SINGLE-RAIL TRANSLATION-INVARIANT OPTICAL ASSOCIATIVE MEMORY

A single-rail optical memory is proposed. The associated memory is bas ed on a double-correlator architecture coupled with an optoelectronic thresholding feedback module. The latter permits complete translation invariance of the neural network. The system requires only a single 35 -mW He-Ne laser. The associative memory is recorded with the help of c omputer-generated holograms. The global iterative coding [Opt. Eng. 32 , 2216 (1993)] technique provides good performance with high diffracti on efficiency.