eu-japan workshop, brussels 18-april-2013 research on next generation optical access networks

EU-Japan Workshop, Brussels 18-April-2013 1 [email protected]

EU-Japan Workshop, Brussels 18-April-2013

Research on Next Generation Optical Access Networks

Josep PratUniversitat Politècnica de Catalunya (UPC) Barcelona

http://www.upc.es/english/hp_n.htm



Optical access evolution

HFC

ADSL

FTTH-PtP

FTTH XG/G/E-PON

FTTHWDM-PON

POTs

WDM&TDM-PON

CAPACITY, cost (per user)

xDSL

TIME

ultra-dense WDM-PON E (OFDM) /

Coh

ngPON 1 WDM - PON xWDM -

COCONUTSARDANAACCORDANCE

2008

ngPON 2, 3 ..

1G

100M

10M

EUROFOS NoEALPHA IPMUSE IP OASE IP

EU projects:

2013

DISCUS IP



PON Optical spectrum

• Video: IP• EDFA• Low loss fiber• High availability of

comp.

1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610

G-PONdownstrea

m

XG

Video NG2NG2

1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360

G-PONupstream

XG-PONupstream

?

possible bands for ngPON3 (with compatibility) : 40 nm

10 10

40 nm / 6.25 G = 800 channels !!CAPACITY x 100 !!

FSAN-ITU Estandards:



E/O BW & power Efficiency

Optical Spectrum Efficiency

1%

10%

100%

1000%

0.01% 0.1% 1% 10%

Electrical Spectrum Efficiency WDM/TDM

ud-WDM

XG-PON

0.1%

RoFOFDM

100%

Bidirectional Transmission

RN1 RN2

RNj

RNN RNN-1

1:K

1:K

1:K

D m+1,…, D

2N

WDM RING

TDM TREE

D1,…, D

m

Downstream Signals

Upstream Signals

U 1,…, U

2N

U1,…, U

2N

RSOA ONU

PIN/APD

Casa

Casa

Factory

Casa

Building 2

Central Office

Edificio 1

RNi

Casa

ONU 1

ONU 2

ONU 3

CO

ONU 1

ONU 3

BS 1(ONU 2)

BS 3

Segment 4: Pure Wireless

(e.g. WiMax, LTE)

Segment 3: OFDMA/DSCA PON

Segment 2: Hybrid Optical/Wireless

Segment 5: Legacy (e.g. GPON, EPON)

and NG Optical Access ONU 2

ONU 1

ONU 3

to S

egm

ent 1

Segment 1: Copper-based Access

(DSL)

to S

egm

ent 5

to S

egm

ent 2

to S

egm

ent 3

to S

egm

ent 4

from

Seg

men

t 4

from

Seg

men

t 3

from

Seg

men

t 2

from

Seg

men

t 5

from

Seg

men

t 1

BS 2

BS 1

• Statistical WDM multiplexing

• Time-switched phase diversity&modulation

PowerComsp.:

= C Vd2 fr + Io 10Vt/S Vd

x Activity %

EF = Rb / BW

GPON



PON alternativesGPON XGPON TWDM-

PONWDM-PON SCM/OFDM-

PONcUDWDM

-PONAggregate BW 2.5/1.25 10G/2.5 40G/10G >40G

Depends on type

Good if combined with WDM

>40G

Granularity(min BW/user)

1 AWG port assigned

N subcarriers 1G-10G Good if +TDM

Complexity, cost Tunable TRX ONUs

Up-stream or tunable laser

Upstream, PAPR, optical amplif. or

coherent

Coherent RX, random/tunable

lasers ?

Energy efficiency BWuser /

10G

BWuser /

10G

If ONU only handles assign.

subc.

User rate = line rate

Optical spectrum efficiency

Good if combined with WDM or

coherent

Power budget best

Incremental scalability (n.,BW)

Limited by device, AWG,

or RBS

Compatibility AWG Sensitivity issueWireless

Splitter if coherent det.



Participant name Short name Country

1 Universitat Politecnica de Catalunya UPC Spain

2 France Telecom / Orange FT France3 Tellabs TELLABS Finland4 Intracom S.A. Telecom Solutions IntraCOM Greece5 Instituto de Telecomumicações IT Portugal6 High Institute of Communication

and Information Technology ISCOM Italy

7 Research and Education Laboratory in Information Tech. AIT Greece

SARDANA project

Scalable Advanced Ring-based passive Dense Access Network Architecture”

Activity: ICT-1-1.1 - Network of the FutureGrant agreement n.: 217122 (SARDANA) STREP: 2008-2010, 2.6 MEuro



CO

RN1 RN2

RNi

RNj

RNN RNN-1

1:K

ONU ONU

1:K

ONU ONU

ONU ONU

1:K RSOA ONU

D m+1,…, D

2N

WDM RING

TDM TREE

D1,…, D

m

Downstream Signals

Upstream Signals

U 1,…, U

2N

U1,…, U

2N

Bidirectional Transmission PIN/APD

ONU ONU

ONU ONU

ONU ONU

SARDANA architecture def.

SARDANA PON

• Resilient trunk

• Fully passive

• Hybrid: •WDM Metro ring•TDM Access trees

• Cascadable remote nodes

• New adoption of remotely-pumped amplification

• Colourless ONU• RSOA• Tunable laser

• 10G-2.5G (1G-100Mb /user)• 100 Km • 1000 users

• Multi-operator

• Based on xGPON, but transparent.

• IP trafic



SARDANA inter-operability & multi-operability



3 testbed demonstrations

1. Stakeholder demo in Espoo (Finland) in October 2010 (integration and tests)

2. Field trial in Lannion (France), in January over the metropolitan 12x 18 Km ring cable

3. Public demo at the Exhibit of FTTH Council Europe 2011, in Milan in February 2011.



ACCORDANCE STREP projectACCORDANCE STREP project

A Converged Copper-Optical-RaDio OFDMA-based Access Network with High Capacity and FlExibility

Definition of a novel Access Network architecture achieving convergence among heterogeneous technologies (optical, wireless, copper).

Propose low-cost, low-complexity concepts to achieve ultra high data rates in the access network (up to 100Gbps aggregate and more than 10Gbps in each segment).

Introduction of flexible bandwidth allocation concepts using dynamic FDM and OFDM sub-carrier assignment.

Provision of smooth migration from and coexistence with legacy access solutions.

Demonstration of the ACCORDANCE concepts using experimental test beds.

Objectives Consortium



OFDM-PON (ACCORDANCE STREP project)OFDM-PON (ACCORDANCE STREP project)

ONU 1

ONU 2

ONU 3

CO

ONU 1

ONU 3

BS 1(ONU 2)

BS 3

Segment 4: Pure Wireless

(e.g. WiMax, LTE)

Segment 3: OFDMA/DSCA PON

Segment 2: Hybrid Optical/Wireless

Segment 5: Legacy (e.g. GPON, EPON)

and NG Optical Access ONU 2

ONU 1

ONU 3

to S

egm

ent 1

Segment 1: Copper-based Access

(DSL)

to S

egm

ent 5

to S

egm

ent 2

to S

egm

ent 3

to S

egm

ent 4

from

Seg

men

t 4

from

Seg

men

t 3

from

Seg

men

t 2

from

Seg

men

t 5

from

Seg

men

t 1

BS 2

BS 1

Envisioned Converged Network ArchitectureEnvisioned Converged Network Architecture

IntegratedIntegratedDEMODEMO



OFDM-PON system

pol-div,90°

hybrid

DAC25 Gsps

DSP256-IFFT 6

DAC25 Gsps

oIQmodulatortwin MZMtwin driver

low-phase noise laser

source

T

pol-div,90°

hybrid

Clocks synthesis

FEC

FEC

OLT-MAC

switch

seed link

PBS

DS signal DS aux carrierlow-phase noise laser

source

R

ADC

6

6 low-phase noise laser

source

DSP256-FFT

low-phase noise laser

source

ADC

carrier offset control

3dBsplitter-stage

Seed signal combiner:

Seed

DS/US signals DS/US/Seed signals

to ONUs

T

R6

ONU MAC

opticalpre-amp

FFT

Demod

FEC

PIN TIA

linear EAM-driver

el. up-con-version

electricaltuning

section

DAC

DAC

6

6

clock synthesis

switch

ADC

6

ADC

REAM

IFFT

Mod

FEC

Rx subchannel select

tx subchannel select

G1

G2

to OLT

OLT ONU

Indicative experimental results by ACCORDANCE partners:

R. Schmogrow et al., “101.5 Gbit/s Real-Time OFDM Transmitter with 16QAM Modulated Subcarriers” , OFC’11

OFC’13: P. Schindler et al. OW1A.5



Flexible BW Allocation to deal with: the Power difference between (ONU1-ONU2)

50 40 30 20 10 0ONU2 BW occupation [%]

50 40 30 20 10ONU2 BW occupation [%]

0

ab

cd

e

f

a b c d e f

for proper detection at BER=10-3, leaving ONU1 with B(Q)PSK modulation

The high BW granularity allows OFDMA to deal with differential link loss among users.



Example of ACCORDANCE MAC Scheduling

Various options possible:• Multiple subcarriers per ONU (hybrid

OFDMA/TDMA)• Multiple ONUs per subcarrier (TDMA)

ONU 5

OFDMA Frame(duration = few ms)

sub-carrier 1

sub-carrier 2

sub-carrier N

…ONU 1

ONU 2

ONU 3

ONU 4

ONU 3

ONU 1

ONU 1

Inte

r-Fr

ame G

ap

Inte

r-Fr

ame G

ap

ONU 2

ONU 6

ONU 6

time

PHY/MAC Cross-layer optimization

• Use of Adaptive Subcarrier Modulation (ASM)• Use a different m-QAM for each ONU based on

transmission performance• MAC takes into account different bitrates for a

subcarrier each time, depending on the allocation• Lower delay for same traffic, i.e. capacity is

effectively increased



COCONUT project: Coherent UD-WDM• Can we improve the spectral efficiency in both optical&electrical domains?• and the BW? • and optical fine granularity ?• and the Power budget?

Proposal: Coherent UD-WDM with random-wavelength DFB lasers

+

I’’ Q’’t0 t0+T/2 t0+T

t

I’ Q’t0+3T/2 t0+2T

OLTSW TX

array

ONU 1

hRXarray

hr-OSA

dsus

ONU n

hRX

TX

DataDS

DataUS

ONU i

Local Laser

+

-

Phase Scrambler

DataOpticalInput I&Q

processing

CLK



COst-effective COhereNt Ultra-dense-WDM-PON for lambda-To-the-user access

10th Concertation Meeting, October 2012

• STREP 318515, ICT Objectives 1.1 a) b) • 1st-Nov + 36 months• Coordinator:

– SSupSA (Ernesto Ciaramella)– Vice-coordinator: UPC (Josep Prat)

• GOAL: efficient TTH– 1G-to-the-Home + 10G-to-the-Antenna– By: ultra-dense WDM-PON, by:

• Statistical WDM multiplexing• Simplified coherent transmission



What Ligh Source at Home for WDM ?• Requirements:

– All the same : colourless (wavelength agnostic)• for feasible provisioning and high volumes fabrication

– Broadband: > 1GBit/s

• Possible solutions: – Tuneable laser : still expensive and non-repetible– Reflective SOA, wavelength remodulation: limited perform.– Random-wavelength laser !?

• Statistical multiplexing• CO adapts to ONU• Benefit of chaos ..!



Wavelength contention statistics• Grid= 6.25GHz• Total BW = 30nm• Uniform laser statistical

distribution• Max. N. users = 600• Thermal 2nm (DFB)

(Results 1000 times aver.)

~ 1 ONU in 512 to replace

With thermal tuning

Without thermal tuning

Spectral efficiency: •Periodical allocation: 16 %•Statistical allocation: 14%



NGPON2/3 arch. features comparison

(typical-mean values) * Symmetrical PON; ** 16QAM; *** Only odd carriers used.

XG-PON TWDM WDM/TDM-PON OFDM-PON ** UD-WDM Aggregate BW 10 GBit/s 40 GBit/s 320 GBit/s 10 - 100 GBit/s x8 512 GBit/sUser data* 50-200 MBit/s 50-500 MBit/s 50M-1G Bit/s 100 MBit/s 1 GBit/sBit rate 10 GBit/s 10 GBit/s 10 GBit/s 10 - 100 GBit/s 1 GBit/s

ONU Elec. BW kHz - 10GHz kHz - 10GHz kHz - 10GHz Fi – Fi+50MHz MHz - 1 GHz

Elec.Spectrum Eff.(up) 0.5% 1% 0.5% - 10% < 200%*** < 200%

Number of users 32 128 512 128 512Wavelength Channels 1-2 4-8 32 1-8 512

Wavelength Spacing - 100 GHz 50 - 100 GHz >50 GHz 3 - 12 GHz

Optical Spectrum Eff. (up) - 10% 20-40% 1% - 20% 20 - 60%

Passive distance reach 20 km 20 Km 60 km 20 km 100 km

COST (per user, 1G, relative) 1 2 3 – 0.8 26 - 1 10 – 0.8

ENERGY C. (per user, relative) 1 1 2 – 0.8 10 – 0.7 5 - 0.4

Added features compatibility protection, metro-access converg.

wired&wireless convergence, SC-

DBA

user independencysplitter

Issues Tunable ONUColourless ONU,

Optical remote pump power

Up-stream OBI, PAPR, Sensitiv.

Wavel.tuning, polarization



Possible colaboration research topics

• Definition of requirements, test of solutions and standardization steps towards NGPON3, implementing the concept of lambda-to-the-home TTH

– from 100 Mb to 10 Gb to each home or antenna site

• Development of low cost phase-modulated lasers for elastic coherent udWDM-PON.

• Global Convergence of udWDM wired access, wireless and metro networks, in physical, MAC and control plane layers

– current collaboration between NEC and Accordance/AIT

• All optical processing with OCDMA multiplexing, transmission and GMPLS routing

– topic in joint research by NICT, RomaTre, Aveiro Univ.

• Extension of the concepts and techniques to smaller ranges: – CORE -> ACCESS -> LOCAL WIRED AND WIRELESS



THANKS!

Acknowledgements:

European 7th Framework Programme project SARDANA (www.ict-sardana.eu)European 7th Framework Programme project ACCORDANCE (www.ict-accordance.eu)European 7th Framework Programme Network of Excellence EUROFOS (www.euro-fos.eu)European 7th Framework Programme project COCONUT (www.ict-coconut.eu)


eu-japan workshop, brussels 18-april-2013 research on next generation optical access networks

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