Excitability in optical systems close to Z₂-symmetry

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• 作者：Stefano Beri ; Lilia Mashall ; Lendert Gelens ; Guy Van der S ; e ; Gabor Mezosi ; Marc Sorel ; Jan Danckaert ; Guy Verschaffelt
• 关键词：Semiconductor ring laser ; Excitability ; Fluctuations ; Nonlinear dynamics ; Stochastic dynamics
• 刊名：Physics Letters A
• 出版年：2010
• 出版时间：18 January 2010
• 年：2010
• 卷：374
• 期：5
• 页码：739-743
• 全文大小：584 K

文摘

We report theoretically and experimentally on excitability in semiconductor ring lasers in order to reveal a mechanism of excitability, general for systems close to Z₂-symmetry. The global shapes of the invariant manifolds of a saddle in the vicinity of a homoclinic loop determine the origin of excitability and the features of the excitable pulses. We show how to experimentally make a semiconductor ring laser excitable by breaking the Z₂-symmetry in a controlled way. The experiments confirm the theoretical predictions.