In this letter, a novel demodulation technique based on the monitoring of the polarization-dependent loss in a 1-nm wavelength range is proposed to measure the surrounding refractive index by means of weakly tilted fiber Bragg gratings. A 110-3 refractive index resolution as well as a temperature-insensitive behaviour are reported.

Fiber Bragg gratings, Polarization, Refractive index, Sensor
IEEE Photonics Technology Letters
Department of Electronics

Caucheteur, C. (Christophe), Bette, S. (S.), Chen, C, Wuilpart, M. (M.), Mégret, P. (P.), & Albert, J. (2008). Tilted fiber Bragg grating refractometer using polarization-dependent loss measurement. IEEE Photonics Technology Letters, 20(24), 2153–2155. doi:10.1109/LPT.2008.2007745