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Browse Prior Art Database

High Data Rate Holographic Storage Device

IP.com Disclosure Number: IPCOM000122757D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 36K

Publishing Venue

IBM

Related People

Dube, R: AUTHOR [+3]

Abstract

In a holographic storage device within which blocks of data are stored in discrete spots on a medium, each spot being addressed for write or read by illuminating the spot with appropriate laser beams, the data transfer rate into or out of the device can be increased by writing to, or reading from multiple spots in parallel.

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High Data Rate Holographic Storage Device

      In a holographic storage device within which blocks of data are
stored in discrete spots on a medium, each spot being addressed for
write or read by illuminating the spot with appropriate laser beams,
the data transfer rate into or out of the device can be increased by
writing to, or reading from multiple spots in parallel.

      Since the holographic storage is inherently tolerant of
position errors, parallel access to multiple spots does not require
exceptional control of manufacturing tolerance, temperature, or
precision of the locating mechanism.  The multiplicity of laser beams
required to address the desired spots can be generated from a single
laser by splitting of the laser beam.  The storage medium can be
constructed as a single unit, and only a single location mechanism is
required to position the laser beams with respect to the spots on the
medium.

      Thus, the data rate of the holographic storage can be
multiplied by parallel read and write at the cost of additional
lenses, photocomposers and photodiode arrays, but using only a single
laser, a single access mechanism and a single (possibly larger)
storage medium.

      Disclosed anonymously.