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针对已有方法在单频光纤激光器跳模检测中存在的不足,提出一种基于非平衡光纤Michelson干涉仪动态相移的跳模检测方法。使用干涉仪将激光器跳模时的光频突变转换为相位工作点的突变,并通过同步监测相位工作点的正余弦函数两路信号来跟踪与判断它的动态相移,成功实现了对超窄线宽掺铒光纤环形激光器偶发的随机跳模以及由开机瞬态热效应触发的连续多次跳模的测量与分析。结果表明,该方法检测灵敏度高,跳模判据实时直观,并能测量跳模前后可能发生的频漂,为评价单频光纤激光器的模式稳定能提供有效的测试手段。
Aiming at the shortcomings of existing methods in jumping mode detection of single frequency fiber laser, a jump mode detection method based on dynamic phase shift of unbalanced fiber Michelson interferometer is proposed. The interferometer is used to change the optical frequency abrupt change when the laser jumps mode to the abrupt change of the working point of the phase and to track and judge its dynamic phase shift by monitoring the sine and cosine functions of the phase operating point synchronously. Erbium-doped fiber ring lasers with a linewidth and the measurement and analysis of the continuous multi-hopping mode triggered by the transient thermal effect of power-on. The results show that the proposed method has high detection sensitivity, jump mode criteria can be visualized in real time and can measure the frequency drift before and after hopping. It provides an effective test method for evaluating the mode stability of single frequency fiber laser.