PowerPoint Presentation On Holography

Presentation On Holography

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Holography Presentation Transcript:

1. What is Holographic Memory ?
It is a memory that can store information in form of holographic image. It is a technique that can store information at high density inside crystals or photopolymers. It provides data to be written beneath the surface of the disc. Holographic memory can store up to 1 Tb in a storage medium the size of a sugar cube crystal.

2. Why do we need this ?
“For Internet applications alone, industry estimates are that storage needs are doubling every 100 days” By the year 2010, a storage system serving an average LAN will need … 100 TB and a WAN server will require 10TB to 1 petabyte …of storage” (Red Herring)

3. Properties of Hologram
A block or sheet of photosensitive material which records the diffraction of two light sources. A laser beam is splatted into two beams: Source beam Reference beam The two beams diffracts to form the image on the recording medium

4. Spatial light modulator
It is used for creating binary information out of laser light. It is a 2D plane, consisting of pixels which can be turned on and off to create binary 1.s and 0.s. It contains a two-dimensional array of windows, which are only microns wide.

5. Page Data Access
As the data is stored in the form of holograms, data retrieval must be in the same form. So, a holographic system sends data in the form of pages. It provides fast access times.

6. Error Correction
As the density of data is massive, it is prone to errors. Errors can be controlled by: Recording errors Page level parity bits Interfacing

7. Recording Errors Cause:
Noise generated by laser beam Result: Can change a binary 0 to binary 1 Possible Solution: Improvement in laser beam and recording material

8. Page-level Parity Bits
Data is stored in the form of 2-D array Odd no. of bits accounts for parity 1 Even no. of bits accounts for parity 0 Parity check bits are used to identify any errors present in the array

9. Interfacing
While reading the data, they are sent to the computer as sheets. Such thing may exceed the processor throughput Remedy: Defining set of rules which can be used for correction and reading of data efficiently.

10. For more please refer our PPT. Thanks.