Storage density estimation for the phase-encoding and shift multiplexing holographic optical correlator

Tianxiang Zheng; Liangcai Cao; Qingsheng He; Guofan Jin

doi:10.1117/12.2025996

26 September 2013 Storage density estimation for the phase-encoding and shift multiplexing holographic optical correlator

Tianxiang Zheng, Liangcai Cao, Qingsheng He, Guofan Jin

Author Affiliations +

Proceedings Volume 8855, Optics and Photonics for Information Processing VII; 88550A (2013) https://doi.org/10.1117/12.2025996
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Holographic optical correlator (HOC) is applicable in occasion where the instant search throughout a huge database is demanded. The primary advantage of the HOC is its inherent parallel processing ability and large storage capacity. The HOC’s searching speed is proportional to the storage density. This paper proposes a phase-encoding method in the object beam to increase the storage density. A random phase plate (RPP) is used to encode the phase of the object beam before uploading the data pages to the object beam. By shifting the RPP at a designed interval, the object beam is modulated into an orthogonal object beam to the previous one and a new group of database can be stored. Experimental results verify the proposed method. The maximum storage number of the data pages with a RPP at a fixed position can be as large as 7,500. The crosstalk among different groups of the databases can be unnoticeable. The increase in the storage density of the HOC depends on the number of the orthogonal positions from the different portions of a same RPP.

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Tianxiang Zheng, Liangcai Cao, Qingsheng He, and Guofan Jin "Storage density estimation for the phase-encoding and shift multiplexing holographic optical correlator", Proc. SPIE 8855, Optics and Photonics for Information Processing VII, 88550A (26 September 2013); https://doi.org/10.1117/12.2025996

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KEYWORDS

Databases

Crystals

Spatial light modulators

Data storage

Holography

Multiplexing

Optical correlators

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