Optical implementation of a single-layer finite impulse response neural network
Paulo E. X. Silveira, G. S. Pati, Kelvin H. Wagner · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
This paper demonstrates a space integrating optical implementation of a single-layer FIRNN. A scrolling spatial light modulator is used for representing the spatio-temporal input plane, while the weights are implemented by the adaptive grating formation in a photorefractive crystal. Differential heterodyning is used for low-noise bipolar output detection and an active stabilization technique using a lock-in amplifier and a piezo-electric actuator is adopted for long term interferometric stability. Simulations and initial experimental results for adaptive sonar broadband beamforming are presented.