Optical EngineeringStatistical analysis on extended reference method for volume holographic data storage
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We previously (1995) proposed a novel recording method to reduce the crosstalk noise and improve the storage capacity in anglemultiplexed volume holographic data storages. Instead of conventionally using a plane wave (point reference) to record holograms, the technique employs a recording reference extending uniformly within a narrow spatial frequency bandwidth and reads the memory with a plane wave. The analytical results show that the SNR obtained by using the extended reference method is about 20 dB higher than that achieved in terms of the conventional recording method. For interpixel crosstalk noise, a statistical analysis is presented and the SNR is given in a closed form for both the point reference and the extended reference methods. Considering both interpage and interpixel crosstalk noise, we further investigate the crosstalk-limited storage density. The results show that the proposed extended reference method achieves about 10 times larger storage density than the point reference method.