【摘要】 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。更多还原

【Abstract】 Optical pulse trains from mode-locked lasers carry low-jitter microwave signals.High-quality microwave signal could be obtained by using a band-pass filter.A regeneratively mode-locked fiber laser is used as an oscillation source to generate high-quality microwave signal.The phase-locked technology and cavity length control guarantee the stability of the system.The cost of the system is dramatically reduced by using the structure of "single-mode fiber+Farady rotator mirror" instead of polarization-maintaining structure.A semiconductor optical amplifier(SOA) is introduced into the optical microwave loop,which improves the side-mode suppression ratio effectively.The generated 20 GHz microwave signal has great performance with phase noise of-98 dBc/Hz at 10 kHz and line-width less than 5 Hz.The frequency stability is better than 1×10-10 within 10 h observation.更多还原