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Abstract

A few mode optical fiber that includes an optical core and an optical cladding surrounding the optical core. The FMF has a step-index profile. The optical core has a core outer radius R₁≥7.5 μm and a core refractive index difference Δn₁ such that 14.5×10⁻³<Δn₁<24×10⁻³. The optical cladding comprises:

an index ring with: a ring inner radius Rr1 between 12 μm and 19 μm;a ring refractive index difference Δnr such that Δn1/Δnr is between 2 and 4;a ring volume Vring=πΔnr(Rr22−Rr12) between 1.8 μm2 and 4.1 μm2 where Rr2 is the ring outer radius; an inner cladding between the optical core and the index ring, with an inner cladding inner radius Ri1 and an inner cladding outer radius Ri2, the inner cladding having an inner cladding refractive index difference Δnclad1 between −1.0×10−3 and 1.0×10−3.

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First Claim