Holographic data storage (HDS) is a promising technology that has huge capacity. A multiplexing method plays a
significant role in increasing the data capacity. Various multiplexing methods have been researched so far. In this paper,
we proposed shift-peristrophic multiplexing using spherical reference wave and experimentally verified that this method
is efficiently increase the data capacity. A series of holograms was recorded with shift multiplexing and rotating
recording material with the axis of rotation being perpendicular to the material's surface. This method can realize more
than 1 Tbits/inch2 data density recording. Furthermore if we maximize the performance of a recording medium, several
TB per disk capacity would be available.
Holographic data storage (HDS) is a promising technology that has a huge capacity. A multiplexing method plays a significant role in increasing the data capacity. Various multiplexing methods have been researched so far. In this paper, we proposed shift-peristrophic multiplexing using spherical reference beam and experimentally verified that this method is efficiently increase the data capacity. A series of holograms was recorded with shift multiplexing and peristrophic multiplexing with the rotation of the material's surface. This method can realize more than 1 Tbits/inch2 data density recording..
Along with the wider use of high-speed information networks and multimedia, it is increasingly necessary to have
higher-density and higher-transfer-rate storage devices. Therefore, research and development into holographic memories
with three-dimensional storage areas is being carried out to realize next-generation large-capacity memories. The
mainstream in the world is the angle multiplexing method, however, its beam position control is quite severe. In such
situation, we study about shift multiplexing method because it costs not much and its control is easier than the angle
multiplexing. In this experiment, we examined shift selectivity of track direction, radial direction and vertical direction of
the medium. As a result, combining these different kinds of selectivity, we found a possible multiplexing way to achieve
several tera bits per inch square density recording.
Today, along with the wider use of high-speed information networks and multimedia, it is increasingly necessary to have higher-density and higher-transfer-rate storage devices. Therefore, research and development into holographic memories with three-dimensional storage areas is being carried out to realize next-generation large-capacity memories. The mainstream in the world is the angle multiplexing method, however, it costs too much and its control is quite severe. In such situation, we study about shift multiplexing method because it costs not much and its control is easier than the angle multiplexing. In this experiment, we examined shift selectivity of track direction, radial direction and vertical direction of the medium. As a result, combining these different kinds of selectivity, we found a possible multiplexing way to achieve several tera bits per inch square density recording.
We examined the possibility of high-density recording using shift-multiplexed holographic memory with a spherical
reference beam. The use of a spherical reference beam is considered to make it possible to realize a multi-dimensional
multiplex system that uses the disk track direction (x-axis), radial direction (y-axis), and disk thickness direction (z-axis);
this would clearly improve the recording density when compared with the conventional angle multiplex recording. The
experimental results confirm the possibility of multiple recording by 3 dimensional medium shift. Furthermore, the
results indicate that a large capacity memory system of over 1 Tb/in2 can be obtained if a thick medium (about 1.5 mm)
is used.
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