40Gb/s alien- wavelength experiment over 1000km TWRS … · 40Gb/s alien- wavelength experiment...
Transcript of 40Gb/s alien- wavelength experiment over 1000km TWRS … · 40Gb/s alien- wavelength experiment...
40Gb/s alien-wavelength experiment over 1000km TWRS fiber between Amsterdam and Copenhagen
Roeland Nuijts, SURFnet, [email protected]
Lars Lange Bjørn, NORDUnet, [email protected]
Terena Networking Conference 2010, Vilnius, Lithuania
Outline
Alien wavelength concept
Alien wavelength advantages and disadvantages
Amsterdam-Hamburg-Copenhagen DWDM transmission systems
Alien wavelength channel allocation plan
Simple method to measure OSNR in presence of ROADMs
Results of alien wavelength experiments Amsterdam-Copenhagen
Conclusions & acknowledgements
Alien wavelength conceptRx
Tx
Tx
Rx
Rx
Tx
Tx
Rx
Tx
Rx
Rx
Tx
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Tx
Tx
Rx
(a) conventional closed DWDM system
(b) multi-domain DWDM systems
(c) multi-domain DWDM systems with alien wavelength
Alien wavelength advantages
• direct connection of customer equipment cost savings
• avoid OEO regeneration power savings
• faster time to service time savings
• support of different modulation formats extend network lifetime
Alien wavelength challenges
• complex end-to-end optical path engineering in terms of linear (i.e. OSNR, dispersion) and non-linear (FWM, SPM, XPM, Raman) transmission effects for different modulation formats
• complicated system integration/functional testing
• end-to-end monitoring, fault isolation and resolution
• end-to-end service activation
JOINT SURFnet/NORDUnet 40Gb/s PM-QPSK alien
wavelength DEMONSTRATION
W S S
W S S
10G40G
10G
W S S W S S10G
40G alien wave
10G
40G
416km TWRSAlcatel-Lucent
(with dispersion compensation)
640km TWRSNortel
(without dispersion compensation)
5x10Gb/s @ 50GHz
5x10Gb/s350GHz900GHz
End-to-end FoM = 1400 (a couple of dB margin over BOL OSNR limit - set against nonlinearities and
potentially adverse effect from filter concatenation [4])
Am
sterdam
Hamburg
Copenhagen
Ham
burg40G
40G
Transmission system configuration
Wavelength plan
194,00 193,95 193,90 193,85 193,80 193,75 193,70 193,65 193,60 193,55 193,50 193,45 193,40 193,35 193,30 193,25 193,20 193,15 193,10 193,05 193,00 192,95 192,90 192,85 192,80 192,75 192,70 192,65
900GHz
350GHzguard band
40Gb/salien
wavelength
5x10Gb/swavelengths
5x10Gb/swavelengths
40Gb/swavelength
hr(t)
hi(t)
DAC
DAC
M-Z
M-Z 90o
CW sourceData
I
QLPF
LPF
10Gb/s Electronic Dispersion Pre-compensation
Slide courtesy of Kim Roberts, CIENA
4400 4600 4800 5000 5200 5400timeps0.5
1
1.5
2
2.5Optical PowerArb. Units
4400 4600 4800 5000 5200 5400timeps0.5
1
1.5
2
2.5Optical PowerArb. Units
z=0km z=5000km
D=-87500ps/nm
4400 4600 4800 5000 5200 5400timeps0.5
1
1.5
2
2.5Optical PowerArb. Units
4400 4600 4800 5000 5200 5400timeps0.5
1
1.5
2
2.5Optical PowerArb. Units
z=0km z=5000km
D=+87500ps/nmEDC off
EDC on
EDC (Electrical Dispersion Compensation)
Rx
Total 5000km standard transmission fiberH(f)
OA OA OA
hr(t)
hi(t)
DAC
DAC
M-Z
M-Z 90o
CW sourceData
I
QLPF
LPF
High PAPR (Peak-to-Average Power Ratio) ⇒ Low power per channel ⇒ Low OSNR ⇒ Strong FEC
Eye diagram before and after transmission with EDC
Transmitted signal (z=0km) Signal after 1600 km of NDSFwith no optical compensation
Slide courtesy of Kim Roberts, CIENA
OSNR measurement inoptically amplified system
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Optical spectrum at output of transmit OA in Amsterdam1(RB=0.5nm)
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
1526 1530 1534 1538 1542 1546 1550 1554 1558 1562 1566
Wavelength (nm)
Pow
er (d
Bm)
OSNR
OSNR measurements insystems with ROADMs
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WSS
1xN
WSS
1xN
WSS
1xN
Tx
Tx
Rx
Rx
Difficult to determine OSNR level due to data modulation
OSNR measurements in systems with ROADMs – cont’d
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WSS
1xN
WSS
1xN
WSS
1xN
Tx
Tx
Rx
Rx
1558.5 1558.6 1558.7 1558.8 1558.9 1559 1559.1 1559.2 1559.3 1559.4 1559.5-55
-50
-45
-40
-35
-30
-25
wavelength (nm)
pow
er (d
Bm
)
0.1nm resolutionAdvantest
0.1nm resolution
1558.5 1558.6 1558.7 1558.8 1558.9 1559 1559.1 1559.2 1559.3 1559.4 1559.5-65
-60
-55
-50
-45
-40
-35
-30
-25
wavelength (nm)
pow
er (d
Bm
)
0.02nm resolutionAdvantest
0.02nm resolution
1558.5 1558.6 1558.7 1558.8 1558.9 1559 1559.1 1559.2 1559.3 1559.4 1559.5-60
-55
-50
-45
-40
-35
-30
-25
wavelength (nm)
pow
er (d
Bm
0.05nm resolutionAdvantest
0.05nm resolution
Use tunable laser ⇒ no modulation but amplifier link setting remains same
JOINT SURFnet/NORDUnet 40Gb/s PM-QPSK alien
wavelength DEMONSTRATION
W S S
W S S
10G40G
10G
W S S W S S10G
40G alien wave
10G
40G
416km TWRSAlcatel-Lucent
(with dispersion compensation)
640km TWRSNortel
(without dispersion compensation)
5x10Gb/s @ 50GHz
5x10Gb/s350GHz900GHz
End-to-end FoM = 1400 (a couple of dB margin over BOL OSNR limit - set against nonlinearities and
potentially adverse effect from filter concatenation [4])
Am
sterdam
Hamburg
Copenhagen
Ham
burg40G
40G
Transmission system configuration
Error-free transmission for 30 days BER < 9.6 10-18
15
SURFnet networkGUI - Optical Modeler
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- We have investigated experimentally the all-optical transmission of a 40Gb/s PM-QPSK alien wavelength via a concatenated native and third party DWDM system that both were carrying live 10Gb/s wavelengths
- The end-to-end transmission system consisted of 1056km of TWRS (TrueWave Reduced Slope) transmission fiber
- We demonstrated error-free transmission for 30 days (i.e. BER below 10-17)
Conclusions
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Acknowledgements
The research leading to these results has received part of its funding from the European Community¹s Seventh Framework Programme (FP7/2007-2013) under grant agreement nº
238875 (GÉANT)