Optical fiber plays significant roles in optical sensors. The FBG sensors exceed other conventional electric sensors in many aspects, for instance, immunity to electromagnetic interference, light weight, compact size, stability, flexibility, high temperature tolerance and resistant to harsh environment. This paper provides the operating principle, implementation of a bending FBG sensor head and spectral characterization study. Detection of the power induced by bending changes controlled by wind speed is achieved. Uniform Fiber Bragg Grating (FBG) anemometer sensor and single mode optical fiber (SMF) anemometer sensors based on single mode fibers were implemented and investigated due to measurement of the output power. It has been shown from the results that the FBG is very sensitive to variations in bending over a radius of curvature range of 2.5 - 100 mm, which controlled by wind speed and the SMF over a radius of curvature range of 5 - 15 mm also observed from the results, the relation between the power and radius of curvature was an exponential relationship for both FBG and SMF.

Keywords: Single Mode Optical Fiber (SMF); Fiber Bragg Grating (FBG); Bending; Anemometer Sensor;