LARGE EFFECTIVE AREA FIBER WITH GE-FREE CORE

According to some embodiments an optical waveguide fiber comprises: (i) a Ge free core having an effective area of 90 μm2 to 160 μm2, at a 1550 nm wavelength, and α value 12 α 25, said core comprising: (a) a central core region extending radially outwardly from a centerline to a radius 0 μm r0 2 μm, and having a relative refractive index percent profile 0(r) in % measured relative to pure silica, wherein −0.1% 0(r) 0.1%, wherein the central core region has a maximum relative refractive index percent, 0MAX; (b) a first annular core region surrounding and directly adjacent to the central core region and extending to an outer radius r1, wherein 4.8 μm r1 10 μm, and having a relative refractive index percent profile, 1(r) in % measured relative to pure silica, and a minimum relative refractive index, 2MIN, and the relative refractive index measured at a radius r=2.5 μm being: −0.15 1(r=2.5 μm) 0, and 0MAX 1(r=2.5 μm); (c) a fluorine doped second annular region surrounding and directly adjacent to the first annular core region and extending to a radius 13 μm r2 30 μm and having a negative relative refractive index percent profile, 2(r) in %, measured relative to pure silica, with a minimum relative refractive index percent 2MIN being: 2MIN 1(r=2.5 μm), and −0.7% 2MIN −0.28%; (ii) a cladding surrounding the core and having a relative refractive index percent c(r) in % measured relative to pure silica, and c(r)= 2MIN±0.3%; wherein the relative refractive index profile of the optical fiber is selected to provide attenuation of no more than 0.175 dB/km at the wavelength of 1550 nm.