High sensitivity of dual resonant peaks of long-periodfibre grating to surrounding refractive index changes
- 2 September 1999
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 35 (18) , 1580-1581
- https://doi.org/10.1049/el:19991040
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
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