title: Vibrational resonance and the detection of aperiodic binary signals.
abstract: We present the experimental and numerical study of a method for detecting aperiodic binary signals in a bistable, vertical cavity surface emitting laser (VCSEL). The method uses the phenomenon of vibrational resonance, in presence of a fixed level of noise. We show that the addition of a periodic signal with a period much shorter than the bit duration of the aperiodic input signal allows one to significantly increase the cross-correlation coefficient between the input and the output, as well as to substantially decrease the bit error rate. The experimental observation of a time lag between the input and the output of the VCSEL due the high-frequency modulation is reported. The effect of an asymmetry of the bistable quasipotential on the detection is also analyzed. The numerical results of simulations in a simple model are in qualitative agreement with the experiment.
authors.affiliation: B.I. Stepanov Institute of Physics, NASB, 220072 Minsk, Belarus. vnc@dragon.bas-net.by
authors.forename: V N
authors.initials: VN
authors.lastname: Chizhevsky
authors.forename: Giovanni
authors.initials: G
authors.lastname: Giacomelli