Simulation of an optical logic gate by optical dark soliton with pulse position modulation (DPPM) in As40S10Se10Chalcogenide glass

Pulse position modulation (PPM) already have been done by the bright optical solitons.In this paper we propose the operation of an all-optical logical gate by using optical dark soliton in a symmetric nonlinear directional coupler (NLDC) with pulse position modulation (DPPM). We could design AND/OR logic gatewith suitable parameters by using DPPM. We have used As40S10Se10 chalcogenide material for its high nonlinearity and positive dispersion.

Keywords:

Nonlinear directional coupler (NLDC) , Dark pulse position modulation (DPPM) , dark soliton , AND/OR logicgate , Chalcogenide glasses