VERY BROAD BANDWIDTH MULTIMODE OPTICAL FIBRE WITH AN OPTIMIZED CORE-CLADDING INTERFACE AND REDUCED CLADDING EFFECT

摘要

A multimode optical fibre comprising an optical core surrounded by an outer optical cladding, the optical core from the centre to the periphery: a central core having a radius (r1) and an alpha-index profile with respect to an outer optical cladding, a depressed trench situated at the periphery of the central core having a width (wt) and a refractive index difference (Δnt) with respect to the outer optical cladding, in which the diameter of the central core has a value of 50 ± 3 µm, the width (wt) of the depressed trench is comprised between 0.5 µm and 2 µm, and the refractive index difference (Δnt) of the depressed trench with respect to the outer optical cladding is comprised between - 4×10-3 and -1 ×10-3.