Simple and Universal Current Modulator Circuit for Indoor Mobile Free-Space-Optical Communications Testing

Stanislav Hejduk, Karel Witas, Jan Latal, Jan Vitasek, Jiri Bocheza, Vladimir Vasinek
2014 Advances in Electrical and Electronic Engineering  
The use of LEDs for illumination and simultaneous communication becomes more and more interesting and it goes hand in hand with the increasing deployment of LEDs to peoples homes and industrial buildings. Modulation of this kind of light sources is difficult because of high voltage and of current demands. Since the LED configurations and the values of current and voltage are different, the universal modulator suggested by the research team of the Department of Telecommunications should be able
more » ... ons should be able to operate even under various circumstances. The objective of this paper is to present a design of a simple and universal current modulator for LED lighting modulation for the frequencies of around 1 MHz. The modulator should allow the initial testing of different types of High Power LEDs and different photodetector configurations and circuits in diffusively based Free-Space-Optical networks. Also, in the experimental part, the results obtained in the testing were compared with some different types of LED light sources.
doi:10.15598/aeee.v12i1.845 fatcat:l556jnr2znbqxfvpmf5qwb5mzu