Optical+Switches

Optoelectronic Systems:
Device, Integration, Packaging, and Systems Optical Switching Systems
ECE 6542
Gee-Kung Chang
Byers Eminent Scholar Chair Professor School of Electrical and Computer Engineering Georgia Institute of Technology April 7, 2015
=> Strictly non-blocking
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Permutation Switches
• Rearrangeably non-blocking networks : Any point may be connected to any other point provided we are allowed to re-route some existing connections. Thus it requires temporarily break and make functions. All permutations of inputs to outputs can be established by a rearrangeably non-blocking network. • Strong-sense non-blocking network : Guarantees that a connection from an idle input to an idle output will never be blocked provided that we control and manage all connections following an appropriate algorithm. • Strictly non-blocking network : Guarantees that a connection from an idle input to an idle output will never be blocked, and any available path can be used for any connection at anytime.
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Class Announcement: Term Paper
• The term paper is due on April 13, 2015 and the presentations are scheduled on April 14 and 16. • You can choose a preferred date for term paper presentation based on the time stamp of your submission. Early birds get to choose first. • You will get a time slot of 7 minutes to present your term paper results with a maximum number of 7 slides to be submitted via email by midnight April 14. No slides will be accepted in the class. • Please use IEEE double column standard format as posted on T-square.
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Architecture of Dynamic Nodes
Permutation Matrix (one-on-one)
Output ports
1 1 2 3 4 1 1
Generalized Matrix
Output ports
2 3 4
1 1 1 1 Input ports
1 1 1 1 1 1
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Functions of Optical Switches
• Configurability
– Multiple single-l access points – Reconfigurable network connections (switch fabrics) – Virtual Private Networks (per wavelength switching)
An optical subsystem capable of selective and automatic removal or addition of individual wavelengths from an optical fiber system (typical 40 or 80 wavelengths)
• ESS#5 is the last generation of Electronic Switching Systems developed by Bell Labs in 1980s. • Permutation switches are classified in terms of their blocking and connectivity characteristics . • We are considering sequences of demand-assigned connections between input and output ports on the switch with requests for connection establishment and termination occurring at random points in time
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An Optical Add-Drop Multiplexer using Integrated Silicon Photonic Devices
Zmux/zDemux
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Space-Division Optical Switch for OXCs and ROADMs
• Essential functions - various type connections - blocking vs. non-blocking • Performance - insertion loss, speed, crosstalk, power budget - polarization dependent loss (PDL), polarization mode dispersion (PMD) • Scalability - re-usable switching building blocks - large dimension switch • Fault restoration - latching - redundant switching path • Reliability
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Types of Permutation Switches
Characterization and Complexity
Partial Connectivity
Full Connectivity Blocking Rearrangeably non-blocking => Strong-sense non-blocking
Wavelength add-drop multiplexer
Demux Mux ROADM
Transponders
Transponders
• • • • • •
Simpler network control and planning Faster provisioning and turn-up of new transport channels Increased network availability - avoid manual operations Less OEO regeneration due to power equalization Dynamic provisioning of services Mesh network protection options
• Transpar Restoration
OXC: Optical crossconnect – Bit rate, Protocol, Format ROADM: Reconfigurable add-drop multiplexer
OXC
– Multiple paths – Multiple topologies – Multiple network layer
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Optical Switching Systems
Outline
• Introduction • Network Architecture using Optical Switches • Functions of Optical Switches • Switching Performance • Space Switching Techniques • Technology Comparisons • Conclusions
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Optical Switch Functions:
Network Path Connections
1x1 Connect/Disconnect
Dump port 1 1’ 1 2’
1x2 Switch
1’
1xN Switch
2x2 Bar State
1 2 1’ 2’ 1
1’ 2’ 3’
N
2 x N Tree Switch
• Interoperability
– Multiple NE’s – Interchangeable NE’s – Multiple network domains
l Multiwavelength Optical Network