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Sensors 2010, 10(11), 9698-9711; doi:10.3390/s101109698
Article

Hydrostatic Pressure Sensing with High Birefringence Photonic Crystal Fibers

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Received: 13 September 2010 / Revised: 8 October 2010 / Accepted: 12 October 2010 / Published: 1 November 2010
(This article belongs to the Section Physical Sensors)
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Abstract

The effect of hydrostatic pressure on the waveguiding properties of high birefringence photonic crystal fibers (HiBi PCF) is evaluated both numerically and experimentally. A fiber design presenting form birefringence induced by two enlarged holes in the innermost ring defining the fiber core is investigated. Numerical results show that modal sensitivity to the applied pressure depends on the diameters of the holes, and can be tailored by independently varying the sizes of the large or small holes. Numerical and experimental results are compared showing excellent agreement. A hydrostatic pressure sensor is proposed and demonstrated using an in-fiber modal interferometer where the two orthogonally polarized modes of a HiBi PCF generate fringes over the optical spectrum of a broad band source. From the analysis of experimental results, it is concluded that, in principle, an operating limit of 92 MPa in pressure could be achieved with 0.0003% of full scale resolution.
Keywords: photonic crystal fiber; high birefringence; hydrostatic pressure sensing; air-silica structured fiber; microstructured fiber photonic crystal fiber; high birefringence; hydrostatic pressure sensing; air-silica structured fiber; microstructured fiber
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fávero, F.C.; Quintero, S.M.M.; Martelli, C.; Braga, A.M.; Silva, V.V.; Carvalho, I.C.S.; Llerena, R.W.A.; Valente, L.C.G. Hydrostatic Pressure Sensing with High Birefringence Photonic Crystal Fibers. Sensors 2010, 10, 9698-9711.

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