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A technique for the generation of dark pulse trains from continuous-wave (cw) light is presented. It consists of co-propagating a cw signal with intense pump pulses in an optical fiber where both the signal and the pump experience normal group-velocity dispersion. The pump imposes a positive frequency chirp on the signal through cross-phase modulation while normal dispersion tends to chip out the signal energy in the chirped region, thus leading to the generation of a dark pulse train with a repetition rate identical to that of the pump. A train of 30.3 ps dark pulses has been observed when using 31.7 ps pump pulses from an actively mode-locked fiber ring laser. The experimental results agree well with numerical simulations. © 1999 American Institute of Physics.