The manufacturing process of long period fiber gratings (LPG) is investigated in order to enhance the sensitivity of the sensors to the surrounding refractive index, considering a specific mode and wavelength range. The LPG is inscribed in a standard single-mode fiber with a CO2 laser beam. It is found that the environment refractive index sensitivity is increased mainly due to the duty cycle of the grating. Results show an increase of 89% on the resonant wavelength shift for samples with refractive index varying from 1 to 1.42.
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