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 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]
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