Curvature and temperature sensing based on a dual-frequency OEO using cascaded TCFBG-FP and SMFBG-FP cavities

•The OEO-based sensor can do both curvature and temperature sensing.•Sensitivities as high as −1.19 GHz/m−1 and 1.14 GHz/oC are achieved, respectively.•The frequencies of the oscillating signals show good linearity with curvature and temperature.•The proposed sensor is a promising candidate in high-quality and real-time sensing applications.