Optoelectronic thyristor-based photonic smart comparator for analog-to-digital conversion

A new photonic comparator approach to optoelectronic A/D conversion is demo nstrated using an optoelectronic thyristor, The comparator has both digital optical output (since the thyristor itself is a laser in the "on" state) a nd electrical output that is analog or digital. The electrical output subtr acts from the input and passes the result to the comparator input of the ne xt lower order bit. High-speed operation is expected due to the elimination of stored charge in the thyristor structure. The thyristor characteristics are measured and the predicted comparator operation is verified using disc rete devices at low frequencies.