为了有效实现光电振荡器(OEO)输出信号相位可调,提出了一种基于法拉第旋转镜的OEO。利用放大器和滤波器构成电增益环腔,电增益环腔、直接调制半导体激光器(DFB-LD)和光电检测器构成OEO环路。通过光分路器得到经过调制后的光信号,结合级联光环形器和法拉第旋转镜结构,改变级联法拉第旋转镜的个数,可以对应得到相位延迟90~360°的射频(RF)信号,在实验结构简单的条件下,有效实现了OEO输出信号的相位调谐。实验结果表明,每增加一组光环形器和法拉第旋转镜结构,输出的RF信号相位延迟90°。当光纤长为2km,电增益环腔长为0.5 m时,得到频率为10.8GHz、边模抑制比大于50dB和相位噪声为-104.8dBc/Hz@10kHz的RF信号。 In order to effectively adjust the phase of the output signal of the optoelectronic oscillator (OEO), an OEO based on a Faraday rotator is proposed. The amplifier and filter are used to form the electric gain ring cavity, the electric gain ring cavity, the direct modulation semiconductor laser (DFB-LD) and the photo detector to form the OEO loop. After the optical signal is obtained through the optical splitter, combined with the cascaded optical circulator and the Faraday rotating mirror structure, the number of cascaded Faraday rotating mirrors can be changed to obtain a radio frequency (RF) signal with a phase delay of 90 to 360 degrees Under the condition of simple experimental structure, the phase tuning of OEO output signal is effectively realized. Experimental results show that for each additional set of optical circulators and Faraday rotator structures, the output RF signal is delayed in phase by 90 °. When the fiber length is 2km and the cavity length of the electric gain ring is 0.5m, the RF signal with the frequency of 10.8GHz, the side mode rejection ratio greater than 50dB and the phase noise of -104.8dBc / Hz@10kHz is obtained.