200 Mb/s visible optical wireless transmission based on NRZ–OOK modulation of phosphorescent white LED and a pre-emphasis circuit

We present a high-speed visible light communication（VLC） link that uses a commercially available phosphorescent white light-emitting diode（LED）. Such devices have few megahertz bandwidth due to the slow response of phosphorescent component,which severely limit the transmission data rate of VLC system. We propose a simple pre-emphasis circuit. With blue-filtering and the pre-emphasis circuit,the bandwidth of VLC system can be enhanced from 3 to 77.6 MHz,which allows non-return-to-zero on-off-keying（NRZ–OOK） data transmission up to 200 Mb/s with the bit error ratio of 5.3 × 10-7 which is below 10-6. The VLC link operates at the room illumination level of 1000 lx at 1.1 m range using a single 1 W white LED.