Ultra-fast all-optical full-adder based on nonlinear photonic crystal resonant cavities

• Published in: Photonic network communications Vol. 41; no. 1; pp. 93 - 101
• Main Authors: Maleki, M. J., Mir, A., Soroosh, M.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2021; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Computer Communication Networks; Computer Science; Delay time; Electrical Engineering; Electrons; Original Paper; Photonic crystals; Ports; Power splitters; Waveguides; Kerr effect; Photonic bandgap; Full-adder; Photonic crystal; Resonant cavity
• ISSN: 1387-974X; 1572-8188
• DOI: 10.1007/s11107-020-00917-5

In this paper, a new photonic crystal-based full-adder for the summation of three bits has been proposed. For realizing this device, three input waveguides are connected to the main waveguide. An optical power splitter is placed at the end of this waveguide. Concerning the amount of optical intensity inside this waveguide, two nonlinear resonant cavities transmit the waves toward the correct ports. When the cavities do not drop the optical waves, the splitter guides them toward the output ports. The maximum delay time of the presented structure is around 0.5 ps and shows the fastest response among the reported works. This improvement is obtained due to using the resonant cavities. The time analysis results in a maximum working frequency of 2 THz. Also, designing the structure in 93 µm 2 demonstrates that it is more compact than the previous works. The normalized low and high margins are obtained around 10% and 85%, respectively. So, the proposed device is capable of considering optical processing circuits.