Simple demodulation method for FBG sensor using a wavelength selective detector

Fiber Bragg gratings (FBGs) have been widely used in sensor systems that have been attracted to be used in the sensor applications for their small size, good sensitivity, and inherent characteristics of direct wavelength shifts of applied perturbations, such as temperature, strain, etc. A WSD (wavelength selective detector) offers a simple detection scheme, and minimizes the use of optical components, since a WSD can accommodate both wavelength discrimination and optical detection functions by itself. Therefore simple and low cost implementation of FBG sensors can be expected. In this paper, we demonstrate the use of a WSD on FBG sensors for temperature sensing