Patent ID: 6987918

Claim:
A dispersion compensation fiber, comprising: a refractive index profile including a central core having a positive core delta (Δ 1 ) and an outer radius (R 1 ), a moat surrounding the central core having a negative moat delta (Δ 2 ) and a moat outer radius (R 2 ), and a ring surrounding the moat having a positive ring delta (Δ 3 ), wherein the refractive index profile is selected to provide total dispersion less than −80 ps/nm/km at 1550 nm and less than −90 ps/nm/km at 1600 nm, dispersion slope less than −0.18 ps/nm 2 /km at 1550 nm and less than −0.1 ps/nm 2 /km at 1600 nm, and kappa, defined as the total dispersion divided by the dispersion slope at a specific wavelength, at 1550 nm being greater than 250 nm and less than 450 nm, and at 1600 nm being greater than the kappa at 1550 nm, and kappa ratio, defined as kappa at 1600 nm divided by kappa at 1550 nm, greater than 1.35.