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Journal of Modern Optics

Associative Memory Based on Nonlinear Optical Medium Properties

M. Belov, Edward A. Manykin

Published Sep 1, 1990• 0 citations
Publisher

Abstract

Nonlinear-medium properties are examined for optical implementation of an associative memory system. The approach based on these properties allows one to consider two cases of the optical associative memory: spatial pattern recognition and recognition of spectral distributions. The model proposed for this purpose permits nonlinearity in the correlation domain to be used to reduce cross-correlation noise.

DOI
10.1080/09500349014551681

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Nonlinear-medium properties are examined for optical implementation of an associative memory system. The approach based on these properties allows one to consider two cases of the optical associative memory: spatial pattern recognition and recognition of spectral distributions. The model proposed for this purpose permits nonlinearity in the correlation domain to be used to reduce cross-correlation noise.
Associative optical memories have attracted increasing interest as they can offer new, all-optical solutions to various problems, for example in pattern recognition. In such memories, stored informations are retrieved from partial or noisy inputs. An optical laser resonator can act as such an associative processor. Using holograms, different images are associated to each of the modes of the optical cavity. Thus a partial input image can force the resonator to oscillate on the closest stored information. Two wave mixing arrangements in photorefractive crystals, which provide very large amplification factors, can be used to overcome the large losses inherent to these resonators.
We present an experimental study on the use of the time-domain optical memory for image storage and high-speed image processing. We focus on examining the fidelity of the recalled images and their spatial resolution as well as various image-processing operations offered by the memory. The recalled images were found to be of good quality because of their phase-conjugate nature. This unique feature further motivated us to examine the feasibility of fiber optics being used for image transmission, an issue important to the development of such a memory device. Two primary processing operations, two-image convolution and correlation, were demonstrated, and implications of the results for high-speed pattern recognition and optical interconnections are discussed.