Patent ID: 7876990

Claim:
An optical waveguide fiber comprising: a core and a cladding, the core having a relative refractive index profile Δ(r) expressed in units of %, said core comprising an alpha profile having an initial point r i and a final point r f , wherein alpha (α) is greater than 2.5 and less than 3.0, a maximum relative refractive index Δ 1MAX , and an outer radius R 1 ; and the core and the cladding provide a fiber with an attenuation of less than 0.331 dB/km at a wavelength of 1310 nm, an attenuation of less than 0.328 dB/km at a wavelength of 1383 nm, an attenuation of less than 0.270 dB/km at a wavelength of 1410 nm, and an attenuation of less than 0.190 dB/km at a wavelength of 1550 nm.