The design of universal logic gates using microring resonator structures

Abstract

This paper focuses on design of specific type of optical logic gates - universal gates (NAND and NOR). These gates are based on microring resonators (MRR) coupled both in series (for NAND gate) and in parallel (in case of NOR gate). Because of their simplicity in terms of fabrication, the MRRs are modulated through thermo-optic effect of silicon. The MRRs in the proposed devices act as input ports combined with a constant source of light at specific wavelengths. Thus, through different coupling configurations of the rings, the logic is obtained. Due to the architectural features of the devices, complements of these gates (AND, OR) can be obtained as well. Consequently, the proposed designs exhibit the behavior of universal gates and their complements simultaneously. In addition, using Optical Spectrum Analyzer (OSA) as well as Optical Oscilloscope, static and corresponding dynamic responses are illustrated. Furthermore, complementary parameters such as extinction ratio and speed are evaluated.