Dat Pham Tien, Umezawa Toshimasa, Kanno Atsushi, Yamamoto Naokatsu, Kawanishi Tetsuya
Opt Lett. 2022 Mar 1;47(5):1149-1152. doi: 10.1364/OL.452987.
This Letter describes a high-speed yet simple fiber-wireless-fiber system in the 100-GHz band using a photonics-enabled receiver and optical phase modulator. At the antenna site, a millimeter-wave signal is down-converted to the microwave band using an electronic mixer with a local oscillator signal generated remotely using photonic technology. The down-converted signal is converted to an optical signal using an optical phase modulator. At the receiver, a simple direct detection of the phase-modulated signal is performed using optical filtering technology. To demonstrate the proof-of-concept, we successfully transmitted a 64-quadrature amplitude modulation orthogonal frequency-division multiplexing signal with a record line rate of 80 Gb/s (net data rate of 55 Gb/s) over a system consisting of two radio-over-fiber links and a 5 m wireless link in the 100-GHz band. The proposed system with simple antenna sites and optical transceivers can facilitate the deployment of ultra-dense small cells in high-frequency bands in beyond-5G networks.
本文描述了一种在100吉赫兹频段的高速且简单的光纤-无线-光纤系统，该系统使用了具备光子学功能的接收器和光相位调制器。在天线端，毫米波信号通过电子混频器下变频至微波频段，其中本地振荡器信号利用光子技术远程生成。下变频后的信号通过光相位调制器转换为光信号。在接收器端，利用光学滤波技术对相位调制信号进行简单的直接检测。为了验证概念，我们在一个由两条光纤无线链路和一条100吉赫兹频段的5米无线链路组成的系统上，成功传输了一个64正交幅度调制正交频分复用信号，其记录线速率为80吉比特每秒（净数据速率为55吉比特每秒）。所提出的具有简单天线端和光收发器的系统能够促进超密集小基站在5G以上网络的高频段中的部署。
