Performance Analysis of Hybrid Optical Amplifiers for Multichannel WDM Systems

Abstract

For the need of higher capacity and speed optical fiber communication systems are being extensively used all over the world for telecommunication, video and data transmission purposes. Multimedia optical networks are the demands of today to carry out large information like real time video services. Presently, almost all the trunk lines of existing networks are using optical fiber. This is because the usable transmission bandwidth on an optical fiber is so enormous (as much as 50 THz) as a result of which, it is capable of allowing the transmission of many signals over long distances. 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 amplifier have attracted much attention as they are amplifies the broad bandwidth. The hybrid optical amplifier has wide gain spectrum ease of integration with other devices and low cost. This thesis is mainly concerned with the use of hybrid optical amplifiers in multichannel wavelength division multiplexing (WDM) optical communication system and network. The aim of investigation is to increase the transmission distance and amplify broad bandwidth optical networks by optimizing hybrid optical amplifiers. The performance of various optical amplifiers and hybrid amplifiers and the performance have been compared on the basis of transmission distance, dispersion. Various types of configurations of hybrid optical amplifiers have been used for the better study of hybrid optical amplifier. It is observed that as we used less number of channels then SOA provide better results. By the increasing of channels SOA degraded the performance due of non-linearity induces. To overcome that problem the RAMAN amplifier is the best alternative. We further optimized the hybrid optical amplifier (RAMAN) using different parameter of RAMAN and EDFA such as Raman fiber length, Raman pump wavelength, Raman pump power, EDFA noise figure and EDFA output power. Using this optimized hybrid optical amplifier we have achieved maximum single span distance for different dispersions.