Visible light communication (VLC) has drawn significant attention in recent years. Though high-speed visible-light sources have seen significant advances, commercially available photodetectors have low wavelength selectivity and modulation bandwidth in the near-violet-blue wavelengths, making them a bottleneck in VLC links. Here we show a record 7.4-Gbit/s visible-light communication link using a wavelength-selective, ( $\mathbf {20}\overline {21}$ )-oriented, semipolar InGaN/GaN multiple-quantum-well micro-photodetector ( $\mu $ PD) on GaN substrate. This is achieved by leveraging on the unique photodetection properties of semipolar $\mu $ PDs, combined with an optimized communication system utilizing bit- and power-loading schemes in orthogonal frequency-division multiplexing (OFDM) modulation over a 2-GHz bandwidth. We used a 405-nm violet laser diode transmitter as the responsivity of the $\mu $ PD was highest within the responsivity range of 360 - 420 nm. The investigation fully demonstrated the feasibility and favorable choice of semipolar InGaN/GaN $\mu $ PDs for multi-Gbit/s optical wireless communication.

中文翻译：

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利用波长选择性半极微光电探测器的 7.4-Gbit/s 可见光通信

近年来，可见光通信（VLC）引起了极大的关注。尽管高速可见光源取得了重大进展，但商用光电探测器在近紫蓝色波长中的波长选择性和调制带宽较低，这使其成为 VLC 链路的瓶颈。在这里，我们展示了使用波长选择性的创纪录的 7.4-Gbit/s 可见光通信链路，（ $\mathbf {20}\overline {21}$ ) 取向的半极性 InGaN/GaN 多量子阱微型光电探测器 ( $\亩 $ PD) 在 GaN 衬底上。这是通过利用半极性的独特光电探测特性来实现的 $\亩 $ PD 与优化的通信系统相结合，该系统在 2 GHz 带宽上利用正交频分复用 (OFDM) 调制中的比特和功率加载方案。我们使用 405 nm 紫色激光二极管发射器作为 $\亩 $ PD 在 360 - 420 nm 的响应范围内最高。调查充分证明了半极性 InGaN/GaN 的可行性和有利选择 $\亩 $ 用于多 Gbit/s 光无线通信的 PD。