Abstract

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 $7.1\times {10}^{-12}\mathrm{ϵ}/\sqrt{\mathrm{Hz}}$, which corresponds to a sound pressure of $74\mathrm{\mu Pa}/\sqrt{\mathrm{Hz}}$ at 1 kHz limited by laser frequency noise and yielding a signal-to-noise ratio of $47\pm 2\mathrm{dB}$ with a 1 Pa drive at 1 kHz, in close agreement with modeled results.

© 2016 Optical Society of America

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