الفهرس 
Circuit Switching techniqueOnly 14 pages are availabe for public view
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Abstract
The word of communication is in a big need for a high performance data
network and high-speed data processing units, which can face the big data traffic in
existing global network. Optical communication systems have introduced a way to
overcome this demand, but these systems have still being developed.
The existing core network around the world consists of access devices for end
users, distribution devices for interconnection between access devices and core
devices for interconnection between distribution devices and then connecting to the
internet, there is also servers like ISP (internet service provider), which it is a
company with powerful computers supports the internet services.
The core network supports connectivity and routing services between
different parts of the network and controls the flow of traffic between these parts.
The core network is designed to be fast, reliable, scalable, and more secure, and is
perceived to be the most critical part of a communication network. It’s hardware as
a whole is consists of switching devices, interconnections medium , end users and
other network devices, the interconnections medium has become optical fiber with
ultra wide non occupied bandwidth, but all other devices in the network are still
electronic operated or optoelectronic operated.
Therefore, the core network devices are using two types of techniques. One
technique of them is opto-mechanical, which uses mechanical elements such as
MEMS (Micro Electro-Mechanical Systems) technique or uses electro optic
elements like MZI (Mach-Zehnder Interferometer). The other technique uses the
electronic switching technique based on conversions from optical domain to
electrical domain for processing and then back to the optical domain. Those two
types of the core network devices are unfortunately have disadvantages like low
switching speed, high power consumption, high insertion loss, high crosstalk, low
stability with high Bit Error Rate (BER) and big integrated size.
This thesis is concerned with a three-proposal core network devices, which
they are fully optical operated. One proposal design is the full optical switch, the
second proposal device is the full Optical RAM (Random Access Memory) and the
third proposal device is the full optical oscillator. These three proposal devices will
enhance the environment of computer and optical communication network in power
consumption, speed and signal quality.