Coding development for an optical associative memory

Reeder Noah Ward; Lynda M. Ralston; George Clark

doi:10.1117/12.212031

16 June 1995 Coding development for an optical associative memory

Reeder Noah Ward, Lynda M. Ralston, George Clark

Proceedings Volume 2489, Transition of Optical Processors into Systems 1995; (1995) https://doi.org/10.1117/12.212031
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

An optical associative memory provides rapid content addressing of freeform alphanumeric text stored on an optical disk. A highly parallel, space-integrating intensity correlator has been breadboarded using off-the-shelf components for proof of concept and identification of component characteristics. Performance is found to be sensitive to light source coherence, optics modulation transfer function, media bit placement and contrast uniformity. Simplified processing algorithms extendable to on-chip implementation are evaluated with simulated and experimental results. Conventional codes cannot be optimized to provide a unique coding for a given work, nor do they have a constant optical return from large-area illumination; these are essential to facilitate the correlation readout. A custom code has been developed for correlation readout optimization.

Citation Download Citation

Reeder Noah Ward, Lynda M. Ralston, and George Clark "Coding development for an optical associative memory", Proc. SPIE 2489, Transition of Optical Processors into Systems 1995, (16 June 1995); https://doi.org/10.1117/12.212031

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