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