Abstract— This document describes a modification of point-topoint FSO (free space optics) called Ronja for laboratory requirements. The device operates in the visible red spectrum with a communication speed of 10 Mbps full-duplex over a distance of 900 metres. Ronja was adjusted for the needs of laboratory assignments, where additional voltmeters measure RSSI (received signal strength indication) at both ends of the link. The measuring device provides adjustment of power of the transmitting LED via computer, measures and sends RSSI values to a PC via USB or RS232, turns off the Ronja device together with the computer. Own design of the mechanical construction for targeting the pipes of Ronja was developed.
Keywords—FSO, Optical wireless transmission, Ronja.