Shen Jian, Wu Shibao, Li Dan, Liu Jia
Appl Opt. 2019 Oct 10;58(29):8101-8107. doi: 10.1364/AO.58.008101.
A new method, to the best of our knowledge, to measure frequencies of received microwave signal based on an optical frequency comb (OFC) and a photonic multi-channel receiver is proposed and simulated. The measurement system mainly includes a seed laser, an OFC generator composed of two cascaded Mach-Zehnder modulators, a frequency shifter, an intensity modulator, a wavelength-division demultiplexer, photodiodes (PDs), and electrical filters. Two sets of beat signals need to be obtained in the measurement process. By analyzing the two sets of beat signals, multiple frequency components of the microwave signal can be measured at a time. The validity of the proposed scheme is verified by VPI simulation software. It is shown that microwave frequencies within dozens of gigahertz can be precisely measured, and factors affecting the frequency measurement range are also studied.
据我们所知，提出并仿真了一种基于光学频率梳（OFC）和光子多通道接收器来测量接收微波信号频率的新方法。该测量系统主要包括种子激光器、由两个级联马赫-曾德尔调制器组成的OFC发生器、移频器、强度调制器、波分复用器、光电二极管（PD）和电滤波器。在测量过程中需要获得两组拍频信号。通过分析这两组拍频信号，可以一次性测量微波信号的多个频率分量。利用VPI仿真软件验证了所提方案的有效性。结果表明，可以精确测量几十吉赫兹范围内的微波频率，并且还研究了影响频率测量范围的因素。
