Weakly-coupled few mode optical fibers for mode division multiplexing and corresponding optical transmission system
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United States of America Patent
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Jan 5, 2021
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Oct 3, 2019
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Oct 8, 2018
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Abstract
A few-mode optical fiber including 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.
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