Multiple holograms can be stored in a volume holographic medium using the phase encoding technique. The cross-talk noise between volume holograms multiplexed with various orthogonal phase codes is analyzed. Compared with the common Hadamard codes of order of a power of 2, the Hadamard codes whose order is not a power of 2 show a different cross-talk behavior. To achieve the maximum possible storage capacity of a phase-code multiplexed holographic memory, the orthogonal phase codes need to be carefully selected by considering both the available pixel numbers of spatial light modulators and the cross-talk effect between stored holograms.
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