Visible Light Communication System with 815 MHz-Modulation Bandwidth Based on Micro-Size Light-Emitting Diode and Post-Equalization Circuit

摘要

In order to get high modulation bandwidth in the visible light communication (VLC) system, the micro-size light-emitting diode (LED) with the diameter of 60 μm and the equalization circuit (EQC) are used. The micro-size LED works under low current density of 707.4 A/cm^{2 to extend its lift time. Four key parameters, including the resistance and the capacitance, in the EQC that consists of a two-stage common-emitter transistor amplifier were modified to adjust the frequency response, and, thus, to tune the 3-dB modulation bandwidth of the VLC system. The experimental results show that the 3-dB modulation bandwidth of the VLC system can be expanded from 94.2 MHz to 815 MHz, if the EQC was applied and optimized.}