Suppression of noise in optical associative memories by real-time thresholding

Zhijie Deng; De-Kui Qing; Philip R. Hemmer; M. Suhail Zubairy

doi:10.1117/12.610953

23 May 2005 Suppression of noise in optical associative memories by real-time thresholding

Zhijie Deng, De-Kui Qing, Philip R. Hemmer, M. Suhail Zubairy

Proceedings Volume 5842, Fluctuations and Noise in Photonics and Quantum Optics III; (2005) https://doi.org/10.1117/12.610953
Event: SPIE Third International Symposium on Fluctuations and Noise, 2005, Austin, Texas, United States

Abstract

Associative memories that recognize a pattern based on partial input have numerous applications such as homeland security. Optical implementations of associative memories, for example using computer-generated holograms, have the inherent parallelism as an advantage over software realizations. The nonlinear thresholding operation is a key step in the optical associative memories. A major source error in these memories is the thresholding uncertainties caused by fluctuation, for example in the input illumination or varying degrees of partial obscuration. Here, we show a proof-of-principle demonstration of a new scheme to suppress such errors using real time thresholding and a modified Hopfield associative memory model.

Citation Download Citation

Zhijie Deng, De-Kui Qing, Philip R. Hemmer, and M. Suhail Zubairy "Suppression of noise in optical associative memories by real-time thresholding", Proc. SPIE 5842, Fluctuations and Noise in Photonics and Quantum Optics III, (23 May 2005); https://doi.org/10.1117/12.610953

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