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Progress in PON research in PIEMAN and MUSE

PIEMAN. Progress in PON research in PIEMAN and MUSE. Russell Davey russell.davey@bt.com. Overview. Drivers for long reach access Early feasibility results Long reach access in MUSE and PIEMAN Evolution to long reach access. Bandwidth. 100. 90. 80. 70. Revenues. 60. 50. 40. 30.

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Progress in PON research in PIEMAN and MUSE

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  1. PIEMAN Progress in PON research in PIEMAN and MUSE Russell Davey russell.davey@bt.com

  2. Overview • Drivers for long reach access • Early feasibility results • Long reach access in MUSE and PIEMAN • Evolution to long reach access

  3. Bandwidth 100 90 80 70 Revenues 60 50 40 30 Costs 20 10 0 Bandwidth Growth – The Margin Challenge 100 100 90 90 80 80 Bandwidth 70 70 growth growth Greater bandwidths - New services - Maintain/grow revenues 60 60 50 50 Relative Relative Relative Relative 40 40 30 30 Costs 20 20 10 10 0 0 2004 2005 2006 2007 2008 2009 2010 2000 2000 2001 2001 2002 2002 2003 2003 2004 2004 2005 2005 2006 2006 100 100 But costs rise faster 90 90 80 80 70 70 growth growth Revenues 60 60 … Margins are eroded 50 50 Relative Relative Relative Relative 40 40 30 30 20 20 10 10 Incremental Costs 0 0 2004 2005 2006 2007 2008 2009 2010 2000 2000 2001 2001 2002 2002 2003 2003 2004 2004 2005 2005 2006 2006

  4. 1000 way split ~100 Metro Nodes optical core 100 km 10 Gb/s Reducing cost of bandwidth by simplifying network Today 21C Long reach Vision

  5. 10 Gbit/s Bidirectional Transmission in 1024-way Split, 110 km Reach, PON System D. Nesset et al, ECOC 2005, Paper Tu1.3.1

  6. Enabling technologies Transceivers Electronic Dispersion Compensation FEC

  7. DWDM reach extension of GPON to 135 km Service or Metro node Local exchange or CO location total x64 split Infinera 40 l DWDM BT bespoke transponder 2.5 Gbit/s oeo FlexLight OLT Flexlight ONUs 1.2 Gbit/s 125 km 10 km • to Business (e.g. 10G SDH)) R.P. Davey et al, OFC 2005, Paper PDP35

  8. Reach of ~100 km Long reach PON with WDM backhaul Would allow integrated access & backhaul Service node Non-FTTP Customers big business customer WDM long PON FTTP Customers Cabinet Nx 2.5 or 10 Gbit/s MSAN 256x Split copper

  9. Ethernet GPON WDM SDH EU research collaborations Backhaul Greenfield access PIEMAN Research roadmap to long reach PON + scale protocol to 1024 split +colourless ONUs +tunable optics amplifiedGPON (60 km) 10 Gbit/s LR-PON (100+ km) WDM LR-PON Flexible l LR-PON +WDM in backhaul +10Gbit/s GPON Powered Cabinets Non-Greenfield access 2007 2012

  10. Step 1: Amplified GPONAdding amplifiers to GPON can be an interim solution for LR-PON 4 X 4 OLT1a Tx Rx 32-way Split = 17.5dB OLT1a Tx ONU Rx ONU ONU ONU 60km “Demonstration of Enhanced Reach and Split of a GPON System Using Semiconductor Optical Amplifiers” Derek Nesset, Dave Payne, Russell Davey and Tim Gilfedder ECOC 2006 24-28 September 2006 Paper Mo4.5.1

  11. Long reach PON research in SPE Consensus Standards contributions Exchange of info in same area MUSE organisation SP A Technical Steering and Consensus SP B MMBB SP C FMC SP D Distributed nodes SP E Node consolid. TF1 Access architecture & platforms WP B1 WP C1 WP D1 WP E1 TF2 First mile solutions WP B2 WP C2 (DSL) WP D2 WP E2 (Optical) WP A.3 Techno-Economics WP A.4 GSB Standardisation TF3 ResidentialGateways WP B3 WP C3 WP D3 WP E3 TF4 Lab trials WP B4 WP C4 WP D4 WP E4 Proto and trial of E2E deployment scenarios

  12. MUSE Sub Project E - Node Consolidation • Lower cost by bypassing conventional local exchange and centralising the functionality • Develop long reach PON • Optimal VDSL drop in long reach PON– explore opportunities for CWDM • 100 km reach • TC layer (PON MAC layer) implemented • Transponder at local exchange for upstream

  13. PIEMAN • FP6 Call 4 IST • STREP • Strategic objective “Broadband for All” • Start date: 1st January 2006 • Duration: 3 years • End date: 31st December 2009 • Total person-months: 340 • Total cost: €3.9m • EC contribution: €2.2m

  14. PIEMAN target system design • Longer term evolution of MUSE SPE • 10 Gbit/s upstream & downstream • All optical at local exchange – no transponders • Physical layer focus – no TC layer implemented

  15. PIEMAN Workpackages 91 MM 64 MM 87 MM 86 MM

  16. Evolution from installed FTTP (GPON) to long reach PONFibre lean

  17. LR-ONU LR-ONU LR-ONU to metro node Evolve from installed GPON to long reach PON At day one install WDM couplers in local exchange backhaul GPON GPON GPON GPON Local Exchange Cable chamber Fibre lean cable back towards Exchange GPON-ONU GPON-ONU • LR-PON ONUs and GPON ONUs share same fibre using WDM • GPON & LR-PON ONUs include wavelength blocking filters GPON-ONU GPON-ONU GPON-ONU

  18. LR-ONU LR-ONU LR-ONU to metro node Upgrade scenario 1C step 2 In time all users on one GPON will individually change to LR-PON Now remove GPON OLT from local exchange backhaul GPON GPON GPON GPON Until eventually there are no GPONs left Local Exchange Cable chamber Fibre lean cable back towards Exchange GPON-ONU GPON-ONU GPON-ONU LR-ONU GPON-ONU LR-ONU GPON-ONU LR-ONU

  19. ‘S’ Band 1460-1530nm ‘C’ Band 1530-1565nm ‘L’ Band 1565-1625nm ‘O’ Band 1260-1360nm ‘E’ Band 1360-1460nm 1300 1400 1500 1600 Fibre Spectrum Allocation EDFA ITU G694.1 DWDM grid: Centre - 1532.52nm 100, 50, 25, 12.5 GHz spacing ITU G694.2 CWDM grid 20±6.5nm FSAN Video Distribution 1550-1560nm FSAN FSAN Downstream 1480-1500nm FSAN Reserved 1360-1480nm FSAN Upstream 1260-1360nm FSAN Additional digital services 1539-1565nm FSAN Future L band reserved and unspecified WDM PON

  20. Wavelength plan for LR-PON And GPON to share fibres • GPON wavelengths • 1480-1500 nm downstream • 1260-1360 nm upstream • Optionally 1550-1560 nm for video overlay • This is not ideal from evolution perspective! • LR-PON likely to use erbium window • As do most candidates for next generation PON (e.g. WDM-PON) • If video overlay not used then ITU-T reserved 1535-1565 nm is an obvious choice for LR-PON • Reserve L-band for diagnostics and/or future use • If video overlay is used then L band may be best alternative (fibre performance needs to be comfirmed) • Since GPON and LR-PON may share the same fibre their signals must not interfere • Need cost-effective wavelength blocking (narrow bandpass) filters in GPON ONUs from the beginning • ITU-T recommend 1510 nm to remotely supervise optical amplifiers and this seems a a good idea in LR-PON • Or alternatively use ONT co-located with the amplifier to provide in-band management (keeps 1510 wavelength available and will be lower cost)

  21. Evolution from installed FTTCab to long reach PON

  22. copper to customers copper to customers DSL street cabinet DSL street cabinet FTTCab WDM overlay using optical taps Local exchange Service node (21C metro node) MSAN backhaul backhaul Optical taps fitted at initial FTTCAB installation Core network At day one install optical taps and wavelength blocking filter at cabinet

  23. copper to customers copper to customers DSL street cabinet DSL street cabinet FTTCab WDM overlay using optical taps fibre to some customers ONU Local exchange Service node (21C metro node) ONU big split ~256 MSAN backhaul backhaul Optical taps Core network LR-OLT • LR-PON ONT feeds cabinet DSL system • Customers upgrading to FTTP connected to LR-PON • Note original FTTCab optical Units need blocking filters

  24. copper to customers copper to customers DSL street cabinet DSL street cabinet FTTCab WDM overlay using optical taps fibre to some customers ONU Local exchange Service node (21C metro node) ONU big split ~256 probably two stages) MSAN ONU backhaul backhaul Optical taps Core network LR-OLT • LR-PON ONT feeds cabinet DSL system • Customers upgrading to FTTP connected to LR-PON

  25. copper to customers copper to customers DSL street cabinet DSL street cabinet fibre to some customers FTTCab WDM overlay using optical taps ONU Local exchange Service node (21C metro node) ONU big split ~256 ONU Optical taps Core network ONU LR-OLT When all cabinets fed with LR-PON then MSAN and old backhaul can be recovered

  26. copper to customers DSL street cabinet fibre to all customers FTTCab WDM overlay using optical taps ONU ONU ONU Local exchange Service node (21C metro node) ONU big split ~256 ONU Optical taps Core network ONU LR-OLT When all customers on cabinets fed with LR-PON, DSL cabinets can be recovered

  27. fibre to all customers ONU ONU ONU ONU ONU fibre to all customers FTTCab WDM overlay using optical taps ONU ONU ONU Local exchange Service node (21C metro node) ONU big split ~256 ONU Optical taps Core network big split ~256 LR-OLT When all customers on cabinets fed with LR-PON then DSL cabinets can be recovered

  28. ‘S’ Band 1460-1530nm ‘C’ Band 1530-1565nm ‘L’ Band 1565-1625nm ‘O’ Band 1260-1360nm ‘E’ Band 1360-1460nm 1300 1400 1500 1600 Fibre Spectrum Allocation EDFA ITU G694.1 DWDM grid: Centre - 1532.52nm 100, 50, 25, 12.5 GHz spacing ITU G694.2 CWDM grid 20±6.5nm FSAN Video Distribution 1550-1560nm FSAN FSAN Downstream 1480-1500nm FSAN Reserved 1360-1480nm FSAN Upstream 1260-1360nm FSAN Additional digital services 1539-1565nm FSAN Future L band reserved and unspecified WDM PON

  29. Proposal: Use CWDM grid in 1360-1480 nm range for FTTCab Look to be 3 useable wavelengths – 6 if “dry” fibre used. Taken from G.695 (01/2005)

  30. Conclusions • To reduce the cost of bandwidth, operators need to simplify networks • Long reach access is a way to achieve this • ~100 km • multiple wavelengths • ~512 customers per wavelength • Initial feasibility experiments have been reported • MUSE and PIEMAN are taking the concept further • Evolution is important • Amplified GPON as first step • In a fibre lean deployment, long reach PON will need to share fibres with deployed GPON and FTTCab • Can be achieved with WDM overlay • As long as you pre-plan it • For example blocking filters in GPON ONUs

  31. PIEMAN Thank yourussell.davey@bt.com

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