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Abstract

An optical fiber having an optical core and an optical cladding surrounding the optical core, the optical core having a single α graded-index profile with α≥1, α being a non-dimensional parameter that defines the index profile shape of the optical core, and the optical core having a maximal refractive index n_co at its center; the optical cladding has at its outer edge a refractive index n_Cl, and comprises a region of depressed refractive index n_trench, called a trench, with a negative refractive index difference Δn_t=n_trench−n_Cl with respect to said optical cladding, the trench having an outer radius R_trench. The optical core and cladding are configured to support propagation of at least six spatial modes and at maximum fifty-five spatial modes at an operating wavelength λ_op between, and including, 1460 nm and 1675 nm, and the optical core satisfies an ovality criterion between 0.05 and 0.3, when said ovality criterion is measured at a circumference of equal index n_eq within said core, such that Δn_eq−n_eq−n_Cl is less than 75% of Δn_co=n_co−n_Cl, said ovality criterion o being defined by the following equation:

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First Claim