200 Mb/s visible optical wireless transmission based on NRZ–OOK modulation of phosphorescent white LED and a pre-emphasis circuit
CHINESE OPTICS LETTERS(2014)
摘要
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 x 10(-7) which is below 10(-6). The VLC link operates at the room illumination level of similar to 1000 lx at 1.1 m range using a single 1 W white LED.
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关键词
free space optical communication,optical communications,modulation
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