Author Affiliations
Abstract
1 Institute of Information Science, Beijing Jiaotong University, Beijing 100044, China
2 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China
3 Institute of Optical Information, Beijing Jiaotong University, Beijing 100044, China
We present a theoretical analysis and an experimental study of the impacts of external optical feedback on dual-frequency fiber lasers. The external optical feedback can effectively suppress the phase noise of the beat notes of dual-frequency fiber lasers, provided some requirements are satisfied. The polarization of the optical feedback is important for the fiber laser’s stability, and it can also tune the beat note frequency. A side effect of external optical feedback, as demonstrated in the experiments, is lowering the sensitivity of the dual-frequency fiber laser-based sensors, although such degradation is not obvious.
060.2370 Fiber optics sensors 140.3425 Laser stabilization Chinese Optics Letters
2017, 15(7): 070604
1 暨南大学光子技术研究院， 广东 广州 510632
2 北京交通大学计算机与信息技术学院信息科学研究所， 北京 100044
以光纤光栅作为反射镜，将双偏振光纤激光器的一小部分输出光经光纤延迟线延迟后再反馈回激光腔,降低了拍频信号的相位噪声。结果表明：反馈时间越长，噪声降低的幅度越大。以50 m长的单模光纤作为延迟线，降低了双偏振光纤光栅激光器拍频信号20 dB以上的相位噪声，在10 kHz偏移处相位噪声达到-92 dBc/Hz的水平；光反馈的偏振态对外部光反馈系统的噪声抑制能力有影响，并对双偏振光纤激光器的拍频频率有微弱的调谐能力。
激光器 双偏振光纤激光器 相位噪声 降噪
