Patent ID: 6952517

Claim:
Method for the manufacture of optical fiber comprising: (a) preparing an optical fiber preform, (b) heating the preform to the softening temperature, and (c) drawing an optical fiber from the preform, the invention characterized in that the optical fiber comprises seguential regions of: (i) a core region extending from the center of the optical fiber, with essentially all of the core region having a positive Δ, (ii) a trench region, with essentially all of the trench region having a negative Δ, (iii) a ring region having a positive Δ, the optical fiber having the following properties: Dispersion at 1550 nm: 5-8.5 ps/nm-km Dispersion slope at 1550 nm: <0.045 ps/nm 2 -km Effective area at 1550 nm: >50 μm 2 Cable cutoff wavelength: <1410 nm Macrobend loss (32 mm) at 1625 nm: <5×10 3 db/km Zero dispersion wavelength: <1400 nm.