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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 36 — Dec. 20, 2010
  • pp: 6861–6867

Fourier analysis for hydrostatic pressure sensing in a polarization-maintaining photonic crystal fiber

Paul Childs, Allan C. L. Wong, H. Y. Fu, Yanbiao Liao, Hwayaw Tam, Chao Lu, and P. K. A. Wai  »View Author Affiliations

Applied Optics, Vol. 49, Issue 36, pp. 6861-6867 (2010)

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.We measured the hydrostatic pressure dependence of the birefringence and birefringent dispersion of a Sagnac interferometric sensor incorporating a length of highly birefringent photonic crystal fiber using Fourier analysis. Sensitivity of both the phase and chirp spectra to hydrostatic pressure is demonstrated. Using this analysis, phase-based measurements showed a good linearity with an effective sensitivity of 9.45 nm / MPa and an accuracy of ± 7.8 kPa using wavelength-encoded data and an effective sensitivity of 55.7 cm 1 / MPa and an accuracy of ± 4.4 kPa using wavenumber-encoded data. Chirp-based measurements, though nonlinear in response, showed an improvement in accuracy at certain pressure ranges with an accuracy of ± 5.5 kPa for the full range of measured pressures using wavelength-encoded data and dropping to within ± 2.5 kPa in the range of 0.17 to 0.4 MPa using wavenumber-encoded data. Improvements of the accuracy demonstrated the usefulness of implementing chirp-based analysis for sensing purposes.

© 2010 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
(120.5475) Instrumentation, measurement, and metrology : Pressure measurement

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 15, 2010
Revised Manuscript: November 8, 2010
Manuscript Accepted: November 8, 2010
Published: December 14, 2010

Paul Childs, Allan C. L. Wong, H. Y. Fu, Yanbiao Liao, Hwayaw Tam, Chao Lu, and P. K. A. Wai, "Fourier analysis for hydrostatic pressure sensing in a polarization-maintaining photonic crystal fiber," Appl. Opt. 49, 6861-6867 (2010)

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