An optical fiber comprising: a core , said core having an outer radius r 1 between 4 μm and 10 μm and a relative refractive index profile; a cladding surrounding said core, said cladding having an outer radius r 4 that is at least 50 μm, wherein said cladding includes an inner cladding region having an outer radius r 3 and an outer cladding region surrounding said inner cladding region and having an outer radius r 4 , said inner cladding region having a relative refractive index Δ 3 with a minimum value Δ 3MIN , said outer cladding region having a relative refractive index Δ 4 with a minimum value Δ 4MIN > Δ 3MIN , and wherein the fiber has an outer radius r 6 that is 110 μm or less; the fiber further comprising: a primary coating surrounding said cladding, said primary coating having an outer radius r 5 , said primary coating having an in situ modulus of 0.50 MPa or less; and a secondary coating surrounding said primary coating, said secondary coating having the outer radius r 6 , characterized in that : the relative refractive index profile of the core is an alpha profile having an alpha value equal to 2; said secondary coating has an in situ modulus of 1500 MPa or greater; and said fiber has a mode field diameter of 9 μm or greater at 1310 nm and exhibits a bend loss at a wavelength of 1550 nm, when turned about a mandrel having a diameter of 15 mm, of less than 0.5 dB/turn. a core , said core having an outer radius r 1 between 4 μm and 10 μm and a relative refractive index profile; a cladding surrounding said core, said cladding having an outer radius r 4 that is at least 50 μm, wherein said cladding includes an inner cladding region having an outer radius r 3 and an outer cladding region surrounding said inner cladding region and having an outer radius r 4 , said inner cladding region having a relative refractive index Δ 3 with a minimum value Δ 3MIN , said outer cladding region having a relative refractive index Δ 4 with a minimum value Δ 4MIN > Δ 3MIN , and wherein the fiber has an outer radius r 6 that is 110 μm or less; the fiber further comprising: a primary coating surrounding said cladding, said primary coating having an outer radius r 5 , said primary coating having an in situ modulus of 0.50 MPa or less; and a secondary coating surrounding said primary coating, said secondary coating having the outer radius r 6 , characterized in that : the relative refractive index profile of the core is an alpha profile having an alpha value equal to 2; said secondary coating has an in situ modulus of 1500 MPa or greater; and said fiber has a mode field diameter of 9 μm or greater at 1310 nm and exhibits a bend loss at a wavelength of 1550 nm, when turned about a mandrel having a diameter of 15 mm, of less than 0.5 dB/turn. a primary coating surrounding said cladding, said primary coating having an outer radius r 5 , said primary coating having an in situ modulus of 0.50 MPa or less; and a secondary coating surrounding said primary coating, said secondary coating having the outer radius r 6 , characterized in that : the relative refractive index profile of the core is an alpha profile having an alpha value equal to 2; said secondary coating has an in situ modulus of 1500 MPa or greater; and said fiber has a mode field diameter of 9 μm or greater at 1310 nm and exhibits a bend loss at a wavelength of 1550 nm, when turned about a mandrel having a diameter of 15 mm, of less than 0.5 dB/turn. the relative refractive index profile of the core is an alpha profile having an alpha value equal to 2; said secondary coating has an in situ modulus of 1500 MPa or greater; and said fiber has a mode field diameter of 9 μm or greater at 1310 nm and exhibits a bend loss at a wavelength of 1550 nm, when turned about a mandrel having a diameter of 15 mm, of less than 0.5 dB/turn. <EOS>