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采用再生锁模光纤激光器作为高质量微波源的振荡级,产生了高质量的微波信号。为了保证振荡环路的稳定性,采用了锁相技术和腔长控制;采用“单模光纤(SMF)+法拉第旋光镜(FRM)”的结构代替了全保偏光纤,在腔内存在偏振扰动的情况下保证了系统稳定并降低了系统成本;在光生微波环路中加入了半导体光放大器(SOA),有效地提高了边模抑制比。最后,获得了的相位噪声为-98dBc/Hz(@10kHz)、线宽小于5Hz的20GHz微波信号。在10h的观测时间内,频率漂移小于2Hz,频率长期稳定性优于1×10-10。
The use of regenerative mode-locked fiber laser as a high-quality microwave source oscillator level, resulting in high-quality microwave signal. In order to ensure the stability of the oscillation loop, the phase locking technique and cavity length control are adopted. The structure of “SMF + Faraday Rotator” (FRM) In the case of polarization disturbance, the stability of the system is ensured and the system cost is reduced. A semiconductor optical amplifier (SOA) is added into the photo-generated microwave loop, which effectively increases the side mode rejection ratio. Finally, the acquired phase noise is -98dBc / Hz (@ 10kHz) and the linewidth is less than 5Hz 20GHz microwave signal. In 10h observation time, the frequency drift is less than 2Hz, the long-term frequency stability is better than 1 × 10-10.