Abstract
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.
© 2014 Chinese Optics Letters
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