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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1km时,产生的9GHz倍频信号相位噪声在10kHz频率偏移时达到-104dBc/Hz,比典型光电振荡环路恶化了6dB,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 method of using the non-linear effect of electro-optic modulator to realize the frequency-doubling output of the photoelectric oscillator is proposed. By introducing a microwave divider into the electro-optical oscillation loop, it is possible to use the low-frequency electro-optic modulator to generate high frequency microwave Frequency signal output, thereby reducing the oscillation frequency of the modulator operating frequency requirements. Theoretical and experimental studies show that when the input power of the microwave signal is low, the modulator will introduce larger additional noise, which will seriously deteriorate the phase noise of the frequency-doubling microwave signal output by the optical oscillator. By adding a microwave amplifier in the oscillation feedback loop to reduce the additional noise, the phase noise of the multiplied signal can be greatly improved. When the loop optical fiber is 1km, the generated 9GHz multiplied signal phase noise reaches -104dBc / Hz at a frequency shift of 10kHz, which is 6dB worse than that of the typical optical oscillation loop, while maintaining a high output power. The experimental results are basically consistent with the theoretical analysis, which proves the feasibility of the frequency-doubled output optical oscillator.