  An all optical set-reset flip flop is presented that is based on two coupled
identical laser diodes. The lasers are coupled so that when one of the lasers
lases it quenches lasing in the other laser. The state of the flip flop is
determined by which laser is currently lasing. Rate equations are used to model
the flip flop and obtain steady state characteristics. The flip flop is
experimentally demonstrated by use of antireflection coated laser diodes and
free space optics.
