光反馈干涉系统反馈水平因子的实时测量算法

摘要

基于Lang-Kobayashi方程研究了光反馈干涉信号的特征点,利用这些特征点采用相位解卷方法得出了重构光反馈相位(φF用表示)的计算公式,并仿真验证了该方法,结果表明该方法重构φF的剩余误差精度为10-9 rad.在此基础上研究了无光反馈时系统的光相位(φ0用表示)与光反馈水平因子之间的关系,当预置的光反馈水平因子的大小越接近实际的光反馈水平程度时,φ0的一次微分信号幅值就越小,进而设计了光反馈水平因子的实时测量算法.最后在三种光反馈强度下通过仿真验证该算法,结果表明用该算法测量得到的反馈水平因子精确度可达到98.77％.%Feature points of the optical feedback interference signal are analyzed based on the Lang-Kobayashi equation. Reconstruction method of the light phase with external optical feedback (denoted by φF) is presented based on phase unwrapping,The proposed approach has been verified by numerical simulations. The results indicate that the residual error is 10 -9 rad by applying this method to reconstruct φF. Based on the above researches, the relationship between the light phase without external optical feedback (denoted by φ0 ) and the feedback strength factor (denoted by C) has been studied. It finds that the closer the preset C is to the true value of C,φ0the smaller the magnitude of the differential signal of the will be. That helps to design the real-time measurement algorithm of C. Finally,computer simulations have also been carried out to verify the proposed algorithm under three different feedback levels ,showing that C can be determined with an accuracy of 98.77%.