Wei Zixian, Zhang Shi, Mao Simei, Wang Lei, Zhang Li, Chen Chien-Ju, Wu Meng-Chyi, Dong Yuhan, Wang Lai, Luo Yi, Fu H Y
Opt Express. 2021 Feb 1;29(3):3891-3903. doi: 10.1364/OE.412348.
We built a full-duplex high-speed optical wireless communication (OWC) system based on high-bandwidth micro-size devices, for which micro-LED and VCSEL arrays are implemented to establish downlink and uplink, respectively. The high-capacity downlink based on a single-pixel quantum dot (QD) micro-LED can reach a data rate of 2.74 Gbps with adaptive orthogonal frequency division multiplexing (OFDM). VCSEL-based line-of-sight (LOS) and non-line-of-sight (NLOS) uplinks are designed with lens-free receiving functions for a 2.2-m communication distance. Experimental results have been demonstrated and confirmed that both downlink and uplinks are capable of providing sufficient bandwidth for a multi-gigabit OWC. Besides, the lens-free uplink receiver can alleviate requirements for aligning and improve the mobility of the transmitter. The VCSELs implemented for both systems work with low driving currents of 140-mA and 190-mA under consideration of the human eye safety. For non-return-to-zero on-off keying (NRZ-OOK), both uplinks can achieve 2.125 Gbps with bit-error-rate (BER) lower than the forward error correction (FEC) threshold of 3.8×10 for Ethernet access.
我们基于高带宽微型设备构建了一个全双工高速光无线通信（OWC）系统，为此分别采用了微发光二极管（micro-LED）和垂直腔面发射激光器（VCSEL）阵列来建立下行链路和上行链路。基于单像素量子点（QD）微发光二极管的高容量下行链路，通过自适应正交频分复用（OFDM）可实现2.74 Gbps的数据速率。基于VCSEL的视距（LOS）和非视距（NLOS）上行链路针对2.2米的通信距离设计了无透镜接收功能。实验结果表明并证实，下行链路和上行链路都能够为多千兆位光无线通信提供足够的带宽。此外，无透镜上行链路接收器可以减轻对准要求并提高发射器的移动性。考虑到人眼安全，为两个系统实现的VCSEL在140 mA和190 mA的低驱动电流下工作。对于非归零开关键控（NRZ-OOK），两个上行链路均可实现2.125 Gbps，误码率（BER）低于以太网接入的前向纠错（FEC）阈值3.8×10 。
