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

Chen, Xianfeng F., Zhou, Kaiming, Zhang, Lin and Bennion, Ian (2005). Optical chemsensor based on etched tilted Bragg grating structures in multimode fiber. IEEE photonics technology letters, 17 (4), pp. 864-866.

Abstract

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.

Uncontrolled Keywords: chemsensor, etching, fiber Bragg grating, multimode fiber, tilted grating structure, FBG, FBG sensors, HF, HF-etching, etched tilted Bragg grating structures, hydrofluoric etching treatment, optical chemosensor, sugar solution
Published Date: 2005-04
Authors: Chen, Xianfeng F.
Zhou, Kaiming
Zhang, Lin
Bennion, Ian

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