OpticalComputing1.Ppt 476

8/3/2019 OpticalComputing1.Ppt 476

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CONTENT

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INTRODUCTION

With the growth of computing technology theneed of high performance computers (HPC)has significantly increased. Optics has been

used in computing for a number of years butthe main emphasis has been and continues tobe to link portions of computers, forcommunications, or more intrinsically in

devices that have some optical application orcomponent (optical pattern recognition etc.)

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WHY WE NEED OPTICAL COMPUTERS?

Rapid growth of the Internet Network speeds currently limited by

electronic circuits

Terabit speeds are required Traditional silicon circuits have a physical

limit

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WHAT IS THE OPTICALCOMPUTING?

Consider E-mail

.txt format

ElectronicTo PhotonicConverter

Fiber opticcables

Optical Computers perform computations,operate, store and transmit data using only

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COMPONENTS FORCOMPUTING

VCSEL (Vertical Cavity Surface EmittingLaser)

SPT (Smart Pixel Technology)

WDM (Wavelength Division Multiplexing)

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VCSEL & PHOTODIODE


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SMART PIXEL

TECHNOLOGYSmart pixel technology is a relatively newapproach to integrating electronic circuitry andoptoelectronic devices in a common framework.

The purpose is to leverage the advantages ofeach individual technology and provide improvedperformance for specific applications.

Here, the electronic circuitry provides complexfunctionality and programmability while theoptoelectronic devices provide high-speedswitching and compatibility with existing opticalmedia.

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DEVICES FOR OPTICAL

COMPUTING Logic gates :Logic gates are implemented optically bycontrolling the population inversion that occursto produce lasing. A controlling laser is used tocontrol the population inversion thus causingswitching to occur.

Holographic truth table:

Destructive interference with light to be emittedor not is based on phase relationship.

Logic based on gratings: 1 is represented by vertical grating causing

light

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TRADITIONALINTERCONNECTIONS


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INTERCONNECTIONS IN OPTICALCOMPUTING

Fiber optic cables and optical transceivers arewidely used.

Applications of optical communications likefiber channel and computer networking arealready being used.

Chip to Chip and On-Chip interconnectionpossibilities are still being examined.

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APPLICATION

High speed communications Process satellite data.

Storage area Network Optical crossbar interconnects are

used in a synchronous transfer modesand shared memory multiprocessorsystems.

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ADVANTAGES

Small size High density High speed It is at least 1000 to100000 times faster

than todays silicon machines Low heating of junctions

Optical computer removes the bottleneckin the present day computers

No short circuits

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FUTURE TRENDS


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It requires high power to work in

consumer products

Creates unwanted interference patterndue to scattering effects

It cannot store phase information


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CONCLUSION

Research in optical computing has opened upnew possibilities in several fields related to highperformance computing, high-speedcommunications. To design algorithms thatexecute applications faster , softwaredevelopment will have a major impact in thefuture and the ground rules for the computingmay have to be rewritten.

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OpticalComputing1.Ppt 476