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., Chen, C, Wuilpart, M., Mégret, 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