  We show experimentally and theoretically that localized pulses can be
generated from an electrically biased $200\,\mu$m multi-transverse mode
Vertical-Cavity Surface-Emitting Laser. The device is passively mode-locked
using optical feedback from a distant Resonant Saturable Absorber Mirror and it
is operated below threshold. We observe multistability between the off solution
and a large variety of pulsating solutions with different number and
arrangements of pulses per round-trip, thus indicating that the mode-locked
pulses are localized, i.e. mutually independent. We show that a modulation of
the bias current allows controlling the number of the pulses travelling within
the cavity, thus suggesting that our system can be operated as an arbitrary
pattern generator of 10 ps pulses and 1 W peak power.
