Patent ID: 7903917

Claim:
An optical fiber comprising: a glass core extending from a centerline to a radius R 1 ; a glass cladding surrounding and in contact with the core, the cladding comprising: an annular inner region extending from R 1 to a radius R 2 , the inner region comprising a radial width, W 2 =R 2 −R 1 , an annular ring region extending from R 2 to a radius R 3 , the ring region comprising a radial width, W 3 =R 3 −R 2 , and an annular outer region extending from R 3 to an outermost glass radius R 4 ; wherein the core comprises a maximum relative refractive index, Δ 1MAX , relative to the outer region, and Δ 1MAX <0.45%; wherein the annular inner region comprises a radial width, W 2 , a minimum relative refractive index, Δ 2MIN , relative to the outer region, and a maximum relative refractive index, Δ 2MAX , relative to the outer region, wherein W 2 >2 μm; wherein the annular ring region comprises: a minimum relative refractive index, Δ 3MIN , relative to the annular outer region, wherein Δ 3MIN ≦−0.1%; wherein ΔA 1MAX >Δ 2MAX >Δ 3MIN , and Δ 1MAX >Δ 2MIN >Δ 3MIN ; wherein R 1 /R 2 >0.40; and wherein the core and the cladding provide a cable cutoff less than 1260 nm, a zero dispersion between 1300 and 1324 nm, and a 10 mm diameter mandrel bend loss of less than 1.0 dB/turn.