Title :
High sensitivity of dual resonant peaks of long-period fibre grating to surrounding refractive index changes
Author :
Shu, Xuewen ; Zhu, Xuemei ; Jiang, Shan ; Shi, Wei ; Huang, Dexiu
Author_Institution :
Dept. of Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China
fDate :
9/2/1999 12:00:00 AM
Abstract :
The spectral response of the dual resonant peaks of a 100 μm period fibre grating to surrounding refractive index (SRI) from n=1 to 1.74 has been investigated. The two peaks were found to shift in opposite directions over -180 and +300 nm, respectively, as the SRI changed. A novel chemical sensing scheme with enhanced sensitivity based on the measurement of the separation of the two peaks instead of a shift in a single peak is also presented
Keywords :
chemical sensors; diffraction gratings; fibre optic sensors; refractive index; 100 micron; chemical sensing scheme; dual resonant peaks; long-period fibre grating; refractive index changes; spectral response; surrounding refractive index;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19991040
