A performance study of an all-optical logic gate based in PAM-ASK

• Published in: Journal of modern optics 2009-05, Vol.56 (8), p.1004-1013
• Main Authors: Ferreira, Alisson da C., Sobrinho, C.S., Menezes, J.W.M., Fraga, W.B., Rocha, H.H.B., Wirth L., A., Sabóia, K.D.A., Guimarães, G.F., Filho, J.M.S., Sombra, A.S.B.
• Format: Article
• Language: English
• Subjects: all-optical logical gate; all-optical signal processing; amplitude shift keying (ASK); Beam trapping, self-focusing and defocusing; self-phase modulation; Controllers; Exact sciences and technology; Fiber optic networks; Fundamental areas of phenomenology (including applications); nonlinear directional coupler (NLDC); Nonlinear optics; Numerical analysis; Optical computers, logic elements, interconnects, switches; neural networks; Optical elements, devices, and systems; Optical solitons; nonlinear guided waves; Optical waveguides and coupleurs; Optics; Physics; pulse amplitude modulation (PAM); Quantum theory; Simulation; soliton; symmetric dual coupler; Transmitters
• ISSN: 0950-0340; 1362-3044
• DOI: 10.1080/09500340902871371

In this paper a numerical study of an all-optical logical gate based in a symmetric nonlinear directional coupler (NLDC) operating with two ultrashort fundamental soliton pulses of 2ps, modulated by PAM-ASK with binary amplitude modulation to represent the logical level 1 and 0, is presented. The performance of a symmetric dual core NLDC performing two-input logical functions is examined. Initially, we evaluate the effect resulting from an increment in the PAM coding parameter offset (ϵ), considering the anomalous Group Velocity Dispersion (GVD), nonlinear Self Phase Modulation (SPM) in a lossless configuration. We can conclude that is possible to get logical operations for the cores 1 or 2 since a phase control exists which is applied to the input pulse in fiber 1.