Abstract

We present a method for implementing Boolean logic operations using MQW optical devices and a spatial pattern coding. Serially connected MQW devices such as an S-SEED have some advantages: high speed switching capability, a tolerance to fluctuation of power sources, and logic operation capability. Therefore, if cascadability of logic can be maintained with these devices, we can build high speed optical logic circuits. In this study, we adopted a spatial pattern coding method, which represents logical values (1 or 0) as combinations of bright and dark cells, on both input and output sides as a logic representation to keep cascadability. We show that these devices can work as NOT, NAND, or NOR logic elements. In addition, we investigate a code converter that converts a logic representation in intensity to a spatial pattern coding.

© 1991 Optical Society of America