The fiber is adapted to compensate chromatic dispersion and chromatic
dispersion slope of a positive chromatic dispersion optical fiber in the U
band from 1625 nm to 1675 nm. In that band it has negative chromatic
dispersion, negative chromatic dispersion slope, and a chromatic
dispersion over chromatic dispersion slope ratio from 100 nm to 600 nm. At
a wavelength of 1650 nm it has bending losses less than 100 dB/m with the
fiber wound around a 10 mm radius former and bending losses less than
5.times.10.sup.-3 dB with 100 turns of the fiber wound around a 30 mm
radius former. The dispersion compensating fiber can be used to produce
broadband transmission systems for signals with wavelengths up to 1675 nm.
