Patent ID: 7336877

Claim:
An optical waveguide fiber comprising: a central core region 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 region has a maximum relative refractive index percent, Δ 1MAX ; an annular region surrounding and directly adjacent to the central core region and extending to a radius R 2 and having a negative relative refractive index percent profile, Δ 2 (r) in %, with a minimum relative refractive index percent, Δ 2MIN ; and an outer annular cladding surrounding the annular region and having a relative refractive index percent, Δ c (r) in %; wherein Δ 1MAX >0>Δ 2MIN ; wherein the relative refractive index of the optical fiber is selected to provide a bandwidth greater than 5 GHz-km at all wavelengths in a wavelength range having a rangewidth of at least 25 nm, and wherein the wavelength range lies between 775 and 1100 nm.