For the first time, to the best of our knowledge, we experimentally demonstrate that multiple-input-multiple-output (MIMO) processing allows using a single photodiode to detect simultaneously a wavelength-division multiplexing (WDM) visible light communications (VLC) signal. The photodiode has a triple junction, and when it is illuminated by a WDM signal, the junctions produce inherently three photocurrents that are unusable for detecting any of the WDM signals. However, by means of linear MIMO processing, we are able to recover the transmitted signals exactly. Bit error rate measurements confirm the effectiveness of the proposed solution. This opens a new scenario for practical WDM-VLC systems.

中文翻译：

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通过具有MIMO处理的单个多色光电二极管检测WDM可见光信号。

据我们所知，这是我们第一次通过实验证明多输入多输出（MIMO）处理允许使用单个光电二极管同时检测波分复用（WDM）可见光通信（VLC）信号。光电二极管具有三重结，当被WDM信号照亮时，该结会固有地产生三个光电流，这些电流无法用于检测任何WDM信号。但是，通过线性MIMO处理，我们能够准确地恢复传输的信号。误码率测量结果证实了所提出解决方案的有效性。这为实际的WDM-VLC系统打开了一个新场景。