Scalable Advanced Ring Dense Access Network
Architecture
Prof. António TeixeiraInstituto de Telecomunicações
Aveiro, Portugal
..2 www.ict-sardana.eu [email protected]
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
..3 www.ict-sardana.eu [email protected]
FTTH research: motivation• Evolution after G/E-PON ?
• Towards Access-Metro convergence
• Assure the future full usability of infrastructure
– Dark fibre available,… in limited number
– Fibre exhaust urban areas
– Smooth migration
Bit
rate
s
LAN
10 Mb
100 Mb
1 Gb
10 Gb
1 Mb1m 10m 100m 1Km 10Km 100Km 1000Km
VSR OPTICALACCESS
METRO
OTN
100 Gb
LAN
10 Mb
100 Mb
1 Gb
10 Gb
1 Mb1m 10m 100m 1Km 10Km 100Km 1000Km
VSR OPTICALACCESS
METRO
OTN
100 Gb
Inte
rfac
e nu
mbe
r
LAN10
100
1,000
10,000
11m 10m 100m 1Km 10Km 100Km 1000Km
VSR
OPTICALACCESS
METRO OTNLAN
10
100
1,000
10,000
11m 10m 100m 1Km 10Km 100Km 1000Km
VSR
OPTICALACCESS
METRO OTN
• Investment and risk deferring– unpredicted growth after G/E-PONs
– unpredicted take rates, geographically & temporally
..4 www.ict-sardana.eu [email protected]
Impact on infrastructure
Current solutions Fully passive ngPON
- Congestion in urban areas
- Complex environmental
conditions for Street Cabinets
+ Reduced impact
+ Simpler
..5 www.ict-sardana.eu [email protected]
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:– 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
UNLIMITED PON
SARDANA ONT
SARDANA CO
Standard
10G-GPON
OLT
Optical
Interface
SARDANA
PON
Standard
10G-PON
ONTSERVICE
PLATFORM
MUX
&
PUMP
&
ROUT.
&
MONIT.
Standard
10G-GPON
OLT
Optical
Interface
Standard
xPON
OLT
Optical
Interface
refl.optical
Interface
CONTROL (control&management, monitoring, compensation)
7 www.ict-sardana.eu [email protected]
SARDANA targets• SARDANA project targets the extension of the limits of PONs,
– Scalability is reached by means of the new adoption of remotely-pumped 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
1. Separate: standard GPON (MAC) + SARDANA
2. Integrated functionality: adapted GPON + SARDANA
SARDANA ONT
SARDANA CO
Standard
10G-GPON
OLT
Optical
Interface
SARDANA
PON
Standard
10G-PON
ONTSERVICE
PLATFORM
MUX
&
PUMP
&
ROUT.
&
MONIT.
Standard
10G-GPON
OLT
Optical
Interface
Standard
xPON
OLT
Optical
Interface
refl.optical
Interface
CONTROL (control&management, monitoring, compensation)
..9 www.ict-sardana.eu [email protected]
CO
RN1 RN2
RNi
RNj
RNN RNN-1
ONU ONU
ONU ONU
1:K
ONU ONU
ONU ONU
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
m
U m+1,…, U
2N
Bidirectional Transmission
Approach and basic modules
• WDM ring: Resilience• (up to 1.2Tbit/s)
• TDM trees
• Passive Remote Nodes (RN):
– Cascadable Add&Drop– 2-to-1 fibre interface– Remotely pumped (from
CO) optical amplification by EDFs
– Athermal splitters and fixed filters
• CO (OLT):– Centralizes the light generation and control– Stack of lasers serving TDM trees– Standard G/E-PON equipment adapted to
SARDANA
• Simple colourless ONU:
– In line with techno-economical guidelines
..10 www.ict-sardana.eu [email protected]
How does SARDANA work?• The CO sends WDM signals to
the Remote Nodes (RN)
• Each RN drops all channels
• Signals pass a 50/50 splitter for resilience (signal can be dropped form each direction, and upstream signal is transmitted in both directions)
• 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 are transmitted to the ONUs
RNi
Pump
WDM
λUi1, λD
i1λUi2, λD
i2
WDM
Pump
1:162km
1kmm1km
1:16
2km 50/5050/50
RN1CO
RNn
rEDFs
Let’s follow the blue signal for RN i
Add/Drop
X/Y X/Y
50/50
..11 www.ict-sardana.eu [email protected]
30
35
40
45
50
0 2 4 6 8 10
Number of Remote Nodes
Link
loss
es (d
B)
pass th 0.95pass th 0.9pass th 0.8
Remote Node design v1.5• Cost effective Remote Node
– Transparent WDM Ring
– Add/Drop X/Y: 90% Pass/10% Drop
CO
RN1 RN2
RNi
RNj
RNN RNN-1
ONU ONU
ONU ONU
1:K
ONU ONU
ONU ONU
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
m
U m+1,…, U
2N
Bidirectional Transmission
• 50/50 splitter for:– Resilience– Traffic Balancing
• Double Ring to avoid RB in Bidirectional Single-Wavelength Single-Fiber Transmission
CO
RNN RN1
RN i
ONU ONU
1:32
ONU ONU
Pump Pump WDM WDM
1:32
ONU ONU
ONU ONU
Add/Drop
rEDFs rEDFs
Pump
U i1, D
i1 U i2, D
i2
X/Y X/Y
50/50
Downstream Signals
..12 www.ict-sardana.eu [email protected]
Remote Node design… evolution
• Passive Remote Nodes (RN): Cascable, Remotely pumped (from CO),…
Pass band filters
90/10 90/10
RN i 50/50
i1 i2
1:K 1:K
EDFs
OFC 2006, JThB78 MZM - ECOC 2006, We3P169RSOA - OFC 2007, OTuG2
v1): Tunable lasers at ONU– Single fiber Ring
– Add&Drop by splitters
X/Y: 90% Pass/10% Drop (10dB drop loss)
WDM WDM Pass band filter
90/10
RN i
EDFs
90/10 90/10 90/10
1:K
ED
Fs
50/50
1:K/2
1:K/2
50/50
i2 i2 i1 i1
CO
RN1 RN2
RNi
RNj
RNN RNN-1
ONU ONU
ONU ONU
1:K
ONU ONU
ONU ONU
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
m
U m+1,…, U
2N
Bidirectional Transmission
v1.5): Colorless ONU (MZM & RSOA)– Double fiber Ring to avoid
Rayleigh at ring and EDFs
– More EDFs… more pump power required
..13 www.ict-sardana.eu [email protected]
Remote Node design… evolution
CO
RN1 RN2
RNi
RNj
RNN RNN-1
ONU ONU
ONU ONU
1:K
ONU ONU
ONU ONU
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
m
U m+1,…, U
2N
Bidirectional Transmission
• Passive Remote Nodes (RN):
– Cascadable Add&Drop
– 2-to-1 fibre interface
1:K RN i
Signals
i1
50/50
1:K/2
1:K/2
i2
50/50
i1&2
ECOC 2007, We6.4.3
v2): Add&Drop by filters, transparent for other wavelengths.
– Scalability maintained
– Drop IL reduce from 10.2dB to 0.7dB
– Thermal Drift <1.2pm/ºC
– 10dB power budget gained
– Remotely pumped (from CO) optical amplification by EDFs
– Athermal splitters and fixed filters
– 50/50 splitter for: resilience and Traffic Balancing
..14 www.ict-sardana.eu [email protected]
Set-Up description… & update
• CO: Laser, MZM, Pump Laser• ONU: Reflective SOA + Detector
1:16
RN i
Pump WDMs
Signals
i1&2
Pump
EDFs
2:2
50/50
X / 100-X
1:16
i1
50/50
Pump WDMs
Pump
EDFs
50/50
2:2
1:16
1:16
2km i2
100GHz
50GHz
Pump
1km
50/50
RSOA ONU
90
/10
CO Downstream Fibre
Upstream Fibre
Optical Switch
Pump Lasers
MZM
Tunable Laser
Optical Switch
RN16 RN1
25km 25km
25km 25km
Att
25km 25km 25km
25km
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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)
16 www.ict-sardana.eu [email protected]
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…
..17 www.ict-sardana.eu [email protected]
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.
..18 www.ict-sardana.eu [email protected]
Grant agreement no.: 217122 (STREP), Call: FP7-ICT-2007-1 , Activity: ICT-1-1.1 - Network of the Future
Josep Prat (project manager), [email protected]. Participant name Short name Country
1 Universitat Politecnica de Catalunya UPC Spain
2 France Telecom / Orange FT France
3 Tellabs TLB Finland
4 Intracom S.A. Telecom Solutions IntraCOM Greece
5 Instituto de Telecomumicações IT Portugal
6 High Institute of Communication and Information Technology ISCOM Italy
7 Research and Education Laboratory in Information Tech. AIT Greece
From Jan 2008: FP7 SARDANA STREP project
Scalable
Advanced
Ring-based passive
Dense
Access
Network
Architecture
..19 www.ict-sardana.eu [email protected]
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
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), France3: 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)
Thank you!Thank you!