Patent ID: 7406237

Claim:
An optical waveguide fiber comprising: a core comprising a central core segment extending radially outwardly from a centerline to a radius R 1 and having a positive relative refractive index percent profile, Δ 1 (r) in %, wherein the central core segment comprises a maximum relative refractive index percent, Δ MAX ; and an outer annular cladding surrounding the core and comprising a relative refractive index percent, Δ c (r) in %; wherein Δ MAX >0; wherein the relative refractive index of the optical fiber provides an LP02 cable cutoff less than 850 nm and an LP21 cable cutoff less than 850 nm; wherein the relative refractive index of the optical fiber provides a bandwidth greater than 10 GHz-km at all wavelengths in a wavelength range having a rangewidth of at least 10 nm; and wherein the wavelength range lies between 830 and 870 nm.