Opt Lett. 2023 Jun 1;48(11):3107-3110. doi: 10.1364/OL.492859.
In this Letter, we explore the potential of the application of clock data recovery for the implementation of real-time optical wireless communications (OWCs) employing orbital angular momentum (OAM)-based mode division multiplexing (MDM). We experimentally demonstrate a 3-mode multiplexed optical wireless link with a sum rate of 60 Gbps, in which the time synchronization of different channels is realized by the proposed modified digital feedback clock recovery based on the Gardner algorithm. The experimental results show that high-precision channel synchronization with a low timing error can be achieved, and the bit-error rate of all channels can drop below 7% of the hard-decision forward error correction (HD-FEC) limit of 3.8 × 10, which indicates that clock data recovery can potentially provide the implementation of real-time OWCs using OAM-based MDM.
在这封信件中，我们探讨了应用时钟数据恢复来实现基于轨道角动量 (OAM) 的模式复用 (MDM) 的实时光无线通信 (OWC) 的可能性。我们通过基于 Gardner 算法的改进数字反馈时钟恢复，实验演示了一个 3 模式复用的光无线链路，其总速率为 60 Gbps，其中不同信道的时间同步是通过所提出的方案实现的。实验结果表明，可以实现高精度的信道同步和低定时误差，并且所有信道的误码率都可以降至 7%以下，这低于硬判决前向纠错 (HD-FEC) 限 3.8×10，这表明时钟数据恢复有可能为基于 OAM 的 MDM 的实时 OWC 提供实现。
