eu-japan workshop, brussels 18-april-2013 research on next generation optical access networks
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EU-Japan Workshop, Brussels 18-April-2013 1 jprat@tsc.upc.edu
EU-Japan Workshop, Brussels 18-April-2013
Research on Next Generation Optical Access Networks
Josep PratUniversitat Politècnica de Catalunya (UPC) Barcelona
EU-Japan Workshop, Brussels 18-April-2013 2 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 3 jprat@tsc.upc.edu
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:
EU-Japan Workshop, Brussels 18-April-2013 4 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 5 jprat@tsc.upc.edu
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.
EU-Japan Workshop, Brussels 18-April-2013 6 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 7 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 8 jprat@tsc.upc.edu
SARDANA inter-operability & multi-operability
EU-Japan Workshop, Brussels 18-April-2013 9 jprat@tsc.upc.edu
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.
EU-Japan Workshop, Brussels 18-April-2013 10 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 11 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 12 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 13 jprat@tsc.upc.edu
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.
EU-Japan Workshop, Brussels 18-April-2013 14 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 15 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 16 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 17 jprat@tsc.upc.edu
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 ..!
EU-Japan Workshop, Brussels 18-April-2013 18 jprat@tsc.upc.edu
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%
EU-Japan Workshop, Brussels 18-April-2013 19 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 20 jprat@tsc.upc.edu
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
EU-Japan Workshop, Brussels 18-April-2013 21 jprat@tsc.upc.edu
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)
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