holographic versatile disc1

8/14/2019 Holographic Versatile Disc1

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Holographic Versatile Disc


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CONTENTS

What is HVD ? Holographic Versatile Disc Structure Working Principal HVD Write System HVD Read System How HVD compares Others ? Advantages HVD Alliance HVD Forum Conclusion References


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What is HVD ?

An HVD is an advanced optical disk thats presently in thedevelopment stage. Polaroid scientist J van Heerden was thefirst to come up with the idea for holographic three-dimensional

storage in 1960. Holographic Versatile Disc (HVD) is an optical disc

technology still in the research stage which would hold up to 3.9terabytes (TB) of information .

The first step in understanding holographic memory is tounderstand what "holographic" means.

Holography : Holography is a method of recording patterns oflight toproduce a three-dimensional object.

Hologram : The recorded paterns of light are called a hologram
http://www.howstuffworks.com/light.htmhttp://www.howstuffworks.com/light.htm


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HVD Structure Green writing/reading laser (532 nm) Red positioning/addressing laser (650 nm) Hologram (data) Polycarbon layer Photopolymeric layer (data-containing layer) Distance layers Dichotic layer (reflecting green light)

Aluminium reflective layer (reflecting redlight)


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Working Principle HVD uses a technology called 'collinear holography,' in

which two laser rays, one blue-green and one red, arecollimated into a single beam..

The blue-green laser reads data encoded as laser

interference fringes from a holographic layer near the topof the disc while the red laser is used as the referencebeam and to read servo information from a regular CD-style aluminium layer near the bottom.

Servo information is used to monitor the position of theread head over the disc, similar to the head, track, andsector information on a conventional hard disk drive.


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Reference: http://electronics.howstuffworks.com/hvd.html


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HVD Write System

A simplified HVD system consists of the followingmain components:

Blue or green laser (532-nm wavelength in thetest system)

Beam splitter/merger Mirrors Spatial light modulator (SLM) CMOS sensor Polymer recording medium


9/24Reference: http://electronics.howstuffworks.com/hvd.html


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HVD Read System To read the data from an HVD, you need to retrieve the light

pattern stored in the hologram.

In the HVD read system, the laser projects a light beamonto the hologram -- a light beam -- a light beam that is

identical to the reference beam. The hologram diffracts this beam according to the specific

pattern of light interference it's storing.

The resulting light recreates the image of the page data thatestablished the light-interference pattern in the first place.When this beam of light -- the reconstruction beam --bounces back off the disc it travels to the CMOS sensor thatreproduces the page data.


11/24Reference: http://electronics.howstuffworks.com/hvd.html


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.How HVD compares Others ?

Blu-ray HD-DVD HVD

Initial cost forrecordaable disc

Approx. $18 Approx. $10 Approx. $120

Initial cost for

recorder/player

Approx. $2,000 Approx. $2,000 Approx. $3,000

Initial storagecapacity

54 GB 30 GB 300 GB

Read/write speed 36.5 Mbps 36.5 Mbps 1 Gbps

While HVD is attempting to revolutionize data storage, other

discs are trying to improve upon current systems. Two such

discs are Blu-ray and HD-DVD, deemed the next-generation

of digital storage.


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Advantages

High Storage capacity of 3.9 terabyte(TB)enables user to store large amount of data.

Records high-definition television (HDTV)

without any quality loss. Records one program while watching

another on the disc. Edit or reorder programs recorded on the

disc. Automatically search for an empty space on

the disc to avoid recording over a program.


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Users will be able to connect to the Internet and

instantly download subtitles and other interactive

movie features

Backward compatible: Supports CDs and DVDs

also.

The transfer rate of HVD is up to 1 gigabyte (GB)

per second which is 40 times faster than DVD .

An HVD stores and retrieves an entire page of

data, approximately 60,000 bits of information, in one

pulse of light, while a DVD stores and retrieves onebit of data in one ulse of li ht.

Continued.


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HVD Alliance


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The HVD Forum

The HVD FORUM (formerly the HVD Alliance) is a coalition ofcorporations purposed to provide an industry forum for testing andtechnical discussion of all aspects of HVD design & manufacturing.

Alps Electric Corporation, Ltd. Optware Corporation CMC Magnetics Corporation Dainippon Ink and Chemicals, Inc. (DIC) EMTEC International (subsidiary of the MPO Group) Fuji Photo Film Company, Ltd. Konica Minolta Holdings, Inc. LiteOn Technology Corporation Mitsubishi Kagaku Media Company, Ltd. (MKM)


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Conclusion

HVD will soon replace previous DVDs. It is currently supported by more than 170 of the

world's leading consumer electronics, personal

computer, recording media, video game and musiccompanies. The format also has broad support from the major

movie studios as a successor to today's DVDformat.

Holographic Versatile Disc already has the backingof seven out of eight leading Hollywood studios. Itwill soon be able to enjoy a growing range of filmentertainment with unsurpassed Full HD picturesand cinema-quality multi-channel sound.


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References

http://www.tech-faq.com/hvd.shtml. http://electronics.howstuffworks.com/hvd.html http://en.wikipedia.org/wiki/Holographic_Versatile_

Disc http://www.eweek.com/article2/0,1759,1759907,00

.asp http://www.news.com/Group-aims-to-drastically-

up-disc-storage/2100-1041_3-5562599.html


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How does Collinear Works?


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