Partial response precoding for parallel readout optical memories

Brita H. Olson, Sadik C. Esener

Research output: Contribution to journalConference articlepeer-review


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 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.

Original languageEnglish (US)
Pages (from-to)580-590
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Nov 9 1993
Externally publishedYes
EventPhotonics for Processors, Neural Networks, and Memories 1993 - San Diego, United States
Duration: Jul 11 1993Jul 16 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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