Zhang Lu, Chen Zefeng, Zhang Hongqi, Yang Zuomin, Wu Yixin, Yu Xiongbin, Pang Xiaodan, Bobrovs Vjaceslavs, Ozolins Oskars, Yu Xianbin
Opt Lett. 2022 Sep 1;47(17):4307-4310. doi: 10.1364/OL.466080.
With the progress of high-capacity radio access networks, ultra-dense small cells are rapidly being deployed in urban areas. As a result, the deployment of a large number of optical fibers in urban areas becomes a severe issue. In this Letter, we propose a hybrid fiber-terahertz (THz) mobile fronthaul system supporting flexible and high-order wireless signal transmission with the delta-sigma modulation. The photonic THz transmission is used as the seamless extension of fiber-based fronthaul in small cells. A 20-Gbit/s digital fiber-THz fronthaul system is experimentally demonstrated to validate the proposed scheme, with 10-km optical fiber transmission and 300-GHz wireless relay. Carrier aggregation of up to 10 40-MHz and 60-MHz 5G-new radio (5G-NR) channels at the radio carrier frequency of 3.9 GHz is reported. The design of quantization noise suppressed delta-sigma modulation enables the system to transmit orthogonal frequency division multiplexing (OFDM) modulation up to 16384 order quadrate amplitude modulation (QAM) mapping with the error vector magnitude (EVM) below 0.5%.
随着高容量无线接入网络的发展，超密集小基站正在城市地区迅速部署。因此，在城市地区部署大量光纤成为一个严峻的问题。在本信函中，我们提出了一种混合光纤 - 太赫兹（THz）移动前传系统，该系统通过Delta - Sigma调制支持灵活且高阶的无线信号传输。光子太赫兹传输被用作小基站中基于光纤前传的无缝扩展。通过实验演示了一个20 Gbit/s的数字光纤 - 太赫兹前传系统来验证所提出的方案，该系统具有10公里的光纤传输和300 GHz的无线中继。报告了在3.9 GHz的无线电载波频率下高达10个40 MHz和60 MHz的5G新无线电（5G - NR）信道的载波聚合情况。量化噪声抑制Delta - Sigma调制的设计使该系统能够传输高达16384阶正交频分复用（OFDM）调制的正交幅度调制（QAM）映射，误差向量幅度（EVM）低于0.5%。
