Optical computers

Name: Rumana Nisar Sain

3^nd yr B.tech ( electronics and telecommunication)

Under guidance:Prof.snehal Gaikwad

content

Introduction

Why optical computers

How it works

Components

Components used in optics

Real image of optical computer

Example of optical computer

• Optical memory
• Optical disk

Advantage

Disadvantage

Current research

Conclusion

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Introduction

Optical computer performs computation,operate,store and transmit data using only light

An optical computer is a device that uses the photons in visible or

infrared beams ,rather than electric current to perform digital computation

INPUT

OPTICAL PROCESSOR

INTERFACE

WHY OPTICAL COMPUTER????

• Light travel 10 times faster then electron so using light the data transmission rate can be increased.
• Optical data processing can be done in parallel process.
• Optical material have a superior storage density and accessibility over magnetic material.

How it works???

• Light (photons) in the place of electrons.
• Transistor , logical gates etc are simulated using optics.
• There are switches that are activated by beams of light rather then by pulse of electricity.

COMPONENTS

• VCSEL( vertical cavity surface emitting micro laser)
• PHOTONIC crystal
• SLM(spatial light modulators)
• LOGICAL GATES
• SMART PIXELS

VCSEL

It Emits light in cylindrical beam vertically from the surface of fabricated wafer

Photonic crystal

It’s Replace transistor in optical computers

It is similar to semiconductor

SLM

Stands for Spatial light modulators

Modulates the intensity and Phase of light beam

Logical gates

It is the building blocks of any digital device

It is on when device transmits light and it is OFF when it blocks light

Smart pixel

Union of Optics and electronics

He-Ne laser �it continues power output fraction of 1mw to 100mv�Nd:YAG laser�It is a solid state four level laser system�Convex lens�converge the light after passing through phthalocyanine �filters�block Nd YAG laser beam and pass He Ne laser beam�detector�Convert the laser signal to electrical signal

components used in optical

Real image of optical computer

Optical computing has two types of memory �One consists of arrays of one bit store elements �And other is mass storage which is implemented by optical disks or by holographic storage system

Example of optical computer (optical memory)

It stores 4.6 gb data �Can store 10 lakes types pages �Optical disk uses laser bean to read data

Optical disk

ADVANTAGES

• Increase in the speed of computation
• Free from electrical short circuits
• Have low loss transmission and large bandwidth
• Capable of communicating several channels in parallel without interface
• Posses superior her storage density and accessiblites
• No power loss due to excesss of heating

Disadvantages

• Making photonic crystals is a difficult process
• It is bulky in size and not movable

Some current research

• A group of researchers from the universities of southern California , jointly with a team from the universities of California , los angles have developed an organic polymer with a switching frequences of 60ghz
• Another group at brown universities and IBM almaden research center has used ultrafast laser pulses to built ultra fast data storage devices.

CONCLUSION

• Research in optical computing has opened up new possibilities in several field realeted to high performance computing high speed communication

THANK YOU