Phase-error considerations for the practical phase code multiplexed holographic memory

For analysis of an effective phase code multiplexing in a holographic memor y system, the Hadamard matrix (HAM) and the pseudorandom phase code (PRC) a re generated and used as a reference beam. In computer simulations, the siz e of the address beam is fixed to 32 x 32 pixels, and 0%, 5%, 10%, 15%, 20% , or 25% phase error rate in a pixel is purposely added to the real phase v alues in order to consider the nonlinear phase modulation characteristics o f the practical spatial-light modulator (SLM). Crosstalks and signal-to-noi se ratios (SNRs) are comparatively analyzed for these two phase codes by ca lculating the auto- and cross-correlation, The cross-correlation mean value s of the PRC and the HAM are 0.067 and 0.139, respectively, which means tha t the SNR of the PRC is higher than the HAM.