Few mode optical fiber links for space division multiplexing having trenched fibers with high leak losses for leaky modes and low bend losses

Abstract

The invention relates to an optical link comprising N optical fibers, with N≥2. Each optical fiber comprises an optical core and an optical cladding surrounding the optical core, the optical core having a single αgraded-index profile with α≥1, and the optical core having a radius R, where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region of depressed refractive index n, called a trench, surrounding the optical core. According to embodiments of the invention, for all optical fibers in said link, said optical core radius Rand said length Lare chosen such that R≥13.5 μm and so as to satisfy a criterion C of quality. Thus, the invention provides a few-mode optical fiber link, which allow guiding an increased number of LP modes as compared to prior art FMF links, while reaching low Differential Mode Group Delay.