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arXiv · 1709.05921

LED receiver impedance and its effects on LED-LED visible light communications

Shangbin Li·Boyang Huang·Zhengyuan Xu
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Abstract

This paper experimentally demonstrates that the AC impedance spectrum of the 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 dada modulation scheme.

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Shangbin Li, Boyang Huang, Zhengyuan Xu. 2017-07-11. LED receiver impedance and its effects on LED-LED visible light communications. https://arxiv.org/abs/1709.05921

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