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Detector for an optical-fiber acoustic sensor using dynamic holographic interferometry.

T J Hall¹, M A Fiddy, M S Ner

¹Department of Physics, Queen Elizabeth College, Campden Hill Road, London W8 7AH, UK.

|August 25, 2009

Summary

A new method uses a dynamic hologram to detect acoustic phase modulation in multimode optical fibers. This technique offers performance similar to single-mode sensors but with easier alignment.

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Area of Science:

Optics
Photonics
Fiber Optic Sensing

Background:

Acoustic waves can modulate light phase in optical fibers.
Detecting this phase modulation is crucial for sensing applications.
Traditional interferometric sensors often require precise alignment.

Purpose of the Study:

To develop a method for linearly detecting acoustically induced phase modulation in multimode optical fibers.
To propose the use of a dynamic hologram as a reference beam.
To achieve performance comparable to monomode sensors with relaxed alignment.

Main Methods:

Utilizing an interferometer with an unmodulated replica of the fiber beam as a reference.
Employing a dynamic hologram to generate the reference beam.

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Propagating coherent light through a multimode optical fiber subjected to acoustic influence.

Main Results:

Demonstrated linear detection of acoustically induced phase modulation.
Showcased the effectiveness of a dynamic hologram as a reference.
Achieved performance comparable to monomode interferometric sensors.

Conclusions:

The proposed technique enables effective detection of acoustic phase modulation in multimode fibers.
Dynamic holograms offer a practical solution for generating reference beams in interferometry.
This method provides a robust and less alignment-sensitive alternative for fiber optic sensing.