提出了一种基于电吸收调制激光器的双功能系统，可以同时实现微波信号的产生和其相位噪声的测量。该系统由基于电吸收调制激光器的光电振荡器模块和基于光延时线技术的相位噪声测量模块构成。通过使用单个电吸收调制激光器代替激光源和强度调制器，所提出的双功能系统不仅成本低廉、结构简单，而且性能表现优异；有利于在基于OEO的射频系统，特别是信号产生系统的研制、优化与工作过程中，及时评估信号源的质量并作出相应的参数调整以优化其性能，为光电振荡器的相位噪声测试提供了简单的解决方案。实验结果表明，由光电振荡器生成的9.952 GHz信号的边模抑制比为66 dB，相位噪声为-116.53 dBc/Hz@10 kHz。此外，相位噪声测量系统的相位噪声基底达-133.71 dBc/Hz@10 kHz，其测量灵敏度优于商用信号分析仪R&S FSV40。

We propose a photonic-assisted single system for measuring the frequency and phase noise of microwave signals in a large spectral range. Both the frequency and phase noise to be measured are extracted from the phase difference between the signal under testing and its replica delayed by a span of fiber and a variable optical delay line (VODL). The system calibration, frequency measurement, and phase noise measurement are performed by adjusting the VODL at different working modes. Accurate frequency and phase noise measurement for microwave signals in a large frequency range from 5 to 50 GHz is experimentally demonstrated.