Progress in PON research in PIEMAN and MUSERussell Davey

russell.davey@bt.com

PIEMAN

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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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

Thank you

russell.davey@bt.com

PIEMAN