A novel Michelson Fabry–Perot hybrid interference sensor based on the micro-structured fiber

•By integrating a Michelson interferometer in a two-core fiber and a Fabry–Perot interferometer in a micro silica-capillary, we produce the Michelson Fabry–Perot hybrid interference sensor.•The hybrid fiber interference sensor can achieve the measurement of the axial strain and radial bending simultaneously.•.The measurement sensitivity of the axial train is 0.015 nm/με and the measurement sensitivity of the radial bending is 1.393 nm/m–1.

We propose and demonstrate a novel Michelson Fabry–Perot hybrid fiber interference sensor. By integrating a Michelson interferometer in a two-core fiber and a Fabry–Perot interferometer in a micro silica-capillary, we produce the Michelson Fabry–Perot hybrid interference sensor. Owing to the structure characteristic of the micro-structured fiber, this hybrid fiber interference sensor can achieve the measurement of the axial strain and radial bending simultaneously. The measurement sensitivity of the axial train is 0.015 nm/με and the measurement sensitivity of the radial bending is 1.393 nm/m−1.