Photonic-assisted multiple microwave frequency measurement with improved robustness

作者：Guodong Wang, Qingqing Meng, Yong Jun Li, Xuan Li, Yixiao Zhou, Zihang Zhu, Congrui Gao, Li He, Shanghong Zhao · 发表于：Optics Letters · 年份：2023 · DOI：10.1364/ol.483392 · 被引用次数：23 · 研究领域：Advanced Photonic Communication Systems、Advanced Fiber Laser Technologies、Advanced Fiber Optic Sensors

A multiple microwave frequency measurement approach based on frequency-to-time mapping (FTTM) is reported. The FTTM is constructed by optical sideband sweeping and electric-domain intermediate frequency envelope monitoring. Two optimized operations are implemented. First, the use of balanced photodetection cancels out the beat components generated by the signals under test (SUT) themselves, so as to exclude frequency misjudgment. Second, a reference signal is introduced to map the SUT frequency to a relative time difference instead of an absolute time value, avoiding the measuring bias caused by time synchronization. As a result, the proposed scheme with improved robustness could be attractive for future practical applications. An experiment is performed. Microwave frequency measurement from 16 to 26 GHz is demonstrated, with an average error of 7.53 MHz.