29-05-2014, 10:43 AM
Optical Switching Switch Fabrics, Techniques and Architectures
Optical Switching Switch.ppt (Size: 585 KB / Downloads: 13)
Introduction
New services like VOD, IPTV
DWDM (Dense Wavelength Division Multiplexing) is developed
Then, What is problem?
Slow O/E/O conversion.
Electronic equipment is dependent on the data rate & protocol. (non-transparent)
Optical switch - Optical Switch Fabrics
Optical Switch Fabrics
Allow switching directly in the optical domain (All-optical)
Important parameters
Switching time (↓)
Insertion loss (↓ and loss uniformity at all input-output connections)
Crosstalk (↓)
Extinction ratio (ratio of ON-OFF power) (↑)
Polarization-dependent loss (↓)
Optical Packet Switching
Optical Circuit Switching
Limited circuit
Low efficiency (due to fixed bandwidth)
Optical Packet Switching
Using Packet ( = Header (for routing) + Data )
If Optical Packet Switching is realized, it can
allocate WDM channels on demand (microsecond)
share network resource efficiently
offer high-speed data rate/format transparency & configurability
Conclusion
Switching functions must be executed optically
Two obstacles
In the future, breakthroughs may counteract the fundamental limitations of optics
Then, current network is completely changed