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

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4 Author(s)
Xianfeng Chen ; Photonics Res. Group, Aston Univ., Birmingham, UK ; Kaiming Zhou ; Lin Zhang ; Bennion, I.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 4 )