All-Optical Header All-Optical Header Processing Processing in Optical Packet-Switched in Optical Packet-Switched Networks Networks Hoa Le Minh, Hoa Le Minh, Fary Z Ghassemlooy Fary Z Ghassemlooy and and Wai Pang Ng Wai Pang Ng Optical Communications Research Group Optical Communications Research Group Northumbria Communications Research Lab Northumbria Communications Research Lab Northumbria University Northumbria University U.K. U.K. July, 2005
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All-Optical Header Processing in Optical Packet-Switched Networks
All-Optical Header Processing in Optical Packet-Switched Networks. Hoa Le Minh, Fary Z Ghassemlooy and Wai Pang Ng Optical Communications Research Group Northumbria Communications Research Lab Northumbria University U.K. July, 2005. Contents. Overview of processing in optical networks - PowerPoint PPT Presentation
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All-Optical Header ProcessingAll-Optical Header Processingin Optical Packet-Switched in Optical Packet-Switched
NetworksNetworks
Hoa Le Minh, Hoa Le Minh, Fary Z GhassemlooyFary Z Ghassemlooy and and
Wai Pang NgWai Pang Ng
Optical Communications Research GroupOptical Communications Research Group
Northumbria Communications Research LabNorthumbria Communications Research Lab
Northumbria UniversityNorthumbria University
U.K.U.K.
July, 2005
ContentsContents
Overview of processing in optical networksOverview of processing in optical networks
1st generation optical networks: packet routing and switching are mainly carried out using high-speed electronic devices.
However, as the transmission rate continues to increase, electronically processing data potentially becomes a bottleneck at an intermediate node along the network.
OffersOffers Novel routing table in pulse-position Novel routing table in pulse-position
modulation formatmodulation format– Small and fixed number of routing table entries Small and fixed number of routing table entries
regardless of the number of nodes in network.regardless of the number of nodes in network. High scalabilityHigh scalability
– Using simple optical configuration (SMZI).Using simple optical configuration (SMZI). Ultrahigh speed and high capabilityUltrahigh speed and high capability
– Header address matching is done readily with Header address matching is done readily with reduced size routing table.reduced size routing table.
Proposed Header Processing UnitProposed Header Processing Unit
Matching pulse(Synchronized)
HeaderExtraction
PPMConversion
PPRT
Delay fiber
Data packet
Pattern of port 1
Pattern of port 2
…
Pattern of port M
Optical AND gate 1
Optical AND gate 2
…
Optical AND gate M
All-OpticalSwitch
All-OpticalSwitch
…
Control port 1Control port 2Control port M
…
Port 1
Port 2
Port MH
Control
Synchronization
ClockExtraction
HPL Clk
Clk
OpticalHeader Processor
C[M]
HPL Clk
HPL Clk
Data Packet FormatData Packet Format
Payload Header Sync
AddressOthers
N bits
(N optical pulses)
Controls
Parity
…
Data packet:
-Optical pulses in RZ-format,
- Speed a few hundreds Gbit/s
- Each bit slot spreads from dozens to a few picoseconds
1 0 1 1 0 …
Pulse Position Modulation FormatPulse Position Modulation Format
In PPM M-bit address symbol is converted into 2M-slot symbol
A novel node architecture encooprating all A novel node architecture encooprating all optical processing with much reduced optical processing with much reduced routing table entries based om PPM was routing table entries based om PPM was proposed and simulated using VPI proposed and simulated using VPI simulation package.simulation package.
It is possible to significantly increase the It is possible to significantly increase the number of nodes in network as well as number of nodes in network as well as enlarge the size or routing table at each enlarge the size or routing table at each node without introducing large processing node without introducing large processing delay.delay.
AcknowledgementsAcknowledgements
One of the authors One of the authors Hoa Le MinhHoa Le Minh is is sponsored by the Northumbria sponsored by the Northumbria University for his PhD study.University for his PhD study.