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Optics Express

Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5736–5742

Reflective tilted fiber Bragg grating refractometer based on strong cladding to core recoupling

Tuan Guo, Hwa-Yaw Tam, Peter A. Krug, and Jacques Albert  »View Author Affiliations


Optics Express, Vol. 17, Issue 7, pp. 5736-5742 (2009)
http://dx.doi.org/10.1364/OE.17.005736


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Abstract

A novel in-fiber structure for power-referenced refractometry with the capability to measure surrounding refractive index (SRI) as low as 1.33 is proposed and demonstrated. A short optical fiber stub containing a weakly tilted Bragg grating is spliced to another fiber with a large lateral offset. The reflection from this structure occurs in two well-defined wavelength bands, the Bragg reflected core mode and the cladding modes. The cladding modes reflect different amounts of power as the SRI changes, while the core-mode reflection from the same weakly tilted FBG remains unaffected by the SRI. The power reflected in the core mode band can be used as a reliable reference to cancel out any possible power fluctuations. The proposed refractometer with improved sensitivity for low SRI measurement together with the tip-reflection sensing feature, is a good candidate for sensing in chemical and biological applications.

© 2009 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 2, 2009
Revised Manuscript: March 19, 2009
Manuscript Accepted: March 20, 2009
Published: March 25, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Tuan Guo, Hwa-Yaw Tam, Peter A. Krug, and Jacques Albert, "Reflective tilted fiber Bragg grating refractometer based on strong cladding to core recoupling," Opt. Express 17, 5736-5742 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-7-5736


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