A method of generating double frequency microwave signal is experimentally investigated in this paper. The double frequency microwave signal generator is constructed by a CW laser, biased Mach-Zehnder modulator （MZM） and a photo-detector. The double frequency signal is obtained, by Adjusting the biased voltage applied on the MZM to generate the even-order harmonic components of modulating signal, and changing the amplitude of modulating signal to restrain the higher even-order harmonic components. A double frequency signal at 8-GHz is got in experiments. Both the experiment results and the simulation results demonstrate that our method is feasible. The comparison between simulation results and experiment results also indicates that using higher modulation rate and lower noise Mach-Zehnder modulator can improve the waveform quality and the signal frequency of the doubled frequency signals.%通过实验研究了一种采用光学方法产生微波倍频信号的方法．利用连续激光光源、偏置M—Z调制器和探测器构成了微波倍频信号发生器．控制M—Z调制器偏置点来获得偶数阶谐波分量，调节调制信号幅度来抑制偶数阶分量信号的高阶谐波成分，从而产生调制信号的2倍频信号．实验获得了8GHz的微波倍频信号．仿真和实验证明了本方法的可行性．仿真和实验结果的比较说明，采用高速、低噪声的M—Z调制器可以进一步提高微波倍频信号的频率和波形质量．
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