An approach to the measurement of microwave frequency based on optical power monitoring
An approach to the measurement of microwave frequency based on optical power monitoring
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DOI：
10.1109/lpt.2008.926025
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发表时间：
2008-07-01
影响因子：
2.6
通讯作者：
Yao, Jianping
中科院分区：
文献类型：
--
作者：
Chi, Hao;Zou, Xihua;Yao, Jianping
提出并论证了一种基于光功率监测的微波频率测量新方法。将具有待测频率的微波信号调制在两个光载波上，其中光载波的波长设置在正弦滤波器的光谱响应的一个峰值和一个谷值处。该调制由被偏置以抑制光载波的Mach-Zehnder调制器执行。推导了两个波长通道的光功率与待测微波频率之间的数学表达式。通过简单地监测两个波长通道的输出处的光功率，可以评估微波频率。进行了概念验证实验。实现了对不同功率级微波信号的高精度频率测量。
A novel approach to the measurement of microwave frequency based on optical power monitoring is proposed and demonstrated. The microwave signal with its frequency to be measured is modulated on two optical carriers with their wavelengths set at one peak and one valley of the spectral response of a sinusoidal filter. The modulation is performed by a Mach-Zehnder modulator that is biased to suppress the optical carriers. A mathematical expression relating the optical powers from the two wavelength channels and the microwave frequency to be measured is developed. By simply monitoring the optical powers at the outputs of the two wavelength channels, the microwave frequency can be evaluated. A proof-of-concept experiment is implemented. Frequency measurement with good accuracy for microwave signals at different power levels is realized.