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Title: Reflective tilted fiber Bragg grating refractometer based on strong cladding to core recoupling
Authors: Guo, T
Tam, HY 
Krug, PA
Albert, J
Keywords: Fiber Bragg gratings
Optical instruments
Refractive index
Issue Date: 30-Mar-2009
Publisher: Optical Society of America
Source: Optics express, 30 Mar. 2009, v. 17, no. 7, p. 5736-5742 How to cite?
Journal: Optics express 
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.
ISSN: 1094-4087
DOI: 10.1364/OE.17.005736
Rights: © 2009 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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