Amin Ghadi

Bio: Amin Ghadi is an academic researcher from University of Mazandaran. The author has contributed to research in topics: Kerr effect & Two-photon absorption. The author has an hindex of 5, co-authored 21 publications receiving 63 citations.

All-Optical Multiple Logic Gates Based on Spatial Optical Soliton Interactions

Abstract: In this letter, all-optical logic gates with attraction and repulsive interactions of coherent spatial optical solitons have been designed in a bulky nonlinear Kerr medium. The logic gates comprise logical AND and OR gates by the attraction of two obliquely propagating inphase spatial optical solitons and logical NOR and XNOR gates based on repulsive interaction among three out of phase spatial optical solitons. The numerical results show that soliton interactions perform a high contrast power level between ON/OFF states. The proposed model is applicable to design phase-modulated logical gates too. The simplicity and ease for fabrication of the proposed logic gates would be a potential key component for the future of all-optical logical photonic devices and computational photonic circuits.

Nonlinear control of logic structure of all-optical logic devices using soliton interactions

Abstract: The all-optical logic device is the key component in the all-optical communication system and all-optical computing. The research based on the all-optical logic device is important to improve the communication efficiency. In this paper, using optical solitons, all-optical logic devices are investigated theoretically. Three-soliton solutions are presented through solving the coupled nonlinear Schrodinger equations. The condition for forming all-optical logic devices (AOLDs) is discussed. Besides, the performance of the AOLD is analyzed. Results of this paper have theoretical research significance for the application of the AOLD.

All Optical Scalable Logic Gates Using Si 3 N 4 Microring Resonators

Abstract: In this paper, microring resonator-based logic gates are discussed that operate on same input and output wavelength. Same input and output wavelength allows the cascaded operation of the developed logic gates and thus can be utilized for developing photonic integrated circuits. Logic operations such as and , or , nor , xor , and xnor are successfully demonstrated. Optical Kerr effect is utilized for operation and structures are numerically simulated using coupled mode equations. Output power levels of around 0.18 and 0.05 W are achieved for high- and low-power logic, respectively. The proposed structures perform well for data rate under 1 Gbps and are analyzed to determine the acceptable input range for high- and low-power logic, respectively. The cascaded operation of proposed logic gates is also demonstrated.

High-performance and ultrafast configurable all-optical photonic crystal logic gates based on interference effects

Abstract: This paper presents a configurable structure to realize all-optical photonic crystal logic gates based on the interference effects. The photonic crystal waveguides are realized by creating defects in a square lattice of silicon rods in the air. The proposed structure consists of four input ports, including two ports for applying input signals of logic functions and two ports for applying control signals. Therefore, all-optical NOT, OR, XOR, AND, NOR, and NAND logic gates as well as $${\overline{\text{A}}} \cdot {\text{B}}$$ and $${\overline{\text{A}}} + {\text{B}}$$ logic functions can be implemented. Simulations are performed using the finite-difference time-domain method. The simulation results show high extinction ratios (ERs) of logic gates operating in the optical communication C band. The lowest ERmin is related to the NAND logic gate with a value of 14.2 dB at the wavelength of 1.55 μm. The maximum propagation delay is equal to 285 fs, corresponding to the OR and AND logic gates. Also, the total footprint of the structure is about 192 μm2. The presented configurable structure is a promising candidate for use in integrated photonic circuits.