Transcript
WAVELENGTH ROUTING TESTBEDS
WAVELENGTH ROUTING TESTBEDS
Africa ONE/Sea ME We-3 AON (All Optical Network Consortium) NTT Ring MWTN(Multi wavelength transport network) ONTC(Optical network technology consortium) MONET Alcatel’s WDM ring
Name Architecture Topology Router ports
Wave lengths
Channel Spacing
(nm)
Bit RateIn Gb/s
Distance
MWTN OWXC Ring /mesh 4 4 4 0.622 230
AON Static Star 8 0.4 0.4 2.5 100
ONTC OWXC Linked rings 2 4 4 0.155 150
NTT OADM Ring 2 0.8 0.8 0.622 120
Alcatel OEADM Ring 2 1.6 1.6 2.5 160
MONET OWXC Mesh/ring 4 1.6 1.6 10 2000
NTONC OADM Dual ring 2 4 4 2.5 700
COBNET EWXC/OXC Ring Many/2
12 1.6
PHOTON OWXC Mesh 2 8 3.2 2.5/10 500
METON OWXC Mesh/ring 4 6 3.2 0.62/2.5 230
Architecture of Africa ONE
Hub node
1 2 7 8
Hub node
Undersea plant
OADM
Access Nodes
………
λ1 λ2 λ2 λ1
Λ5, Λ6, Λ7, Λ8,
Africa one
• Over all ring length 40,000km• 2 fiber pairs• Hub nodes – central offices• Access nodes – Cable stations• 8 OADMS in underwater link• Protection: if there is a fiber cut on link between
two hub nodes , the access nodes between two hubs can still reach one of the hub nodes
Africa ONE node structure
AON (All-optical Network Consortium)
• Static Wavelength Routing testbed• Level 0 –LAN, Level 1- MAN• 20 wavelengths spaced 50 GHz • Odd numbered wavelengths are used in level 0• Even Numbered wavelengths are used in level 1• A service – Simple circuit switched light paths • B service – Circuit switched service provides pre assigned
time slots on light path• C Service – Datagram service , runs as broadband
Ethernet
AONEnd
Node
End Node
End Node
End Node
End Node
Bypass filter
Bypass filter
AWG
End Node
End Node
Level 0
Combiner
Combiner
Splitter
Splitter
Level 1DEC
MIT campus
• Unidirectional Ring• One Hub node, Many Access nodes• Protection:
1. If Working fiber is lost, protection fiber will loop the traffic
2. 1+1 path protection – where same traffic is sent on both the working and protection fibers in opposite directions
NTT Ring Testbed
NTT Ring Testbed
Access node 2
Access node 1
Hub Node
Protection fiber
Working Fiber
λ1λ2λ3λ4λ4λ3λ2λ1
λ1λ1λ2λ2
NTT Ring Testbed
Access node 2
Access node 1
Hub Node
Protection fiber
Working Fiber
λ1λ2λ3λ4λ4λ3λ2λ1
λ1λ1λ2λ2
NTT Ring Testbed 1+1 pathprotection
Access node 2
Access node 1
Hub Node
Protection fiber
Working Fiber
λ1λ2λ3λ4λ4λ3λ2λ1
λ1λ1λ2λ2
NTT Ring Testbed
Access node 2
Access node 1
Hub Node
Protection fiber
Working Fiber
λ1λ2λ3λ4λ4λ3λ2λ1
λ1λ1λ2λ2
Node Architecture of NTT Testbed
OADM
OADM
Loop back
Coupler
Switch
EDFA EDFA
EDFA EDFALevel equalizer
Protection Fiber
Working Fiber
Receivers Transmitters
Loop back
Coupler
Switch
Switch
MWTN (Multi-wavelength Transport N/W)
• Channel selection is done by electronic thin film based filters
• Channel powers were equalized using separate attenuators for each channel
• ProtectionEach wavelength carry a pilot tone used
to detect and solve failure
MWTN Optical Cross Connect
Switch
Switch
Switch
::
Receivers
Monitor
Transmitters
Attenuators
MWTN optical add/drop multiplexer
Transmitter Receiver
OADM
Switch Switch
Monitor Monitor
Monitor
MonitorEDFA
Monitor
ONTC (Optical Network Technology Consortium)
• 4 wavelengths• EDFA after each node to compensate failures• Each node has 10-dB coupler
ONTC
OXC
OADM
OADM OADM
OADM
Access Node
Access Node Access Node
Access Node
OADM and an Access node in ONTC
ATM Switch
Receiver Array Transmitter Array
Switch
Switch
Switch
Switch
λ1
λ2
λ3
λ4
MONETOADM OADM
OADM
OADM
OADMOADM
OADM
OADM
OXC
Transmitters
Receivers
OADM
OADM
OADM
Bell core Local exchange Testbed
AT&T Lucent long distance Testbed
ALCATEL’s OADM
Working Fiber
Protection Fiber
Working Fiber
Protection Fiber
Filter Switch OEO
OEO
Coupler
DataData
…… ……
Filter Switch
Filter
Filter
Transmitters
Receivers
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