Scalable Advanced Ring
Dense Access Network
Architecture
Prof. António Teixeira
Instituto de Telecomunicações
Aveiro, Portugal
Presentation Overview
• Motivation: FTTH research,… towards NG-PON
• SARDANA Architecture
• Fundamental goals of SARDANA
• Approach, subsystems and enabling technologies
• Conclusions, challenges and further research
• Final outcomes
• Project organization
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FTTH research: motivation
•
Evolution after G/E-PON ?
•
Towards Access-Metro convergence
100 Gb
Bit rates
10 Gb
1 Gb
100 Mb
OTN
METRO
VSR
LAN OPTICAL
ACCESS
10 Mb
1 Mb
Interface number
10,000
1,000
100
10
1
3
Assure the future full usability of
infrastructure
–
Dark fibre available,… in limited
number
–
Fibre exhaust urban areas
–
Smooth migration
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LAN
VSR
METRO OTN
1m 10m 100m 1Km 10Km 100Km 1000Km
1m 10m 100m 1Km 10Km 100Km 1000Km
•
OPTICAL
ACCESS
•
Investment and risk deferring
–
unpredicted growth after G/E-PONs
–
unpredicted take rates, geographically &
temporally
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Impact on infrastructure
Current solutions
Fully passive ngPON
Central
Office
Central
Office
Power
Supply
Street
Cabinet
User
User
Buried Remote Node
Remoto enterrado
Tree
Tree
Tree
Edificio 1
Casa
Tree
Edificio 1
Tree
Tree
Casa
Underground Optical Fiber
Underground Optical Fiber
- Congestion in urban areas
+ Reduced impact
- Complex environmental
+ Simpler
Erbium Doped Fiber
enterrado
conditions for Street Cabinets
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SARDANA Architecture
• SCALABLE & CASCADABLE -> Smooth migration & flexible growth
• High user-density (>1000 users/2 fibers)
• 100Mbit/s (min granted), 10Gbit/s (max)… per User.
• Long reach
(100km) with
Protection &
Traffic
Balancing by
central ring
• Single-fiber
colourless access
• Fully PASSIVE
fiber plant
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Fundamental goals
• Maximize:
– N. served users (>1000 per fibre ring)
– Served area (100Km)
– Served capacity (10Gbit/s x 32)
• Minimize:
UNLIMITED PON
– Infrastructure COST
•
•
•
•
N. Fibres / cables
N. Cabinets
N. Active areas
Civil work investments
• Musts:
–
–
–
–
–
Passive external plant
Single fibre access
Scalability and upgradeability
Compatibility with g/e-PON MAC
Robustness:
• Protection
• Monitoring and electronic compensation
SARDANA CO
Standard
10G-GPON
OLT
Optical
Interface
SARDANA ONT
MUX
&
SERVICE
PLATFORM
Standard
10G-GPON
OLT
Optical
Interface
PUMP
SARDANA
&
PON
refl.optical
Interface
Standard
10G-PON
ONT
ROUT.
&
Standard
xPON
OLT
Optical
MONIT.
Interface
CONTROL
(control&management, monitoring, compensation)
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SARDANA targets
• SARDANA project targets the extension of the limits of PONs,
– Scalability is reached by means of the new adoption of remotelypumped amplification, a WDM/TDM overlay and cascadable remote
nodes in a new hybrid architecture; it allows smoother growth and
migration while keeping the passiveness of the PON and reducing
civil work investments.
– The resulting network is able to serve more than 1000 and 4000
users with symmetric several hundred Mbit/s per user, spread along
distances up to 100 km, up to 10Gbit/s.
– Robustness is achieved by means of passive central-ring
protection and new monitoring and electronic compensation
strategies over the PON, intelligently supervising and controlling
the impairments that are present or can be present in a 10Gbit/s
extended PON.
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SARDANA equipment general
scheme
SARDANA CO
Standard
10G-GPON
OLT
Optical
Interface
SARDANA ONT
MUX
&
Standard
SERVICE
PLATFORM
10G-GPON
OLT
Optical
Interface
PUMP
SARDANA
&
PON
refl.optical
Interface
Standard
10G-PON
ONT
ROUT.
&
Standard
xPON
OLT
Optical
MONIT.
Interface
CONTROL
(control&management, monitoring, compensation)
1.
2.
8
Separate: standard GPON (MAC) + SARDANA
Integrated functionality: adapted GPON + SARDANA
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Approach and basic modules
•
• WDM ring: Resilience
• (up to 1.2Tbit/s)
• TDM trees
–
–
–
1:K
D1,…,
Dm
RN1
CO
RN2
RNi
1:K

RNN
m+1,…,
ONU
ON
U
ONU
ONU
ON
U
RSOA
RNN-1
Bidirectional Transmission
ONU
ON
U
CO (OLT):
–
–
–
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ONU
ON
U
Centralizes the light generation and control
Stack of lasers serving TDM trees
Standard G/E-PON equipment adapted to SARDANA
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Cascadable Add&Drop
2-to-1 fibre interface
Remotely pumped (from CO)
optical amplification by EDFs
Athermal splitters and fixed
filters
1:K
D m+1,…, D2N Downstream Signals
•
1:K
ONU
ON
U
RNj
U2N
–
TDM TREE
WDM RING
U
ONU
ON
U
ONU
ON
U
U 1,…, Um
Upstream Signals
Passive Remote Nodes (RN):
•
Simple colourless ONU:
–
In line with technoeconomical guidelines
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How does SARDANA work?
Let’s follow the blue signal for RN i
• The CO sends WDM signals to
the Remote Nodes (RN)
• Each RN drops all channels
CO
RNn
X/Y
Add/Drop
WDM
λUi2, λDi2
1km
10
X/Y
WDM
50/50
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λUi1, λDi1
Pump
rEDFs
1:16
2km
RN1
50 /50
Pump
RNi
• Signals pass a 50/50 splitter for
resilience (signal can be
dropped form each direction,
and
upstream
signal
is
transmitted in both directions)
2km
50/50
1:16
1km
m
• 50/50 provides signals to 2
TDM trees at 2 different
channels
• Assigned channels are selected
by filters
• Signals are amplified by EDFs
(the Remote Node receives the
Pumping Power for the EDFs
remotely, from the WDM ring)
• The amplified signals
transmitted to the ONUs
are
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Remote Node design v1.5
• Cost effective Remote Node
1:K
D1,…, Dm
RN1
– Transparent WDM Ring
Link losses (dB)
1:K
RNN
45
ONU
ON
U
pass th 0.95
pass th 0.9
pass th 0.8
35
30
0
2
4
6
8
ONU
RSOA
Bidirectional Transmission
ONU
ON
U
Downstream Signals
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CO
RNN
Number of Remote Nodes
• 50/50 splitter for:
Pump
• Double Ring to avoid RB in
Bidirectional Single-Wavelength
Single-Fiber Transmission
ONU
ON
U
WDM
Pump
ONU
ON
U
1:32
RN1
Add/Drop
X/Y
– Resilience
– Traffic Balancing
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ONU
ON
U
1:K
RNN-1
D m+1,…, D2N Downstream Signals
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ONU
ON
U
ONU
ON
U
RNj
U m+1,…, U2N
1:K
TDM TREE
RNi
WDM RING
50
11
ONU
ON
U
U 1,…, Um
Upstream Signals
CO
– Add/Drop X/Y: 90% Pass/10% Drop
RN2
ONU
ON
U
X/Y
50/50
WDM
Pump
rEDFs rEDFs
U i2, Di2
RN i
U i1, Di1
1:32
ONU
ON
U
ONU
ON
U
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Remote Node design… evolution
•
v1): Tunable lasers at ONU
v1.5): Colorless ONU (MZM & RSOA)
– Single fiber Ring
– Add&Drop by splitters
– Double fiber Ring to avoid
Rayleigh at ring and EDFs
X/Y: 90% Pass/10% Drop (10dB
drop loss)
– More EDFs… more pump power
required
90/10
RN i
i1 i1
i2
EDFs
1:K
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RN1
1:K/2
RN2
1:K
ONU
ON
U
ONU
ON
U
ONU
ONU
ON
U
RNj
ONU
ON
U
RSOA
1:K
Bidirectional Transmission
RNN-1
D m+1,…, D2N Downstream Signals
90/10
90/10
Pass band
50/50
filter
i2
1:K
TDM TREE
RNi
WDM RING
RNN
ONU
ON
U
ONU
ON
U
U 1,…, Um
Upstream Signals
CO
ONU
ON
U
WDM
EDFs
i2
1:K
1:K/2
1:K
OFC 2006, JThB78
D1,…, Dm
U m+1,…, U2N
EDFs
i1
90/10
90/10
WDM
90/10
50/50
Pass band
filters
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1:K
Passive Remote Nodes (RN): Cascable, Remotely pumped (from CO),…
50/50
RN i
MZM - ECOC 2006, We3P169
RSOA - OFC 2007, OTuG2
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Remote Node design…
evolution
•
Passive Remote Nodes
(RN):
– Athermal splitters and fixed
filters
– Cascadable Add&Drop
– 2-to-1 fibre interface
– 50/50 splitter for: resilience
and Traffic Balancing
ONU
ON
U
1:K
– Remotely pumped (from CO)
optical amplification by EDFs
D1,…, Dm
RN1
CO
RN2
ONU
ON
U
U 1,…, Um
Upstream Signals
1:K
WDM RING
ONU
ON
U
ONU
ONU
ON
U
RNj
RNN
ONU
ON
U
TDM TREE
RNi
U m+1,…, U2N
1:K
ONU
ON
U
RSOA
1:K
Bidirectional Transmission
RNN-1
D m+1,…, D2N Downstream Signals
ONU
ON
U
i1&2
50/50
v2): Add&Drop by filters, transparent
for other wavelengths.
Signals
– Scalability maintained
– Drop IL reduce from 10.2dB to
0.7dB
– Thermal Drift <1.2pm/ºC
1:K/2
1:K/2
i2
50/50
i1
RN i
– 10dB power budget gained
1:K
ECOC 2007, We6.4.3
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Set-Up description… & update
MZM
CO
25km
25km
Optical
Switch
Tunable Laser
Pump Lasers
RN16
i1&2
25km
RN1
Optical
Switch
Upstream Fibre
25km
Downstream Fibre
Pump
WDMs
100GHz
Pump
WDMs
Pump
25km
50/50
50/50
1:16
EDFs
EDFs
Pump
Pump
2:2
50GHz
RN i
RSOA
90/10
ONU
i2
25km
Signals
X / 100-X
1:16
25km
Att
50/50
50/50
25km
i1
2km
2:2
1:16
1km
1:16
• CO: Laser, MZM, Pump Laser
• ONU: Reflective SOA + Detector
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Colorless ONUs
• Colorless ONU for Low-cost access network
– ONU represents about 80% of network cost*
(excluding P2P)
– Colorless ONU for decreasing:
• Costs of operation, administration, maintenance functions
• Price by mass production of just one ONU specification
• Reflective for operating in a single-fiber to the
user
• Technologies:
– Reflective SOA,...
– Potentially low cost Tunable Lasers,…
*: R.I. Martinez et al, “A Low Cost Migration Path Towards Next Generation Fiber-To-The-Home
Networks”, ONDM 2007, LNCS 4534, pp 86-95 (2007)
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Conclusions & Further research
• Basic feasibility shown by transmission measurements:
– Highly Flexible and Scalable Network Architecture
– High user-density (>1000) & Long reach (100 km) in worse case,
checking resilience capability at 1G by 10dB power budget
improvement
– Single-fiber access & Fully PASSIVE fiber plant
– Using RSOA-ONU as a cost-effective implementation
– High Bandwidth per user by means of 10Gbps/2.5Gbps half-duplex
system
• A lot to do…
– Gain stabilization of remote EDFs, pump power reduction…
– Increase robustness by electronic compensation strategies and
intelligent monitoring and controlling of impairments
– Full demonstrator building, MAC implementation & Field trial
– … to be done in the next step…
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Final Outcomes
• SARDANA project targets the ultimate extension of the limits
of FTTH Passive Optival Networks, as a practical transparent
approach to access&metro convergence.
– Sardana Test-bed Demonstration in Espoo-Finland, with extended
scalable reach, number of homes, bandwidth, passively scalable
external plant and resiliency.
– Sardana Field-Trial in 2010 in Lannion-France, with new broadband
services.
– Network/system/subsystem/component design guidelines.
• Contribution to Regulatory Bodies on Broadband Access to
citizens (multi-operator infrastructure sharing strategy).
• Contribution to international Standards on next-generation
FTTH.
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From Jan 2008: FP7 SARDANA STREP
project
Grant agreement no.: 217122 (STREP),
Call: FP7-ICT-2007-1 , Activity: ICT-1-1.1 - Network of the Future
Josep Prat (project manager),
jprat@tsc.upc.edu
Scalable
Advanced
Ring-based passive
Dense
Access
Network
Architecture
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Part.
Participant name
1
Universitat Politecnica de Catalunya
2
France Telecom / Orange
3
Tellabs
4
Intracom S.A. Telecom Solutions
5
Instituto de Telecomumicações
6
High Institute of Communication and Information Technology
7
Research and Education Laboratory in Information Tech.
Short name
Country
UPC
Spain
FT
France
TLB
Finland
IntraCOM
Greece
IT
Portugal
ISCOM
Italy
AIT
Greece
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SARDANA project organization
The Work-Plan of SARDANA is organized in several Work-Packages (WP) with
definite interrelationships.
1. WP-Mg: Project Management and Outcomes.
2. WP-Ar: Network Architecture
3. WP-Mc: MAC and Higher Layers
4. WP-Tr: Transmission and modulation formats
5. WP-Sy: Network Subsystems
6. WP-Im: Monitoring and adaptive compensation of PON Impairments
7. WP-Dm: Demonstrator and Field-trial
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Thank you!
Josep Prat1, Jose A. Lázaro1, Philipe Chanclou2, Giorgio M. Tosi Beleffi3,
Antonio Teixeira4, Ioannis Tomkos5, Risto Soila6, Vassilis Koratzinos7
1: Universitat Politècnica de Catalunya (UPC), Barcelona, (Spain)
2: France Telecom R&D Réseaux d'Accès (RESA), France
3: ISCOM, Italian Communication Ministry, Optical Comm. & Devices, Rome (Italy)
4: Instituto de Telecomunicações (IT), Aveiro 3810-193, (Portugal)
5: Research and Education Laboratory in Information Technologies, Athens, (Greece)
6: Tellabs Oy, Espoo, (Finland)
7: Intracom S. A Telecom Solutions, Athens (Greece)