Networking in DWDM systems
Zero Touch PhotonicsZero Touch Photonics
Péter BartaAndrás Kalmár7-9. of April, 2010 - Debrecen
All Rights Reserved © Alcatel-Lucent 20102 | Zero touch photonics | April 2010
Outline
Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
All Rights Reserved © Alcatel-Lucent 20103 | Zero touch photonics | April 2010
Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
All Rights Reserved © Alcatel-Lucent 20104 | Zero touch photonics | April 2010
Transformation Drivers for Photonic Networks
VoIP
Enhanced Internet ServicesTriple Play
bundle
IPTV(incl. HDTV, VoD)
Blended, personalized
voice,video& data
services
2000 2005 today Coming soon
MoreBandwidth
!New services (and new players) are emerging, requesting huge bandwidth growth in photonic networksn Fixed and mobile, personalizedn Increased popularity of new Video and Internet
applications (> 6 x growth between 2004 and 2008)
Service providers are facing new challengesn React faster, providing better time-to-service□Higher flexibility and capacity
n Control costs□Highly automated operations and resilience
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Challenges
Increased traffic demands mean:n Significant growth of the number of the services to deploy within the
WDM network (more and more difficult to handle, to administrate, etc.)
n More dynamic nature of the servicesn More diverse end points of the services
To meet these challenges networking approach shall be introduced in the DWDM networks instead of the static systems deployed today.
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Static Networks Based on fixed Wavelength filters
Typical WDM Network today HUB
Ch 1-8Ch 1-8
Ch 25-32Ch 25-32
Ch 17-24Ch 17-24Ch 9-16Ch 9-16
Ch 1
-8Ch
1-8
Ch 2
5-32
Ch 2
5-32
Ch 1
7-24
Ch 1
7-24
Ch 9
-16
Ch 9
-16
OADM
OADM
OADM
OADM
Physical WDM Ring
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Static Networks Based on fixed Wavelength filters
n Topology and capacity/node determined at time of network design□ Traffic projection based upon best estimates at the time□ Frequent changes even during design/bid/deployment□ Not always cost effective to modify the system
n Can lead to premature system exhaust□ Expected system life time: 5 – 10 years□ No accurate traffic projections available for such a long period□ Insufficient No. of wavelengths available to hot spots□ Unlit wavelengths to cold spots cannot be utilized
n Topology is inconsistent for emerging applications□ Telephony, SAN, Enterprise, VoIP topologies looks different
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Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
All Rights Reserved © Alcatel-Lucent 20109 | Zero touch photonics | April 2010
Automation
Eliminates manual
intervention
Performance
Eliminates regeneration
points
Integration
Eliminates multiple
equipment
§ True Networking
§ Wavelength management and switching
§ OAM and Survivability
§ Reduced TCO
§ Improvedtime-to-service
Flexibility
Eliminates need to forecast traffic
Zero-Touch Transparent Photonic Networks
Multi-degree, Gain Equalization, New modulation formats, 40G/100G, Raman, …
C+DWDM, multi-reach, GE ADM, L2 switching, …
MultidegreeMeshedROADM, tunable lasers and filters, …
Auto power adjust., GMPLS/ASON restoration, OTH, smart photonic manager, …
Transforming WDM Networks
Zero-Touch Transparent Photonic Networks transform WDM into true transport networking for simplified and accelerated operations
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§Wavelength routing at intermediate nodes
ROADM § Increased connectivity (mesh)
§ Color-less ports
§Multicasting
§Wavelength routing e2e
§ Path, QoS, power monitoring
§Misconnections management
Multi-degree
TOADM –
Full Tunability
E2E Traffic Management § GMPLS/ASON
§ Re-coloring
Photonic Restoration
§ Full Automation
§ Low cost-per-bit photonic bandwidth resilience, no blocking, more resources
§ Complement digital survivability (TDM/OTN, packets)
TouchTouch--less, flexible networking layer for TCO control less, flexible networking layer for TCO control
§ Full Operations
§ Touch-less design, planning and operations
§ NOC based automated commissioning, supervision and operations
§ Full Flexibility
§ Simple design, planning (highly reduced blocking), operations and inventory
§ No need to go to sites
§ Easier design
§ Still need to go to sites for the add/drop
§ Still need to go to sites for the add/drop
WSS T&ROADM Unique ArchitectureTraditional ROADM Architecture
WSS: Wavelength Selective Switch; T&ROADM: Tunable ROADM
Technology Enablers for Zero-Touch Photonic NetworkingBeyond Multi-Degree ROADM
Wavelength Tracker
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Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
All Rights Reserved © Alcatel-Lucent 201012 | Zero touch photonics | April 2010
More transparent directions:è less OEO and sub-λ switching
Flexibility: a key enabler
add drop rerouteè restoration
Tunable ROADMwest east
Color-independent add drop:Any color to any port
ROADMwest east
colored add drop
Automated network provisioningand system tuning
Ease network operation
Improve network resilience
Route-fixed add drop
Route-fixed add drop
Degree-N
Degree-N
Gbit/km cost reduction
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TOADM architecture
WSS
Filter (East)THRU
WDM IN
AMP IN
AMP OUT(Optional)
WDM IN
AMP OUT(Optional)
AMP IN
Filter (West)
WSS
Transponder
Transponder
Transponder
Transponder
8 Colorless ports 8 Colorless ports
…Scalable TOADM/ROADM/N…Scalable TOADM/ROADM/N--degree node architecture… degree node architecture…
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N-Degree DWDM node architecture
WSS
Filter (East)THRU
WDM IN
AMP IN
AMP OUT(Optional)
WDM IN
AMP OUT(Optional)
AMP IN
Filter (West)
WSS
Xpdr
WSS
Filter (North)THRU
WDM IN
AMP IN
AMP OUT(Optional)
WDM IN
AMP OUT(Optional)
AMP IN
Filter (South)
WSS
Xpdr
XpdrXpdr
Xpdr
Xpdr
XpdrXpdr
SFD44
SFD44SFD44
SFD44
6 colorless portsBB port
BB port
BB port
BB port
6 colorless ports
6 colorless ports 6 colorless ports
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T&R-OADM: value proposition
Benefits of the Tuneable add-drop functionality:1. Set-up or re-engineer a circuit within minutes□ Non-tuneable ROADMs avoids intervention at intermediate sites, but still require
intervention at circuits endpoints□ Tuneable architectures remove intervention at circuits endpoints (provided that
transponders are available)
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The need: re-engineering a circuit
A
B C
D
Initial link set-up: existing circuits A-D and B-C
New need: change circuits to A-C, B-D
TR-OADM TR-OADM TR-OADM TR-OADM
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Standard approach: non-tuneable ROADM
A
B
D
Non-Tuneable ROADM architecture:
n Go to site D, and change transponder cabling
n Go to site C, and change transponder cabling
n Activate new service
C
R-OADM R-OADM R-OADM R-OADM
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Tuneable ROADM: re-engineering a circuit within minutes
A
B C
D
Tuneable ROADM architecture:n Just re-program your DEMUX ports, no site intervention needed!
TR-OADM TR-OADM TR-OADM TR-OADM
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T&R-OADM: value proposition
Benefits1. Set-up or re-engineer a circuit within minutes□ Non tuneable architectures avoid intervention at intermediate sites, but
require still intervention at circuits endpoints□ Tuneable architectures allow to avoid intervention at circuits endpoints
(provided that transponders are available)2. Make channel planning unnecessary□ All items are “colorless”, i.e. not associated to a specific wavelength
All Rights Reserved © Alcatel-Lucent 201020 | Zero touch photonics | April 2010
T&R-OADM value proposition:Make channel planning unnecessaryInitial traffic plan:n Dual homed traffic matrix with minimum frequency usage
A B C D E F
New need:n Install a new service A-B and B-F, A-C and C-F...
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Non-tuneable ROADM:n Deploy new set of MUX/DEMUX, as the green MUX-DEMUX channels are fully used
A B C D E F
Fixed-color add/drop ports
NON-tuneable MUX/DEMUX
T&R-OADM value proposition:Make channel planning unnecessary
Non TunableR-OADM
Non TunableR-OADM
Non TunableR-OADM
Non TunableR-OADM
Non TunableR-OADM
Non TunableR-OADM
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Tuneable ROADM:n Just re-program the tuneable MUX ports to any color in the C+ band
A B C D E F
Unprogrammed ports
Programmed ports
Tuneable MUX/DEMUX
T&R-OADM value proposition:Make channel planning unnecessary
TR-OADM TR-OADM TR-OADM TR-OADM TR-OADM TR-OADM
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Simulation:n Ring networkn Any-to-any traffic:
Random traffic evolution, from 1 to max capacity,
n New channel assignment decided at each step without any knowledge of the future demands
Graph:n X-axis: # of nodes in the ringn Y-axis: MUX port utilization
in %, at full-channel loading
Number of nodes in the ring
MU
X po
rt u
tiliz
atio
n (%
) T&R-OADM
Non-tuneable R-OADM
T&R-OADM up to 3.5 times more efficient than
non-tuneable R-OADM !
T&R-OADM value proposition:Make channel planning unnecessary
All Rights Reserved © Alcatel-Lucent 201024 | Zero touch photonics | April 2010
T&R-OADM: value proposition
Benefits1. Set-up or re-engineer a circuit within minutes□ Non tuneable architectures avoid intervention at intermediate sites, but
require still intervention at circuits endpoints□ Tuneable architectures allow to avoid intervention at circuits endpoints
(provided that transponders are available)2. Make channel planning unnecessary□ All items are “colorless”, i.e. not associated to a specific wavelength
3. Dramatically simplify logistics□ Reduce the lead-time to define an order (no longer any need to check the
installed base)□ Eliminate possibilities of errors when ordering new items
(wrong transponders and MUX colors is a typical cause of errors)□ Simplify and optimize spares management
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CAPEX benefits:Degree-N transparency
European national network
AVERAGE NODECONNECTIVITY = 3.1
Source: Alcatel-Lucent study
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
APE 14 spans APA 20 spans
WB/WSSAmplifierMUXTPD
Transparentdegree-N
OOO nodes
Degree-2ROADMs
-28%
With O-SNCP protected traffic
Network studies show ~30% CAPEX savings with Transparent OOO nodes
Map of physical links and traffic demands
Remove external nodes (e.g. SDH, Routers,..) for Ring Interconnections
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The local OTS ports represents the ultimate flexibility:•local add/drop traffic is not dependent on any specific direction•Paths can be provisioned in the photonic domain
•The enabler for photonic restoration !
The next step: Wavelength rerouting to increase the overall network reliability with T&ROADM:
1
2
3
L
Local OTS Port: Towards photonic transparent networks
Direction 2
pool of regenerator on local OTS port can beaccessed dynamically for
new connections
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Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
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Colored, direction dependent nodes (ROADM network) / 1
nInitial path configuration
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Colored, direction dependent nodes (ROADM network) / 2
Remote cfg on intermediate
nodes
NMS
nRerouting for maintenance activity
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Colorless, direction dependent nodes (TOADM) / 1
nInitial network condition
λ1
λ1
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Colorless, direction dependent nodes (TOADM) / 2
nRerouting for maintenance activity with wavelength reallocation
λ1
λ2
λ1 à λ2Solving possible
wavelength contention issues
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Colorless, direction dependent nodes (TOADM) / 3
nRerouting for maintenance activity with wavelength reallocation
λ1
λ2
λ1 à λ2Solving possible
wavelength contention issues
Remote cfg on intermediate
nodes
NMS
Remote wavelength
reconfiguration
NMS
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Colorless, directionless nodes(TOADM) / 1
λ1
λ1
nRerouting for maintenance activity
nInitial network condition
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Colorless, directionless nodes(TOADM) / 2
λ1
λ1
λ1
Remote cfg on intermediate
nodes
NMS
nRerouting for maintenance activity
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OChNE
Automated photonic layer: GMPLS for fast service setup (BW-on-Demand), restoration…
Switched Connection restoration supporting multiple failures
GMPLS
RSVPRSVP--TETE
RSVPRSVP--TETE
UNI
OOO Transparent OOO Transparent DomainDomain
UNI UNI
UNI
OChNE
OChNE
OChNE
OChNE
IP/MPLS router
Multi-Service XC
degree-N nodeOChNE
Source-based restoration mode : photonic routing engine for optical route
choice
n Faster service setupn Automatic restorationn High level of resiliencen Good resources usagen Automated discovery
Automatic check Optical Path (direct or
regen)
GMPLS benefits:
All Rights Reserved © Alcatel-Lucent 201036 | Zero touch photonics | April 2010
Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
All Rights Reserved © Alcatel-Lucent 201037 | Zero touch photonics | April 2010
The boundary condition: Spectral efficiency is keyNetwork capacity is growing
à Higher spectral efficiency ?
à Wider amplification bands ?
à Light another fiber ?
à What is lowest cost ?
Support legacy systems
à 50-GHz channel spacing
à Multiple ROADMs
Trade regeneration cost with transparent reach
à Cost / complexity of transponders
à Optically-routed network impairments: ROADMs, PMD, CD, Nonlinearities
[Magill, LEOS’07]
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Scalability:100 Gigabit Ethernet transport
Moving to 100GE is to increase capacity, soèLink capacity needs to be increased accordingly*èIn core networks, scalability of fiber links clearly advocate for
higher spectrum efficiency and single wavelength solution with sophisticated modulation format.
§ Historically at 2.5G, typ. 32ch: 0.025 b/s/Hz (100 GHz)§ Typ. now at 10G: 0.2 b/s/Hz (50 GHz grid)§ Typ. now at 40G: 0.8 b/s/Hz (50 GHz grid)
§Target for 100G: better spectral efficiency compared to 40G§ ~2 b/s/Hz is achievable (50 GHz grid)
Status:§ Substantial market interest for 100G§ Alcatel-Lucent Technology leadership including standards development
*Reminder: today’s typical link
capacity is ~1 Tbit/s (100x10G)
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Drivers
Flexibility and transparency benefits
n Tunable ROADM (Reconfigurable Optical Add/Drop Multiplexer)
n N-Degree T-ROADMs (N-Directions)
n Optical resilience and restoration
n System automation
System scalability
Management & planning
All Rights Reserved © Alcatel-Lucent 201040 | Zero touch photonics | April 2010
Wavelength Tracker™
Encode/Decode Points
= Wavelength Tracker Detection PointTransponder
= Wavelength Tracker Insertion Point
Filter (East)
A
THRUWDM IN
AMP IN
AMP OUT(Optional)
Filter (West)
AWDM IN
Transponder
AMP OUT(Optional)
AMP IN
ADD/DROP
v Each channel is encoded with a unique WaveKey pair that allows the channel to be identified and its power monitored.
v WaveKeys are encoded onto the channel at each Transponder and act as “Optical J0” Trace Identifiers.
v The assignment of WaveKeys is managed by the NEs, which maintain a database of the WaveKeys used in the network.
v Wavelength Tracker WaveKeys are detected on the following cards:§ Amplifiers§ Wavelength Routers
v At each detection point, the WaveKeys are detected and their power measured.
All Rights Reserved © Alcatel-Lucent 201041 | Zero touch photonics | April 2010
Wavelength Tracker™Optical Power Management
ServiceService--aware management of the optical layeraware management of the optical layer
Features:v Wavelength path tracev Fault sectionalization & isolationv Remote optical power controlv Threshold alarmingv Automated fault correlation
Optical Fiber ViewManagement of all wavelength on a
selected fiber
Optical Path ViewManagement of all points along one
wavelength
All Rights Reserved © Alcatel-Lucent 201042 | Zero touch photonics | April 2010
Integrated Alcatel-Lucent Solution: Greater intelligence, Accelerated deployments
Planning ToolPlanning Tool
Plan Deploy
Manage
n Equipment configuration automatically generatedn User-friendly interface with graphical views of the network
n Current configuration is imported to LPT to support upgrade of existing design
n Validated network design exported to NMS
Network ManagementNetwork Management
n Graphical toplogical viewnEnd to andnService awarness
All Rights Reserved © Alcatel-Lucent 201043 | Zero touch photonics | April 2010
Conclusion
Zero-Touch Transparent Photonic Networks help service providers to:n Ease operations□Tunable ROADM, to ease commissioning□Flexible nodes, to provision/reconfigure and tune remotely
n Reduce costs□Cost-effective scalable Multi-degree ROADMs enable transparent transits
n Improve network resilience□Photonic restoration□Supporting multiple failures in addition to fast electrical/client protection
n Cap existing, future-proof investments□Photonic switching to support variable grid and channel bandwidth□Future-compatible (40G/100G ready) and backward-compatible
n Ensured operation□Wavelength TrackerTM and graphical end to end management allow fast and
accurate reactions
All Rights Reserved © Alcatel-Lucent 201044 | Zero touch photonics | April 2010
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