A single mode optical fiber including a germania doped silica central core region having outer radius r1 and refractive index Δ1, a maximum refractive index Δ1max, and 0.32%≤Δ1max≤0.45%, and a core alpha profile (Coreα). In various embodiments, the optical fiber also contains a cladding region including: (i) a second inner cladding region or ring region surrounding the first inner cladding region; or (ii) an inner cladding region or pedestal region surrounding the germania doped silica central core region. The corresponding resultant optical fibers exhibit a 22 m cable cutoff less than or equal to 1260 nm, a macrobending loss at 1550 nm of ≤0.75 dB/turn on a 20 mm diameter mandrel, a zero dispersion wavelength, λ0, of 1300 nm≤λ0≤1324 nm, and a mode field diameter at 1310 nm of 8.2 microns≤MDF1310 nm≤9.6 microns.