Flexible Transport Networks

1. Flexible Transport Networks Steven D. RobinsonVP, Product Management srobinson@meriton.com

2. Five Essential Elements of Next Generation Optical Networks OPM ADM ADM Mux Mux ROADM O P M Design Networksin Minutes West East Up to 16 degrees • 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

3. What is a ROADM? Reconfigurable Optical Add/Drop Multiplexer (ROADM) ROADMModule ROADMModule OPM 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 2 Degree ROADMBlocker/IPLC with fixed filters WB Module Add Filters/Combiner Splitter /Drop filters O P M OEO Regen(Point-to-point DWDM) Fixed Port ROADM OPM Per  Optical Switch Multi-port Mux/Demux Multi-Degree WSSwith fixed filters OPM Fixeddrops OPM OPM FixedAdds Fully Flexible Multi-degree ROADM Per Optical Switch Multi-port Mux/Demux O P M FOADM Drops Multi-Degree WSS ROADMwith colorless ports Tunable Filter * 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

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

6. OEO or ROADMWhich is the better choice? ROADM 40 Gb/s ROADM OEO 10 Gb/s Bit Rate ROADM OEO 2.5 Gb/s 2 4 6 8 10 12 14 16 18 Number of Pass-Thru Channels 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? Multi-DegreeROADM Switch 2.5G 2.5G 10G 10G 40G 100G Per WL OEO Switch Multi-Degree OEO Switching Digital ROADMNode All Optical ROADM Advantages: • Fully Bit Rate Transparent 1G  10G  100G • Per wavelength Scaleable 1 2  . . . 40  • 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

8. Digital ROADM Hybrid NodeLowest Overall Cost & Flexibility 2.5G 2.5G 10G 10G 40G 100G • Maintain manageable regions of transparency DigitalROADMNode All OpticalROADM Multi-DegreeAll 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 True Point-and-click Planning & Provisioning RapidAutomated NetworkPlanning and End-to-End Management GMPLSControl Plane Widely TunableLasers Fully AutomatedOptical Layer Integrated Optical Cabling Integrated Platforms AGC / Transient Controlled Optical Amplifiers (OAs) Multi-Service ADM-on-a-blade Cross  Optical Switchw/ Integrated. Transport Hot- Pluggable SFPs & XFPs Flexible, Transparent Optical Interfaces Integrated Carrier Ethernet Transport 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 2.5G 2.5G 10G 10G 40G 100G O P M MP-WSS WSS Flexible Drops Flexible Adds • 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 GMPLScan 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