半导体激光器参数估计的改进算法

为了精确估计带外腔半导体激光器的线宽展宽因数，采用了光反馈自混合技术和梯度最优算法，可以达到数据—理论的最佳拟合，同时提出了改进的梯度迭代公式，并在参数迭代时引入可变步长，取得了仿真和实验数据，该算法不仅测量精度较高，而且抗噪声性能较好，仿真结果表明当信噪比大于20分贝时，线宽展宽因数的相对标准差小于2.55% ，实验数据处理结果表明线宽展宽因数的相对标准差小于5.1%，这对半导体激光器的应用是有帮助的。

An improved algorithm for estimating parameter of semiconductor laser

Abstract—For the sake of accurately estimating linewidth enhancement factor of semiconductor laser with external cavity, optical feedback self-mixing interferometric technology and gradient-based optimization algorithm are introduced, The method achieves best data-theoretical fitting. In addition, New iterate formula is presented and alterable step is introduced when parameters are updated. Simulation and experiment data is obtained. The accuracy of algorithm is higher and antinoise capability is better. The simulation result shows that the relative standard deviation of linewidth enhancement factor is less than 2.55% when Signal-to-Noise is 20 decibel. Experiment data result shows that the relative standard deviation of linewidth enhancement factor is less than 5.1% .