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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 16 — Aug. 15, 2012
  • pp: 3450–3452

Gas refractometry based on an all-fiber spatial optical filter

Susana Silva, L. Coelho, R. M. André, and O. Frazão  »View Author Affiliations

Optics Letters, Vol. 37, Issue 16, pp. 3450-3452 (2012)

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A spatial optical filter based on splice misalignment between optical fibers with different diameters is proposed for gas refractometry. The sensing head is formed by a 2 mm long optical fiber with 50 μm diameter that is spliced with a strong misalignment between two single-mode fibers (SMF28) and interrogated in transmission. The misalignment causes a Fabry–Perot behavior along the reduced-size fiber and depending on the lead-out SMF28 position, it is possible to obtain different spectral responses, namely, bandpass or band-rejection filters. It is shown that the spatial filter device is highly sensitive to refractive index changes on a nitrogen environment by means of the gas pressure variation. A maximum sensitivity of 1390nm/RIU for the bandpass filter was achieved. Both devices have shown similar temperature responses with an average sensitivity of 25.7pm/°C.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 17, 2012
Revised Manuscript: July 2, 2012
Manuscript Accepted: July 3, 2012
Published: August 13, 2012

Susana Silva, L. Coelho, R. M. André, and O. Frazão, "Gas refractometry based on an all-fiber spatial optical filter," Opt. Lett. 37, 3450-3452 (2012)

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