Patent ID: 6873776

Claim:
A dispersion and dispersion slope compensating optical waveguide fiber comprising: a core region surrounded by and in contact with a clad layer, said core region including three segments, a central segment and a first and a second annular segment surrounding said central segment, each said segment having respective radii, r i , relative refractive index percents, Δ i %, where i takes on values 1, 2, and 3 beginning with 1 for the central segment, and refractive index profiles; wherein, Δ 1 % is greater than 1.4%, r 1 is less than 3 μm; Δ 2 % is more negative than −0.3%, r 2 is greater than 6 μm; Δ 3 % is greater than 0.15%, r 3 is greater than 9 μm; Δ 1 % is greater than Δ 3 %, r 3 is greater than r 2 ; and, the combination of Δ i %'s and r i 's is selected to provide a negative total dispersion slope more negative than −1.5 ps/nm 2 -km at 1550 nm and a ratio of total dispersion to total dispersion slope in the range of 40 nm to 60 nm at a wavelength of 1550 nm.