Study of Fiber Optical Amplifier EDFA for Passive Optical Network

Abstract

The aim of this thesis is to explain the issues relating to amplifiers used in optical networks, and especially to erbium-doped fiber amplifiers, which represent the main subject of this work. The thesis is divided into two parts, the first one of which deals with a theoretical basis necessary for understanding the issues of amplifiers, and the second one is focused on constructing the amplifier and on its subsequent testing. The whole work therefore follows the points given in the assignment. In Chapters 2, 3 and 4 we have gradually explained basic physical phenomena, described undesirable effects influencing the characteristics of amplifiers, and presented other types of amplifiers. In Chapter 5 we have focused on a detailed analysis of EDFA amplifiers, and pointed out basic functions, structure and parameters of their individual components. We have also discussed in detail pumping lasers and the doped fiber itself. The second part of the work, initiated by Chapter 6, describes a proposal of the amplifier along with measurements of its properties. We have verified stability of the laser used for pumping, as well as the influence of temperature changes on the doped fiber and also their influence on parameters of the amplifier. Another point of the work consisted in testing the effect of temperature changes of the pump on the parameters of the amplifier. The final part of this thesis resided in connecting the designed amplifier to a real topology and in its subsequent testing.