提出了一种基于受激布里渊散射和耦合型双环的可调谐光电振荡器.该光电振荡器将受激布里渊散射和耦合型双环结构相结合, 利用受激布里渊散射的窄带增益谱选择振荡频率, 实现微波信号的频率可调谐.通过耦合型双环结构, 有效地抑制了微波信号的边模, 降低了微波信号的相位噪声, 提高了微波信号的频率和功率稳定性.实验结果表明, 该结构的光电振荡器可以产生2 GHz到18 GHz的微波信号, 边模抑制比优于60 dB, 相位噪声在10 kHz频偏处低于-95 dBc/Hz, 在实验室环境下10 GHz微波信号30 min内频率漂移小于0.3 ppm, 功率漂移低于0.2 dB.

A tunable Optoelectronic Oscillator (OEO) based on stimulated Brillouin Scattering (SBS) and Coupled Dual-Loop (CDL) is proposed. The OEO combines SBS and CDL. The narrow bandwidth gain spectrum of SBS is employed to select the oscillation frequency and realize frequency tunability. By the join of CDL, the side mode of the microwave signal is effectively suppressed, the phase noise of the microwave signal is decreased, the frequency and power stability of the microwave signal are improved. Experimental results show that microwave signals from 2 GHz to 18 GHz with the Side Mode Supression Ratio (SMSR) as high as 60 dB and the phase noise as low as -95 dBc/Hz at 10 kHz frequency offset are achieved. The frequency drift is less than 0.3 ppm and the power drift is lower than 0.2 dB at 10 GHz within 30 min in lab condition.