الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
 |  | from | 89 |  |  |
| | | from | 89 | | |
Abstract
In this thesis, design of high velocity fiber-optic communication networks with ultra-wide-dense wavelength division multiplexing (UW-DWDM), space division multiplexing (SDM) and optical transmission techniques is presented.
All connects in the (SDM) are split into subgroups of various chemical and geometrical characteristics.
The parameters have been designed at: i) Δn, the relative refractive index difference for both the core and also the clad, ii) x%, the percentage of doping in silicon material by Germanium material.
The Δn and x% parameters are also preserved during their technological boundaries of attention. UW-DWDM has 1200 channels that transferred at the fiber-optic wavelengths from 1450 nm up to 1650 nm within 140 connects from UW-SDM wherever every connect is prepared to own the same compressed chromatic dispersion.
from this technique, it is noticed that the connect design parameters suffer more nonlinearity with the number of connects. So, two different propagation techniques have been used to investigate the transmitted bitrate as a criterion to enhance the system performance.
The first technique is Soliton propagation, where the control parameters lead to equilibrium between the pulse spreading due to dispersion and the pulse shrinking because of nonlinearity.
The second technique is the maximum time division multiplexing (MTDM) technique where the parameters are adjusted to lead to minimum dispersion
Two cases are investigated: no dispersion cancellation and dispersion cancellation. The investigations are conducted over an enormous range of the set of controlling parameters. Thermal effects are considered through three basic quantities, namely: the transmission bit rate, the dispersion characteristics, and the spectral losses.
Also In the thesis, design with practical data for parameters to maximize the transmission bit-rate, Br for improvement of performance in advanced optical networks with ultra-high speed long-haul repeater spacing and ultra-wide-dense wavelength division multiplexing (UW-DWDM) technique for two optical transmission channels are processed, namely, Germania doped silica fibers and fluoride fibers.
Five basic models of transmission bit rates techniques have been processed to investigate.
The thermal effects are also considered through the thermal dependence of the channel links refractive index, chromatic dispersion, and spectral losses. The set of variables which maximizes the bit-rate and the fiber length are possess negative correlations. It is also found that fluoride fiber is thermally stable than Germania doped fiber.
Long distance transmission of multimedia services and multichannel optical communication systems has led to high capacity optical fiber networks for high speed data transmission and large bandwidth to grow the networks without repeater spacing.
The three technologies played an important role in the remarkable progress of fiber-optic transmission systems: The development of single mode fibers for high speed and large capacity transmission; the identification of the low-loss wavelength region from 1.45 to 1.65 m and the development of high speed opto-electronic devices [1,2,3].
The technologies will be realized through both the separate and combined evolution of inherent lightwave capabilities along with time, wavelength, and space domain optical processing techniques.
Dispersion of the transmitted optical signals transmission along distances optical fibers are increased, therefore, is big problem, to solve this problem, there are some of methods such as dispersion compensated fiber, optical solitons pulses[4,5,6]. The ksoliton pulses is fixed shape and power for balanced between optical fiber nonlinearity with the optical dispersion [7,8,9].
So, two optical transmission media namely optical fibers made of either Germania-doped silica or ZBGA fluoride fibers are processed under special conditions in order to possess high data rates with the following considerations:
1. The use in local and wide area network.
2. The use of dense wavelength division multiplexing technique (DWDM).
3. The employing of soliton propagation mode.
4. The study of the thermal penalty.