Dual-peak long-period fiber gratings with enhanced refractive index sensitivity by finely tailored mode dispersion that uses the light cladding etching technique

Chen, Xianfeng F.; Zhou, Kaiming; Zhang, Lin and Bennion, Ian (2007). Dual-peak long-period fiber gratings with enhanced refractive index sensitivity by finely tailored mode dispersion that uses the light cladding etching technique. Applied optics, 46 (4), pp. 451-455.

Abstract

We have experimentally investigated the mode dispersion property and refractive index sensitivity of dual-peak long-period fiber gratings (LPGs) that were sensitized by hydrofluoric acid (HF) etching. The nature of the coupled cladding modes close to the dispersion turning point makes the dual-peak LPGs ultrasensitive to cladding property, permitting a fine tailoring of the mode dispersion and index sensitivity by the light cladding etching method using HF acid of only 1% concentration. As an implementation of an optical biosensor, the etched device was used to detect the concentration of hemoglobin protein in a sugar solution, showing a sensitivity as high as 20 nm/1%.

Uncontrolled Keywords: mode dispersion, refractive index sensitivity, dual-peak long-period fiber gratings, LPGs, sensitized, hydrofluoric acid etching, coupled cladding modes, dispersion turning point, cladding property, light cladding etching, cocentration, hemoglobin protein, sugar solution
Published Date: 2007-02

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