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Abstract

An optical fiber comprising: (i) a chlorine doped silica based core comprising a core alpha (α)>10, and maximum refractive index delta Δ_1max % and Cl concentration >1 wt %; (ii) a cladding surrounding the core, the cladding comprising: (a) an inner cladding region adjacent to and in contact with the core and having a refractive index delta Δ₂ and a minimum refractive index delta Δ_2min such that Δ_2min<Δ_1max, the inner cladding region comprising fluorine doped silica and the refractive index delta Δ₂ with region that decreases with radial position, and (b) an outer cladding region surrounding the inner cladding region and having refractive index delta Δ₃, such that Δ_2min<Δ₃. The fiber has mode field diameter MFD at 1310 nm of ≥9 microns, a cable cutoff of ≤1260 nm, zero dispersion wavelength of 1300 nm≤zero dispersion wavelength ≤1324 nm and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn.

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First Claim