الفهرس 
Introduction and OverviewOnly 14 pages are availabe for public view
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Abstract
it is known that the optical channels can accommodate huge capacities
of optical signals so , Wavelength Division Multiplexing (WDM)
system plays a crucial place in the design of high capacity optical
network. The Fast Fourier Transform Beam Propagation Method (FFTBPM)
has been used for simulating an optical beam through a medium
with a small variations of refractive index .Here in this research,
appropriate inhomogeneous medium (medium with different refractive
indexes) is designed to make a demultiplexing process for two optical
gaussian beams with different wavelengths , incident at the same angle
and from the same point in this medium .The spatial and angular
separation of a tilted Gaussian optical beams are investigated. Here, we
focused on two special wavelengths 1.33μm and 1.55μm. and at last ,
we compared our results with the natural phenomenon (microwave
propagation)
The main objective of this thesis is to provide :
1. Overview about different types of beam propagation methods and
its applications .
2. Study the Fast Fourier Transform BPM and how it is being able to
propagate and simulate the optical beams .
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3. Generation of an inhomogeneous refractive index profiles to
make efficient demultiplexing between two optical beams with
different wavelengths .
4. Using these refractive index profiles to give the greatest angular
and spatial separation between these optical beams .