Optoelectronic multiple-valued logic implementation

Programmable optical threshold logic implementation with an optoelectronic circuit

We demonstrate optical binary threshold logic by using an optoelectronic circuit. This threshold gate is in itself a logical complete set owing to the availability of both positive and negative weights and threshold. Furthermore, the weights and the threshold are optically addressed, thereby providing real-time operation. Experimental results demonstrate AND, OR, and MAJORITY functions and three other arbitrary logic functions for three input signals with a single gate. Applications in neural computing and two-dimensional parallel logic processing are discussed.

Switching types and all-optical flip-flop operations in a ring cavity with four nonlinear elements

We consider an optical ring cavity with four nonlinear elements and investigate its all-optical flip-flop operation and the types of switching between its multiple stable states. All-optical flip-flop operation is shown to exist, and the possible switching modes are determined. We also discuss the difference between the slowly varying input and pulse-injection processes. Moreover a procedure to obtain the preinjection states that are needed for operation is proposed.