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Reconfigurable Optical Networks using WSS based ROADMs Steven D. Robinson VP, Product Management [email protected] 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 Five Essential Elements of Next Generation Optical Networks Reconfigurability Simple, Flexible, Self Maintaining Systems Pay as You Grow Scalability Start with 1 , grow by 1 Seamless upgrade to 100G (efficiently) Aggregation & Sub- Switching Integrated “ADM-on-a-blade”, High BW efficiency Multi-Degree Operation Both Optical & Electrical Multi-degree Options Automated Network Planning One time Node Engineering, GMPLS Control Plane & True “Point-and-Click” Provisioning and Management Systems ROADM OPM O P M ADM ADM Mux Mux Design Networks in Minutes West East 1 Confidential Up to 16 degrees 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 Scaleable Bandwidth (Start with 1 , grow by 1 ) Single Wavelength Granularity – No stranded bandwidth Fully Automated Optical Layer 2 Confidential WDM Optical Transport Technology Options WB Module Add Filters/ Combiner O P M Splitter / Drop filte rs 2 Degree ROADM Blocker/IPLC with fixed filters OPM Fixed Port ROADM Per OEO Regen Optica Multi-port Mux/Demux l Switc h OPM (Point-to-point DWDM) Multi-Degree WSS with fixed filters OPM Fixed drops Per FOADM Fixed Adds Optical Swit ch Multi-port Mux/Demux OPM O P M Fully Flexible Multi-degree ROADM Drops Multi-Degree WSS ROADM with colorless ports 3 Confidential Which ROADM Technology is best? Full Flexible, WSS based ROADMs 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 MP-WSS WSS Key * Manages all wavelengths Features: * Lower system cost * No OEO Pass-thru tax O P M * Fully Flexible Ports enable: Any wavelength to any port Flexible Drops Flexible Adds Supports Tunable lasers Dynamic Management 1 3 4 5 + 7 Jumper-less provisioning * Multiple wavelengths/ drop port ROADM MODULE Mesh node capability Ring interconnection 4 Confidential Key Technologies used in Core Reconfigurable Networks True Point-and-click Planning & Provisioning Rapid Automated Network Planning and End-to-End Management GMPLS Control Plane Fully Flexible WSS ROADMs Widely Tunable Lasers Fully Automated Optical Layer Integrated Platforms Multi-Service ADM-on-a-blade Flexible, Transparent Optical Interfaces Integrated Optical Cabling Cross Optical Switch w/ Integrated. Transport AGC / Transient Controlled Optical Amplifiers (OAs) Hot- Pluggable SFPs & XFPs Ethernet Networking ROADM Systems provide much more than just Wavelength Reconfigurability They provide a total “Agile Optical Network” Solution 5 Confidential Why do customers like “All optical” Source 1 2 3 13 14 15 16 17 18 19 20 21 21 1-12 All Optical ROADM : 42 Transponders 12 1 1 1 1 1 1 1 1 1 21 ILA All OEO or “Digital Transport”: At least 380 Transponders 21 20 20 19 19 18 18 17 17 16 16 15 15 14 14 13 13 12 12 ILA 7 OEO becomes more expensive as the node count goes up (# Regens x # nodes) OEO becomes more expensive as the number of wavelengths increases (# WL x # Regens x #nodes) Use of Analog Optical Amplifiers lowers cost – unless you need to drop traffic 6 Relative Cost, $ 21 5 4 3 2 1 0 All Optical All OEO 6 Confidential OEO or ROADM Which is the better choice? Bit Rate 40 Gb/s 10 Gb/s ROADM ROADM OEO 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) Confidential 7 Integrated OEO (Digital Transport) Multi-Service & Investment Protection Issues Integrated Tx 10 x 10G Integrated Rx OEO Regen OEO Regen OEO Regen OEO Regen 100% 90% 80% 70% 60% 50% 40% 4 x 10G 30% 20% 10 x 10G 10% 0% ATM ESCON FC1 GbE FC2 OC-48 10G 40G 100G Integrated 10G OEO: Optimized for 10G client transmission Other services require muxing or inverse muxing (no transparent transmission) Support for native 40G or 100G will require ripping out OEO fabric Confidential 8 Multi-degree ROADM or OEO? Why be forced to choose? All Optical ROADM Advantages: OEO Advantages: Sub-Wavelength Switching Per wavelength Scaleable 1 2 . . . 40 Potentially Lower Terminal Costs (at full capacity) Simpler Optical Engineering Lower Power Simpler Multi-Degree Operation Fully Automated Optical Layer Low Pass-thru costs Fully Bit Rate Transparent 1G 10G 100G Multi-Degree ROADM Switch 100G 40G 10G 10G 2.5G 2.5G Per WL OEO Switch Multi-Degree OEO Switching Digital ROADM Node Confidential 9 Digital ROADM Hybrid Node Lowest Overall Cost & Flexibility All Optical ROADM Multi-Degree All Optical ROADM 100G 40G 10G 10G 2.5G 2.5G Multi-Degree Digital Switching TR Digital ROADM Node All Optical Spur Maintain manageable regions of transparency 7 Relative Cost, $ TR Per WL OEO Switch 6 5 4 3 2 1 0 All Optical Digital ROADM Hybrid All OEO Topology Agnostic Traffic Pattern Agnostic Bit Rate Agnostic Simpler Optical Engineering Simpler Multi-Degree Operation Lower overall cost solution 10 Confidential Intelligent Optical & Electrical Switching Optical Drop Wavelength WSS ROADM (Optical Switch) Electrical ADM Drop/Add 1 GbE Add 6 GbE Electrical ADM Cross-WL Optical Switch with integrated WDM Switching Options: • Pass Thru Entire Wavelength Transponder with Electrical ADM Switch ADM ADM Mux Mux • Optically Add/Drop Entire Wavelength • Optically Add/Drop Multiple Wavelengths (Multi-degree) • Electrically Add/Drop on a per Service Basis • Add/Drop Multiple Services/Wavelengths for Cross Wavelength Grooming & Multi-degree Switching 11 Confidential ROADM 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) MP-WSS WSS O P M Flexible Drops Flexible Adds 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 100G 40G 10G 10G 2.5G 2.5G 12 Confidential