All-optical low noise fiber Bragg grating microphone

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

doi:10.1364/AO.55.005570

All-optical low noise fiber Bragg grating microphone

Chathura P. Bandutunga^*, Roland Fleddermann, Malcolm B. Gray, John D. Close, Jong H. Chow

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

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 × 10^-12 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.

Original language	English
Pages (from-to)	5570-5574
Number of pages	5
Journal	Applied Optics
Volume	55
Issue number	21
DOIs	https://doi.org/10.1364/AO.55.005570
Publication status	Published - 20 Jul 2016

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title = "All-optical low noise fiber Bragg grating microphone",

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 H{\"a}nsch-Couillaud readout technique to provide necessary sensitivity. We achieved a noise-equivalent strain sensitivity of 7.1 × 10-12 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.",

author = "Bandutunga, {Chathura P.} and Roland Fleddermann and Gray, {Malcolm B.} and Close, {John D.} and Chow, {Jong H.}",

note = "Publisher Copyright: {\textcopyright} 2016 Optical Society of America.",

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T1 - All-optical low noise fiber Bragg grating microphone

AU - Bandutunga, Chathura P.

AU - Fleddermann, Roland

AU - Gray, Malcolm B.

AU - Close, John D.

AU - Chow, Jong H.

PY - 2016/7/20

Y1 - 2016/7/20

N2 - 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 × 10-12 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.

AB - 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 × 10-12 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.

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U2 - 10.1364/AO.55.005570

DO - 10.1364/AO.55.005570

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VL - 55

SP - 5570

EP - 5574

JO - Applied Optics

JF - Applied Optics

IS - 21

ER -

All-optical low noise fiber Bragg grating microphone

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