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Experimental observation of on-off intermittency in two mutually coupled semiconductor lasers

Alfredo Campos, Alexander Pisarchik
Intermittent switches between low-frequency fluctuations and stable emission are experimentally observed in two bidirectionally coupled semiconductor lasers subject to common Gaussian white noise applied to the laser pump currents. The time series analysis yields power-law scalings typical for on-off intermittency near its onset, with critical exponents of -1 and -3/2, respectively, for the mean turbulent length versus the noise intensity and probability distribution of the laminar phases versus the laminar length. The frequency spectrum analysis reveals a -1 power-law scaling for the signal-to-noise ratio versus the noise intensity.
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