Patent ID: 7046891

Claim:
An optical waveguide fiber comprising: a central region extending radially outward from the centerline to a radius R 1 and having a positive relative refractive index percent, Δ 1 % (r) with a maximum relative refractive index percent, Δ 1MAX ; an annular ring region surrounding the central region and extending to a radius R 3 and having a positive relative refractive index percent, Δ 3 % (r) with a maximum relative refractive index percent, Δ 3MAX ; and an outer annular cladding region surrounding the annular ring region and having a relative refractive index percent, Δ c % (r); wherein Δ 1MAX >Δ 3MAX >0; wherein the relative refractive index of the optical fiber is selected to provide an inner profile volume greater than 2%-μm 2 , an outer profile volume no greater than 7.5%-μm 2 , an effective area of greater than about 60 μm 2 at 1550 nm, an attenuation at 1550 nm of less than 0.21 dB/km, a positive dispersion at 1550 nm, a zero-dispersion wavelength of less than about 1500 nm, and a cabled cutoff less than 1250 nm.