Temperature sensor based on ge-doped microstructured fibers

Abstract

The fundamental mode cutoff properties of Ge-doped microstructured fibers, filled with a liquid, permit the implementation of wavelength- and amplitude-encoded temperature sensors with an ultra-high sensitivity. The cutoff wavelength changes with temperature, and the thermo-optic coefficient of the liquid determines the sensitivity of the sensor. Sensitivity as high as 25 nm/ °C is reported. In addition, simple amplitude interrogation techniques can be implemented using the same sensor heads. Copyright © 2009 Salvador Torres-Peiró et al.