity-modulated refractometer is proposed and experimentally demonstrated by using a long period fiber grating (LPG) cascaded with a chirped-fiber Bragg grating (CFBG). The reflection wavelength band of the CFBG was properly selected to contain the most sensitive spectral part of the LPG. As a result, intensity of the reflected signal was modulated linearly by refractive index (RI) of surrounding liquid outside the LPG. RI measurement in a range from 1.33 to ~1.45 was realized with enhanced sensitivity up to 48.93 μW/R.I.U.

Citation Download Citation

Jingyi Yang, Xinyong Dong, Li Han Chen, Yangzi Zheng, Chi Chu Chan, and Ping Lam So "Intensity-modulated refractometer with long period fiber grating cascaded by chirped fiber grating", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96346F (28 September 2015); https://doi.org/10.1117/12.2194765

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