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

摘要

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 α_i graded-index profile with α_i≥1, and the optical core having a radius R_1i, where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region of depressed refractive index n_trenchi, called a trench, surrounding the optical core. According to embodiments of the invention, for all optical fibers in said link, said optical core radius R_1i and said length L_i are chosen such that R_1i≥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.