Abstract
In this paper, the graphene tilted Bragg fiber grating (TFBG) sensor is fabricated by pulsed laser deposition (PLD). TFBG's sensitivity to external environmental changes can be improved to a certain extent by coating graphene in TFBG area. The experimental results show that the strain sensitivity of TFBG coated with graphene is 0.48 nm/mε, which is 1.6 times of the strain sensitivity of bare grating. The temperature sensitivity of TFBG coated with graphene is 0.1 nm/℃as same as bare grating. Based on the dual-wavelength matrix method, the Sagnac loop is used to cascade the coated tilted grating with The Bragg grating (FBG), and the temperature and stress sensing characteristics are measured simultaneously.
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