Fig. 8From: High-speed visible light communication systems based on Si-substrate LEDs with multiple superlattice interlayersSchematic illustration of a VLC system model. a Schematic diagram of a typical VLC system. b Illustration for the signal response for LEDs with different optoelectronic characteristics. c Impact on signal response when the neutral density (ND) filter is applied or not applied. The baud rate of train signal is 550 MBaudBack to article page