Scalable Advanced Ring Dense Access Network Architecture

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


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


Impact on infrastructure

Current solutions Fully passive ngPON

- Congestion in urban areas

- Complex environmental

conditions for Street Cabinets

+ Reduced impact

+ Simpler


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

6 www.ict-sardana.eu [email protected]

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)


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.


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)


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


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


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


• 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


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


v1.5): Colorless ONU (MZM & RSOA)– Double fiber Ring to avoid

Rayleigh at ring and EDFs

– More EDFs… more pump power required


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


• 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


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


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)


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…


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.


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


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!

Scalable Advanced Ring Dense Access Network Architecture

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