VCSEL and multi-mode fiber applications in Radio-over-Fiber systems

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Supervisor:
Kovács Gábor
Department of Broadband Infocommunications and Electromagnetic Theory

The Radio over Fiber (RoF) system is become more important area of the optical networks, because it combines the mobility of the wireless communication with the high capacity of optical communication. By applying that, one or more wireless standards (WiFi, WiMAX, GSM) could be transmitted by optical fibers. The RoF system is efficiently usable in buildings, so there are many mobil cells in this system. Because of the high number of cells, a lot of remote antenna unit have to be installed, therefore the low price of these items is the most important view-point.

For a cost effective solution, I used laser diode( Vertical Cavity Surface Emitting Laser, VCSEL), which is cheaper to fabricate. Installed multimode fibers often could be found in buildings, so the price of the installation can be saved, and I also used multimode fiber at the RoF link. By the investigation, I had to design, fabricate, simulate, and measure a RoF connection. I designed a RoF connection with the drive circuits, and then I fabricated them. This link’s transmission paramaters were investigated by simulations and measurements. During the investigation I found the limitations of the connection. To solve this problem I gave a transmissio

I measured and simulated a self-designed cost effective RoF connection. I found limitations of this RoF link, and then I tried to solve this limitation problem. In the future I would like to extend this RoF connection for using more wireless standards together. Furthermore I would like to improve the transmission parameters of the link by using more effective optical and electrical devices

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