1. Flexible Transport Networks
Steven D. Robinson VP, Product Management
Five Essential Elements of the NG Optical Network
moving from static networks to dynamic networks
What does a ROADM do? Which type is better?
Key Technologies for 3rd Generation ROADM systems
OEO vs. All Optical ROADMs
Digital ROADM Hybrid Solution
Intelligent Electrical & Optical Switching

2. Five Essential Elements of Next Generation Optical Networks
Fully Flexible Reconfigurability  Simple, Agile, Self Maintaining Systems
Pay as You Grow Scalability  Start with 1 , grow by 1  Seamless upgrade to 100G (efficiently)
Efficient Aggreg. & Switching  Integrated “ADM-on-a-blade”, BW efficient TRs Sub  switching, Carrier Ethernet Transport
Multi-Degree Operation  Both Optical & Electrical Multi-degree Options
Automated Network Planning  One time Node Engineering, GMPLS Control and Management Systems Plane & True “Point-and-Click” Provisioning
Scott
Design Networks in Minutes
ROADM
OPM O P M
Mux
ADM
Up to 16 degrees
West
East

3. Reconfigurable Optical Add/Drop Multiplexer (ROADM)
What is a ROADM?
Reconfigurable Optical Add/Drop Multiplexer (ROADM)
ROADM Module
ROADM Module
O P M
DROPs
ADDs
Key attributes of ROADM Module
Fully Flexible, Remotely Reconfigurable Optical Add Drop
Automatic power equalization on inputs, outputs, adds, drops
Optical Power Monitoring (OPM) of all channels
Key benefits of ROADM Module
Elimination of the OEO “Pass-through” tax 
Wavelength Reuse 
Scaleable Bandwidth (Start with 1 , grow by 1 )
Single Wavelength Granularity – No stranded bandwidth
Fully Automated Optical Layer

4. WDM Optical Transport Technology Options
Fixed Port ROADM
2 Degree ROADM Blocker/IPLC with fixed filters
OPM
Splitter / Drop filters
Add Filters/ Combiner O P M
WB Module
OEO Regen (Point-to-point DWDM)
Multi-Degree WSS with fixed filters
Fixed drops
OPM
Per  Optical Switch
Multi-port Mux/Demux
Fixed Adds
FOADM
Multi-Degree WSS ROADM with colorless ports
Fully Flexible Multi-degree ROADM
Per  Optical Switch
Multi-port Mux/Demux
OPM
Drops O P M
Wavelength Selective Switch (WSS) ROADM:
Utilizes a single element to multiplex AND demux all express and all add/drop wavelengths
Contains a built-in Optical Switch which can direct/select one or more wavelengths to/from any port
Provides Automated, per channel equalization on all wavelengths
Typically includes full Optical Power Monitoring on all wavelengths
Can be configured for truly colorless ports for widely tunable lasers & dynamic wavelength management
Can be modular (low first in costs) or fully installed on day one
More cost effective than the Wavelength Blocker because
MP-WSS uses a single element for mux AND demux of:
All express  s and
All Drop  s
Full functionality of ROADM included in sub-system
Enables lower system costs due to wide dynamic range equalization on all paths
Real-time OPM on all adds, drops, inputs & outputs – enabling SONET quality shared protection switching
Fully flexible add and drop ports enabling jumper-less provisioning, wavelength routing and dynamic wavelength management
Superior filter function need to enable >16nodes cascaded, low cost wavelength sources, ring interconnection and 40G compatibility
* Manages all wavelengths * Lower system cost * No OEO Pass-thru tax * Fully Flexible Ports enable:  Any  to any port  Supports Tunable lasers  Dynamic  Management  Jumper-less provisioning * Multiple wavelengths/drop port  Mesh node capability  Ring interconnection
Tunable Filter

5. Why do customers like “All optical”
Source 1 2 3
13
14
15
16
17
18
19
20
21
1-12
21
All Optical ROADM : 42 Transponders 21 12 1
ILA 21 20 19 18 17 16 15 14 13 12
All OEO or “Digital Transport”: At least 380 Transponders
ILA
In many cases, “All optical” can dramatically reduce the number of unnecessary Transponders

6. OEO or ROADM Which is the better choice?
40 Gb/s
Number of Pass-Thru Channels
Bit Rate
10 Gb/s
2.5 Gb/s
OEO
Decision depends on:
Bit Rate; Number of Wavelengths
Topology & Traffic Patterns
Switching Need (which determines # of pass-thrus vs # of drops)
Size (# nodes and span length)  Amplify? Regen?
Total Cost of Ownership (OPEX vs. CAPEX)

7. Multi-degree ROADM or OEO? Why be forced to choose?
All Optical ROADM Advantages:
Fully Bit Rate Transparent 1G  10G  100G
Per wavelength Scaleable 1  2   
Lower Power
Fully Automated Optical Layer
Low Pass-thru costs
OEO Advantages:
Sub-Wavelength Switching
Potentially Lower Terminal Costs (at full capacity)
Simpler Optical Engineering
Simpler Multi-Degree Operation
Digital ROADM Node
Multi-Degree ROADM Switch
2.5G
Per WL OEO Switch
10G
40G
100G
Multi-Degree OEO Switching

8. Digital ROADM Hybrid Node Lowest Overall Cost & Flexibility
Digital ROADM Node
2.5G
10G
40G
100G
Maintain manageable regions of transparency
All Optical ROADM
Multi-Degree All Optical ROADM
Per WL OEO Switch
Multi-Degree Digital Switching TR TR
All Optical Spur
Topology Agnostic
Traffic Pattern Agnostic
Bit Rate Agnostic
Simpler Optical Engineering
Simpler Multi-Degree Operation
Lower overall cost solution

9. Key Technologies used to Provide Flexible Transport Networks
Integrated Platforms
Rapid Automated Network Planning
Cross  Optical Switch w/ Integrated. Transport
GMPLS Control Plane
and End-to-End Management
Widely Tunable Lasers
Fully Automated Optical Layer
Hot- Pluggable SFPs & XFPs
Multi-Service ADM-on-a-blade
Integrated Carrier Ethernet Transport
True Point-and-click Planning & Provisioning
AGC / Transient Controlled Optical Amplifiers (OAs)
Integrated Optical Cabling
Flexible, Transparent Optical Interfaces
Fully Flexible WSS ROADMs
ROADM Systems provide much more than just Wavelength Reconfigurability They provide a total “Agile Optical Network” Solution

10. Flexible Networks Summary
Customers have recognized that low OPEX is now just as important as the lowest CAPEX
ROADM Modules are just one part of realizing the Next Generation Agile Optical Network
Other technologies such as automated planning tools, widely tunable lasers, optical backplanes, Pluggables, and GMPLS can dramatically simplify planning, operation & management
Selection of the right kind of ROADM is crucial to realizing these savings (Colorless Port, modular, WSS based ROADMs are the best choice)
These systems must be designed from the ground up to realize their full potential (Bolt-on ROADMs don’t work)
Digital ROADM Hybrid Solution may offer the best flexibility and lowest overall cost
MP-WSS O P M
Flexible Drops
Flexible Adds
WSS
ROADMs, optical backplanes and widely tunable lasers dramatically simplify planning & management of networks and services.
These new technologies allow operators to dynamically provision, reconfigure and power balance wavelengths with single wavelength granularity
Network management of DWDM systems has been simplified to the point where a single person can setup, provision & maintain multiple networks..
Through the use of a GMPLS control plane and a flexible port ROADM, it is now possible to remotely manage a ROADM based network enabling “true” point-and-click provisioning.
The result is a system that automates OAM&P, reduces provisioning time, more efficiently utilizes resources, increases service flexibility and substantially reduces CAPEX & OPEX.
2.5G
10G
40G
100G