Cai Wei, Zhu Bingcheng, Zhang Shuai, Qin Chuan, Jiang Yuan, Wang Xin, Zhang Fenghua, Wang Yongjin
Opt Express. 2019 Feb 4;27(3):3379-3389. doi: 10.1364/OE.27.003379.
The multiple-quantum-well diode (MQW-diode) inherently exhibits simultaneous behavior because of the overlap between the emission spectra and spectral responsivity of the MQW-diode. This feature makes it feasible to form a full-duplex light communication system when two identical MQW-diodes separately function as a transmitter and a receiver at the same time. To verify spatial full-duplex light communication, we fabricated and characterized a monolithic multicomponent system by integrating two InGaN waveguide-based MQW-diodes into a single chip. A 5-μm-wide air gap between two MQW-diodes was manufactured for precise alignment, which could yield spatial light transmission and coupling. Spatial co-time co-frequency full-duplex (CCFD) light communication was experimentally demonstrated using the monolithic multicomponent system, a self-interference cancellation scheme was used to extract the superimposed signals, and a full-duplex audio transmission experiment was performed, opening a promising route toward parallel information processing via free space based on the simultaneous light-emitting and light-detecting phenomenon of the MQW-diode.
多量子阱二极管（MQW 二极管）由于其发射光谱与光谱响应度之间的重叠，固有地表现出同时性行为。当两个相同的 MQW 二极管同时分别用作发射器和接收器时，这一特性使得形成全双工光通信系统成为可能。为了验证空间全双工光通信，我们通过将两个基于 InGaN 波导的 MQW 二极管集成到单个芯片中，制造并表征了一个单片多组件系统。在两个 MQW 二极管之间制造了一个 5μm 宽的气隙用于精确对准，这可以实现空间光传输和耦合。使用该单片多组件系统通过实验证明了空间共时共频全双工（CCFD）光通信，采用了一种自干扰消除方案来提取叠加信号，并进行了全双工音频传输实验，基于 MQW 二极管的同时发光和光检测现象，为通过自由空间进行并行信息处理开辟了一条有前景的途径。
