Patent ID: 6904217

Claim:
An optical fiber comprising sequential regions of: a. a core region extending from the center of the optical fiber, with essentially all of the core region having a positive Δ, b. a trench region, with essentially all of the trench region having a negative Δ, c. a ring region having a positive Δ, the optical fiber characterized by: 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.