WEAKLY-COUPLED FEW MODE OPTICAL FIBERS FOR MODE DIVISION MULTIPLEXING AND CORRESPONDING OPTICAL TRANSMISSION SYSTEM

摘要

The invention relates to a few-mode optical fiber comprising a core's refractive-index profile Δn(r) of trapezoid-like shape, the optical core having a center part of radius R1 and a transition part ranges from the radius R1 to a radius R2, such that R2 R1 with R2 between 6.8 and 11.5 µm, said refractive-index profile being defined by:- a surface integral of the core index profile of between 180×10^-3 and 270×10^-3 µm;- a transition slope S of between 1.7×10^-3 and 12×10^-3 µm^-1;with Δn1 and Δn2 the refractive-index difference respectively of the center part of the optical core and of the cladding part adjacent to the optical core, with respect to the outer optical cladding.