Optical data storage with double random phase codes and wavelength encryption

Abstract

In this paper, a novel double encryption technology is presented. It can encrypt data with not only double phase codes, but also the wavelength. The phase keys and the wavelength keys must be known simultaneously to retrieve the encrypting data, otherwise, the reconstructed data will be white noise like. The basic configuration and principle of optical holographic storage system are first introduced. Holographic data storage can be encrypted by coding the phase of reference beams through orthogonal phase coding. Double phase-encoded holographic storage can be done by placing two phase masks on the input plane and FP plane respectively. When one wants to retrieve the data, he must have the same mask placed on the FP plane, otherwise the data can not be reconstructed. Finally, the encrypted holographic storage system combining optical wavelength and double phase codes is presented theoretically, and proved to be valid by the computer simulation.