A λ switched photonic network for the new transport backbone of Telecom Italia
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1 GRUPPO TELECOM ITALIA Photonics in Switching 2009 Tirrenia, September A λ switched photonic network for the new transport backbone of Telecom Italia Piergiorgio Pagnan, Marco Schiano Transport & OPB Engineering Transport & OPB Innovation
2 Summary Evolution drivers and requirements Network structure and dimensioning Network scalability Toward 100 G networking Future evolution and research challenges Telecom Italia Transport & OPB Innovation Marco Schiano
3 Why a new Photonic Backbone? To cope with a remarkable traffic increase from the domestic networks (especially the IP backbone) from International networks from the emerging λ wholesale market To decrease costs (both CAPEX and OPEX) To enhance reliability for critical services To reorganize the transport backbone into a single easily manageable platform, switching over multiple legacy DWDM systems Marco Schiano, Transport & OPB Innovation 3
4 The domestic client networks X TOMI 2 MI 1 SS ALPC VR VE BO A PI FI P N G P RM 2 E RM R 1 M 1 NA NA BA TA TO AL GE SV CA IP backbone architecture OPB: Optical Packet Backbone COBG BS M I MO PI FI BZ VR PD BO RI RM TS VE AN PG PE NA NL BA TA CA PA CT 2.5 Gbit/s SDH ring architecture Today used for structured VC4 services Excellent reliability (MS-SPRing) ASON meshed network SDH cross-connects and DWDM links Control Plane, centralized routing Marco Schiano, Transport & OPB Innovation 4 PA CT CZ CRS 1 Tera-routers in the core 10 Gbit/s POS interfaces for all links 40 Gbit/s POS interfaces in the core
5 Carrying international traffic through Italy Telecom Italia Sparkle Pan-European Backbone Traffic originated in far and middle east is conveyed to Sicily by submarine systems It has to be delivered to northern Italy where the Telecom Italia Sparkle Pan European Backbone PoPs are located MedNautilus Marco Schiano, Transport & OPB Innovation 5
6 Opportunities of new photonic technologies Ultra Long-Haul DWDM Multi-degree ROADM Fewer regenerators CAPEX savings End-to end provisioning Enhanced GMPLS Control Plane OCh protection and restoration OPEX savings Transparent Optical Tunnel Protected/ Restored Path Marco Schiano, Transport & OPB Innovation 6
7 The Photonic Backbone structure 500 km 1000 km Tentative scheme of the new Backbone Network diameter: km (working-protection paths) Maximum number of hops: 11 Nodal degree: 2 5 (av. 3.1) Marco Schiano, Transport & OPB Innovation 7 Technology: 40 λ switching nodes based on ROADMs 60 ULH DWDM systems with 80 lambdas G.655 and G.652 fibers 10 and 40 Gbit/s optical channels (OCh) Ready for 100 G transmission
8 Preliminary network dimensioning Traffic load rough forecast in 2011: 542 OCh (mixed 10 and 40 Gbit/s) 100 OCh are used for traffic protection Maximum number of hops: 9 Maximum OCh length: 1600 km 6 Tbit/s total capacity No serious issues of lambda congestion at least with 2011 traffic estimates A double fully disjoint protection path is not available for all OCh due to cable topology limitations Marco Schiano, Transport & OPB Innovation 8
9 Network scalability raw estimation Total network capacity: 1300 OCh OCh network capacity: 1300 OCh (estimation based on present traffic pattern) Bandwidth capacity ranges from 13 to 130 Tbit/s depending on OCh bit rates 130 Tbit/s G 40 G 100 G 2011 network utilization (542 OCh, 6 Tbit/s): 30% OCh exploitation 11% bandwidth exploitation (referred to fully 40G network) Marco Schiano, Transport & OPB Innovation 9
10 Network scalability analysis Increasing OCh number may be limited by fully loaded DWDM links Adding new DWDM systems in parallel is the easiest way to upgrade the network, provided that new ROADM line ports and new fibers are available New DWDM system New line port on ROADMs Unique cable Congested Path Marco Schiano, Transport & OPB Innovation 10
11 DWDM systems as a function of increasing OCh 90 Number of Systems ( 80 40G) Nominal Demand (542 λ) +20 % (651 λ) +50 % (813 λ) +100 % (1084 λ) +200 % (1626 λ) Marco Schiano, Transport & OPB Innovation 11
12 Photonics in Switching 2009 Nodal degree as a function of increasing OCh Nom +20 % +50 % +100 % +200 % BAR CAT CTZ LAM MAZ NAP NOL PAR PES RMI RMS TAR ALE ANC BOP BLZ FIR GEN MIB MIM MOD PDS PRM PGA PES PCA PIS RIM RMI RMS VRS SAV TOR TRT TRE TRI UDI VEN Marco Schiano, Transport & OPB Innovation 12
13 CAPEX evaluation for OCh increasing: common parts Icremental cost for common parts (ROADM and OLA) 40% 35% 30% 25% 20% 15% 10% 5% 0% Nominal Demand (542 λ) +20 % (651 λ) +50 % (813 λ) +100 % (1084 λ) +200 % (1626 λ) Marco Schiano, Transport & OPB Innovation 13
14 CAPEX evaluation for OCh increasing: whole network Incremental CapEx for the whole network 180% 160% 140% REGENERATOR TRANSPONDER OLA ROADM 120% 100% 80% 60% 40% 20% 0% Nominal Demand (542 λ) +20 % (651 λ) +50 % (813 λ) +100 % (1084 λ) +200 % (1626 λ) Marco Schiano, Transport & OPB Innovation 14
15 Network lifetime expectation Initial network deployment foreseen in 1Q 2010 Long term traffic estimates are unreliable, however: If the annual traffic growth rate is 25%, the total network load will be around 55 Tbit/s in 2020 Even higher traffic growth rate, up to 40% per year, can be sustained by the new photonic backbone in the next decade Marco Schiano, Transport & OPB Innovation 15
16 When 100 G will become economically viable? Relative Network Cost (reference: traffic of 6 Tbit/s and 10 Gbit/s) Gbit/s 40 Gbit/s 100 Gbit/s 60 Tbit/s 30 Tbit/s 18 Tbit/s 12 Tbit/s 6 Tbit/s Assumptions on transponders cost ratio: 40G/10G=2.5, 100G/40G=2 Marco Schiano, Transport & OPB Innovation 16
17 When 100 G will become mandatory? 35 Maximum nodal degree required Gbit/s Gbit/s Gbit/s 0 6 Tbit/s 12 Tbit/s 18 Tbit/s 30 Tbit/s 60 Tbit/s Marco Schiano, Transport & OPB Innovation 17
18 Energy savings and other operational benefits Compared to transport on point-to-point DWDM systems, energy savings range between 20 and 30% Energy saving is mainly due to the regenerator number reduction, while ROADMs power consumption is very low Other important benefits are: Remarkable spare parts reduction (due to fewer regenerators); ~40% circuit creation cost reduction; Opportunity of relocating the circuits of legacy networks on the new backbone simplifying the transport in the backbone Marco Schiano, Transport & OPB Innovation 18
19 Expected improvements and research open issues Node architecture for scalable colorless-directionless add/drop Coexistence of 10 G intensity-modulated and 40 G phasemodulated OCh 100 G transmission reach Control Plane Restoration speed. Marco Schiano, Transport & OPB Innovation 19
20 Node architecture Complexity of Colorless Directionless node architectures P. Roorda, B. Collings Evolution to Colorless and Directionless ROADM Architectures, Paper NWE2, OFC 2008 Scalable node architectures for traffic add-drop have already been proposed New optical components are required Marco Schiano, Transport & OPB Innovation 20
21 10 G and 40 G OCh coexistence In a first deployment stage intensity modulated 10 G and phase modulated 40 G OCh will coexist in the network Appropriate launch power limitation must be set for 10 G OCh in order to avoid serious impairments on 40 G OCh This may limit seriously the 10 G reach Smart solutions such as 10 G and 40 G allocation in separate bands may be studied Marco Schiano, Transport & OPB Innovation 21
22 100 G transmission reach Basic requirement for 100 G system: at least 1000 km reach, hopefully 1500 Alfiad, M.S. et al., 111-Gb/s Transmission Over 1040-km Field-Deployed Fiber With 10G/40G Neighbors, Photonics Technology Letters, IEEE, Volume 21, Issue 10, May 15, 2009, Pages: Marco Schiano, Transport & OPB Innovation 22
23 Control Plane and restoration speed Control Plane of Transparent Photonic Networks are designed as evolution of the of opaque networks s (especially SDH) adding RWA functions The maturity of this technology has not been proven in the field yet Restoration time is still seriously limited by: Amplifier power and gain adjustment mechanisms; OCh power equalization; Optical or electrical dispersion compensation devices Marco Schiano, Transport & OPB Innovation 23
24 Conclusions The new photonic backbone provides flexibility and bandwidth that seem sufficient at least for the next 10 years It will represent the fundamental optical transport layer supporting all legacy and possibly new client networks Future network enhancements will impact on the colorlessdirectionless node architecture, on the OCh bit rate and on the restoration speed Marco Schiano, Transport & OPB Innovation 24
25 Acknowledgments We gratefully acknowledge the fundamental contribution of several colleagues: Sergio Augusto Maurizio Bartoli Valentina Brizi Carlo Cavazzoni Andrea Di Giglio Giuseppe Ferraris Marco Quagliotti Alberto Rossaro Marco Schiano, Transport & OPB Innovation 25
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