This paper describes the work on optical neural network-based IR target recognition. The experimental system consists of the fabricated optical synaptic device with two stacked layers, i.e., GaAs-LED and Si-PD, with the interconnection matrix patterned on the PD surface. The experiment for four patterns representing small moving targets shows basically satisfactory results.
"Optical-neural-network-based IR system for small moving targets", Proc. SPIE 1701, Optical Pattern Recognition III, (1 July 1992); doi: 10.1117/12.138340; https://doi.org/10.1117/12.138340