Patent ID: 8805145

Claim:
A bend insensitive gradient index multimode light conducting fiber comprising a leakage mode dependent optical core diameter that is uniform over its length and a numerical aperture that is uniform over its length, a core, an inner cladding, a refraction index trench and an outer cladding, wherein the core includes a core radius R 1 , an alpha-refraction index profile and a core refraction index difference dn 1 with respect to the outer cladding, wherein the refraction index trench includes a refraction index trench radius R 3 and a trench refraction index difference dn 3 with respect to the outer cladding, wherein the outer cladding includes an outer cladding radius R 4 and a refraction index between 1.40 and 1.55, wherein for a light wavelength of 850 nm and an overfilled launch (OFL), the optical core diameter for a fiber length in a range between 2 m and 300 m decreases by less than 5% and the numerical aperture decreases by less than 2.5% and the curvature related attenuation increase for two turns and a curvature radius of 7.5 mm is less than 0.2 db.