Nowadays, the development of optical telecommunication systems requires more efficient all-optical elements appreciation to their high data transmission speeds and reduced electromagnetic interferences. In this work, our objective is to attest by simulation a design of an optical switch using 2D photonic crystals from polystyrene, an organic polymeric material with high Kerr non-linearity. This excellent ultra-fast switching leads us to the exploited in the construction of two new structures of all-optical AND/NAND and OR/NOR logic gates. These structures based on non-linear ring resonator NRR of different radius in order to operate a telecom wavelength of 1550.3 µm using RSoft (Full-Wave) software. The average contrast intensity is between 15.52 and 23.42 dB and low delay time varied from 20 fs to 5.0 ps. Hence, resulting a very high output signal for ON-switching (82–130% of P
in) and a weak signal for OFF-switching (0.2–7% of P
in) through a minimum threshold power around of 1.2 mW/μm2.
The all-optical logic gates have become an important key enabling in optical integrated circuits and find applications in optical networks. In this paper, we introduce new complete series of optical logic gates using photonic crystals. These designs formed by compilation with interference based defect and resonance phenomenon. The proposed work based on two dimensional square lattices by putting gallium arsenide (GaAs) rods immersed on air background. The maximum contrast ratio and the maximum working bit rates is obtained for the NOT/XOR and OR logic gates equal to 50.81 dB and 12.5 Tb/s, respectively. The simulation and optimization of structure is approved out using Finite-Difference-Time-Domain (FDTD) method and Plane Wave’s Method (PWEM).
Nowadays, miniaturized optical integrated circuits make a great evolution in optical microelectronics technology. In data processing chains, the need for an ultra-fast all-optical encoder is necessary for a large data transfer. In this work, we have proposed an all-optical encoder structure based on nonlinear 2D photonic crystals with Kerr effect exploiting a nonlinear polymer material of high third-order optical susceptibility. In addition, to generate the telecommunication domain wavelength at 1.55µm, an optimization of the optical-geometry parameters has been realized. Simulations will be performed using plane wave expansion and finite difference time domain methods. The nonlinear effect allows an excellent average contrast ratio of 39.76 db, as the structure requires a very low threshold intensity estimated at 1.5 mW/µm2. The significant power transmitted to the output is equal to 99% and 0.03% of input power equivalent to logic state “1” and logic state “0” respectively. The proposed structure generates a bit rate of 1.92Tb/s, therefore able to adapt with other ultrafast all-optical circuits.
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