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Transcript of Evolving Metro/Regional ROADM Architectures to ... - … Tellabs 2013... · Evolving Metro/Regional...
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Evolving Metro/Regional ROADM
Architectures to 400G and beyond
ECOC Market Watch
London
September 2013
Paul Momtahan
Director of Transport Solution Marketing
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Evolving Metro/Regional to 400G Agenda
Metro/Regional Market Drivers
Moving beyond 100G
ROADM Architecture
Evolution
Cost Effective CDC for the Metro
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Metro/Regional Market Drivers Traffic Growth & 100G
Worldwide Annual Growth in Traffic Volume on Metro Networks
% of Respondents
Operator Timelines for Wide-Scale Metro 100G Deployment
% of Respondents
Source: Metro Packet-Optical Transport 2.0 Survey, Heavy Reading, March 2013
Traffic growth is driving operators to start adopting 100G in the metro
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Metro/Regional Market Drivers Inter-Data Centre Traffic
Inter-data centre traffic is growing at >30% CAGR
32
44 45
57 62
0
10
20
30
40
50
60
70
Amsterdam Frankfurt Paris NYC London
# o
f C
olo
ca
tion D
ata
centr
es
Inter-data centre traffic is likely to drive the need for higher speed lambdas in the metro
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Metro/Regional Market Drivers Metro vs. Long Haul
Local
Exchange
Hub Office
Metro / Regional
Long Haul
Consumer: Hubbed & Asymmetrical
Enterprise: Some meshed, more symmetrical
nX 10Gs
Short distances
Few OLAs
Traditional Metro Consumer/Enterprise
Meshed
Symmetrical Traffic
nX 100/400Gs
Long Distances
Numerous OLAs
Core Network Hub to Hub
Meshed
Symmetrical
nX 100/400Gs
Short distances
Few OLAs
New Metro Layer Data Centre to Data Centre
Will have 10G, 100G and 400G
Focus on Flexibility and Cost
Coherent Only
Performance & Flexibility
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Moving beyond 100G 16QAM & Superchannels
16QAM doubles spectral efficiency but is at least four times more sensitive to OSNR
– Technology is limited to 30Gbaud today, thus requiring 2x200Gbps for 400G
16QAM
4x100Gb
137.5 GHz
2x200Gb
75 GHz
1x400Gb
75 GHz 100
Gb
50 G
Hz
100
Gb
50 G
Hz
100
Gb
50 G
Hz
Superchannels & Flexgrid
Superchannels and flexgrid enable a further 33% boost in spectral efficiency by combing two
200Gbps lambdas in 75Ghz
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Moving beyond 100G Impact of 10G on 16QAM
The metro is still dominated by 10G however 16QAM is severely impacted by crosstalk (i.e. XPM) from 10G
0 2 4 6 8 10
With 10G & DCMs
Coherent Only
# of 40km/10dB spans (ROADM cascades)
400G (2x200G) reach with 3dB margin
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ROADM Architecture Evolution Broadcast & Select
SPLITTER
SPLITTER
SPLITTER
SPLITTER
SPLITTER
Broadcast & Select has been the dominant architecture for multi-degree ROADM
WSS
WSS
WSS
WSS
WSS
As the number of degrees
increases so does the
splitter loss, lowering OSNR
WSS Isolation:
Non-selected channels leak
through and create cross talk
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ROADM Architecture Evolution Route & Select
Route & Select does not suffer from splitter scaling or WSS isolation problem
WSS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
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ROADM Architecture Evolution 400G Reach: Route & Select vs. Broadcast & Select
If we get rid of 10G and Dispersion Compensation, Broadcast and Select can
deliver 400G performance comparable with Route & Select
However as the number of degrees (size of splitter & WSS) increases Broadcast &
Select performance will degrade
Amplifier OSNR Broadcast & Select Isolation (20D ROADM)
Route and Select
R&S has better 400G performance as # of degree scales
16
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ROADM Architecture Evolution Broadcast & Select vs. Route & Select Broadcast & Select Advantages
– Cost-effective (1xWSS per Degree)
– Filter narrowing (1xWSS per pass-through) - No longer an issue with next gen WSS
– Support for optical Broadcast/Multicast schemes
– Good 400G performance if no 10G/DCMs and degree count is not too high
Route & Select Advantages
– No loss in splitter (advantage for 400G & high-degree ROADM)
– No leakage from non-selected channels at egress (advantage for 16QAM/400G)
– Scales to support high degree counts (mesh, CD/CDC) without impacting 400G performance
00.20.40.60.8
11.21.41.61.8
B&S, no CD R&S with CD R&S with CDC
Recent Tellabs Study on North American metro
Rela
tive C
ost of O
ptical Layer
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Add/Drop Number of Degrees (DWDM Line)
Directionless Colourless Contention-less 2D 4D 6D 8D 10D >10D
ROADM Architecture Evolution ROADM Decision Criteria for 400G
Drivers for colourless & directionless:
– Layer 0 Restoration
– Network Defragmentation/Optimisation (SDN)
– Fast Provisioning (pre-installed transponders)
Drivers for contention-less:
– Minimises blocking in highly loaded network
– Network blocking not node contention is likely to be the main source of blocking in metro networks
Drivers for more DWDM line degrees
– Meshing in the metro, extending to access
– C&D (each directionless eats a degree)
– CDC (max 16 add/drop ports per “degree”)
Add/Drop Number of Degrees (DWDM Line)
Directionless Colourless Contention-less 2D 4D 6D 8D 10D >10D
Add/Drop Number of Degrees (DWDM Line)
Directionless Colourless Contention-less 2D 4D 6D 8D 10D >10D
Broadcast & Select
Route & Select
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Cost Effective CDC for the Metro High Port Count MCS
MCS MCS MCS
16 Add/drops
degree 1 degree 2 degree 8
Scalable
– 16 add/drops per WSS port
High loss across MCS
– EDFA array required
– 2xEDFA for each degree (input & output)
– 16xEDFA for eight degree system
Decreased Performance
– EDFAs add noise
– Mixing of 16 sources (SMSR)
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Cost Effective CDC for the Metro Low Port Count MCS
MCS MCS MCS
4~8 Add/drops
degree 1 degree 2 degree 8
Cost per add/drop port drops by 30%~50%
– Reduced loss across MCS
– Enables EDFAs to be eliminated
Better performance:
– No noise from EDFA
– Mixing of fewer add/drop sources
Less scalable
– Eats up WSS ports more quickly
Increased WSS cost?
Requires more expensive
high port count WSS for DWDM Line
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Cost Effective CDC for the Metro Tellabs Metro CDC Study
LPC MCS is more cost-effective than HPC MCS unless # of wavelengths
increases dramatically
– 100G and 400G are likely to depress the number of wavelengths
CDC with LPC MCS can even be lower cost than CD only (with R&S)
Scale of demands (1=current wavelengths)
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Evolving the Metro to 400G Summary
Hub Office
Metro / Regional
• Stick with 10G friendly solution
• Stick with B&S
• Focus on low cost
Traditional Metro Consumer/Enterprise Delivery
• Deploy Overlay 100G/400G friendly
optical Layer
• All Coherent
• Choose between B&S for cost
effectiveness and R&S for flexibility
• LPC MCS is likely to be the most cost-
effective option for CDC – could even be
less expensive than CD only
New Metro Data Centre to Data Centre
Cloud & Virtualization have resulted in an explosion of horizontal
traffic between data centres, creating two completely separate
traffic profiles in metro networks
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