• Laser & Optoelectronics Progress
  • Vol. 59, Issue 1, 0123001 (2022)
Yan Zhang, Mengfan Li, and Deyuan Chen*
Author Affiliations
  • College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts andTelecommunications, Nanjing , Jiangsu 210023, China
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    DOI: 10.3788/LOP202259.0123001 Cite this Article Set citation alerts
    Yan Zhang, Mengfan Li, Deyuan Chen. Design and Optimization of Half-Adder Based on Two-Dimensional Photonic Crystal[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0123001 Copy Citation Text show less

    Abstract

    In this study, line defects and point defects are introduced in a complete two-dimensional triangular lattice silicon. Using waveguide coupling and linear interference, an all-optical half-adder structure based on photonic crystal is proposed. The half-adder consists of waveguide beam splitters, an all-optical logic AND gate and an all-optical logic XOR gate. Using Rsoft software, combined with the plane-wave-expansion method and the finite-difference time-domain method, the proposed half-adder is simulated. Results show that the contrast ratios of the "carry" and "sum" ports of the proposed half-adder are 4.67 dB and 10.77 dB when the input-light wavelength is 1530 nm, and the response time is about 2.67 ps. In order to improve the contrast ratio of the "carry" port, the structure of the half-adder is optimized. The contrast ratios of the "carry" and "sum" ports of the optimized half-adder are 8.26 dB and 15.34 dB, respectively, and the response time is 3.67 ps. Theoretically, it can reach a data transmission rate of 0.273 Tbps. The proposed half-adder with optimized structure has the characteristic of high contrast ratio, and plays an important role in all-optical signal processing systems and integrated optical circuits.
    Yan Zhang, Mengfan Li, Deyuan Chen. Design and Optimization of Half-Adder Based on Two-Dimensional Photonic Crystal[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0123001
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