All-glass single-mode microstructured optical fibres with a large-diameter core and low bending losses

All-glass microstructured optical fibres (MOFs) with a core 20 mu m in diameter and two rings of circular fluorine-doped silica glass elements with a reduced refractive index, different diameters, and different distances between them are theoretically studied. The properties of these MOFs arc numerically analysed using the finite element method. The leakage losses for the fundamental and higher-order modes in the spectral range 0.75-1.65 mu m are calculated for straight and bent MOFs. It is shown that the considered MOF design allows single-mode operation in the range 0.98-1.26 mu m at a bending radius of down to 0.08 in, the leakage losses for the bent MOF at a wavelength of 1.05 mu m being 0.046 dB m(-1).

Automated summary

Theoretical study on all-glass microstructured optical fibers (MOFs) with varying diameters and distances of circular fluorine-doped silica glass elements revealed potential for single-mode operation with low leakage losses at specific wavelengths. Numerical analysis using the finite element method indicated the possibility of achieving desired optical properties in the studied MOF design.