Patent ID: 6907172

Claim:
An optical transmission line comprising a first optical fiber and a second optical fiber which are connected together, said first optical fiber having an effective area not less than 80 μm 2 at a wavelength of 1550 nm, said second optical fiber having at least one positive dispersion region and at least one negative dispersion region, wherein said at least one positive dispersion region has a positive chromatic dispersion and said at least one negative dispersion region has a negative chromatic dispersion, respectively at a predetermined wavelength in a signal wavelength band, and the absolute value of the chromatic dispersion in said at least one positive dispersion region or at least said one negative dispersion region is not less than 5 ps/nm/km at said predetermined wavelength, and wherein the length of said at least one positive dispersion region or said at least one negative dispersion region is not more than 5 km.