Subfrequency noise signal extraction in fiber-optic strain sensors using postprocessing

Timothy T.Y. Lam; Malcolm B. Gray; Daniel A. Shaddock; David E. McClelland; Jong H. Chow

doi:10.1364/OL.37.002169

Subfrequency noise signal extraction in fiber-optic strain sensors using postprocessing

Timothy T.Y. Lam^*, Malcolm B. Gray, Daniel A. Shaddock, David E. McClelland, Jong H. Chow

^*Corresponding author for this work

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

11 Citations (Scopus)

Abstract

Laser frequency fluctuations typically limit the performance of high-resolution interferometric fiber strain sensors. Using time delay interferometry, we demonstrate a frequency noise immune fiber sensing system, where strain signals were extracted well below the noise floor normally imposed by the frequency fluctuations of the laser. Initial measurements show a reduction in the noise floor by a factor of 30, with strain sensitivities of a nanostrain/√Hz at 100 mHz and reaching 100 ps/√Hz at 1 Hz. Further characterization of the system indicates the potential for at least 4.5 orders of magnitude frequency fluctuation rejection.

Original language	English
Pages (from-to)	2169-2171
Number of pages	3
Journal	Optics Letters
Volume	37
Issue number	11
DOIs	https://doi.org/10.1364/OL.37.002169
Publication status	Published - 1 Jun 2012

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abstract = "Laser frequency fluctuations typically limit the performance of high-resolution interferometric fiber strain sensors. Using time delay interferometry, we demonstrate a frequency noise immune fiber sensing system, where strain signals were extracted well below the noise floor normally imposed by the frequency fluctuations of the laser. Initial measurements show a reduction in the noise floor by a factor of 30, with strain sensitivities of a nanostrain/√Hz at 100 mHz and reaching 100 ps/√Hz at 1 Hz. Further characterization of the system indicates the potential for at least 4.5 orders of magnitude frequency fluctuation rejection.",

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AU - Lam, Timothy T.Y.

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AU - Shaddock, Daniel A.

AU - McClelland, David E.

AU - Chow, Jong H.

PY - 2012/6/1

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N2 - Laser frequency fluctuations typically limit the performance of high-resolution interferometric fiber strain sensors. Using time delay interferometry, we demonstrate a frequency noise immune fiber sensing system, where strain signals were extracted well below the noise floor normally imposed by the frequency fluctuations of the laser. Initial measurements show a reduction in the noise floor by a factor of 30, with strain sensitivities of a nanostrain/√Hz at 100 mHz and reaching 100 ps/√Hz at 1 Hz. Further characterization of the system indicates the potential for at least 4.5 orders of magnitude frequency fluctuation rejection.

AB - Laser frequency fluctuations typically limit the performance of high-resolution interferometric fiber strain sensors. Using time delay interferometry, we demonstrate a frequency noise immune fiber sensing system, where strain signals were extracted well below the noise floor normally imposed by the frequency fluctuations of the laser. Initial measurements show a reduction in the noise floor by a factor of 30, with strain sensitivities of a nanostrain/√Hz at 100 mHz and reaching 100 ps/√Hz at 1 Hz. Further characterization of the system indicates the potential for at least 4.5 orders of magnitude frequency fluctuation rejection.

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JO - Optics Letters

JF - Optics Letters

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Subfrequency noise signal extraction in fiber-optic strain sensors using postprocessing

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