We investigate correlations of the intensity fluctuations of two-dimensional arrays of non-identical, locally-coupled lasers, numerically and experimentally. We find evidence of a power-law dependence of spatial correlations as a function of laser pair distance (or coupling strength) near the phase-locking threshold.
We study the effect of optical injection on the dynamical behavior of a laser whose frequency drifts randomly in time. When the autocorrelation time of these random ﬂuctuations is larger than the ty ical time scales of the system dynamics,and the range of the frequency drift is larger than the injection locking range,the laser
exhibits bursting behavior at irregular times,each burst being followed by relaxation oscillations towards the unlocked state. Numerical results from a simple model agree satisfactorily with the experimentally observed behavior of an injected fiber ring laser.
Encoding information in temporal chaotic signals and decoding it via chaotic synchronization between transmitter and receiver constitute nowadays a well-established technique. The method has been successfully implemented in electronic and optical systems. The latter, besides offering high speed of information transfer, provide a natural way of spatiotemporal communication through the use of broad chaotic optical wavefronts. An optical setup for spatiotemporal chaotic communications was recently proposed based on nonlinear ring cavities. In this article, we examine further in detail such a proposal, comparing two different encoding methods, namely injection and modulation. In the two cases, the correlation between input, transmitted, and output signals is estimated by means of measures taken from information theory. The influence of the message amplitude and parameter mismatch is analyzed.
The intensity fluctuations in the output of an intracavity doubled solid state laser have been shown to be deterministic in origin. We describe a simple technique to eliminate these fluctuations. Synchronized antiphase oscillations of the longitudinal mode intensities have been observed. Energy sharing between coupled modes is characterized by a statistical analysis of the chaotic fluctuations.