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Evaluating efficiency of multi layer switching in future optical transport networks
1. 1 | Infinera Confidential & Proprietary
Evaluating Efficiency of Multi-
Layer Switching in Future
Optical Transport Networks
Anuj Malik, Soumya Roy, Abhijeet Deore, Onur Turkcu,
Satyajeet Ahuja, Steven J. Hand and Serge Melle
OFC 2013
2. 2 | Infinera Confidential & Proprietary
Carriers Need More Capacity
Drivers
Video
Mobility
Cloud
3. 3 | Infinera Confidential & Proprietary
Core Network
Traffic Demands and Patterns
Customer
Data
Center
High Proportion of <100G
demands (1/2.5/10G)
Mesh Traffic Patterns
More and More Express Traffic
Digital Switching
Optical Switching
4. 4 | Infinera Confidential & Proprietary
Multi Layer Switching
Combines Best In Class Optical and Digital BW management
ROADM
Optical BW Management
Photonic Integration for pervasive
digital grooming/switching
Unconstrained sub-l digital
switching
ODU0/ODUflex switching
granularity
Reconfigurable optical
switching
Dynamic add/drop/express for
optical channels
Reconfigurable optical switching
for OpEx Savings
Dynamic add/drop/express for
optical channels
Unconstrained sub-l digital
switching
ODU0/ODUflex switching
granularity
Wavelength level Protection
Digital BW Management
ROADM
Optical BW Management
Digital BW Management
Optical BW Management for
Super-Channels
Photonic Integration for pervasive
digital grooming/switching
Unconstrained sub-l digital
switching
Reconfigurable optical
switching for OpEx Savings
Dynamic add/drop/express for
optical channels
Wavelength Level Protection
6. 6 | Infinera Confidential & Proprietary
26,629 km fiber network
60 total add/drop nodes
• 17 Tier 1
• Includes 8 data center nodes
• Includes 2 dual POP sites (London,
Paris)
• 26 Tier 2 cities
• 17 Tier 3 cities
• 238 optical line amplifier sites
Representative of typical
long-haul collector network
• “Carrier’s carrier” service provider
• Tier 1/PTT national long-distance
international network
Pan-European Long-Haul Network
Fiber Type Fiber Distance
(km)
Number of
Spans
E-LEAF 17689 215
Silica Core 486 3
SMF28 7826 93
TWRS 627 8
Total 26629 319
7. 7 | Infinera Confidential & Proprietary
3-tier service demand model
• Gravity model for A-Z demands
between all city-city pairs
• Overlay data traffic from data centers
• Overlay international traffic from
trans-oceanic cables
Service demands across range
of interface rates: 1G, 2.5G,
10G, 40G and 100G
Average 57% growth per
period over 5 periods
Final traffic volume of 55Tb/s
• 4Tb/s average capacity per WDM link
Pan-European Long-Haul Collector Network
ServiceDemandAssumptions
Network Traffic Volume (Tb/s)
TotalTrafficVolume(Tb/s)
0
10
20
30
40
50
60
Period 1 Period 2 Period 3 Period 4 Period 5
9 Tb/s 26 Tb/s 55 Tb/s
100G
40G
10G
2.5G
1G
Service I/F
17 Tb/s 39 Tb/s
8. 8 | Infinera Confidential & Proprietary
Benefits of Multi Layer Switching
CAPEX Reduction: 13-22% less number of 100G ports
Digital Switching
More efficient with less filled
demands
Optical Switching
More efficient with fully filled
demands
Multi Layer Switching
Combines benefits of both
digital and optical switching
9. 9 | Infinera Confidential & Proprietary
Beyond 100G - Super-channels
LINE
MODULE
Delivers excellent
optical performance
Must be provisioned in a
single operational cycle
Operational
Scale
Fiber
Capacity
Next Gen
Services
Super-channels are an evolution in DWDM in which
several optical carriers are combined to create a
composite signal of the desired capacity
10. 10 | Infinera Confidential & Proprietary
Super-Channel vs. 100G Switching Architecture
Fewer Components, Less Space
Fewer Fiber Connections, Less Complex
More Capacity and Scalability
Super-Channel ROADM
West East
North
South
WSS
WSS
Transponder
Transponder
Transponder
Add/drop
Transponder
19 Line Modules
48 Patch Fibers*
2.5 Bays
West East
North
South
Add/drop
Transponder
Transponder
Transponder
WSS
WSS
Transponder
Transponder
100G ROADM
Transponder
Transponder
Transponder
96 Line Modules
136 Patch Fibers*
4+ Bays
*4-way Colorless ROADM Node, 8Tb/s WDM capacity per direction, 50% Add-Drop
11. 11 | Infinera Confidential & Proprietary
Benefitsof Super-ChannelBased Switching
7-29% Additional Network
Service Ready Capacity
with Super channels
Provisioned Capacity
OPEX Reduction – Fewer components,
faster deployment time
Additional Service Ready Capacity
12. 12 | Infinera Confidential & Proprietary
Conclusion
Multi Layer Switching
- Combines the benefits of Digital and Optical Switching
- Provides CAPEX and OPEX benefits with BW growth
Super-Channel Level Switching
- Offers significant OPEX benefits with additional service
ready capacity