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Optical Engineering

Lateral shift multiplexing with a modified random mask in a joint transform correlator encrypting architecture
Author(s): Edgar Rueda; John Fredy Barrera Ramírez; Rodrigo H. Henao; Roberto Daniel Torroba
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Paper Abstract

The joint transform correlator (JTC) is a classical optical architecture, recently associated with interesting applications in optical security. In addition, multiplexing is a tactic associated with optical encrypting mechanisms that provide security for multiple users. However, experimental constraints arise when we intend to reproduce a diffuser shifting multiplexing option. This is due to the invariance to lateral shifts under a JTC setup. To overcome this problem, we propose a setup modification that allows its use under a multiplexing approach. Instead of placing the encrypting mask in contact with the input JTC plane, we use the actual optical Fourier transform of a diffuser projected over the entrance plane of the JTC. We present a theoretical explanation, along with computer simulations and experimental results, that support our proposal.

Paper Details

Date Published: 1 February 2009
PDF: 6 pages
Opt. Eng. 48(2) 027006 doi: 10.1117/1.3080753
Published in: Optical Engineering Volume 48, Issue 2
Show Author Affiliations
Edgar Rueda, Univ. de Antioquia (Colombia)
John Fredy Barrera Ramírez, Univ. de Antioquia (Colombia)
Rodrigo H. Henao, Univ. de Antioquia (Colombia)
Roberto Daniel Torroba, Univ. Nacional de la Plata (Argentina)

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