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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 11 — Jun. 1, 2012
  • pp: 2169–2171

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

Timothy T.-Y. Lam, Malcolm B. Gray, Daniel A. Shaddock, David E. McClelland, and Jong H. Chow  »View Author Affiliations

Optics Letters, Vol. 37, Issue 11, pp. 2169-2171 (2012)

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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 100ps/Hz at 1 Hz. Further characterization of the system indicates the potential for at least 4.5 orders of magnitude frequency fluctuation rejection.

© 2012 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 10, 2012
Revised Manuscript: March 26, 2012
Manuscript Accepted: April 2, 2012
Published: June 1, 2012

Timothy T.-Y. Lam, Malcolm B. Gray, Daniel A. Shaddock, David E. McClelland, and Jong H. Chow, "Subfrequency noise signal extraction in fiber-optic strain sensors using postprocessing," Opt. Lett. 37, 2169-2171 (2012)

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