Dispersion compensating optical fiber and optical transmission line

摘要

The present invention relates to an optical transmission line suitably used for a large-capacity high-speed WDM optical transmission system, and an optical fiber suitably used for such an optical transmission line. The dispersion compensating optical fiber has a minimum wavelength at which an increase amount of an actual loss value with respect to a theoretical loss value is not less than 10 mdB/km in a use wavelength band and on a long wavelength side of the use wavelength band. The actual loss value is measured in a state that the fiber is looped around a bobbin, and the minimum wavelength falls within a range of 1,565 to 1,700 nm.