Optoelectronic nonlinear transient computing with multiple delays

In this contribution, we report on a versatile electro-optic setup performing photonic nonlinear transient computing. The setup is making use of a hybrid analogue and digital architecture. A photonic part is ruling the dynamics, with a tunable nonlinear transformation performed by the operating point of a Mach-Zehnder modulator. An FPGA (Field Programmable Gate Array) is also used to emulate the delay (usually achieved via the time of flight of the light information in a fiber), but also to emulate other specific and easily reconfigurable functionalities. The FPGA indeed allowed to design a multiple delayed feedback architecture, thus improving the connectivity of the virtual network of nodes emulated by the delay dynamics. We also implemented in-line processing features, such as the Readout processing which is usually performed off-line in most of the previous results.