الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Different optical techniques are used for the Wave division multiplexing
(WDM) process to Increase the transmission capacity of an optical
communication line to send more than one wavelength “λ” (color) in the
same guiding structure.
This multiplexing process can be done by different techniques such as:
prisms and grating. At the receiving end we need to separate the sent
wavelengths; this can be done by a “de-multiplexer”.
The de-multiplexing process is a delicate problem because it
requires very narrowband optical filters to separate the different
wavelengths from the received composite optical signal. This demultiplexing
process can be done by different techniques such as: prisms,
superprisms, diffraction grating, arrayed waveguide grating, mach-zehnder
interferometer, spectral filters and acousto-optic filter plus polarizing beamsplitter.
In this research we will talk about a promising and fast developing
technique: SPATIAL Wavelength Division DE-multiplexer that can be used as
a de-multiplexer device. This technique depends on Goos-Hänchen shift
phenomena in which a light beam is reflected off an interface between two
dielectric media. The Method used to Study the propagation of complex
optical beams in spatially varying media [n(x, y, z)] in our research is called
Fast Fourier Transform Beam Propagation Method [FFT-BPM].
We shall investigate the transmitted beams to find out the angle of incidence
around the critical angle which result in maximum separation between the
refracted beams in the rarer medium (highest ΔӨT) .Maximizing the angle
between the refracted beams at two different wavelengths is our goal, since
this allows the fabrication of an efficient reliable and simple spatial
wavelength division de-multiplexer.