It is an increasing problem in the broadband infocommunication, that the radio frequency part of electromagnetic spectrum gets saturated gradually, when there are more and more users and applications need more and more speed for data transmission. The most obvious solution for this problem is the still unexploited visible light communication (VLC), that offers an excellent opportunity for realising small, high-speed networks by the LED technology, both inside and in special (for example underwater) conditions.
I start my thesis with the structure of VLC networks, the advantages and disadvantages of this technology, and the currently applied and potential future modulation schemes. In my work I demonstrate the possible applications of VLC, particularly its special application, the underwater optical communication.
In the second part of the thesis I specify the design process of a VLC transmitter, that color of light can be controlled by a microcontroller. Then I continue with the results of measurement including the generated signals of the transmitter, and the assessment of the behaviour of the circuit in frequency domain, based on the received signals.