Hybrid Access Network xPON/xDSL

Abstract

The aim of this master thesis is to build up experimental hybrid xPON/xDSL, specifically hybrid EPON/ADSL and EPON/VDSL network, together with deployment of the semiconductor optical amplifiers. The first chapter of the theoretical part is focused to describe access networks in consideration of the used transmission medium. The explanation of the transmission channel and transmission techniques applied in DSL technology are discussed in the second chapter. Following chapter compares the main standards of DSL technology. Data transmission and principle of operation is discussed in single chapter aimed to EPON network. Principles of amplification, basic parameters, and properties of the semiconductor optical amplifiers are explained in a separate chapter.

Thesis continues with the practical part, where are included the results of all realized measurements. Basic optical measurements (attenuation, dispersion, power level) were performed on the created topologies. The semiconductors optical amplifiers were applied to the EPON network to achieve the gain characteristics of amplifiers and to find out advantages or disadvantages of their use. Then the formed hybrid networks were verified by RFC2544 and ITU-T Y.1564 testing standards to investigate quality of services depending on the fiber and metallic line lengths. Created EPON topology with deployment of the semiconductor optical amplifiers was also designed in OptiSystem software to compare the measured and simulated results.