The project aims to study an anular guide recorded with a Bragg grating to explore its sensing properties, such as temperature and stress, changing only geometric parameters (radius) and the core refractive index. It is proposed to develop a structure where the Bragg wavelenght is insensive to temperature changes. Therefore, simmulations were made using the COMSOL software and the samples were manufactured, so the measures of the Bragg wavelenght versus temperature were done.