14-12-2012, 05:36 PM
PHOTONIC COMPUTING
PHOTONIC COMPUTING.ppt (Size: 8.84 MB / Downloads: 207)
What is Optical Computer…
An optical computer is a computer that performs its computation with photons as opposed to the more electron-based computation.
Why Optical Computers...?
In silicon computers, the speed of computers was achieved by miniaturizing electronic components.
It is also estimated that the number of transistor switches that can be put onto a chip doubles every 18 months.
So further miniaturization of size introduces several problems such as dielectric breakdown, hot carriers, and short channel effects etc.
Advantages...
Increase in the speed of computation.
Immune to electromagnetic interference.
Free from electrical short circuits.
Have low-loss transmission and large bandwidth.
Capable of communicating several channels in parallel without interference.
Possess superior storage density and accessibility
No power loss due to excess of heating.
Life of the hardware of optical computer is more.
Optical computing ...! How...?
Light in the place of Electron
Uses optical components
Transistors, logical gates etc are simulated using optics.
All-optical components require a high level of laser power to function as required.
Send pulses of light instead of pulses of electricity
Use of Optics in computing..
Use of optics in intercommunication
Here optical fibres are used communicate internally like communicating with peripherals etc.
the use of free-space optical interconnects as a potential solution to alleviate bottlenecks experienced in electronic.
Optical sorting and optical crossbar inter-connects are used in asynchronous transfer modes.
Use of optics in Memory storage
Mass storage, which is implemented by optical disks or by holographic storage systems.
The primary benefits offered by holographic optical data storage over current storage technologies include significantly higher storage capacities and faster read-out rates.
A holographic memory can store data in the form of a hologram within a crystal.
The analog nature of these devices means that data can be stored at much higher density than data written by conventional devices.
CONCLUSION
Optical technology promises massive upgrades in the efficiency and speed of computers, as well as significant shrinkage in their size and cost.
Even though pure Optical computer has many challenges hybrid opto-electrical computer can be expected very soon, and in near future pure optical computer too..