Author : Besim Limani

Telecommunication networks now days require high speed and transmission capacity. Such a trend is present in Kosovo too. The overall backbone transmission technology in Kosovo is based on fiber optic. To reach this requirement it is necessary to develop and use optical networks which are based on advanced optical technologies, such as WDM/DWDM transmitting technology and different amplifiers. However, the communication systems with fiber optic are facing with different problems with the signal losses such as attenuation, dispersion, scattering, absorption etc. The developments of new methods and devices in optical technology make significant improvements, and they have strong impact on transmission performance on communication systems with fiber optics. The main focus in this case study at my paper would be aimed to achieve an improvement in performance in transmission systems with optical fiber in the real transmission backbone line between two capitals Pristina – Skopje with a distance length ~ 109 km, using OptiSystem 13.0, which is a simulator device. My target in this paper is to analyze two cases of the transmission system 10 Gbps and 40 Gbps. The first transmission cases will be without EDFA (Erbium Doped Fiber amplifier) amplifier, and in the second case I will use EDFA amplifier. From these two cases we will see the difference between transmission line with EDFA amplifier and without EDFA amplifier in the transmission system 10 Gbps and 40 Gbps. The results which I have presented in graphical and tabular form will clearly show the impact of amplifiers in increasing the quality of the transmitted signal by using the EDFA amplifiers in transmission systems with fiber optics will help for achieving a long distances transmission and high capacity, without needing to add additional optical cables, in such way will maintain low cost of transmission systems.

Keywords: Optical fiber, WDM technology, EDFA amplifier, backbone line, Transmission.