An optical fiber comprising: a core , said core having an outer radius r 1 ; a cladding surrounding said core , said cladding having an outer radius r 4 ; a primary coating surrounding said cladding , said primary coating having an outer radius r 5 ; a secondary coating , surrounding said primary coating , said secondary coating having an outer radius r 6 ; wherein said fiber has a mode field diameter MFD greater than 8.2 microns at 1310 nm, a fiber cutoff wavelength of less than 1310 nm, and said fiber exhibits a bend loss when wrapped around a mandrel having a diameter of 10 mm, of less than 1.0 dB/turn at a wavelength of 1550 nm; wherein r 4 is less than 45 microns; the primary coating has a thickness t P > 8 microns, an in situ modulus E P , wherein E P is 0.35 MPa or less, and a spring constant χ P <1.6 MPa, where χ P = 2E P r 4 / t P ; and the secondary coating has a thickness t S =r 6 - r 5 , and an in situ modulus Es of 1200 MPa or greater; wherein ts is greater than 10 microns and said outer radius r 6 is 85 microns or less; and wherein said cladding includes a first inner cladding region having an outer radius r 2 and a relative refractive index Δ 2 , and a second inner cladding region surrounding said first inner cladding region and having an outer radius r 3 , said second inner cladding region having a relative refractive index Δ 3 with a minimum value Δ 3MIN , wherein Δ 3MIN < -0.2%. a core , said core having an outer radius r 1 ; a cladding surrounding said core , said cladding having an outer radius r 4 ; a primary coating surrounding said cladding , said primary coating having an outer radius r 5 ; a secondary coating , surrounding said primary coating , said secondary coating having an outer radius r 6 ; wherein said fiber has a mode field diameter MFD greater than 8.2 microns at 1310 nm, a fiber cutoff wavelength of less than 1310 nm, and said fiber exhibits a bend loss when wrapped around a mandrel having a diameter of 10 mm, of less than 1.0 dB/turn at a wavelength of 1550 nm; wherein r 4 is less than 45 microns; the primary coating has a thickness t P > 8 microns, an in situ modulus E P , wherein E P is 0.35 MPa or less, and a spring constant χ P <1.6 MPa, where χ P = 2E P r 4 / t P ; and the secondary coating has a thickness t S =r 6 - r 5 , and an in situ modulus Es of 1200 MPa or greater; wherein ts is greater than 10 microns and said outer radius r 6 is 85 microns or less; and wherein said cladding includes a first inner cladding region having an outer radius r 2 and a relative refractive index Δ 2 , and a second inner cladding region surrounding said first inner cladding region and having an outer radius r 3 , said second inner cladding region having a relative refractive index Δ 3 with a minimum value Δ 3MIN , wherein Δ 3MIN < -0.2%. the secondary coating has a thickness t S =r 6 - r 5 , and an in situ modulus Es of 1200 MPa or greater; wherein ts is greater than 10 microns and said outer radius r 6 is 85 microns or less; and wherein said cladding includes a first inner cladding region having an outer radius r 2 and a relative refractive index Δ 2 , and a second inner cladding region surrounding said first inner cladding region and having an outer radius r 3 , said second inner cladding region having a relative refractive index Δ 3 with a minimum value Δ 3MIN , wherein Δ 3MIN < -0.2%. <EOS>