All-Optical D-Flip Flop with Multi-Wavelength Operation Based on Photonic Crystal

In this paper a new structure for D-flip flop based on photonic crystal is simulated and evaluated. Its operation depends on the optical interference effect. It is arranged on a two-dimension linear-square lattice format with one ring resonator. The enhancement process is applied to decrease the reflection to the input ports and to achieve the best contrast ratio together with high bit rate and multi-wavelength operation. This occurs by inserting three scattering rods and sensitive selection for the inner rods radius of the ring resonator. The results provide that the operating wavelength, the contrast ratio, and the response time are 1.552 μm, 6.91 dB, and 0.21 ps, respectively. The structure simplicity, the absence of external phase shifters, and the compactness are considered magnificent evaluating factors for the proposed design. Therefore, it will be suitable in integration with other optical components to provide remarkable performance in the upcoming computing systems.