In this book, several challenges face researchers and communication, engineering students. Especially, when handling project for fiber optic network and picking the suitable software to be used. As they are looking for software to meet their needs and requirement to perform analysis for fiber optic communication and design a powerful model that could support the utilization of advanced modulation methods and have a proper analysis of the results. So, this book clarify the software of Optisystem in easy way and gives a lot of information that can help reader to get full knowledge about the software.