Reconfigurable Optical Networks using WSS based ROADMs Steven D. Robinson VP, Product Management srobinson@meriton. com 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 3 rd Generation ROADM systems OEO vs. All Optical ROADMs
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 100 G (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 and Management Systems ROADM OPM Plane & True “Point-and-Click” Provisioning O P M ADM Mux West Confidential East Up to 16 degrees Design Networks in Minutes 1
What is a ROADM? Reconfigurable Optical Add/Drop Multiplexer (ROADM) 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 filters 2 Degree ROADM Blocker/IPLC with fixed filters OPM Fixed Port ROADM OEO Regen Per Optica Multi-port Mux/Demux (Point-to-point DWDM) l Switch OPM Multi-Degree WSS with fixed filters OPM Fixed drops Fixed Adds Per Optical Switch FOADM 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 Key Features: MP-WSS * Manages all wavelengths * 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 and End-to-End Management Rapid Automated Network Planning 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 14 15 16 17 18 19 20 21 1 -12 All Optical ROADM : 42 Transponders 12 1 1 1 1 1 21 ILA All OEO or “Digital Transport”: At least 380 Transponders 21 21 20 20 19 19 18 18 17 17 16 16 15 15 14 14 13 13 12 12 ILA § 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 Confidential
OEO or ROADM Which is the better choice? Bit Rate 40 Gb/s 10 Gb/s 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 OEO Regen Network Bandwidth Efficiency 10 x 10 G Integrated Rx OEO Regen 4 x 10 G 10 x 10 G Integrated 10 G OEO: § Optimized for 10 G client transmission § Other services require muxing or inverse muxing (no transparent transmission) § Support for native 40 G or 100 G will require ripping out OEO fabric Confidential 8
Multi-degree ROADM or OEO? Why be forced to choose? All Optical ROADM Advantages: OEO Advantages: § Fully Bit Rate Transparent 1 G 100 G § § § Per wavelength Scaleable 1 2 . . . 40 § § § Lower Power Fully Automated Optical Layer Low Pass-thru costs Sub-Wavelength Switching Potentially Lower Terminal Costs (at full capacity) Simpler Optical Engineering Simpler Multi-Degree Operation Multi-Degree ROADM Switch 100 G 40 G 10 G 2. 5 G 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 100 G 40 G 10 G 2. 5 G TR Per WL OEO Switch Multi-Degree Digital Switching TR Digital ROADM Node All Optical Spur Maintain manageable regions of transparency § § § Confidential Topology Agnostic Traffic Pattern Agnostic Bit Rate Agnostic Simpler Optical Engineering Simpler Multi-Degree Operation Lower overall cost solution 10
Intelligent Optical & Electrical Switching Optical Drop Wavelength WSS ROADM (Optical Switch) Electrical ADM Drop/Add 1 Gb. E Add 6 Gb. E Transponder with Electrical ADM Switch Electrical ADM Cross-WL Optical Switch with integrated WDM Switching Options: • Pass Thru Entire Wavelength ADM 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 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 100 G 40 G 10 G 2. 5 G 12 Confidential
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