Lateral shift multiplexing with a modified random mask in a joint transform correlator encrypting architecture

The joint transform correlator JTC is a classical optical ar- chitecture, recently associated with interesting applications in optical se- curity. In addition, multiplexing is a tactic associated with optical encrypt- ing 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 modi- fication 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 en- trance plane of the JTC. We present a theoretical explanation, along with computer simulations and experimental results, that support our proposal. © 2009 Society of Photo-Optical Instrumentation Engineers.

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