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.