Zhang Yunhao, Xiao Shilin, Yu Yinghong, Chen Cao, Bi Meihua, Liu Ling, Zhang Lu, Hu Weisheng
Opt Express. 2016 Dec 26;24(26):30139-30148. doi: 10.1364/OE.24.030139.
In this paper, we experimentally demonstrate and study a wideband in-band full-duplex (IBFD) wireless communication system based on optical self-interference cancellation (SIC). The optical SIC performances based on antennas for broadband IBFD are firstly evaluated within high frequency bands (> 10GHz). In this system, two electro-absorption-modulated lasers (EMLs) and a balanced photo-detector (BPD) are employed to remove the wideband self-interference within received wireless signal. By theoretical derivation and experimental verification, the impact factors of SIC are analyzed, especially for non-flatness wireless channel case. Experimental results show more than 30-dB cancellation depth in 100-MHz bandwidth with employment of horn antennas. Besides, IBFD transmission performance based on OFDM signals for different bandwidth with 11.15-GHz center frequency is also demonstrated, and ~52.2- dB•Hz spurious-free dynamic range (SFDR) is obtained.
在本文中，我们通过实验演示并研究了一种基于光学自干扰消除（SIC）的宽带带内全双工（IBFD）无线通信系统。首先在高频频段（>10GHz）内评估了基于天线的宽带IBFD的光学SIC性能。在该系统中，采用了两个电吸收调制激光器（EML）和一个平衡光电探测器（BPD）来消除接收无线信号中的宽带自干扰。通过理论推导和实验验证，分析了SIC的影响因素，特别是对于非平坦无线信道的情况。实验结果表明，使用喇叭天线时，在100MHz带宽内的抵消深度超过30dB。此外，还展示了基于中心频率为11.15GHz的不同带宽的OFDM信号的IBFD传输性能，并获得了约52.2dB•Hz的无杂散动态范围（SFDR）。
