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Scalable Advanced Ring Dense Access Network Architecture

Scalable Advanced Ring Dense Access Network Architecture

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Scalable Advanced Ring Dense Access Network Architecture

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  1. Scalable Advanced Ring Dense Access Network Architecture Prof. António Teixeira Instituto de Telecomunicações Aveiro, Portugal

  2. Presentation Overview Motivation: FTTH research,… towards NG-PON SARDANA Architecture Fundamental goals of SARDANA Approach, subsystems and enabling technologies Conclusions, challenges and further research Final outcomes Project organization

  3. Bit rates Interface number FTTH research: motivation • Investment and risk deferring • unpredicted growth after G/E-PONs • unpredicted take rates, geographically & temporally • Evolution after G/E-PON ? • Towards Access-Metro convergence • Assure the future full usability of infrastructure • Dark fibre available,… in limited number • Fibre exhaust urban areas • Smooth migration

  4. Impact on infrastructure Current solutions Fully passive ngPON - Congestion in urban areas - Complex environmental conditions for Street Cabinets + Reduced impact + Simpler

  5. SARDANA Architecture • SCALABLE & CASCADABLE -> Smooth migration & flexible growth • High user-density (>1000 users/2 fibers) • 100Mbit/s (min granted), 10Gbit/s (max)… per User. • Long reach (100km) with Protection & Traffic Balancing by central ring • Single-fiber colourless access • Fully PASSIVE fiber plant

  6. Fundamental goals Maximize: N. served users (>1000 per fibre ring) Served area (100Km) Served capacity (10Gbit/s x 32) Minimize: Infrastructure COST N. Fibres / cables N. Cabinets N. Active areas Civil work investments Musts: Passive external plant Single fibre access Scalability and upgradeability Compatibility with g/e-PON MAC Robustness: Protection Monitoring and electronic compensation • UNLIMITED PON

  7. SARDANA targets SARDANA project targets the extension of the limits of PONs, Scalability is reached by means of the new adoption of remotely-pumped amplification, a WDM/TDM overlay and cascadable remote nodes in a new hybrid architecture; it allows smoother growth and migration while keeping the passiveness of the PON and reducing civil work investments. The resulting network is able to serve more than 1000 and 4000 users with symmetric several hundred Mbit/s per user, spread along distances up to 100 km, up to 10Gbit/s. Robustness is achieved by means of passive central-ring protection and new monitoring and electronic compensation strategies over the PON, intelligently supervising and controlling the impairments that are present or can be present in a 10Gbit/s extended PON.

  8. SARDANA equipment general scheme Separate: standard GPON (MAC) + SARDANA Integrated functionality: adapted GPON + SARDANA

  9. Approach and basic modules • Passive Remote Nodes (RN): • Cascadable Add&Drop • 2-to-1 fibre interface • Remotely pumped (from CO) optical amplification by EDFs • Athermal splitters and fixed filters • WDM ring: Resilience • (up to 1.2Tbit/s) • TDM trees • Simple colourless ONU: • In line with techno-economical guidelines • CO (OLT): • Centralizes the light generation and control • Stack of lasers serving TDM trees • Standard G/E-PON equipment adapted to SARDANA

  10. CO RNn RN1 2km 2km 1km m 1km rEDFs Add/Drop X/Y X/Y 50 / 50 How does SARDANA work? Let’s follow the blue signal for RN i • The CO sends WDM signals to the Remote Nodes (RN) • Each RN drops all channels • Signals pass a 50/50 splitter for resilience (signal can be dropped form each direction, and upstream signal is transmitted in both directions) • 50/50 provides signals to 2 TDM trees at 2 different channels • Assigned channels are selected by filters • Signals are amplified by EDFs (the Remote Node receives the Pumping Power for the EDFs remotely, from the WDM ring) • The amplified signals are transmitted to the ONUs WDM WDM λUi2, λDi2 λUi1, λDi1 Pump Pump 1:16 1:16 50/50 50/50 RNi

  11. Remote Node design v1.5 Cost effective Remote Node Transparent WDM Ring Add/Drop X/Y: 90% Pass/10% Drop • 50/50 splitter for: • Resilience • Traffic Balancing • Double Ring to avoid RB in Bidirectional Single-Wavelength Single-Fiber Transmission

  12. Remote Node design… evolution • Passive Remote Nodes (RN): Cascable, Remotely pumped (from CO),… v1): Tunable lasers at ONU • Single fiber Ring • Add&Drop by splitters X/Y: 90% Pass/10% Drop (10dB drop loss) v1.5): Colorless ONU (MZM & RSOA) • Double fiber Ring to avoid Rayleigh at ring and EDFs • More EDFs… more pump power required MZM - ECOC 2006, We3P169 RSOA - OFC 2007, OTuG2 OFC 2006, JThB78

  13. Remote Node design… evolution • Remotely pumped (from CO) optical amplification by EDFs • Athermal splitters and fixed filters • 50/50 splitter for: resilience and Traffic Balancing • Passive Remote Nodes (RN): • Cascadable Add&Drop • 2-to-1 fibre interface v2): Add&Drop by filters, transparent for other wavelengths. • Scalability maintained • Drop IL reduce from 10.2dB to 0.7dB • Thermal Drift <1.2pm/ºC • 10dB power budget gained ECOC 2007, We6.4.3

  14. Set-Up description… & update • CO: Laser, MZM, Pump Laser • ONU: Reflective SOA + Detector

  15. Colorless ONUs Colorless ONU for Low-cost access network ONU represents about 80% of network cost* (excluding P2P) Colorless ONU for decreasing: Costs of operation, administration, maintenance functions Price by mass production of just one ONU specification Reflective for operating in a single-fiber to the user Technologies: Reflective SOA,... Potentially low cost Tunable Lasers,… *: R.I. Martinez et al, “A Low Cost Migration Path Towards Next Generation Fiber-To-The-Home Networks”, ONDM 2007, LNCS 4534, pp 86-95 (2007)

  16. Conclusions & Further research • Basic feasibility shown by transmission measurements: • Highly Flexible and Scalable Network Architecture • High user-density (>1000) & Long reach (100 km) in worse case, checking resilience capability at 1G by 10dB power budget improvement • Single-fiber access & Fully PASSIVE fiber plant • Using RSOA-ONU as a cost-effective implementation • High Bandwidth per user by means of 10Gbps/2.5Gbps half-duplex system • A lot to do… • Gain stabilization of remote EDFs, pump power reduction… • Increase robustness by electronic compensation strategies and intelligent monitoring and controlling of impairments • Full demonstrator building, MAC implementation & Field trial • … to be done in the next step…

  17. Final Outcomes • SARDANA project targets the ultimate extension of the limits of FTTH Passive Optival Networks, as a practical transparent approach to access&metro convergence. • Sardana Test-bed Demonstration in Espoo-Finland, with extended scalable reach, number of homes, bandwidth, passively scalable external plant and resiliency. • Sardana Field-Trial in 2010 in Lannion-France, with new broadband services. • Network/system/subsystem/component design guidelines. • Contribution to Regulatory Bodies on Broadband Access to citizens (multi-operator infrastructure sharing strategy). • Contribution to international Standards on next-generation FTTH.

  18. From Jan 2008: FP7 SARDANA STREP project Grant agreement no.: 217122(STREP), Call: FP7-ICT-2007-1 , Activity: ICT-1-1.1 - Network of the Future Josep Prat (project manager), Scalable Advanced Ring-based passive Dense Access Network Architecture

  19. SARDANAproject organization The Work-Plan of SARDANA is organized in several Work-Packages (WP) with definite interrelationships. 1. WP-Mg: Project Management and Outcomes. 2. WP-Ar: Network Architecture 3. WP-Mc: MAC and Higher Layers 4. WP-Tr: Transmission and modulation formats 5. WP-Sy: Network Subsystems 6. WP-Im: Monitoring and adaptive compensation of PON Impairments 7. WP-Dm: Demonstrator and Field-trial

  20. Thank you! Josep Prat1, Jose A. Lázaro1, Philipe Chanclou2, Giorgio M. Tosi Beleffi3, Antonio Teixeira4, Ioannis Tomkos5, Risto Soila6, Vassilis Koratzinos7 1: Universitat Politècnica de Catalunya (UPC), Barcelona, (Spain) 2: France Telecom R&D Réseaux d'Accès (RESA), France 3: ISCOM, Italian Communication Ministry, Optical Comm. & Devices, Rome (Italy) 4: Instituto de Telecomunicações (IT), Aveiro 3810-193, (Portugal) 5: Research and Education Laboratory in Information Technologies, Athens, (Greece) 6: Tellabs Oy, Espoo, (Finland) 7: Intracom S. A Telecom Solutions, Athens (Greece)