750 Mb/s monochromatic LED-based real-time visible light communication system employing a low-complexity cascaded post-equalizer

We experimentally demonstrate a 750 Mb/s real-time visible light communication (VLC) system based on non-return-to-zero on–off keying modulation by employing single commercially available monochromatic light-emitting diodes. To enhance the 3-dB bandwidth of the VLC link, we propose a low-complexity cascaded post-equalizer based on NPN transistors. With two different frequency-selecting networks in our post-equalizer, the highest achieved 3-dB bandwidth of the VLC link is 370 MHz. The highest achieved data rate is 750 Mb/s at a communication distance of 170 cm with a bit error rate below 1×10 6, which is far below the forward error correction limit (3.8×10 3). Based on our monochromatic VLC system, a wavelength-division multiplexing VLC system could be designed with a higher data rate.