Design of One-Bit Magnitude Comparator using Photonic Crystals

2019 ◽  
Vol 40 (4) ◽  
pp. 363-367 ◽  
Author(s):  
Sapna Rathi ◽  
Sandip Swarnakar ◽  
Santosh Kumar
Keyword(s):  
Photonic Crystals ◽  
Finite Difference Time Domain ◽  
Lattice Structure ◽  
Sequential Circuits ◽  
Nonlinear Material ◽  
Time Domain Simulation ◽  
Matlab Simulation ◽  
All Optical ◽  
Combinational And Sequential Circuits ◽  
Difference Time

Abstract At present, photonic crystals (PhCs) are used to design various combinational and sequential circuits. In this paper, an all-optical one-bit magnitude comparator is proposed using PhC waveguide without using nonlinear material. It is based on beam interference principle, using T-shaped lattice with silicon dielectric rods in air background. It is demonstrated through finite-difference time-domain simulation and verified numerically using MATLAB simulation. The size of PhC lattice structure can be as small as 19.167a×19.167a, where ‘a’ is the lattice constant of the PhC.

All-Optical Half-Adder Circuit Based on Beam Interference Principle of Photonic Crystal

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Sandip Swarnakar ◽  
Santosh Kumar ◽  
Sandeep Sharma
Keyword(s):  
Integrated Circuits ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Sequential Circuits ◽  
Square Lattice ◽  
Xor Gate ◽  
Half Adder ◽  
All Optical ◽  
Combinational And Sequential Circuits ◽  
Difference Time

AbstractNow a day’s photonic crystals (PhCs) are in trends for designing of various integrated circuits like combinational and sequential circuits. The designing of all-optical half adder circuit based on beam interference principle, using T-shaped square lattice with silica dielectric rods in air background, is proposed. This design is a combination of two structures: one part of it works as AND gate and other part works as XOR gate. This structure is simulated using finite difference time domain (FDTD) method and verified numerically using PWE band solver and also using MATLAB.

Compact and ultrafast all optical 1-bit comparator based on wave interference and threshold switching methods

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asghar Askarian
Keyword(s):  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Logical Structure ◽  
Ring Resonators ◽  
Plane Wave Expansion ◽  
Threshold Switching ◽  
Wave Interference ◽  
All Optical ◽  
Fdtd Methods ◽  
Difference Time

Abstract In this study, we are going to design all optical 1-bit comparator by combining wave interference and threshold switching methods. The final structure composed of two nonlinear ring resonators and seven waveguides. The functionality of the suggested logical structure is analyzed and simulated by using plane wave expansion (PWE) and finite difference time domain (FDTD) methods. According to results, the proposed all optical 1-bit comparator has faster response and smaller footprint than all previous works. The maximum ON-OFF contrast ratio, delay time and area of the suggested optical comparator are about 16.67 dB, 1.8 ps, and 513 µm2, respectively.

scholarly journals A novel proposal based on 2D linear resonant cavity photonic crystals for all-optical NOT, XOR and XNOR logic gates

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Kouddad Elhachemi ◽  
Naoum Rafah
Keyword(s):  
Finite Difference Time Domain ◽  
Resonant Cavity ◽  
Logic Gates ◽  
Low Power Consumption ◽  
Plane Wave Expansion ◽  
Novel Structure ◽  
All Optical ◽  
Easy Integration ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

AbstractIn this paper, we are going to propose a novel structure of all-optical NOT, XOR and XNOR logic gates are presented using a two-dimensional photonic crystal (2D-PhC). This structure is optimized by varying the radius of the cavity, to obtain a quality factor Q = 1192, and also has several ports of entry and one port of output. The size of each structure is equal to 85.8 μm2. The contrast ratios for the structures proposed all-optical NOT, XOR and XNOR logic gates between levels “0” and “1” are, respectively, 25.08, 25.03, and 14.47 dB. The response time for the three logical gates is 8.33 ps, and the bit rate is calculated at about 0.12 Tbit/s, all simulations are based on both numerical methods such as finite difference time domain (FDTD) and plane wave expansion (PWE). Designed logic gates are characterized by low power consumption, compactness and easy integration.

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