title: Experimental evidence of coherence resonance in an optical system
abstract: Experimental evidence of 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.
authors.affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy.
authors.initials: G
authors.lastname: Giacomelli
authors.initials: M
authors.lastname: Giudici
authors.initials: S
authors.lastname: Balle
authors.initials: JR
authors.lastname: Tredicce