Nowadays telecommunication would be impossible without high-bandwidth optical networks, which are increasingly replacing the copper-based networks. The latest trend in optics is flexgrid, which is a kind of technology that can manage channels with different bandwith. The orthogonal frequency-division multiplexing technique has been marked as the transmission technology of this flexible networks. It has never been used in optics, so it is practical to simulate this technology before using.
The aim of my thesis is the simulating of optical OFDM systems, and the determination of rules for real network planning. By the advantages and disadvantages of the technology, I chose the coherent OFDM transmission to simulate, because this is the most suitable for optics. I use the theory to make a measuring arrangement, that can used as a model for demonstrating the characteristics of the transmission. I examine this model in the VPI optical simulator. This model represents a coherent OFDM system with homodyne receiver. Among other things, I am looking for the limits of the technology and the software. Based on my results I simulate an OFDM transmission on a point-to-point optical link from a real network topology.