Abstract
In vibration sensing by use of a FBG based on intensity modulation, light incident on a FBG is narrow-band light tuned to the slope in a transmittance spectrum of the FBG. Since the sensor sensitivity is proportional to the slope of the spectrum curve, enhancement of the sensitivity requires steeper slope of the curve. In this paper, vibration sensing by use of Fabry-Perot interferometer with FBG reflectors (FBG-FPI) is numerically investigated. Because a transmittance spectrum of an FBG-FPI has steeper slope, the FBG-FPI can yield improvement in sensitivity of the sensing.
