Functional all-optical logic gates for true time-domain signal processing in nonlinear photonic crystal waveguides

Vakhtang Jandieri, Ramaz Khomeriki, Tornike Onoprishvili, Douglas H. Werner, Jamal Berakdar, Daniel Erni

Research output: Contribution to journalArticle

Abstract

We present a conceptual study on the realization of functional and easily scalable all-optical NOT, AND and NAND logic gates using bandgap solitons in coupled photonic crystal waveguides. The underlying structure consists of a planar air-hole type photonic crystal with a hexagonal lattice of air holes in crystalline silicon (c-Si) as the nonlinear background material. The remaining logical operations can be performed using combinations of these three logic gates. A unique feature of the proposed working scheme is that it operates in the true time-domain, enabling temporal solitons to maintain a stable pulse envelope during each logical operation. Hence, multiple concatenated all-optical logic gates can be easily realized, paving the way to multiple-input all-optical logic gates for ultrafast full-optical digital signal processing. In the suggested setup, there is no need to amplify the output signal after each operation, which can be directly used as a new input signal for another logical operation. The feasibility and efficiency of the proposed logic gates as well as their scalability is demonstrated using our original rigorous theoretical formalism together with full-wave computational electromagnetics.

Original languageEnglish (US)
Pages (from-to)18317-18331
Number of pages15
JournalOptics Express
Volume28
Issue number12
DOIs
StatePublished - Jun 8 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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