Using volume holograms to search digital databases

Geoffrey W. Burr; George Maltezos; Felix Grawert; Sebastian Kobras; Holger Hanssen; Hans J. Coufal

doi:10.1117/12.454036

23 January 2002 Using volume holograms to search digital databases

Geoffrey W. Burr, George Maltezos, Felix Grawert, Sebastian Kobras, Holger Hanssen, Hans J. Coufal

Proceedings Volume 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage; (2002) https://doi.org/10.1117/12.454036
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Holographic data storage offers the potential for simultaneous search of an entire database by performing multiple optical correlations between stored data pages and a search argument. This content-addressable retrieval produces one analog correlation score for each stored volume hologram. We have previously developed fuzzy encoding techniques for this fast parallel search, and holographically searched a small database with high fidelity. We recently showed that such systems can be configured to produce true inner-products, and proposed an architecture in which massively-parallel searches could be implemented. However, the speed advantage over conventional electronic search provided by parallelism brings with it the possibility of erroneous search results, since these analog correlation scores are subject to various noise sources. We show that the fidelity of such an optical search depends not only on the usual holographic storage signal-to-noise factors (such as readout power, diffraction efficiency, and readout speed), but also on the particular database query being made. In effect, the presence of non-matching database records with nearly the same correlation score as the targeted matching records reduces the speed advantage of the parallel search. Thus for any given fidelity target, the performance improvement offered by a content-addressable holographic storage can vary from query to query even within the same database.

Citation Download Citation

Geoffrey W. Burr, George Maltezos, Felix Grawert, Sebastian Kobras, Holger Hanssen, and Hans J. Coufal "Using volume holograms to search digital databases", Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); https://doi.org/10.1117/12.454036

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