Integration of miniature Fabry–Perot fiber optic sensor with FBG for the measurement of temperature and strain

A sensor has been fabricated by the integration of a fiber Bragg gating sensor (FBGs) with a fiber Fabry–Perot (F-P) sensor fabricated by etching method. In the integrated sensor, the FBG was used to measure temperature, while the fiber Fabry–Perot interferometer sensor (FFPIs) was used for strain measurement. Wavelength decoding for FBG and peak tracking for FFPI was employed for demodulation, respectively. The result showed that the temperature and strain sensitivity for the integrated sensor is ~ 2.7 pm/μεand ~ 9.3 pm/°C, respectively.

Research Highlights
► A fiber Fabry-Perot interfermeter sensor has been fabricated with etching and normal fusion.
► A fiber Bragg grating is integrated with the fiber Fabry-Perot sensor.
► Wavelength decoding for FBG and peak tracking for fiber Fabry-Perot interfermeter was imployed for demodulation, respectively.
► The temperature and strain sensitivity for the integrated sensor is ~2.7 pm/and ~9.3 pm/°C, respectively.