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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 23 — Nov. 18, 2013
  • pp: 29073–29082

High-refractive-index transparent coatings enhance the optical fiber cladding modes refractometric sensitivity

Jean-Michel Renoirt, Chao Zhang, Marc Debliquy, Marie-Georges Olivier, Patrice Mégret, and Christophe Caucheteur  »View Author Affiliations


Optics Express, Vol. 21, Issue 23, pp. 29073-29082 (2013)
http://dx.doi.org/10.1364/OE.21.029073


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Abstract

The high order cladding modes of standard single mode optical fiber appear in quasi-degenerate pairs corresponding to mostly radially or mostly azimuthally polarized light. In this work, we demonstrate that, in the presence of a high-refractive-index coating surrounding the fiber outer surface, the wavelength spacing between the orthogonally polarized cladding modes families can be drastically enhanced. This behavior can be advantageously exploited for refractometric sensing purposes. For this, we make use of tilted fiber Bragg gratings (TFBGs) as spectral combs to excite the orthogonally polarized cladding modes families separately. TFBGs were coated with a nanometer-scale transparent thin film characterized by a refractive index value close to 1.9, well higher than the one of pure silica. This coating brings two important assets: an ~8-fold increase in refractometric sensitivity is obtained in comparison to bare TFBGs while the sensitivity is extended to surrounding refractive index (SRI) values above 1.45.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 6, 2013
Revised Manuscript: November 6, 2013
Manuscript Accepted: November 11, 2013
Published: November 15, 2013

Citation
Jean-Michel Renoirt, Chao Zhang, Marc Debliquy, Marie-Georges Olivier, Patrice Mégret, and Christophe Caucheteur, "High-refractive-index transparent coatings enhance the optical fiber cladding modes refractometric sensitivity," Opt. Express 21, 29073-29082 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-23-29073


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