The optical networks are becoming more and more important in the telecommunications systems. In addition to the high capacity backbone networks, we can meet more often optical networks in the access network. One of the most important part of the optical access networks is the passive optical network (PON). Several PON structure exists, which have different advantages and disadvantages. The various optical effects (attenuation, dispersion, nonlinear effects) in PON systems have different kind of distorting effects.
I will introduce the most important PON architectures and their characteristics, I’ll describe the operating principles of the various multiplexing methods, and I will show the different kind of optical effects which have affect to the transfer of the optical signal.
The purpose and the main part of my thesis is to simulate the behavior of optical networks. I examined how will the increasing of the transmisson powar or the data rate influence the optical transmission system. In addition to the specified settings I looked into the optimal number of users, or optimal distance, and I examined the affects of the distorting effects in time division multiplexing and wavelength division multiplexing systems.