Li Zhi, Li Yicong, Zang Zihan, Han Yaqi, Wu Lican, Li Mutong, Li Qian, Fu H Y
Opt Express. 2022 Jun 6;30(12):20796-20808. doi: 10.1364/OE.454266.
By using narrow infrared (IR) optical beams, optical wireless communication (OWC) system can realize ultra-high capacity and high-privacy data transmission. However, due to the point-to-point connection approach, a high accuracy localization system and beam-steering antenna (BSA) are required to steer the signal beam to user terminals. In this paper, we proposed an indoor beam-steering IR OWC system with high accuracy and calibration-free localization ability by employing a coaxial frequency modulated continuous wave (FMCW) light detection and ranging (LiDAR) system. In the meantime, benefitting from the mm-level ranging accuracy of the LiDAR system, a useful approach to assess the feasibility of the link alignment between beam-steering antenna and users is first demonstrated. With the assistance of the LiDAR system, we experimentally achieved the localization of user terminals with a 0.038-degree localization accuracy and on-off keying (OOK) downlink error-free transmission of 17 Gb/s in free space at a 3-m distance is demonstrated. The highest transmission data rate under the forward error correction (FEC) criterion (Bit error rate (BER) <3.8×10) can reach 24 Gb/s.
通过使用窄红外（IR）光束，光无线通信（OWC）系统可以实现超高容量和高保密性的数据传输。然而，由于点对点连接方式，需要高精度定位系统和波束转向天线（BSA）将信号波束导向用户终端。在本文中，我们提出了一种室内波束转向红外OWC系统，该系统通过采用同轴调频连续波（FMCW）光探测和测距（LiDAR）系统，具有高精度和免校准定位能力。同时，受益于LiDAR系统毫米级的测距精度，首次展示了一种评估波束转向天线与用户之间链路对准可行性的有效方法。在LiDAR系统的辅助下，我们通过实验实现了用户终端的定位，定位精度为0.038度，并在3米距离的自由空间中演示了17 Gb/s的开关键控（OOK）下行无差错传输。在前向纠错（FEC）标准（误码率（BER）<3.8×10）下的最高传输数据速率可达24 Gb/s。
