光反馈半导体激光器相干崩溃跃迁的实验研究
Experimental characterization of the transition to coherence collapse in a semiconductor laser with optical feedback
摘要：
具有延迟光反馈的半导体激光器具有广泛的动力学特性，并有着广泛的实际应用。它们还为表征复杂信号的数据分析工具提供了出色的测试平台。最近，我们中的一些人分析了实验强度的时间轨迹，并定量地确定了不同的动力学制度的发病，随着激光器的电流增加。具体来说，我们确定了低频波动（LFF）的开始，其中激光强度显示突然的辍学，和相干崩溃（CC）的开始，其中强度波动是非常不规则的。在这里，我们映射这些制度时，激光器电流和反馈强度变化。我们表明，强度波动的分布的形状（特征在于标准差，偏度和峰度）允许区分噪声，LFF和CC，并定量确定（尽管过渡的渐进性质）的三个制度的边界。有序分析的辍学间的时间间隔一致地识别三个政权发生在相同的参数区域的强度分布的分析。著名的时间延迟的Lang-Kobayashi模型的模拟是在很好的定性协议与观测。
英文摘要：
Semiconductor lasers with time-delayed optical feedback display a wide range of dynamical regimes, which have found various practical applications. They also provide excellent testbeds for data analysis tools for characterizing complex signals. Recently, several of us have analyzed experimental intensity time-traces and quantitatively identified the onset of different dynamical regimes, as the laser's current increases. Specifically, we identified the onset of low-frequency fluctuations (LFFs), where the laser intensity displays abrupt dropouts, and the onset of coherence collapse (CC), where the intensity fluctuations are highly irregular. Here we map these regimes when both, the laser current and the feedback strength vary. We show that the shape of the distribution of intensity fluctuations (characterized by the standard deviation, the skewness, and the kurtosis) allows to distinguish between noise, LFFs, and CC, and to quantitatively determine (in spite of the gradual nature of the transitions) the boundaries of the three regimes. Ordinal analysis of the inter-dropout time intervals consistently identifies the three regimes occurring in the same parameter regions as the analysis of the intensity distribution. Simulations of the well-known time-delayed Lang-Kobayashi model are in good qualitative agreement with the observations.
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