NUMERICAL SIMULATION FOR HIGH- SPEED ALL- OPTICAL BOOLEAN GATES

N. Ghazi, Inmar

doi:10.30684/etj.26.9.10

	NUMERICAL SIMULATION FOR HIGH- SPEED ALL- OPTICAL BOOLEAN GATES
Engineering and Technology Journal
Article 1, Volume 26, Issue 9, 2008, Pages 1143-1157 PDF (466.84 K)
DOI: 10.30684/etj.26.9.10
Author
Inmar N. Ghazi
Abstract
In this paper few high speed (i.e. as high as 80 GB/s) all-optical logic gates has been studied. These logic gates include a ( 80Gb/s XOR ) gate using semiconductor optical amplifier (SOA) based Mach-Zehnder interferometer incorporated with a delayed interferometer (DI), The performance of XOR operation has been investigated using numerical simulations. The quality of the XOR result is improved using a (DI) delayed interferometer after the Mach-Zehnder interferometer. . A (80Gb/s XNOR) gate using four wave mixing (FWM) in highly nonlinear fibers (HNLF) have been studied also, the four wave mixing process is a very fast process in fibers ,the nonlinear Schrödinger equation that describes (FWM) process in fiber is solved numerically using the split-step Fourier transform method ,this scheme is capable of operating at a data rate as high as 250Gb/s ,finally A(40Gb/s) NOR gate operation has been analyzed by a numerical solution of the SOA rate equations. To investigate the quality of NOR operation by simulation, Q factor of the NOR output signal has been calculated. Q factor gives the information of the optical signal to noise ratio in digital transmission .All numerical simulation programs performed through Matt-Lab 7.0 prgram.
Keywords
All; Optical; logic gates; semiconductor optical amplifier; Mach; Zehnder interferometer; nonlinear Schr; XOR gate; XNOR gate; NOR gate

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