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By using two-dimensional fast Fourier transforms, the focal point position was defined and shifted in the radial direction.A magnetic field sensor based on a mechanical amplifier structure is proposed and experimentally demonstrated. The sensor is composed of a 3×3 coupler-based Michelson interferometer. The magnetic field transducer is a mechanical amplifier structure, in which a TbDyFe rod is wrapped by the polarization-maintaining (PM) fiber. The deformation produced by the TbDyFe rod is amplified and transferred to the PM fiber, cau