Few-mode optical fiber links for space multiplexing

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 αi graded-index profile with αi≧1, and the optical core having a radius R1i, where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region of depressed refractive index ntrenchi, called a trench, surrounding the optical core. According to embodiments of the invention, for all optical fibers in said link, said optical core radius R1i and said length Li are chosen such that R1i≧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.