Abstract
This chapter reviews phase-code multiplexing and discusses the construction of generalized Hadamard phase. Rotation multiplexing is introduced as a means to increase the storage density. A demonstration system made of all off-the-shelf devices is proposed that can be used to demonstrate the technical feasibility and evaluate the performance potential. The storage density of phase-code-multiplexed holographic memory is primarily limited by the number of pixels of currently available spatial light modulators. This limitation can be significantly alleviated by employing generalized Hadamard phase codes and by combining the rotation multiplexing method. With state-of-the-art and yet off-the-shelf optoelectronic devices, thousands of data pages can be stored in the same volume of photorefractive crystal with the phase-code and rotation multiplexing method.
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