Patent ID: 7099543

Claim:
An optical fiber comprising: a length; a core having a refractive index profile and a centerline; the core refractive index comprising a central segment, a moat segment surrounding the central segment, and a ring segment surrounding the moat segment, the central segment having a greater relative refractive index than the ring segment, the ring segment having a greater relative refractive index than the moat segment, and a cladding layer surrounding and directly adjacent the core; wherein the optical fiber has an attenuation at 1550 nm; wherein the refractive index of the core is selected to provide: an optical effective area at 1550 nm less than 80 μm 2 ; a dispersion at 1550 nm having an absolute magnitude less than 7.5 ps/nm-km; and an absolute SBS threshold in dBm greater than about 9.5+10 log [(1−e −(0.19)(50)/4.343 )/(1−e −(α)(L)/4.343 )], wherein L is the length in km and α is the attenuation in dB/km at 1550 nm.