Design and simulation of an all-optical Fredkin gate based on silicon slab-waveguide in a 2-D photonic crystal.

In this paper, we simulated and designed an all-optical Fredkin gate. The proposed structure is very simple and compact. We used air holes with radii of 177 nm in a silicon slab waveguide in a square lattice with a lattice constant of a = 466 nm. First, we created input and output waveguides in the structure. After that, by imposing a non-linear ring resonator, we controlled the coupling of light. This ring is composed of doped glass with linear and non-linear refractive indices of 1.4 and 10–14 m2/w respectively. The results of the time analysis showed that the worst rising time of the proposed gate is 0.61 ps and hence is very fast. We set the parameters of the lattice in a way that the proposed device works on λ = 1550 nm. All of the mentioned features make this gate suitable for all-optical integrated circuits. [ABSTRACT FROM AUTHOR]