Patent ID: 6862391

Claim:
An optical transmission line comprising a single-mode optical fiber having a positive chromatic dispersion in a 1.55-μm wavelength band, and a dispersion-compensating optical fiber for compensating for a chromatic dispersion of said single-mode optical fibers; said optical transmission line having, as characteristics of said optical transmission line as a whole at a wavelength of 1550 nm, a chromatic dispersion with an absolute value of 4 ps/nm/km or less, and a dispersion slope of −0.015 ps/nm 2 /km or more but less than 0 ps/nm 2 /km; wherein said chromatic dispersion has a maximum value within a wavelength range of 1450 to 1530 nm, and a minimum value within a wavelength range of 1570 to 1620 nm.