Patent ID: 6980723

Claim:
A dispersion-compensating optical fiber that compensates chromatic dispersion of a 1.3 μm single-mode optical fiber over the entire wavelength range of 1.53-1.63 μm wherein, chromatic dispersion at a wavelength of 1.55 μm is −50 ps/nm/km or less, the dispersion slope is negative over the entire wavelength range of 1.53-1.63 μm, a cutoff wavelength is provided at which there is substantially single-mode propagation over the entire wavelength range of 1.53-1.63 μm, bending loss is 30 dB/m or less over the entire wavelength range of 1.53-1.63 μm, effective area is 20 μm 2 or more over the entire wavelength range of 1.53-1.63 μm, and the absolute value of chromatic dispersion during compensation of the chromatic dispersion of a 1.3 μm single-mode optical fiber serving as the target of compensation is 0.5 ps/nm/km or less over the entire wavelength range of 1.53-1.63 μm.