提出了一种利用电光调制器的非线性效应实现光电振荡器倍频输出的方法，通过在光电振荡环路中引入微波分频器，使得利用低频率的电光调制器有可能产生高频率的微波倍频信号输出，从而降低了振荡频率对调制器工作频率的要求。理论和实验研究表明，在微波信号输入功率较低时，调制器将引入较大的附加噪声，会严重恶化光电振荡器输出的倍频微波信号的相位噪声。通过在振荡反馈环路中增加一个微波放大器，减小附加噪声，能够极大地改善倍频信号的相位噪声。当环路光纤为1 km时，产生的9 GHz倍频信号相位噪声在10 kHz频率偏移时达到-104 dBc/Hz，比典型光电振荡环路恶化了6 dB，同时，保持了较高的输出功率。实验结果与理论分析基本一致，证明了该倍频输出光电振荡器的可行性。

A frequency-doubling optoelectronic oscillator using the nonlinear effect of the electro-optical modulator is proposed. By introducing a frequency divider, it is possible to produce frequency-doubling microwave signal with high frequency using low frequency modulator. Therefore, the requirement for high frequency modulator is weakened. Theoretical and experimental results show that, when the input microwave power is low, the modulator can introduce large additional noise, which severely deteriorates the phase noise of the optoelectronic oscillator. By introducing another microwave amplifier in the feedback path to reduce the additional noise, the phase noise of the frequency-doubling signal can be largely improved. When the fiber length is 1 km, the phase noise of the frequency-doubling signal is -104 dBc/Hz at 10 kHz frequency offset from 9 GHz, which is 6 dB worse than the conventional optoelectronic oscillator. Meanwhile, the output power is remained. The agreement of experimental results and theoretical analysis justifies the feasibility of this method.