Holographic Versatile Disc

ContentsIntroduction to HVDBasics of Holographic MemoryCloser look at HVDThe HVD system: Writing dataThe HVD system: Reading dataMajor competitorsHow HVD comparesConclusionReferences

Introduction to HVD

• Optical disc• Data storage up to 3.9

TB• Data transfer rate is 1

Gbps• Next-next generation

technology• HVD alliance, led by

Optware Corporation, Japan

• Toshiba, Panasonic, Fuji photo film, Intel Capital and Konica Minolta

HVD

Basics of Holographic Memory

• Holography is a method of recording patterns of light to produce a 3-D object

• Recorded patterns of light are Hologram• Focused beam of light, hence Laser

• Laser beam split into two: Reference & Information

• Reference remains unchanged

• Information beam encounters object, carries that image in its waveform

• These beams intersect creating Light Interference

• This is recorded on Photographic plate generating hologram

Holographic recording

• Shine reference/reconstruction beam on Hologram

• Reflected wave consists the light pattern of the image stored in hologram

• Reconstructed wave sent to CMOS sensor to recreate original image

Reconstruction

• Recording layer placed between 2 substrate layers

- Dichoric mirror layer reflects blue light, which reads data encoded as interference fringes

- Aluminum reflection layer reflects red light, which acts as reference beam, tracks the reading position

Cross section of HVD

The HVD system: Writing data

• Laser source• Beam splitter/merger• Mirrors• Spatial light

modulator (SLM)• CMOS sensor • Photopolymer

recording medium

HVD write system

• Information is encoded into binary data & stored in SLM

- 1’s & 0’s converted into opaque & translucent areas on a page

- This page acts as image through which info beam is going to pass

• Firing of laser beam- portions of light are

blocked by opaque areas of the page

- portions pass through the translucent areas

- thus info beam carries image

Page data stored as hologram

• When reference & information beam rejoin on same axis, creating a pattern of light interference i.e. the holography data

• This joint beam carries the interference pattern to the photopolymer disc & stores it there as a hologram.

The HVD system: Reading data

• Laser projects light beam (identical to reference beam) onto the hologram

• Hologram diffracts this beam according to specific pattern of light interference it is storing

• Resulting light recreates the image of the page data that established the light-interference pattern in the first place

Read system 1

• When reconstruction beam bounces back off the disc, it travels to the CMOS sensor.

• CMOS sensor then reproduces the page data.

Page data in an HVD and recreated CMOS

sensor

Major competitors Optware Corporation, Japan Founded in 1999 Toshiba Corp, Fuji Films,

Panasonic etc

InPhase Technologies, Colorado

Founded in 2000 Hitachi Maxell, Bayer

MaterialScience etc 40 patents associated with

holographic technology

DVD V/S HVD

How HVD compares

Blu-ray HD DVD HVD

Initial cost for recordable disc

$18 $10 $120-180

Initial cost for recorder/player

$2000 $2000 $18000

Initial storage capacity

27 GB54 GB

15 GB30 GB

200 GB-300GB

Read/write speed

36.5 Mbps

36.5 Mbps

1 Gbps

Conclusion

o More storage spaceo Greater access rate o Major drawback: Cost is too higho Initial target customers: Big businesseso Consumer devices could hit the market

around 2010

References

www.inphase-technologies.com http://electronics.howstuffworks.com/

hvd.htm http://en.wikipedia.org/wiki/

Holographic_Versatile_Disc www.tech-faq.com/hvd.shtml http://hvd-forum.org/abouthvd/

technology.html

Thank you