Optical chemsensor based on etched tilted Bragg grating structures in multimode fibre

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  • Xianfeng Chen
  • K. Zhou
  • L. Zhang
  • I. Bennion
We present a simple optical chemsensor device based on tilted Bragg grating structures ultraviolet-inscribed in conventional multimode fiber and sensitized by a hydrofluoric (HF)-etching treatment. The transition behaviors of fiber Bragg gratings (FBGs) from normal to tilted structures and their spectral evolution under HF-etching have been studied. The etched devices have been used to measure the concentrations of sugar solution, showing a potential capability of detecting concentration changes as small as <0.5%, which is an order of magnitude lower than that of previously reported FBG sensors in single-mode fiber.
Original languageEnglish
Pages (from-to)864-866
JournalIEEE Photonics Technology Letters
Volume17
Issue number4
DOIs
Publication statusPublished - 4 Apr 2005
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