All-optical low noise fiber Bragg grating microphone

We present an all-fiber design for a microphone using a fiber Bragg grating Fabry-Perot resonator attached to a diaphragm transducer. We analytically model and verify the fiber-diaphragm mechanical interaction, using the Hänsch-Couillaud readout technique to provide necessary sensitivity. We achieve...

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Bibliographic Details
Published in:Applied optics (2004) 2016-07, Vol.55 (21), p.5570-5574
Main Authors: Bandutunga, Chathura P, Fleddermann, Roland, Gray, Malcolm B, Close, John D, Chow, Jong H
Format: Article
Language:English
Subjects:
Bragg gratings
Fibers
Lasers
Low noise
Mathematical analysis
Microphones
Signal to noise ratio
Transducers
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Summary:We present an all-fiber design for a microphone using a fiber Bragg grating Fabry-Perot resonator attached to a diaphragm transducer. We analytically model and verify the fiber-diaphragm mechanical interaction, using the Hänsch-Couillaud readout technique to provide necessary sensitivity. We achieved a noise-equivalent strain sensitivity of 7.1×10   ϵ/Hz, which corresponds to a sound pressure of 74  μPa/Hz at 1 kHz limited by laser frequency noise and yielding a signal-to-noise ratio of 47±2  dB with a 1 Pa drive at 1 kHz, in close agreement with modeled results.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.55.005570