Overview
• Drivers for long reach access• Early feasibility results• Long reach access in MUSE and PIEMAN• Evolution to long reach access
Bandwidth Growth – The Margin Challenge
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Incremental Costs
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Costs
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2004 2005 2006 2007 2008 2009 2010
2004 2005 2006 2007 2008 2009 2010
Greater bandwidths- New services- Maintain/grow
revenues
But costs rise faster
… Margins are eroded
Reducing cost of bandwidth by simplifying network
BeginFibre to thePCP
~13,500Multi-ServiceAccessNodes
~100MetroNodes
~10CoreNodes
End Customer
InternetPeering
~ 5iNodes
InternationalNetworks
LogicalNodes
~80,000PCPsin the AccessNetwork
~100,000RemoteConcs,DSLAMS& Data Muxes
~1000 +Voice Switchesand Data CrossConnects
~170 CoreSwitches(DMSU / NGS)
DataCentre
LogicalNodes
Today
Aggregation Service Edge CoreFuture Intelligence
Today
21C
Long reachVision
~100 MetroNodes
optical core10 Gb/s
1000 way split
100 km
10 Gbit/s Bidirectional Transmission in 1024-way Split, 110 km Reach, PON System
TxXFP
Rxpin
Rxlin
10km SMF
ADM
EDC
Upstream 1551nm CWDMUpstream 1551nm CWDM
BERT (9.95Gbit/s)
DWDMTx
ADMDownstream 1535nm DWDMDownstream 1535nm DWDM
18nm
Super FEC (10.7Gbit/s)
BERT (9.95Gbit/s)
Atten
ONU LE CoreBackhaul (100km SMF)
TxXFP
Rxpin
Rxlin
10km SMF
ADM
EDC
Upstream 1551nm CWDMUpstream 1551nm CWDM
BERT (9.95Gbit/s)
DWDMTx
ADMDownstream 1535nm DWDMDownstream 1535nm DWDM
18nm
Super FEC (10.7Gbit/s)
BERT (9.95Gbit/s)
AttenAtten
ONU LE CoreBackhaul (100km SMF)
D. Nesset et al, ECOC 2005, Paper Tu1.3.1
Enabling technologies
C-band tunable DWDM
2000 ps/nm dispersion limit
300-pin MSA
Downstream
C-band tunable DWDM
2000 ps/nm dispersion limit
300-pin MSA
Downstream Upstream
XFP
Integrated DFB/EAM
Upstream
XFP
Integrated DFB/EAM
Transceivers Electronic Dispersion Compensation
Intel® IXF30009 Optical Transport Processor Intel® IXF30009 Optical Transport Processor
Super FEC code
7% overhead
6.8 dB NCG at 10-10 BER
FEC
DWDM reach extension of GPON to 135 km
FlexLightOLT
Infinera 40
DWDM
10 km125 km
BT bespoke transponder
Flexlight ONUs
total x64split
1.2 Gbit/s
2.5 Gbit/s
to Business
(e.g. 10G SDH))
oeo
Service or Metro node Local exchange or CO location
R.P. Davey et al, OFC 2005, Paper PDP35
Long reach PON with WDM backhaul
Cabinet
Service node
Nx 2.5 or 10 Gbit/s
WDM
long
PONFTTP
Customers
256x Split
Reach of ~100 km
MSAN
Non-FTTP
Customers
big business customer
copper
Would allowintegrated access& backhaul
2007 2012
GPON
PoweredCabinets
amplifiedGPON (60 km)
10 Gbit/s LR-PON(100+ km)
Non-Greenfield access
Backhaul
Greenfield access
Flexible LR-PON+10Gbit/s
+ scale protocol to 1024 split
+WDM in backhaul
WDMLR-PON
+colourless ONUs
+tunable optics
Eth
ern
et
GP
ON
W
DM
S
DH
Research roadmap to long reach PON
EU research collaborations
PIEMAN
Step 1: Amplified GPON
Adding amplifiers to GPON can be an interim solution for LR-PON
ONU
ONU
ONU
ONU
32-waySplit= 17.5dB
OLT1aTxRx4
X4 OLT1a
TxRx
60km
“Demonstration of Enhanced Reach and Split of a GPON System Using Semiconductor Optical Amplifiers”Derek Nesset, Dave Payne, Russell Davey and Tim GilfedderECOC 200624-28 September 2006Paper Mo4.5.1
TF4 Lab trials
TF1 Access architecture & platforms
TF3 ResidentialGateways
TF2 First mile solutions
SP BMMBB
SP CFMC
SP DDistributed
nodes
WP B1 WP C1 WP D1
WP B2WP C2(DSL)
WP D2
WP B3 WP C3 WP D3
WP B4 WP C4 WP D4WP
A.3
Tech
no-E
con
om
ics
WP
A.4
GS
B S
tan
dard
isati
on
SP A Technical Steering
and Consensus
MUSE organisation
Consensus Standards contributionsExchange of info in same area
Proto and trial of E2E deployment scenarios
SP ENode
consolid.
WP E1
WP E2(Optical)
WP E3
WP E4
Long reach PON research in SPE
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
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
PIEMAN target system design
ONU
ONU
ONU
ONU
ONU
ONU
PONOLT
32 DWDM
up to 10 km90 km
up to 512 split per
10 Gbit/s
10 Gbit/s
Service node Local exchange
2-fibre operation in metro
ONU
ONU
ONU
ONU
ONU
All ONUs“colourless”
EDFA
EDFA
EDFAEDFA
EDFAEDFA
EDFA
EDFA
EDFAEDFA
EDFAEDFA
1-fibre operation in access
•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
PIEMAN Workpackages
WP1. Architecture and overall system design
System design Technoeconomics
Target architecture & Subsystem specification
WP2. 10 Gb/s PON optoelectronics
Electronics
Optoelectronics
Uplink integration & proof-of-concept
Component development
Optical system integration
WP3. Tunable ON U
Component development
Optical system integration
WP4. Reflective ONU
WP0. Project management
WP1. Architecture and overall system design
System design Technoeconomics
Target architecture & Subsystem specification
WP1. Architecture and overall system design
System design Technoeconomics
Target architecture & Subsystem specification
WP2. 10 Gb/s PON optoelectronics
Electronics
Optoelectronics
Uplink integration & proof-of-concept
Component development
Optical system integration
WP3. Tunable ON U
Component development
Optical system integration
WP4. Reflective ONU
WP0. Project management
91 MM
87 MM 86 MM
64 MM
Evolution from installed FTTP (GPON) to long reach PON
Fibre lean
backhaul
Evolve from installed GPON to long reach PON
Fibre lean cable back towards Exchange
Local Exchange
to metro node
Cable chamber
GPON-ONU
GPON-ONU
GPON-ONU
GPON-ONU
GPON-ONU
LR-ONU
LR-ONU
At day one install WDM couplers in local exchange
•LR-PON ONUs and GPON ONUs share same fibre using WDM•GPON & LR-PON ONUs include wavelength blocking filters
GPONGPONGPON
LR-ONU
GPON
backhaul
Upgrade scenario 1C step 2
Fibre lean cable back towards Exchange
Local Exchange
to metro node
Cable chamber
GPON-ONU
GPON-ONU
GPON-ONU
GPON-ONU
GPON-ONU
LR-ONU
LR-ONU
In time all users on one GPON will individually change to LR-PON
GPONGPONGPON
LR-ONU
GPON
LR-ONU
Now remove GPON OLT from local exchange
Until eventually there are no GPONs left
LR-ONU
LR-ONU
1300 1400 1500 1600
‘O’ Band1260-1360nm
‘E’ Band1360-1460nm
‘S’ Band1460-
1530nm
‘C’ Band1530-
1565nm
‘L’ Band1565-
1625nm
ITU G694.2 CWDM grid 20±6.5nm
FSAN Upstream 1260-1360nm FSAN Reserved 1360-1480nmFSAN Downstream 1480-1500nm
FSAN Additional digital services 1539-1565nm
FSAN Video Distribution 1550-1560nm
FSAN Future L band reserved and unspecified
FSAN
ITU G694.1DWDM grid:Centre - 1532.52nm100, 50, 25, 12.5 GHz spacing
WDMPON
EDFAFibre Spectrum Allocation
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)
Evolution from installed FTTCab to long reach PON
FTTCab WDM overlay using optical taps
Local exchange
back
haul
Service node (21C metro node)
Core network
backhaulDSL street cabinet
copper to customers
DSL street cabinet
copper to customers
MS
AN
Optical taps fitted at initial FTTCAB installation
At day one install optical taps and wavelength blocking filter at cabinet
Local exchange
back
haul
Service node (21C metro node)
Core network
backhaulDSL street cabinet
copper to customers
DSL street cabinet
copper to customers
MS
AN
Optical taps
fibre to somecustomers
big split ~256
ONU
LR-OLT
ONU
• LR-PON ONT feeds cabinet DSL system• Customers upgrading to FTTP connected to LR-PON• Note original FTTCab optical Units need blocking filters
FTTCab WDM overlay using optical taps
Local exchange
back
haul
Service node (21C metro node)
Core network
backhaulDSL street cabinet
copper to customers
DSL street cabinet
copper to customers
MS
AN
Optical taps
fibre to somecustomers
big split ~256probably two stages)
ONU
ONU
LR-OLT
ONU
• LR-PON ONT feeds cabinet DSL system• Customers upgrading to FTTP connected to LR-PON
FTTCab WDM overlay using optical taps
Local exchangeService node (21C metro node)
Core network
DSL street cabinet
copper to customers
DSL street cabinet
copper to customers
Optical taps
fibre to somecustomers
big split ~256
ONU
ONU
LR-OLT
ONU
ONU
When all cabinets fed with LR-PON then MSAN and old backhaul can be recovered
FTTCab WDM overlay using optical taps
Local exchangeService node (21C metro node)
Core network
DSL street cabinet
copper to customers
Optical taps
fibre to allcustomers
big split ~256
ONU
LR-OLT
ONU
ONU
When all customers on cabinets fed with LR-PON, DSL cabinets can be recovered
ONU
ONU
ONU
FTTCab WDM overlay using optical taps
Local exchangeService node (21C metro node)
Core network
Optical taps
big split ~256
LR-OLTbig split ~256
When all customers on cabinets fed with LR-PON then DSL cabinets can be recovered
fibre to allcustomers
ONU
ONU
ONU
ONU
ONU
fibre to allcustomers
ONU
ONU
ONU
ONU
ONU
FTTCab WDM overlay using optical taps
1300 1400 1500 1600
‘O’ Band1260-1360nm
‘E’ Band1360-1460nm
‘S’ Band1460-
1530nm
‘C’ Band1530-
1565nm
‘L’ Band1565-
1625nm
ITU G694.2 CWDM grid 20±6.5nm
FSAN Upstream 1260-1360nm FSAN Reserved 1360-1480nmFSAN Downstream 1480-1500nm
FSAN Additional digital services 1539-1565nm
FSAN Video Distribution 1550-1560nm
FSAN Future L band reserved and unspecified
FSAN
ITU G694.1DWDM grid:Centre - 1532.52nm100, 50, 25, 12.5 GHz spacing
WDMPON
EDFAFibre Spectrum Allocation
Proposal: Use CWDM grid in 1360-1480 nm range for FTTCab
G.652.A&B cable G.652.C&D cable Nominal central
wavelength (nm)
Minimum attenuation coefficient (dB/km)
Maximum attenuation coefficient (dB/km)
Minimum attenuation coefficient (dB/km)
Maximum attenuation coefficient (dB/km)
1271 0.392 0.473 0.385 0.470
1291 0.370 0.447 0.365 0.441
1311 0.348 0.423 0.352 0.423
1331 0.331 0.425 0.340 0.411
1351 0.320 0.476 0.329 0.399
1371 0.316 0.386
1391 0.301 0.372
1411 0.285 0.357
1431 0.263 0.438 0.269 0.341
1451 0.250 0.368 0.254 0.326
1471 0.238 0.327 0.240 0.312
1491 0.229 0.303 0.229 0.300
1511 0.221 0.290 0.220 0.290
1531 0.215 0.283 0.213 0.283
1551 0.211 0.278 0.209 0.277
1571 0.208 0.276 0.208 0.273
1591 0.208 0.278 0.208 0.275
1611 0.208 0.289 0.212 0.283
Look to be 3 useable wavelengths – 6 if “dry” fibre used.
Taken from G.695 (01/2005)
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