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Proceedings Paper

Partial response precoding for parallel readout optical memories
Author(s): Brita H. Olson; Sadik C. Esener
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Paper Abstract

The data density that can be resolved in optical memories is limited by the inherently bandlimited nature of optical systems. In this paper, we show how a precoding technique used in serial communications, Partial Response (PR) precoding, can be applied to a parallel readout optical system to pre-compensate for the spatial data broadening that occurs as a result of this bandlimiting. We examine the performance of 1+D PR precoding, a particular form of PR precoding, in an unapodized coherent imaging system. However, this technique can also be applied to other readout systems. A factor of 15 improvement in average worst case contrast ratio and a factor of 11 improvement in average contrast ratio were measured experimentally. Approximately 50% more area would be needed to achieve the same contrast ratio in a system without precoding. PR precoding was also found to be robust to defocusing and slight tilts, and can be used with a broad range of detector sizes.

Paper Details

Date Published: 9 November 1993
PDF: 11 pages
Proc. SPIE 2026, Photonics for Processors, Neural Networks, and Memories, (9 November 1993); doi: 10.1117/12.163624
Show Author Affiliations
Brita H. Olson, Univ. of California/San Diego (United States)
Sadik C. Esener, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 2026:
Photonics for Processors, Neural Networks, and Memories
Stephen T. Kowel; William J. Miceli; Joseph L. Horner; Bahram Javidi; Stephen T. Kowel; William J. Miceli, Editor(s)

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