An optical fiber (10, 60) comprising: a core (20, 70), said core (20, 70) having an outer radius r 1; a cladding (30, 80) surrounding said core (20, 70), said cladding (30, 80) having an outer radius r 4; a primary coating (40, 90) surrounding said cladding (30, 80), said primary coating (40, 90) having an outer radius r 5; a secondary coating (50, 100), surrounding said primary coating (40, 90), said secondary coating (50, 100) having an outer radius r 6; wherein said fiber (10, 60) 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 (10, 60) 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 (40, 90) 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 (50, 100) 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 (30, 80) 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 (20, 70), said core (20, 70) having an outer radius r 1; a cladding (30, 80) surrounding said core (20, 70), said cladding (30, 80) having an outer radius r 4; a primary coating (40, 90) surrounding said cladding (30, 80), said primary coating (40, 90) having an outer radius r 5; a secondary coating (50, 100), surrounding said primary coating (40, 90), said secondary coating (50, 100) having an outer radius r 6; wherein said fiber (10, 60) 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 (10, 60) 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 (40, 90) 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 (50, 100) 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 (30, 80) 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 (50, 100) 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 (30, 80) 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%.