Encrypted optical storage with angular multiplexing.
We present the first, to our knowledge, demonstration of an encrypted optical storage based on double-random phase encoding by using angular multiplexing in a photorefractive material. Original two-dimensional data are encrypted by use of two random phase codes located in the input and the Fourier planes and are then stored holographically in a LiNbO(3):Fe crystal. The retrieval of the original data can be achieved with a phase-conjugated readout scheme. We demonstrate the encryption and the decryption of multiple frames of two-dimensional digital data by using angular multiplexing. We also evaluate numerically the influence of the bandwidth of the optical system on the decrypted digital data. The bit error rate as a function of the optical system bandwidth is presented.
Matoba
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O
Institute of Industrial Science, University of Tokyo, 7-22-1 Minato-ku, Roppongi, Tokyo 106-8558, Japan. matoba@iis.u-tokyo.ac.jp
Javidi
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B