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Experimental evidence of coherence resonance in an optical system

Giacomelli, G.; Giudici, M.; Balle, S.; Tredicce, J. R.
Physical Review Letters 84, 3298-3301 (2000)

Experimental evidence of {it Coherence Resonance} in an optical system is reported.
We show 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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