Abstract
Orthogonal phase-code multiplexing has been investigated as an alternative to angular or wavelength multiplexing because of its possible implementation with fixed geometry and wavelength, allowing potentially fast access times and cascading in a coherent optical system.1,2 Because the orthogonal phase codes can be generated by using a simple algorithm, the storage of a a large number of codes is not required, as is the case when data are multiplexed with random phase masks. Furthermore, the orthogonal nature of the codes results in better cross-talk performance than for the random-code case3 and permits arithmetic operations to be performed on the stored data.4 We describe a technique for encrypted data storage that uses a random-phase key in combination with the orthogonal codes. The system retains the advantages of orthogonal multiplexing.
© 1995 Optical Society of America
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