Design and OAM&P aspects of a DWDM system...

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Design and OAM&P aspects of a DWDM system equipped with a 40Gb/s PM-QPSKalien wavelength and adjacent 10Gb/s channels

Nuijts, Roeland; Bjørn, Lars Lange; Petersen, Martin Nordal; Fagertun, Anna Manolova

Published in:Proceedings of the TERENA Networking Conference

Publication date:2011

Document VersionPublisher's PDF, also known as Version of record

Link back to DTU Orbit

Citation (APA):Nuijts, R., Bjørn, L. L., Petersen, M. N., & Manolova, A. V. (2011). Design and OAM&P aspects of a DWDMsystem equipped with a 40Gb/s PM-QPSK alien wavelength and adjacent 10Gb/s channels. In Proceedings ofthe TERENA Networking Conference

http://orbit.dtu.dk/en/publications/design-and-oamp-aspects-of-a-dwdm-system-equipped-with-a-40gbs-pmqpsk-alien-wavelength-and-adjacent-10gbs-channels(adf83fb1-1033-47d6-9fdd-30b46de40db1).html

Design and OAM&P aspects of a DWDM system equipped with a 40Gb/s PM QPSK alienequipped with a 40Gb/s PM-QPSK alien wavelength and adjacent 10Gb/s channels

Lars Lange Bjørn, NORDUnetRoeland Nuijts, SURFnetMartin Nordal Petersen DTU FotonikMartin Nordal Petersen, DTU FotonikAnna Vasileva Manolova, DTU Fotonik

Terena Networking Conference 201116 - 19 May, Prague, Czech Republic

connect • communicate • collaborate1

OutlineOutline

HistoryDesignVPI off-line simulationsExperimental resultsExperimental resultsOAM&PCosts considerationsConclusion

connect • communicate • collaborate

HistoryHistory

April 2009: SURFnet fosters the idea of deploying an alien wavelength.SURFnet purchases and install additional needed hardwareReady to go – September 2009

November 2009: Hero experiment presented at SC, Portland Oregon.Ability of both network was testedShortcomings identifiedgOperated in un-optimized conditions; BER < 3,0 10-16

June 2010: TNC 2010, Vilnius, Lithuania.Simulations in Ciena Optical ModellerOptimized condition BER < 10-17

May 2011: TNC 2011, Prague, Czech Republic.Whats new?


System configuration May 2011System configuration May 2011

10G i hb• 10G neighbours• Guardband variation

50 – 150 GHz• Full control of spectrum

in NORDUnet• Off-line VPI simulations


VPI simulationsVPI simulations

GOALS

• Verification of

CHALLENGES

• Obtaining all needed• Verification of experimental results

• Facilitate design and t l f t t

• Obtaining all needed information about componentsLi iti th VPI d l tcontrol of current setup

• Investigate option for future Multi-

• Limiting the VPI model to include the most important aspects of the

domain/vendor simulation tool

design


VPI configurationVPI configurationM

ux

Amsterdam – Hamburg –

St x

40G

Pol

M Mux EDFAAmsterdam Hamburg

Hamburg Copenhagen OSNR Filter (demux)

DSP

toring data1

G N

RZ EDFA 10G NRZ

Mux

Visualizer3

x 10

G

De-mux10G NRZ

rs

10G NRZ


VPI: AmsterdamVPI: AmsterdamM

ux


St x

40G

Pol



DSP

toring data1

G N

RZ EDFA 10G NRZ

Mux

Visualizer3

x 10

G

De-mux10G NRZ

rs

10G NRZ

• 40G PM-QPSK injection• Additional 10G’s• MUX• Pre-AMP


VPI: Amsterdam HamburgVPI: Amsterdam - HamburgM

ux


St x

40G

Pol



DSP

toring data1

G N

RZ EDFA 10G NRZ

Mux

Visualizer3

x 10

G

De-mux10G NRZ

rs

10G NRZ

• 640km TWRS• 9 amps• No CD compensation


VPI: HamburgVPI: HamburgM

ux


St x

40G

Pol



DSP

toring data1

G N

RZ EDFA 10G NRZ

Mux

Visualizer3

x 10

G

De-mux10G NRZ

rs

10G NRZ

• DE-MUX• Pre-AMP ALU• 10G injection• MUX


VPI: Hamburg CopenhagenVPI: Hamburg - CopenhagenM

ux


St x

40G

Pol



DSP

toring data1

G N

RZ EDFA 10G NRZ

Mux

Visualizer3

x 10

G

De-mux10G NRZ

rs

10G NRZ

• 416 km TWRS• 5 amps (dual w. access)• CD compensation


VPI: CopenhagenVPI: CopenhagenM

ux


St x

40G

Pol



DSP

toring data1

G N

RZ EDFA 10G NRZ

Mux

Visualizer3

x 10

G

De-mux10G NRZ

rs

10G NRZ

• OSNR adjustment and control• WSS represented by

filter/demux• PM-QPSK receiver with DSP


Q

VPI: Assumptions and MethodVPI: Assumptions and Method

Assumptions MethodAssumptions• Noise Figure (AMP) = 5• OSNR at REC = 20

/ ½

Method• Monte Carlo approach:

50.000 bits per data point S• PMD: 0.05x10-12 s/m½

• Nonlinearity index parameter (transmission

• Simulation time usage:With nonlinearities ~ 3-4 hours per data point.

fiber): 2.4x10-20 m2/W• Nonlinearity index

parameter (DCM fiber):

Without nonlinearities ~15 minutes.

p ( )3.0x10-20 m2/W


VPI Results:10G variation w constant 40G10G variation w. constant 40G

• XPM• Lack of SPM?


VPI Results:10G off / 40G high power10G off / 40G high power

• Strong SPMg


VPI results:40G variation w constant 10G40G variation w. constant 10G

• XPM• SPM


Experimental results:50GHz spacing50GHz spacing

dBm

)G

pow

er (d

10G



er (d

Bm

)10

G p

owe

1



r (dB

m)

0G p

owe

1


Experimental results:50HGz to 150GHz @ 10G = 20 7 dBm50HGz to 150GHz @ 10G = -20,7 dBm

The pre-FEC BER is below 10-3 unless spacing is above10 3 unless spacing is above 100GHz

The Alcatel-Lucent design guide specifies 10G = -17,2 g pin order to maintain guarantied performance according to traffic matrix!


OAM&P standardizationOAM&P - standardization

ITU StandardizationITU Standardization• G.698.1: Multichannel DWDM applications with single-channel optical

interfaces

• G.698.2: Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces

Scope & InfoScope & Info• To provide optical interface specifications towards the realization of

transversely compatible dense wavelength division multiplexing (DWDM) systems primarily intended for metro applications(DWDM) systems primarily intended for metro applications

• Applicable for 2,5G and 10G @ 100GHz / 50GHz spacing


OAM&P issuesOAM&P - issues

Consequence

NREN ISSUES

Consequence

NREN TARGETS• No transverse

compatibility for newer LH modulation schemes.

• Full optical transparency• Bitrate• Modulation format

• No standardization targets LH/ULH applications

• No standardization targets

• Spacing• Full optical control

• PowerNo standardization targets OTS/OMS interworking

Power• Spectrum• Admission


OAM&P setupOAM&P - setup

addOADCAMP WSS w ”OSA”D

A

add AMP

OADC 1:2

WSS w. OSA

WSS w ”OSA”AMP

OADC 2x4:1

B WSS 1:8EWSS w. OSAAMP C drop

40Gb PM QPSK Bitr Mod GHz Powr Spec Addm40Gb PM-QPSK Bitr Modu

GHz. Powr Spec Addm

A. Add to System ✔ ✔ ✔ ✗ ✗ ✗

B. Add to spectrum ✔ ✔ ✗ ✗ ✗ ✔

C. Control spectrum ✔ ✔ ✗ ✔ ✔ ✔

D Monitor spectrum ✔ ✔ ✗ ✗ ✗ ✗connect • communicate • collaborate

D. Monitor spectrum ✔ ✔ ✗ ✗ ✗ ✗

E. Drop from system ✔ ✔ ✗ ✔ ✗ ✗

OAM&P wrap upOAM&P wrap up

SPECTRUMSecurity ✔C t l ✔

MANAGEMENTElement Manager ✔

ALARMSNative system ✔Ali t ✔Control ✔ ✔

Network Manager ✗

Alien system ✔

REMAINING CHALLENGE• Communication between native and alien management/alarmCommunication between native and alien management/alarm

systems• Common optical design tool allowing joint network design between

different platforms with predictable performancedifferent platforms with predictable performance.


Cost considerations:200G Amsterdam Copenhagen200G Amsterdam - Copenhagen

• 6 min/XFP• 12 min/MUX

• Guard band neglected• AW and native signals can co-

( )• 30 min/linecard• 15 min/wave config• 20/30 hours travel AW/REG

exists (Joint design rules)• Alarm and Management

integration is possible


ConclusionConclusion

• VPI simulation platform for alien wavelength evaluation conforms qualitatively with experimental results

• 40G PM-QPSK together with 10G NRZ shows large BER variations for varying power and guard band size

• OAM&P is adequate for this mix of products, few steps are needed for “normal operation”

• Costs is for this mix of products in favour of the AW approach


AcknowledgementsAcknowledgements

We also would like to thank SURFnet and the Gigaport3 project for their support to acquire the 40Gb/s equipment and integration work from Telindus and simulation support from CIENA.

We are grateful to NORDUnet for providing us with bandwidth and additional transponders on their DWDM link for this experiment.

The research leading to these results has received part of its funding from the European Community’s Seventh Framework Programme(FP7/2007-2013) under grant agreement nº 238875 (GÉANT)2013) under grant agreement n 238875 (GÉANT).


Thank youThank you

Lars Lange Bjørn, [email protected]


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