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Wavelength division multiplexing addressed four-element fiber optical laser hydrophone array.

¹Department of Optical Engineering, Beijing Institute of Technology, Beijing 100081, China. bitjy@bit.edu.cn

|May 22, 2007

Summary

A new fiber Bragg grating hydrophone array system uses a novel passive demodulation technique. This system achieves high sensitivity for underwater acoustic detection, with a minimum detectable wavelength perturbation of 7.2x10(-7) pm/radicalHz above 200 Hz.

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Area of Science:

Photonics and Sensor Technology
Underwater Acoustics
Optical Sensing

Background:

Hydrophone arrays are crucial for underwater acoustic monitoring.
Existing demodulation techniques can be complex and costly.
Fiber optic sensing offers advantages in harsh environments.

Purpose of the Study:

To develop a novel passive demodulation technique for a fiber Bragg grating hydrophone array.
To enhance the sensitivity and operational range of hydrophone systems.
To introduce a new approach using wavelength division multiplexers (WDMs).

Main Methods:

A four-element hydrophone array integrated with a fiber Bragg grating laser system.
Demodulation combining a 3x3 coupler-based interferometer and three wavelength division multiplexers (WDMs).

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A unique arithmetic method for signal processing.

Main Results:

Achieved a minimum detectable wavelength perturbation of approximately 7.2x10(-7) pm/radicalHz.
The system demonstrated effective performance for frequencies greater than 200 Hz.
The operational frequency limit is determined by the electronic components.

Conclusions:

The developed system represents a novel passive approach for hydrophone array sensing.
The combination of WDMs and interferometry offers a unique and effective demodulation strategy.
This technology holds potential for improved underwater acoustic detection.