11-08-2012, 12:24 PM
Seminar on Optical Networking
Optical.ppt (Size: 1.52 MB / Downloads: 168)
Optical Networking
In most existing networks optical technology is used on links to transport signals
Most processing is carried out electrically, so called node-by-node electrical processing
Moving toward all-optical networks, where transport and processing is optical.
Conventional Electronic & Optical Networking
In most existing networks optical technology is used to transport signals across links
Most processing is carried out electrically, so called node-by-node electrical processing
Demands many expensive Optical to Electronic to Optical (OEO) conversions
Not bit rate transparent
Classic example is an SDH (Synchronous Digital Hierarchy) ring
Disadvantages of Hybrid Electronic/Optical Networking
Demands Optical to Electronic to Optical (OEO) conversions at each node
Significant cost implication
Not bit rate transparent
Power dissipation and physical space are also issues
But does allow very fine bit level control
Why Optical Networking?
Driving forces:
The "electronic bit-rate bottleneck"
The complexity/inflexibility/cost of hybrid electronic/optical systems
The demand for more bandwidth
Development of simple optical processing elements
Widespread deployment of Dense Wavelength Division Multiplexing
Potential for exploitation of the full capacity of singlemode fibre