  We demonstrate a technique for shaping current inputs for the direct
modulation of a semiconductor laser for digital communication. The introduction
of shaped current inputs allows for the suppression of relaxation oscillations
and the avoidance of dynamical memory in the physical laser device, i.e., the
output will not be influenced by previously communicated information. On the
example of time-optimized bits, the possible performance enhancement for high
data rate communications is shown numerically.
