Optical fiber having a lower bending loss

An optical fiber ribbon comprising a plurality of optical fibers arranged in a parallel array,

• wherein each of said optical fibers has a core region disposed at a center of said optical fiber and a cladding surrounding around an outer periphery of said core region,
• said core region having a maximum relative refractive index difference of larger than 0.36% and a minimum relative refractive index difference of larger than −0.05% with respect to said cladding,
• said optical fiber having:
• a mode field diameter of 8 to 10 μm at a wavelength of 1310 nm;
• an effective area of 70 to 90 μm2 at a wavelength of 1550 nm;
• a zero-dispersion wavelength in the wavelength range of 1285 to 1330 nm;
• a fiber cut-off wavelength (λc) by a 2-meter measurement of more than 1350 nm;
• a cable cut-off wavelength (λcc) by a 22-meter measurement of less than 1285 nm;
• a chromatic dispersion at a wavelength of 1550 nm of not more than 20 ps/nm/km;
• a bending loss at a wavelength of 1625 nm of not more than 10 dB/m when wound at a radius of 10 mm;
• a transmission loss in a wavelength range of 1285 to 1625 nm of not more than 0.40 dB/km;
• a transmission loss at a wavelength of 1383 nm less than a transmission loss at a wavelength of 1310 nm;
• and
• a difference in the transmission loss at a wavelength of 1383 nm of not more than 0.04 dB/km between before and after exposure to hydrogen.

An optical fiber cable comprising:

• a cylindrical rod including at least one slot accommodating therein a plurality of optical fiber ribbons;
• and
• a sheath covering said cylindrical rod,
• wherein each of said optical fiber ribbons has a plurality of optical fibers arranged in a parallel array, and
• each of said optical fibers has a core region disposed at a center of said optical fiber and a cladding surrounding around an outer periphery of said core region,
• said core region having a maximum relative refractive index difference of larger than 0.36% and a minimum relative refractive index difference of larger than −0.05% with respect to said cladding,
• said optical fiber having:
• a mode field diameter of 8 to 10 μm at a wavelength of 1310 nm;
• an effective area of 70 to 90 μm2 at a wavelength of 1550 nm;
• a zero-dispersion wavelength in the wavelength range of 1285 to 1330 nm;
• a fiber cut-off wavelength (λc) by a 2-meter measurement of more than 1350 nm;
• a cable cut-off wavelength (λcc) by a 22-meter measurement of less than 1285 nm;
• a chromatic dispersion at a wavelength of 1550 nm of not more than 20 ps/nm/km;
• a bending loss at a wavelength of 1625 nm of not more than 10 dB/m when wound at a radius of 10 mm;
• a transmission loss in a wavelength range of 1285 to 1625 nm of not more than 0.40 dB/km;
• a transmission loss at a wavelength of 1383 nm less than a transmission loss at a wavelength of 1310 nm;
• and
• a difference in the transmission loss at a wavelength of 1383 nm of not more than 0.04 dB/km between before and after exposure to hydrogen.