There is disclosed a dispersion-compensating optical fiber exhibiting, at a
wavelength of 1500 nm, a chromatic dispersion of -30 ps/nm/km or less, a ratio
(S/D) of -0.08/nm to +0.05/nm between chromatic dispersion D and dispersion slope
S, a polarization mode dispersion of 0.3 ps/km1/2 or less, and a transmission
loss of 1 dB/km or less, and an excess loss of 0.2 dB/km or less due to OH group
in a wavelength band of 1.4 m.
