Experimental opto-digital processing of multiple data via modulation, packaging and encryption

SORAYDA TREJO; JOHN FREDY BARRERA; MYRIAN TEBALDI; ROBERTO TORROBA

Journal of Optics

IOp Publishing

Lugar: Bristol; Año: 2013

2040-8978

A new optodigital protocol to handle multiple data in an efficient and secure way is proposed and experimentally demonstrated. In this method, the optical processor is a 2f system with a ground glass located in its input plane. The 2f system is placed in one arm of a Mach?Zehnder interferometer. The optically processed data are holographically stored and then filtered, theta modulated and multiplexed to obtain a single package containing all processed data. During the filtering procedure, the nonrelevant information contained in the holograms is eliminated.Otherwise, these nonrelevant data will introduce noise over the output plane affecting the retrieved objects. In this case, the theta modulation process performed with a grating allows recovering all data without superposition. In order to get the encrypted package a second random phase masks multiplies the package. The recovering procedure consists in multiplying the encrypted package by the complex conjugate of the random phase mask, an after a Fourier transform operation all data are retrieved. In this way, an authorized user recovers all data with a single operation, in the same plane and at the same time without noise or superposition. Experimental results demonstrate the validity and applicability of the proposal.