Tao Jin, You Quan, Yang Chao, Li Zile, Deng Liangui, Wu Mian, Luo Ming, Wu Lin, Li Chao, Liu Zichen, He Zhixue, Xiao Xi, Zheng Guoxing, Yu Shaohua
State Key Laboratory of Optical Communication Technologies and Networks, China Information Communication Technologies Group Corporation (CICT), Wuhan 430074, China.
Peng Cheng Laboratory (PCL), Shenzhen 518055, China.
Nanophotonics. 2023 Jul 17;12(17):3511-3518. doi: 10.1515/nanoph-2023-0352. eCollection 2023 Aug.
The metasurface based beam-steering devices with the advantages of large steering angles, arbitrary channels and ultra-compactness have played an important role for data allocation and exchange in the optical wireless communication. However, the current metasurface based optical wireless communication systems are mainly on intensity modulation and direct detection (IM/DD), which shows a relative lower transmission capacity, lower received optical signal-to-noise ratio (OSNR) and complexity of system. In this study, a bidirectional multichannel optical wireless system enabled by a polarization independent metasurface with coherent modulation and reception is designed and experimentally demonstrated, which exhibits exclusive 100 Gbps coherent optical signals to multiusers with their own wavelengths, 2 m free space distance and field of view of 20° × 20°. In addition, the proposed system can support optical broadcasting system with capacity of 900 Gbps. The demonstrated metasurface assisted optical wireless communication system merges the optical coherent communication techniques and emerging concept of metasurface, which reduces the complexity and cost of the system while contributing a high transmission capacity, opening a new avenue for high performance optical wireless communications.
基于超表面的光束转向器件具有大转向角、任意通道和超紧凑等优点，在光无线通信中的数据分配和交换方面发挥了重要作用。然而，当前基于超表面的光无线通信系统主要采用强度调制和直接检测（IM/DD）方式，其传输容量相对较低，接收光信噪比（OSNR）较低，且系统复杂。在本研究中，设计并通过实验演示了一种由具有相干调制和接收功能的偏振无关超表面实现的双向多通道光无线系统，该系统能够以各自的波长向多用户独家提供100 Gbps的相干光信号，自由空间距离为2 m，视场为20°×20°。此外，所提出的系统能够支持容量为900 Gbps的光广播系统。所演示的超表面辅助光无线通信系统融合了光相干通信技术和超表面这一新兴概念，在降低系统复杂性和成本的同时，实现了高传输容量，为高性能光无线通信开辟了一条新途径。
