Photonic Frequency Measurement and Signal Separation for Pulsed/CW Microwave Signals
Photonic Frequency Measurement and Signal Separation for Pulsed/CW Microwave Signals
复制标题
DOI：
10.1109/lpt.2013.2238920
复制
发表时间：
2013-03
影响因子：
2.6
通讯作者：
B. Lu;W. Pan;X. Zou;B. Luo;Lian-shan Yan;Xinkai Liu;S. Xiang
中科院分区：
文献类型：
--
作者：
B. Lu;W. Pan;X. Zou;B. Luo;Lian-shan Yan;Xinkai Liu;S. Xiang
提出了一种新颖的光子方法，可以同时实现脉冲和连续波 (CW) 微波信号的频率测量和信号分离，并进行了实验演示。在这种方法中，光波通过待测量的脉冲或连续波微波信号抑制载波进行外部调制，然后发送到两个光学互补滤波器以执行频率到幅度映射。两个滤波器的输出由低速光电探测器、低频交流（AC）电子元件和产生的直流（DC）电子元件检测。通过监测交流分量的功率可以估计脉冲微波信号的载波频率，而连续波微波信号的频率则与直流分量的功率进行区分，同时实现频率测量和信号分离。在概念验证实验中，在 5 至 20 GHz 频率范围内，脉冲重复频率为 0.25、0.5 或 1 MHz 的脉冲信号的测量误差小于 ±0.1、±0.11 或 ±0.13 GHz，而 CW 信号的测量误差小于 ±0.08 GHz。
A novel photonic approach to simultaneously implement frequency measurement and signal separation is proposed and experimentally demonstrated for pulsed and continuous-wave (CW) microwave signals. In this approach, a light wave is externally modulated with carrier suppressed by a pulsed or CW microwave signal to be measured, and then sent to two optical complementary filters to perform frequency-to-amplitude mapping. The outputs of the two filters are detected by low-speed photodetectors, low-frequency alternating currency (AC) electronic component and direct current (DC) one being generated. The carrier frequency of the pulsed microwave signal can be estimated by monitoring the power of the AC component, while the frequency of the CW microwave signal is discriminated from the power of the DC component, with the frequency measurement and the signal separation simultaneously realized. In proof-of-concept experiments, within the frequency range from 5 to 20 GHz, measurement errors less than ±0.1, ±0.11 , or ±0.13 GHz are achieved for a pulsed signal with pulse repetition frequency of 0.25, 0.5, or 1 MHz, whereas the errors less than ±0.08 GHz are derived for a CW signal.