Fig. 4From: High-speed visible light communication systems based on Si-substrate LEDs with multiple superlattice interlayersa-c S21 parameters of Sample A-C under different injection current from 50 mA to 300 mA. Their − 10-dB bandwidth values at 50 mA and 300 mA are marked. d The − 10-dB bandwidth of three samples under different currentBack to article page