A novel solgel process for making porous silica fiber and doping the fiber core with sensing material is described. A CoCl<sub>2</sub> -doped solgel fiber was fabricated and was used to construct an active-core optical fiber moisture sensor. Test results show that the sensitivity of the active-core optical fiber sensor is much higher than that of an evanescent-wave-based optical fiber sensor.
© 2002 Optical Society of America
Shiquan Tao, Christopher B. Winstead, Jagdish P. Singh, and Rajeev Jindal, "Porous solgel fiber as a transducer for highly sensitive chemical sensing," Opt. Lett. 27, 1382-1384 (2002)