  We report the experimental observation of multiple dispersive waves emitted
in the anomalous dispersion region of an optical fiber from a train of dark
solitons. Each individual dispersive wave can be associated to one particular
dark soliton of the train, using phase-matching arguments involving
higher-order dispersion and soliton velocity. For a large number of dark
solitons (>10), we observe the formation of a continuum associated with the
efficient emission of dispersive waves.
