We propose and demonstrate a fractional Fourier domain encrypted
holographic memory using an anamorphic optical system. The
encryption is done by use of two statistically independent random-phase
codes in the fractional Fourier domain. If the two random-phase
codes are statistically independent white sequences, the encrypted data
are stationary white noise. We exploit the capability of an optical
system to process information in two dimensions by using two different
sets of parameters along the two orthogonal axes to encode the
data. The fractional Fourier transform parameters along with the
random-phase codes constitute the key to the encrypted data. The
knowledge of the key is essential to the successful decryption of
data. The decoding of the encoded data is done by use of phase
conjugation. We present a few experimental results.
© 2001 Optical Society of America
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