Zero drift suppression method of a distributed feedback fiber laser hydrophone

Area of Science:

• Photonics
• Acoustics
• Fiber Optic Sensing

Background:

• Distributed feedback (DFB) fiber laser hydrophones are sensitive acoustic sensors.
• Zero drift is a significant issue affecting the static operating point and accuracy of these hydrophones.
• Understanding the causes and phenomena of zero drift is crucial for developing mitigation strategies.

Purpose of the Study:

• To investigate and propose a method for suppressing zero drift in DFB fiber laser hydrophones.
• To address the zero drift problem without requiring hardware modifications.

Main Methods:

• The study focuses on improving the differential cross-multiplication demodulation method.
• Closed-loop feedback control is integrated into the demodulation process.
• Simulation analysis and experimental validation were conducted.

Main Results:

• The proposed method effectively eliminates zero drift in DFB fiber laser hydrophones.
• Experimental results confirm the stabilization of the hydrophone's static operating point.
• The technique achieves zero drift suppression without any hardware changes.

Conclusions:

• The improved demodulation method with closed-loop feedback is a viable solution for DFB fiber laser hydrophone zero drift.
• This approach offers an effective and hardware-independent way to enhance hydrophone stability and performance.