holographic versatile disc - seminar

Nitin Balakrishnan

08103046

HOLOGRAPHIC VERSATILE DISC

1

Guided by :- Sivananaintha Perumal P.

11/29/2011

Outline • Introduction

• What is HVD?

• Basics of Holographic memory

• Technology used in HVD

• Structure of HVD

• Writing data

• Reading data

• Advantages, disadvantages and applications of HVD

• Facts

• Future Aspects

• Conclusion

• Reference

2

Introduction

HVD is an advanced optical disk that‟s presently in the

development stage.

Storage capacity :- 1 terabyte (TB).

Data transfer rate :- 1 Gigabit per second.

The technology permits over 10 kilobits of data to be written

and read in parallel with a single flash.

3

Introduction An HVD would be a successor to today‟s Blu-ray and HD-

DVD technologies.

Advancements in the technology were made, in the early 21st century.

Developed by the „Holography Storage Development Forum‟

HVD can store up to 60 times the data of a regular DVD and it can read and write data 10 times faster as well.

4

What is HVD ? Definition:- Holographic versatile disc is a holographic

storage format that looks like a DVD but is capable of storing far more data.

Prototype HVD devices have been created with a capacity of 3.9 terabytes (TB) and a transfer rate of 1 Gbps.

1 HVD = 5,500 CD-ROMs = 830 DVDs = 160 Blu-ray discs

Uses laser beams to store data in 3D.

5

What is HVD ?

6

Basics of Holographic Memory

Holography is a method of recording patterns of light to

produce a 3D object.

The recorded patterns of light are called a hologram.

Creation of a hologram begins with a focused beam of light, a

laser.

Laser splits up into 2 :-

Reference beam

Information beam

7


When light encounters an image its composition changes.

When the information beam encounters an image, it carries

that image in its waveforms.

When the two beams intersect, it creates a pattern of light

interference and that can be recorded on the photosensitive

polymer layer of a disc.

8


To retrieve the information stored in a hologram, shine the

reference beam onto the hologram. When it reflects off the

hologram, it holds the light pattern of the image stored

there.

This reconstruction beam is then send to a CMOS sensor to

recreate the original image.

9

Technology used in HVD Collinear holography – The laser beams are collimated.

Blue-green laser reads the data encoded in the form of laser

interference.

Red laser serves the purpose of reference beam and to read the

servo info.

A layer of dichroic mirrors, between the holographic and servo

data layer reflects back the blue-green laser beam, letting only the

red laser pass through it to reach the servo information.

10

Technology used in HVD

The concepts of collinear holographic memories are:

To increase the recording capacity, thick volume-recording

media is used

The optical disk is pre-formatted with addresses and optical

servo information

The beam for the optical servo is utilized to provide

backward compatibility with the existing CDs or DVDs

11

Structure of HVD The Holographic Versatile Disc structure consists of the

following components:

Green writing/reading laser (532 nm)

Red positioning/addressing laser (650 nm)

Hologram (data)

Polycarbon layer

Photopolymeric layer (data-containing layer)

Distance layers

Dichroic layer (reflecting green light)

Aluminum reflective layer (reflecting red light)

Transparent base

12

Structure of HVD

13

Writing data A simplified HVD system consists of the following main

components:

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

Beam splitter/merger

Mirrors

Spatial light modulator (SLM)

CMOS sensor

Photopolymer recording medium

14

Writing data Information is encoded into binary and is stored in the SLM.

These data are turned into ones and zeroes represented as opaque or translucent areas on a „page‟.

When the information beam passes through the SLM, portions of the light are blocked by the opaque areas of the page, and portions pass through the translucent areas.

When the reference beam and the information beam rejoin on the same axis, they create a pattern of light interference - the holography data.

This interference pattern is stored in the photopolymer area of the disc as a hologram.

15

Writing data

16

Writing data

17

Page Data Hologram

Reading data To read, we‟ve to retrieve the light pattern stored in the

hologram.

Laser is projected onto the hologram – a light beam that is

identical to the reference beam .

The hologram diffracts this beam according to the specific pattern

of light interference its storing.

The resulting light recreates the image of the page data that

established the light-interference pattern – Reconstruction beam.

The reconstruction beam - bounces back off the disc, it travels to

the CMOS sensor.

The CMOS sensor then reproduces the page data.

18

Reading data

19

Advantages, disadvantages and

applications of HVD

Advantages :-

More storage

Reads and writes quickly

Price, expected to be slashed down

Disadvantages :-

Initial price of the player and disc are high.

Price and storage not confirmed, still in R&D.

20

Advantages, disadvantages and

applications of HVD

Applications:-

Used for storing large amounts of data most likely for

large companies.

Could be the most efficient way to backup

information in the near future.

21

Facts It has been estimated that the books in the U.S. Library of

Congress, the largest library in the world , could be stored on six HVDs.

The pictures of every landmass on Earth - like the ones shown in Google Earth - can be stored on two HVDs.

With MPEG4 ASP encoding, a HVD can hold anywhere between 4,600-11,900 hours of video, which is enough for non-stop playing for a year.

22

Future aspects

Have tremendous implications in the commercial, industrial

and d-Cinema realms.

Will find wide use for backing up and archiving the media

libraries, including the one at the Hollywood studios

23

Conclusion

Materialized with the evolution of the collinear holography

technology

Stores far more data than, what a DVD can.

Prototype HVD has a capacity of 3.9 TB and a transfer rate of

1 Gbps.

Hence, 1 HVD = 830 DVDs = 160 Blu-Ray discs

24

Reference [1]. Hideyoshi Horimai and Y.Aoki, “Holographic versatile disc(HVD) System”

[2]. Optical data storage Topical Meeting 2006, 2006page(s):6-8.

[3.] Hideyoshi Horimai and Xiaodi Tan,“Holographic Information Storage System:

[4]. Today and Future,” Magnetics,IEEETransactions on Volume 43/Issue2,part 2 feb2007, page(s):943-947.

[5]. G. Deepika, “Holographic versatile disc” http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5738819&isnumber=5738811

[6]. http://electronics.howstuffworks.com/hvd.htm

[7]. http://electronics.howstuffworks.com/hvd1.htm





[12]. http://en.wikipedia.org/wiki/Holographic_Versatile_Disc

25

THANK YOU !!

27

holographic versatile disc - seminar

Technology

light beam

data information

holography data

page data hologram

servo data layer

kilobits of data

focused beam of light

light pattern