Enhanced sensitivity fibre optic long period grating temperature sensor

Surrounding a long period grating (LPG), fabricated in a standard optical fibre, with a material with a high thermo-optic coefficient enhances the temperature sensitivity of the LPG. Temperature sensitivities as high as 19 nm degreesC(-1) are reported over a temperature range of 1.1 degreesC. The temperatures at which the LPG exhibits enhanced sensitivity may be tailored by a suitable choice of material.