The paper describes an injection seeder driver (prototype) for a directly modulated semiconductor laser diode. The
device provides adjustable pulse duration and repetition frequency to shape an output signal. A temperature controller
stabilizes a laser diode spectrum. Additionally, to avoid a back oscillation, redundant power supply holds a generation
until next stages shut down. Low EMI design and ESD protection guarantee stable operation even in a noisy
environment. The controller is connected to the PC via USB and parameters of the pulse are digitally controlled through
a graphical interface. The injection seeder controller can be used with a majority of commercially available laser diodes.
In the experimental setup a telecommunication DFB laser with 4 GHz bandwidth was used. It allows achieving
subnanosecond pulses generated at the repetition rate ranging from 1 kHz to 50 MHz. The developed injection seeder
controller with a proper laser diode can be used in many scientific, industrial and medical applications.