Fig. 2 shows a diagram of the equalized VLC system under
consideration. The VLC transmitter consists of a white Luxeon
Star LED (with a 45 beam-shaping lens) whose emitted light
is modulated and driven by a data signal and a direct current
(dc) via a bias tee. The dc biases the LED in its linear region
of operation and also creates sufficient average light power for
illumination.