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
Original Manuscript: April 26, 2000
Revised Manuscript: September 11, 2000
Published: January 10, 2001
Gopinathan Unnikrishnan, Joby Joseph, and Kehar Singh, "Fractional Fourier domain encrypted holographic memory by use of an anamorphic optical system," Appl. Opt. 40, 299-306 (2001)