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

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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