The fabrication of long-period grating in multimode polymer optical fibers for low refractive index for liquids sensing is reported in this paper. Good sensitivity to sugar concentration on water is obtained.

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In this work, the regeneration process of FBGs written into both standard and bend-insensitive fiber has been studied. Several dopants present in these fibers lead to different regeneration properties which, based on previous experiments, have been tested, paying special attention to the regeneration temperature. The achieved results suggest a reduction on the regeneration temperature for FBGs written into bend-insensitive fiber that favors mechanical properties of silica.

By using a fiber laser chirp pulse amplifier femtosecond laser system, long period gratings structures are micro-machined on one side of a Plastic Optical Fiber. Very narrow and high attenuation transmission bands can be obtained.