827 nm Bragg grating sensor in multimode microstructured polymer optical fibre

Reported is the fabrication and characterisation of a Bragg grating in multimode microstructured polymer optical fibre with a Bragg wavelength of 827 nm. This is the smallest Bragg wavelength reported to date for a polymer optical fibre grating, and the relatively low loss of the fibre at this wavelength considerably enhances the utility of the device compared to gratings at longer wavelengths.