Security wavelength multiplexing under a JTC scheme

DAFNE AMAYA; MYRIAN TEBALDI; ROBERTO TORROBA; NÉSTOR BOLOGNINI

Sydney, Australia

Congreso; ICO 21 – 2008 Congress Optics for the 21st Century; 2008

ICO

Optical field provides an environment for studies on information technologies for security and encryption systems and holographic memory systems. Typically, statistically independent random phase masks are important components of those methods. The studies, verify that the decryption performance is sensitive to the operation wavelength. The configuration of a joint transform correlator (JTC) where two-dimensional data and a key code are placed side-by-side at the input plane is one of the alternatives for optical security implementations. This optical setup is more compact than an ordinary holographic setup because the object and reference beams share a single optical system consisting of two Fourier-transforming lenses. Optics has many degrees of freedom (wavelength, polarization, three-dimensional topology, etc.). Some of these parameters are used in several papers for multiplexing data. Therefore, we propose in the present contribution the way to implement a wavelength multiplexing technique with a JTC architecture. We use a JTC to perform the correlation between the convolution of a phase-encoded primary object along a random code mask and a phase distribution used as reference. We present computer simulations characterizing the method and confirming the performance of the proposed system.