Figure 1 : Reservoir computing concept and experimental scheme.

From: Parallel photonic information processing at gigabyte per second data rates using transient states

Figure 1

(a) Schematic representation of computation using nonlinear transient states generated by a single nonlinear element (NL) subject to delayed feedback. The N transient states xm(t) used for computation are distributed along the delay line with spacing Θ. Here, u stands for the information input, yk(t) for the value of the readout with index k. Panel (b) schematically shows the experimental realization of all-optical computation, utilizing a semiconductor laser diode as the nonlinear node. Information can be injected optically (electrically), given by u(o) (u(e)). The feedback delay is given by τD. The experimental setup comprises the laser diode, a tunable laser source to optically inject the information, a Mach–Zehnder modulator (MZM), a polarization controller, an attenuator, a circulator, splitters and a fast photo diode (PD) for signal detection.