الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The advent of optical transmission and Dense Wavelength Division Multiplexing (DWDM) technology has transformed the technology and also the economics of optical network deployments. In less than 10 years the capacity of a single optical fiber equipped with commercial transmission equipment has increased from 2.5 Gbit/s to 1600 Gbit/s a factor of close to 1000.The economics of DWDM are driving the development and deployment of a new generation of ultra long haul DWDM systems that can carry these high capacity data streams over thousands of kilometers. During the same period, driven by the growth of the internet and other data based services, the demand for new capacity has exploded and the requirements for public network have changed dramatically. Commonly used methods for estimating system performance are presented. The focus is on techniques used for calculating the bit error rate (BER), the translation of pulse timing jitter to BER is outlined, and a simple method of considering its impact on the system performance is presented. We cast the light on the innovation of using FEC in optical communication systems, and then we study the effects of using new coding schemes (i.e. PCCC, SCBC and CZC) as FEC in optical communication systems. We investigated Raman gain with forward pumping using only four pumping lasers for DWDM system. Considering the threshold power for various pumps, the composite working band and the Amplified Spontaneous Emission (ASE) noise are also estimated using the actual band model. Then, we investigate the use of coaxial fiber with single pump laser, which gives reasonably flat Raman gain spectrum.