  We theoretically demonstrate the generation of dark solitons trains in a
one-dimensional exciton- polariton condensate within an experimentally trivial
scheme. In particular we show that the fre- quency of the train can be finely
tuned either electrically of fully optically to provide a stable and efficient
output signal modulation. Taking the polarization degree of freedom into
account we elucidate the possibility to additionally form on-demand
half-solitons trains.
