HOLOGRAPHIC VERSATILE

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• HOLOGRAPHIC VERSATILE
• DISC

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Outline

• What is HVD?
• Collinear Holography.
• Basic structure
• How it work?
• Compare with other devices.
• Advantages/Disadvantages
• Conclusion

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What is HVD ?

• Holographic Versatile Disc (HVD) is an optical
  disc technology which would hold up to 3.9
  terabytes (TB) of information.
• It employs a technique known as collinear
  holography.

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Collinear Holography

• In collinear holography there are two type of
  laser beam.
• Red beam(Information beam)
• Green beam(Refrence beam)
• This two beams are collimated in a single beam.
• The green laser reads data encoded as laser
  interference fringes from holographic layer near
  the top of the disc.

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• while the red laser is used as the reference
  beam and to read servo information from a regular
  CD-style aluminum layer near the bottom.
• A dichroic mirror layer between the holographic
  data and the servo data reflects the green laser
  while letting the red laser pass through.
  

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Basic structure

• It has similar to CD-DVD structure. It is differs
  to use laser beams its pulse speed.
• The Components are like
• blue or green laser(532 nmwl),
• red laser ,beam splitter, mirrors
• special lights modulator(SLM),
• C-MOS sensor ,photo polymer
• recording medium.

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How it works?

• Current optical storage saves one bit per pulse
  the HVD hopes to improve this efficiency with
  capability of around 60,000 bits/pulse.
• Truncated cone shape that has 200 micrometer
  diameter at the bottom
• 500 micrometer diameter at top.

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• Data-SLM-Binary
• Data is created to fire laser beam into the beam
  splitter to produce 2 beam.
• 1.Reference beam ( Directed to away
• from the SLM).
• 2.Information beam ( Direct toward
• the SLM ).

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• The 0s 1s data pages are translated into the
  pixel of the special light modulator that either
  block or tr-
• ansmit light.
• A memory system isn't very useful if you can't
  access the data you've stored.

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Capacity, Speed, Cost Comparison
    Capacity Writing/ Reading Speed Discs Approx. Cost Recordable Player Approx. Cost
Holographic Versatile Discs (HDSS) HVD 300 GB 1.6 TB 1 GB/s 120 3000
Blu-ray Discs BD 25 GB 50 GB 36.5 Mb/s 18 2000
Digital Versatile Discs DVD HD-DVD 5 GB 30 GB 36.5 Mb/s 10 2000
Compact Discs CD 783 MB 1.3 GB 36.5 Mb/s 4 200
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Advantages

• HVD have the capacity to hold up to 3.9 terabytes
  (TB) of information, which is approximately 5,500
  times the capacity of a CD-ROM,830 times the
  capacity of a DVD,160 times the capacity of
  single-layer Blu-ray Discs, and about 4 times the
  capacity of the largest computer hard drives as
  of 2007.

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• The HVD also has a transfer rate of 1 Gbit/s (128
  MB/s).
• It has been estimated that the books in the U.S.
  Library of Congress, one of the largest libraries
  in the world, would contain a total of about 20
  terabytes if scanned in text format. Not
  including images from the books, the content
  could be stored with capacity to spare on six 3.9
  TB discs.

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• Using MPEG4 ASP encoding, a 3.9 TB HVD could hold
  4,60011,900 hours of videojust over one year of
  uninterrupted video at usual encoding rates.
• Using typical satellite radio encoding
  (CT-aacPlus at 40 kbit/s), a 3.9 TB HVD could
  hold over 26.5 years of uninterrupted stereo
  audio.

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Disadvantages

• Holography memory has
• been around for more than 40 years
• but several characteristic made it difficult
  to implement , now progras
• of HVD make it easy to implement.
• It is not available in market.

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References

• Ashley, J. et al. Holographic Data Storage IBM
  Journal of Research and Development, Vol 44, No
  3, 2000, pp 341-368
• Ferri, Vic. Holographic Video Storage TechTrax,
  http//pubs.logicalexpressions.com/Pub0009/LPMArti
  cle.asp?ID118
• Orlov, Sergei S. et al. High-transfer-rate
  high-capacity holographic disk data-storage
  system Applied Optics, Vol 43, No 25, Sept. 1
  2004, pp 4902-4914
• Psaltis, Demitri and Mok, Fai. Holographic
  Memories Scientific American, Nov. 1995, pp
  70-76
• Schwartz, Karen D. HVD Coming to a Storage
  Device Near You eWeek, Feb. 3, 2005,
  http//www.eweek.com/article2/0,1759,1759907,00.as
  p
• Blue laser media offers terabytes on a disc
  Mar. 12, 2004. http//www.ferret.com.au/articles/4
  9/0c01d949.asp
• Ecma International creates TC44 to standardize
  Holographic Information Storage systems
  http//www.ecma-international.org/news/TC44_PR_Jan
  2005.htm
• Holographic Disk is Quickly Searchable Laser
  Focus World, Feb. 2003, p 17
• Holographic Storage Takes a Step Toward
  Viability Photonics Technology World Oct. 1998
  http//www.photonics.com/spectra/tech/XQ/ASP/techi
  d.422/QX/read.htm
• Technology http//www.optware.co.jp/english/tec
  h.htm

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