Vibration Sensor Based On Graphene-coated Excessively Tilted Fiber Grating

Abstract

We report the bending strain and low frequency vibration characteristics of few-layers graphene-coated excessively tilted fiber grating (ExTFG), which enhanced the mechanical characteristics at the expense of sensitivity. The experimental results show that, in the curvature range of 0~0.5 m-1, bending strain sensitivities of transverse electric (TE) and transverse magnetic (TM) modes based on wavelength variation are -2.78 nm/m-1 and -1.49 nm/m-1, respectively, and those based on intensity variation are -0.11 dB/m-1 and -0.24 dB/m-1, respectively. For the low frequency vibration, the maximum acceleration sensitivities of TE and TM modes at 3dB points are S TE =46.64 mv/g and S TM =73.84 mv/g, respectively, which also the larger than those of other wavelength positions. The proposed graphene-coated ExTFG may endow potential application prospects in optical fiber strain, torsion and vibration sensors.