Patent ID: 6925237

Claim:
A dispersion compensating optical fiber, comprising: a refractive index profile having a central core segment with a positive relative refractive index (Δ 1 ) and a core outer radius (r 1 ), a moat segment surrounding the central core segment having negative relative refractive index (Δ 2 ) and an moat outer radius (r 2 ), and a ring segment surrounding the moat segment having a positive relative refractive index (Δ 3 ), a ring center radius (r 3 ) to a center of the ring segment, a ring width (W r ) measured at half the height of the relative refractive index of the moat segment (Δ 3 ) wherein the ring segment is offset from the moat outer radius (r 2 ) by a ring offset (X o ) greater than 0.4 μm, wherein X o =r 3 −r 2 −Wr /2, and the refractive index profile results in dispersion slope of less than −0.36 and greater than −0.56 ps/nm 2 /km at 1550 nm; and total dispersion of less than −120 ps/nm/km and greater than −145 ps/nm/km at 1550 nm.