Optical communication link circuit

An optical communication link, an optical transmission line comprising a positive dispersion fiber and the negative dispersion optical fiber having a negative dispersion value having a positive configuration of discrete values, in a wavelength region to be used in: a discrete value of the positive dispersion fiber 5ps / / km nm or more and 15ps / nm / km or less; and DPS value of the positive dispersion fibers and negative dispersion fiber are 250nm or more, DPS discrete value is divided by the gradient of the wavelength dispersion value of the individual fibers of 1550nm the drawn.