TAPERED MICROSTRUCTURED OPTICAL FIBRE WITH SELECTIVE TRANSMISSION FOR OPTICAL FIBRE SENSORS AND PRODUCTION METHOD THEREOF

摘要

The invention relates to tapered microstructured optical fibres having a large mode area and comprising collapsed holes in the area with the smallest diameter (waist), which are intended for optical fibre sensors, and to a method of producing same. The air holes are collapsed by tapering the fibres using a slow and hot method. As a result of said nonadiabatic method the fundamental mode of a microstructured fibre is coupled to multiple modes of the solid waist of the tapered fibre. The transmission spectra of the tapered microstructured optical fibres exhibit several interference peaks owing to the beating between the above-mentioned modes. Said interference peaks are sensitive to the refraction index, micro-stresses, high temperatures and other magnitudes and, as such, the structure can be used to detect different parameters.