STATISTICAL-ANALYSIS ON EXTENDED REFERENCE METHOD FOR VOLUME HOLOGRAPHIC DATA-STORAGE

We previously (1995) proposed a novel recording method to reduce the c rosstalk noise and improve the storage capacity in angle-multiplexed v olume holographic data storages. Instead of conventionally using a pla ne wave (point reference) to record holograms, the technique employs a recording reference extending uniformly within a narrow spatial frequ ency bandwidth and reads the memory with a plane wave. The analytical results show that the SNR obtained by using the extended reference met hod is about 20 dB higher than that achieved in terms of the conventio nal recording method. For interpixel crosstalk noise, a statistical an alysis 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 c rosstalk-limited storage density. The results show that the proposed e xtended reference method achieves about 10 times larger storage densit y than the point reference method. (C) 1997 Society of Photo-Optical I nstrumentation Engineers.