Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Mach


Simulation & Evaluation of (OADM) Based on Bragg Gratings and 3dB MMI Couplers

Aied K. Mohammed; Raheel J. Hassoon

Engineering and Technology Journal, 2015, Volume 33, Issue 2 engineering, Pages 400-414
DOI: 10.30684/etj.2015.101909

In this paper, an approach has been proposed to design an (OADM) made in silica- on silicon waveguide by combining Bragg gratings (BGs) and 2x2 3dB multimode interference couplers (3dB MMI coupler) in a Mach-Zehnder interferometer. This design technique shows an interesting result to obtain low insertion loss, low return loss, insensitive to polarization, high thermal stability, large optical bandwidth and low crosstalk.

NUMERICAL SIMULATION FOR HIGH- SPEED ALL- OPTICAL BOOLEAN GATES

Inmar N. Ghazi

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1143-1157

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.