Wang Jingjing, Chen Minghua, Liang Yunhua, Chen Hongwei, Yang Sigang, Xie Shizhong
Opt Express. 2015 Jan 26;23(2):839-45. doi: 10.1364/OE.23.000839.
We propose and demonstrate a novel RF front-end with broadened processing bandwidth, where a tunable microwave photonic filter based on optical frequency comb (OFC) is incorporated to accomplish simultaneous down-conversion and filtering. By designing additional phase shaping and time delay controlling, the frequency tunability of the system could be enhanced. More importantly, the beating interferences generated from broadband RF input could also be suppressed, which help to break the limitation on the processing bandwidth. In our experiments, a photonics RF receiver front-end for RF input with wide bandwidth of almost 20 GHz was realized using 10-GHz-space OFC, where the center frequency of the pass band signals could be tuned continuously.
我们提出并展示了一种具有拓宽处理带宽的新型射频前端，其中集成了基于光学频率梳（OFC）的可调谐微波光子滤波器，以实现同时下变频和滤波。通过设计额外的相位整形和时延控制，可以提高系统的频率可调性。更重要的是，还可以抑制宽带射频输入产生的拍频干扰，这有助于突破处理带宽的限制。在我们的实验中，使用10 GHz间隔的光学频率梳实现了一个用于带宽近20 GHz的射频输入的光子射频接收器前端，其中通带信号的中心频率可以连续调谐。
