Ultra-fast all optical half-adder realized by combining AND/XOR logical gates using a nonlinear nanoring resonator

We proposed an optical half-adder design using nonlinear materials, photonic crystal structure shape of hexagonal lattice layout, and silicon dielectric rods in the air bed. The optical half-adder structure is designed and optimized by combining the AND and XOR logic gates. The compound AlGaAs is us...

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Bibliographic Details
Published in:Applied optics (2004) 2020-08, Vol.59 (22), p.6459
Main Authors: Sami, Parisa, Shen, Chao, Hosseinzadeh Sani, Mojtaba
Format: Article
Language:English
Subjects:
Adding circuits
Aluminum gallium arsenides
Crystal lattices
Crystal structure
Finite difference method
Gates
Hexagonal lattice
Logic circuits
Photonic crystals
Response time
Time lag
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Summary:We proposed an optical half-adder design using nonlinear materials, photonic crystal structure shape of hexagonal lattice layout, and silicon dielectric rods in the air bed. The optical half-adder structure is designed and optimized by combining the AND and XOR logic gates. The compound AlGaAs is used as a nonlinear material in the structure. The linear part of AlGaAs material is n 1 = 1.4 , and the nonlinear part is n 2 = 1.5 × 10 − 17 . The main performance for all-optical logic gates is set at an operating wavelength of 1.55 µm. The time delay at all optical gates provided has a 3.1 PS response time with on/off contrast ratio for SUM and CARRY ports of 12.78 dB and 12.9 dB, respectively, and the bit rate is 0.322 Tb/s. In the best case, the 1/0 contrast ratio between input = 1 and input = 0 is 4.59 dB. The computations are performed using the finite difference two-dimensional method.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.392428