Chen Yang, Zhang Weifeng, Liu Jingxuan, Yao Jianping
Opt Lett. 2019 May 15;44(10):2402-2405. doi: 10.1364/OL.44.002402.
An on-chip two-step microwave frequency measurement method with high accuracy and an ultra-wide frequency measurement range is reported. A silicon photonic integrated micro-disk resonator (MDR) array is used to coarsely measure the signal frequency via an array of add-drop MDRs with smaller disk radii; then an MDR with a larger radius is used to finely measure the signal frequency, which is done by monitoring the optical powers of the optical signals from the through port and drop port of the MDRs. The proposed system features a very compact structure, ultra-wide frequency measurement range, and high frequency measurement accuracy, which is verified by a proof-of-concept experiment using two MDRs with radii of 6 and 10 μm. A frequency measurement of microwave signals from 1.6 to 40 GHz is implemented with a measurement error of less than 60 MHz. The stability of the system is also evaluated.
报道了一种具有高精度和超宽频率测量范围的片上两步微波频率测量方法。采用硅光子集成微盘谐振器（MDR）阵列，通过一系列盘半径较小的分插复用MDR对信号频率进行粗测；然后使用一个半径较大的MDR对信号频率进行精测，这是通过监测来自MDR直通端口和下路端口的光信号的光功率来实现的。所提出的系统具有非常紧凑的结构、超宽的频率测量范围和高频率测量精度，使用两个半径分别为6μm和10μm的MDR进行的概念验证实验验证了这一点。实现了对1.6至40GHz微波信号的频率测量，测量误差小于60MHz。还评估了系统的稳定性。
