Optical fiber and optical transmission line

An optical fiber cable comprising an optical fiber that has a zero dispersion wavelength in a wavelength range of 1350 to 1410 nanometers;

• a dispersion of 2 to 8 ps/nm/km at a wavelength of 1550 nanometers;
• a dispersion slope of a positive value and not more than 0.05 ps/nm2/km at a wavelength of 1550 nanometers;
• a transmission loss of not more than 0.4 dB/km at a wavelength of 1380 nanometers;
• an increase of transmission loss of not more than 0.04 dB/km at a wavelength of 1380 nanometers after a hydrogen aging test;
• a transmission loss of not more than 0.25 dB/km at a wavelength of 1550 nanometers;
• and
• a bending loss of not more than 30 dB/m when the optical fiber is wound at a a diameter of 20 millimeters at a wavelength of 1550 nanometers.

An optical transmission line for a Raman amplification system, comprising an optical fiber cable that includes an optical fiber, wherein

• the optical fiber has
• a zero dispersion wavelength in a wavelength range of 1350 to 1410 nanometers;
• a dispersion of 2 to 8 ps/nm/km at a wavelength of 1550 nanometers;
• a dispersion slope of a positive value and not more than 0.05 ps/nm2/km at a wavelength of 1550 nanometers;
• a transmission loss of not more than 0.4 dB/km at a wavelength of 1380 nanometers;
• an increase of transmission loss of not more than 0.04 dB/km at a wavelength of 1380 nanometers after a hydrogen aging test;
• a transmission loss of not more than 0.25 dB/km at a wavelength of 1550 nanometers;
• and
• a bending loss of not more than 30 dB/m when the optical fiber is wound at a diameter of 20 millimeters at a wavelength of 1550 nanometers.

An optical transmission line for a Raman amplification system, comprising an optical fiber that has

• a zero dispersion wavelength in a wavelength range of 1350 to 1410 nanometers;
• a dispersion of 2 to 8 ps/nm/km at a wavelength of 1550 nanometers;
• a dispersion slope of a positive value and not more than 0.05 ps/nm2/km at a wavelength of 1550 nanometers;
• a transmission loss of not more than 0.4 dB/km at a wavelength of 1380 nanometers;
• an increase of transmission loss of not more than 0.04 dB/km at a wavelength of 1380 nanometers after a hydrogen aging test;
• a transmission loss of not more than 0.25 dB/km at a wavelength of 1550 nanometers;
• and
• a bending loss of not more than 30 dB/m when the optical fiber is wound at a diameter of 20 millimeters at a wavelength of 1550 nanometers.