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

Tuan Guo, Hwa Yaw Tam, Peter A. Krug, Jacques Albert

Research output: Journal article publicationJournal articleAcademic researchpeer-review

159 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)5736-5742
Number of pages7
JournalOptics Express
Issue number7
Publication statusPublished - 30 Mar 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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