针对传统半导体激光器阈值提取方法容易受噪声影响、存在重复性不好的问题,根据小波变换奇异性检测原理,提出一种采用小波变换的阈值电流提取法,其采用三阶样条函数的二倍膨胀作为光滑函数g(x),取它的二阶导数为小波函数ψ(x),并结合多尺度来对半导体激光器光功率-电流(L-I)信号中的奇异点和不规则突变点进行检测分析.实验结果表明,与传统的二段直线拟合法、一次微分法和二次微分法相比,小波提取法不受噪声影响,能够真实、准确地得到半导体激光器的阈值电流.
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