Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 15, Pages 3298-3301Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3298
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Experimental evidence of coherence resonance in an optical system is reported. We shaw that the regularity of the excitable pulses in the intensity of a laser diode with optical feedback increases when adding noise, up to an optimal value of the noise strength. Both phase and amplitude fluctuations of the pulses play a relevant role in the dynamics of the system. We introduce the joint entropy of the two variables to generalize the indicator of coherence, and we put in evidence the mechanism of destruction of the excitable orbit after the resonance.
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