Výzkum zářivých zdrojů pro současné působení v optických komunikacích a osvětlování

Abstract

This dissertation thesis deals with an optical transmitter for indoor free space optical networks, which can provide communication and illumination at the same time. The optical transmitter has a new and original solution of spectral characteristics of the emitted light. The basis of the transmitter is white light, which provides illumination. A narrow spectral part of this white light is purposely suppressed by an optical filter. The suppressed spectral part is then replaced by light from another radiant source and it forms the original white light. The compensatory radiant source will be modulated and due to this it will transmit some useful data. This solution will also provide the other function of the transmitter, i.e. the communication function. The data will be transmitted by one part of the white light spectrum only. Thanks to this solution the disadvantages of the visible light communication will be removed. They include quick switching of the forward current in orders of hundreds of mA and the phosphor persistence on white light creation. The thesis solves the spectral and the geometrical arrangement of the radiant sources. The results are two designs of the optical transmitter. These designs were first tested in LightTools software. The optical transmitters were then constructed in a laboratory and their features were measured. Both designs of the optical transmitter can provide both required functions at the same time, which was the objective of the dissertation thesis.