What is it about?

All-optical logic gates; photonic crystals; ultra-high bit rate; multi-wavelength operation; simultaneous operation; contrast ratio

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Why is it important?

In this paper, a novel two-dimensional photonic crystal based all-optical AND/OR logic gates are designed, simulated and optimized. The structure is built on a linear square lattice photonic crystal platform. A multi-wavelength operation, together with a simultaneous operation, is achieved at ultra-high bit rates. The concurrent operation is attained without altering the proposed design continuously, as stated in the literature. It provides simplicity because there is no auxiliary input required along with the absence of externally attached phase shift units. The enhancement process has been done to the rod radius. A magnificent representation tool is developed. The benefit of the mentioned tool lies in the data combination of different operating wavelengths, contrast ratio, and bit rate; which will establish an efficient optimization process. Each gate is enhanced independently, then an overall improvement has been done. As a result, the operation at 1.52 µm will provide a successful multi logic gate operation with ultra-high bit rates of 6.76 and 4.74 Tbit/s for AND and OR logic gates, respectively. The design has an acceptable size of (19.8 ×12.6 µm) and a contrast ratio of 9.74 dB and 17.95 dB for the designed AND and OR gate, respectively. The design is highly sensitive to the waveguide length to verify the gates on demand.


This article introduce one of the most important application based on photonic crystal. An AND/OR all optical logic gate with remarkable properties is investigated (i.e. multi-wavelenth operation, high bit rate,...)

Tamer Mostafa
Egyptian Russian University

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This page is a summary of: Ultra-High bit rate all-optical AND/OR logic gates based on photonic crystal with multi-wavelength simultaneous operation, Journal of Modern Optics, April 2019, Taylor & Francis, DOI: 10.1080/09500340.2019.1598587.
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