Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Colom 11, 08222 Terrassa, Barcelona, Spain.
Philos Trans A Math Phys Eng Sci. 2010 Jan 28;368(1911):367-77. doi: 10.1098/rsta.2009.0241.
We quantify the level of stochasticity in the dynamics of two mutually coupled semiconductor lasers. Specifically, we concentrate on a regime in which the lasers synchronize their dynamics with a non-zero lag time, and the leader and laggard roles alternate irregularly between the lasers. We analyse this switching dynamics in terms of the number of forbidden patterns of the alternate time series. The results reveal that the system operates in a stochastic regime, with the level of stochasticity decreasing as the lasers are pumped further away from their lasing threshold. This behaviour is similar to that exhibited by a single semiconductor laser subject to external optical feedback, as its dynamics shifts from the regime of low-frequency fluctuations to coherence collapse.
我们量化了两个相互耦合的半导体激光器动力学中的随机水平。具体来说，我们专注于这样一个区域，在这个区域中，激光器以非零的滞后时间同步它们的动力学，并且领导者和落后者的角色在激光器之间不规则地交替。我们根据交替时间序列的禁止模式的数量来分析这种切换动力学。结果表明，系统以随机状态运行，随着激光器从激光阈值泵浦得更远，随机水平降低。这种行为类似于受外部光学反馈的单个半导体激光器所表现出的行为，因为它的动力学从低频波动状态转移到相干崩溃。
