Equalization For High Density Volume Holographic Storage

Abstract

Digital volume holographic storage architectures and techniques are being actively researched since they can provide high data rates and storage densities [1-2]. One of the many factors affecting storage density in the medium is cross-talk [3]. Typically, several stacks of multiplexed holograms are recorded in the storage medium. In order to eliminate inter-page cross-talk between adjacent stacks during read-back, an optical aperture is used. A smaller aperture permits one to closely pack hologram stacks and thereby achieve a higher density. However, in doing so, it introduces inter-symbol interference (ISI) through optical diffraction. The density versus ISI trade-off leads to an optimum aperture size, as we will show.