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LED Receiver Impedance and Its Effects on LED-LED Visible Light Communications

机译：LED接收器阻抗及其对LED LED可见光通信的影响

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This paper experimentally demonstrates that the AC impedance spectrum of the light-emitting diode (LED) as a photodetector heavily depends on the received optical power, which may cause the impedance mismatch between the LED and the post trans-impedance amplifier. The optical power dependent impedance of the LED is well fitted by a modified dispersive carrier transport model for inorganic semiconductors. The bandwidth of the LED-LED visible light communication link is further shown to decrease with the optical power received by the LED. This leads to a trade-off between link bandwidth and SNR, and consequently affects the choice of the proper data modulation scheme. The discovery of light-controllable AC impedance of LEDs and its preliminary theoretical model may shed new light on the study of simultaneous photoelectric and electro-optic responses of LEDs.
机译：本文实验表明，作为光电探测器的发光二极管（LED）的AC阻抗谱很大取决于所接收的光功率，这可能导致LED和后阻抗放大器之间的阻抗不匹配。 LED的光功率依赖性阻抗通过用于无机半导体的改进的分散载波传输模型良好装配。进一步示出了LED LED可见光通信链路的带宽以通过由LED接收的光功率降低。这导致链路带宽和SNR之间的权衡，因此影响适当的数据调制方案的选择。 LED可光控AC阻抗的发现及其初步理论模型可能揭示了LED的同步光电和电光响应的研究。

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