Available online at www.sciencedirect.com Physica A 330 (2003) 415–420 www.elsevier.com/locate/physa Stochastic resonance: numerical and experimental devices M.F. Carusela a , J. Codnia a; b , L. Romanelli a ; ∗ a Instituto de Ciencias, Univ. Nac. de General Sarmiento, Buenos Aires, Argentina b CEILAP (CITEFA-CONICET), Buenos Aires, Argentina Received 5 June 2003 Abstract An array of overdamped bistable oscillators with delay was studied numerically. Each site of the array is coupled directionally with the addition of white Gaussian noise. On the other hand, we compared the results with an array of coupled chain of experimental devices, also fed with Gaussian white noise. We observed for an optimal amount of noise and moderated coupling good transmission along the line without degradation. c  2003 Elsevier B.V. All rights reserved. PACS: 02.50.Ey; 0.5.40.+j Keywords: Stochastic resonance; Noise 1. Numerical device In the present work, we study numerically a one-dimensional chain of bistable oscil- lators operating in an overdamped regime and coupled unidirectionally. Assuming x n (t ) is the amplitude of the nth oscillator, n =0; 1;:::;N and V (x n ) be the usual double-well potential with minima of depth U 0 located at x = ±c [1]: Each oscillator is submitted to a driving force F dr n as dened in Eq. (1) being proportional to the amplitude of the preceeding oscillator in the chain with a xed delay  between one oscillator and the next one. The rst oscillator is instead assumed to be driven by a periodic external force. The delay time is taken of the order of the mean Kramers transition time [2], which is determined by the external noise intensity and the potential barrier height. ∗ Corresponding author. E-mail address: lili@ungs.edu.ar (L. Romanelli). 0378-4371/$-see front matter c  2003 Elsevier B.V. All rights reserved. doi:10.1016/j.physa.2003.09.003