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All-optical low noise fiber Bragg grating microphone

Bandutunga, Chathura P; Fleddermann, Roland; Gray, Malcolm B; Close, John D; Chow, Jong H


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<sup>-12</sup>  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...[Show more]

CollectionsANU Research Publications
Date published: 2016-07-13
Type: Journal article
Source: Applied optics
DOI: 10.1364/AO.55.005570
Access Rights: Open Access


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