الفهرس 
Introduction in Optical CommunicationOnly 14 pages are availabe for public view
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Abstract
For the need of larger capacity and higher speed, optical fiber communication systems are being extensively used all over the world for telecommunication, video and data transmission purposes. However, attenuation is the major limitation imposed by the transmission medium for long-distance high-speed optical systems and networks. So with the growing transmission rates and demands in the field of optical communication, the electronic regeneration has become more and more expensive. The powerful optical amplifiers came into existence, which eliminated the costly conversions from optical to electrical signal and vice versa. The hybrid optical amplifiers EDFA-Raman have attracted much attention as they amplify the broad bandwidth. This thesis is mainly concerned with the use of single and hybrid optical amplifiers in dense multichannel wavelength division multiplexing (DWDM) optical communication system. The aim of investigation is to increase the transmission distance, minimize the BER and maximize the quality factor (QF). The first section of this thesis studies the all optical signal processing of optical Raman amplifier. In addition to, it studies the o/p signal power, Raman gain, and net gain for different fiber types in the case of forward and backward pumping with different pumping power. The second section presents the design of 16×10Gbps and 40×10Gbps DWDM techniques to provide a large number of transmission channels. Moreover it studies the performance of Raman, EDFA and Raman-EDFA amplifiers in terms of transmission distance, BER and quality factor (QF). Furthermore this thesis introduces a comparison between Raman-EDFA Hybrid amplifier as preamplifier and Raman-EDFA Hybrid amplifier as inline amplifier in terms of optical output power variations, gain variations, the maximum Q-Factor and minimum BER. Finally, this thesis calculates the number of spans and the length of each span which will give maximum transmission distance for EDFA as single amplifier and Raman-EDFA as hybrid amplifier.