We investigate theoretically and experimentally the computational properties of an optoelectronic neuromorphic processor based on a complex nonlinear dynamics. This neuromorphic approach is based on a new paradigm of or reservoir computing, which is intrinsically different from the concept of Turing machines. It essentially consists in expanding the input information to be processed into a higher dimensional phase space, through the nonlinear transient response of a complex dynamics excited by the input information. The computed output is then extracted via a linear separation of the transient trajectory in the complex phase space, performed through a learning phase consisting of the resolution of a regression problem. We here investigate an architecture for photonic neuromorphic computing via these complex nonlinear dynamical transients. A versatile photonic nonlinear transient computer based on a multiple-delay is reported. Its hybrid analogue and digital architecture allows for an easy reconfiguration, and for direct implementation of in-line processing. Its computational efficiency in parameter space is also analyzed, and the computational performance of this system is successfully evaluated on a standard spoken digit recognition task. We then discuss the pathways that can lead to its effective integration.
Relaxation oscillation frequency is produced when a laser is operated in the low laser threshold current region. In this
operation region, a semiconductor laser shows a smooth curve, where we can observe uncertainty into defining the onset
of laser oscillation. Relaxation oscillations in the laser intensity can be seen as sidebands on both sides of the main laser
line. In this context, a communication system by using a relaxation oscillation frequency as an information carrier is
proposed in this paper. The experimental setup is based on operation principle of direct detection, where the obtained
microwave signal at the output of a fast photodetector is located on C band and it is modulated with an analog NTSC TV
signal.
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