Hydrophone using Faraday rotating mirror Michelson interferometer 1310/1550nm

The Faraday rotator mirror (FRM) method is an important approach to suppress polarization induced signal fading in interferometric fiber optic sensing systems. In theory, it can completely eliminate polarization fading. However, due to the imprecise rotation angle of the selected FRM, residual polarization induced phase noise may occur in the system The Faraday rotating mirror Michelson interferometer used for hydrophones can control the length difference between the two arms within 1mm, achieving low-cost miniaturization design.