Patent ID: 7187833

Claim:
An optical waveguide fiber comprising: a central segment extending radially outwardly from a centerline to a radius R 1 and having a positive relative refractive index percent, Δ 1 (r) in %, wherein the central segment has a maximum relative refractive index percent, Δ 1MAX , greater than 0.3%; an annular segment surrounding the central segment and extending to a radius R 3 and having a negative relative refractive index percent, Δ 3 (r) in %, with a minimum relative refractive index percent, Δ 3MIN ; and an outer annular cladding surrounding the annular segment and having a relative refractive index percent, Δ c (r) in %; wherein Δ 1MAX >0>Δ 3MIN ; wherein the relative refractive index of the optical fiber is selected to provide an effective area of greater than about 75 μm 2 and less than 100 μm 2 at a wavelength of about 1550 nm, a dispersion slope of less than 0.07 ps/nm 2/ km at a wavelength of about 1550 nm, a zero-dispersion wavelength of less than 1350 nm, and an attenuation of less than 0.20 dB/km at a wavelength of about 1550 nm.