Zero drift suppression method of a distributed feedback fiber laser hydrophone

A zero drift suppression method of a distributed feedback (DFB) fiber laser hydrophone is studied. The working principle of the DFB fiber laser hydrophone and the cause, phenomenon, and influence of zero drift are briefly introduced. The design idea and implementation method of the zero drift suppression method are described in detail. The differential cross-multiplication demodulation method is improved by adding closed-loop feedback control to the appropriate stage, and the zero drift problem is solved without any hardware modification. Simulation analysis and experiments are performed to verify the feasibility and effectiveness of the method. The experimental results show that the zero drift suppression method can effectively stabilize the static operating point of the DFB fiber laser hydrophone.