Low bend loss optical fiber with graded index core

A single mode optical fiber, comprising:

• a silica based core having a graded refractive index profile with an alpha of less than 5, a relative refractive index Δ1max, and an outer radius r1, wherein 10 microns>r1≥6.5 microns, the core further comprising Cl, Ge, or a combination thereof;
• a first cladding region in contact with and surrounding the core, the first cladding region having a relative refractive index Δ2min, an inner radius r1, and an outer radius r2, wherein r2<20 microns;
• and
• an outer cladding region surrounding the first cladding region, the outer cladding region having a relative refractive index Δ3,
• said fiber having MFD at 1310 nm wavelength greater than 9 microns, a zero dispersion wavelength of less than 1306 nm, a 22 m cable cutoff wavelength of less than 1260 nm;
• and a bend loss of
• less than 0.005 dB/turn when the optical fiber is bent around a 30 mm diameter mandrel;
• less than <0.5 dB/turn when the fiber is bent around a 20 mm diameter mandrel.