Transcript Production Alien Wave

Sharing Dark Fibre
Lessons from Amsterdam-Hamburg field trial
Guy Roberts
Transport Network Architect, GÉANT
TNC15, Porto
15th June 2015
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Contents
• Economic case for alien waves
• DWDM background
• Alien waves
• Field trial motivation and setup
• Field trial results
• Making this a production service
• Next steps
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The economics traditional transmission services
•
Cost structure for transmission layer:
•
Fixed one-off costs – system design costs, installation fees
•
Fixed annualized costs – common equipment depreciation, fibre lease,
equipment maintenance fee, power etc.
•
Variable costs – transponders added on a per-service basis.
•
For the first few services added, the fixed costs greatly exceeds the variable costs.
•
As new services are added the fixed costs per service falls.
•
The break-even point occurs when revenues exceed the overall cost of running the
service
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Economic theory
•
Economics textbook theory shows
that a system with fixed and
variable costs has a break-even
point.
•
At a fixed price, low volumes
result in a loss.
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Economics of alien waves
•
Alien waves allow multiple providers to share one common fibre infrastructure
•
This means that there will be more services on the fibre, and the fixed cost are shared across many
services, reducing the overall cost.
•
The collaboration model agreed between Surfnet and GÉANT is for the fixed costs to be shared
equally between each of the providers using the common fibre infrastructure.
•
In the case of Amsterdam to Hamburg this is Surfnet, Nordunet and GÉANT. In future this may also
include PSNC.
•
Common costs are reduced by 2/3s compared to GÉANT only fibre.
•
Solution also retains GMPLS control plane and ability to rapidly turn up new services.
•
TeleGeography: “huge demand (for alien waves) from non-traditional operators”
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Economics of alien waves
Actual costs for Ams-Ham
Alien Waves cost per 100Gbps
€ 200,000.00
€ 180,000.00
Annualized cost
over 3 years in
Euros
AW brings savings cf.
leased waves with only
2 x 100Gbps
€ 160,000.00
€ 140,000.00
€ 120,000.00
€ 100,000.00
€ 80,000.00
€ 60,000.00
€ 40,000.00
€ 20,000.00
€-
GÉANT Dark Fibre
Leased Wavelengths
Alien Waves
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1 x 100
€ 183,533.33
€ 65,000
€ 83,533.33
2 x 100
€ 108,533.33
€ 65,000
€ 58,533.33
3 x 100
€ 83,533.33
€ 65,000
€ 50,200
4 x 100
€ 71,033.33
€ 64,166.67
€ 46,033.33
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Alien waves growth driven by content providers
Lots of these are alien waves,
so huge growing market
Source: TeleGeography
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DWDM
Background
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Wavelength Division Multiplexing
Scaling Fiber Capacity
The light is going this way
Tx
Optical fiber
Supports scaling the data
rate per wavelength
Rx
Tx
Tx
Combining and
separating
colors of light
Transmitter(s)
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Rx
Rx
Receiver(s)
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Supports scaling the
number of waves on the
fiber
Dense wavelength division multiplexing
C band and ITU grid
• Dense wavelength division multiplexing (DWDM)
• First used the 1525–1565 nm band (C band) to make use
of erbium doped fibre amplifiers (EDFAs)
• Each wave carries a 10Gbps NRZ modulated signal
• Approx. 80 waves per fibre on 50GHz ITU-T grid
• Early systems used fixed multiplexers
• Reconfigurable Add Drop Multiplexers (ROADMs) allow
wavelengths to be switched and add/dropped under
network management control
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Alien Wave
Field trial
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Alien Waves
Do aliens and lasers mix?
Alien Waves
• ‘Alien’ refers to data transmission laser light from 3rd party equipment
• An alien wave system multiplexes alien light together with local signals
using Dense Wavelength Division Multiplex (DWDM) technology.
Field Trial
• GÉANT has made use of SURFnet’s dark fibre to carry GÉANT DWDM trunks.
• Field trial is now complete and showed excellent results
• A production service is now planned
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GÉANT fibre infrastructure
Amsterdam-Copenhagen-Hamburg-Frankfurt
• Two stretches of Telia
Sonera fibre
• Ams-Cop
• Fra-Cop
• Telia Sonera fibre
expires Aug 2015.
• Decision has been
made to not renew the
contract.
• Copenhagen PoP will
close
• Need are new solution
for Amsterdam to
Hamburg
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Amsterdam – Hamburg fibre
Eliminating redundant fibre infrastructure
• R&E community has two parallel
fibre systems between
Amsterdam and Hamburg.
• Yellow cable is Surfnet.
• Green cable is GÉANT.
• Duplication of infrastructure
dilutes utilization.
• Objective 1: remove one fibre
system and share remaining
fibre
• Objective 2: retain GMPLS
control plane
• Solution: alien waves
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Field Trial
The setup
Phase I
• Tested the technology and operational procedures.
• Objective was to understand if GÉANT can make use of SURFnet’s dark fibre to carry our DWDM
trunks.
Fixed Filters
• Phase I used fixed filters to insert alien waves
• Convenient for fast trial, but does not scale well
• After successful competition of trail, the production solution will use ROADMs
• ROADMs allow waves to be remotely turned up and reduces inter-site fibres
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Field Trial
Connectivity
Pair of loan
AOLMs in the
blue spectrum
(OCG 2)
DANTE
Amsterdam
SURFnet
Amsterdam
SURFnet/Ciena
line system
6500 CPL
SURFnet
Hamburg
Nx
amps
DANTE
Hamburg
Pair of loan
ATCs with OLA
and OFM-4-D
6500 CPL
AOLM500
AOLM500
ATC
ATC
AOLX500
Switch
Matrix
Nx
amps
AOLX500
AOLX500
AOLX500
OTC
Existing AOLX on
OCG 7
AOLX500
OTC
DTN-X
DTN-X
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Existing DANTE fibre
Switch
Matrix
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Alien Wave
Excellent receive margin
• Receive sensitivity measured on two wavelengths in each direction
• Better than 10 dB receive margin in both directions – i.e power into Rx can fall by 10dB
before errors are seen
AOLM-500-T4-1-C5 Amsterdam re-FEC sensitiviy
1.00E-02
1.00E-02
1.00E-03
1.00E-03
1.00E-04
1.00E-04
Ham 1556.56nm
Ham 1554.94nm
1.00E-05
1.00E-06
pre-FEC BER
pre-FEC BER
AOLM-500-T4-1-C5 Hamburg Pre-FEC sensitiviy
Ams 1556.56nm
Ams 1554.94nm
1.00E-05
1.00E-06
12dB
10dB
1.00E-07
-30
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-25
-20
-15
channel
Rx power (dBm)
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-10
1.00E-07
-30
-25
-20
-15
Channel Rx power (dBm)
-10
17
Field Trial
Test results – robust to input power variation
pre-FEC BER vs insertion loss at point of
insertion of alien wave into fibre
• Power injection is reduced at two points:
•
•
1.00E+00
1.00E-01
1.00E-02
1.00E-03
Where the AW signal is injected into the fibre
Where the AW signal is injected into the Ciena equipment
• In both cases the reduction in power did not result
in a significant change in the pre-FEC BER.
1.00E-04
1.00E-05
1.00E-06
1.00E-07
-3.5
-3
-2.5
-2
1556.56
-1.5
-1
-0.5
0
1554.94
• Demonstrates that system is stable under power
level changes.
Pre-FEC BER @ AMS vs insertion loss at input to
Ciena mux @ HAM
1.00E+00
Technical contributions from Rob
Smets from SURFnet and the GÉANT
Operations team
1.00E-01
1.00E-02
1.00E-03
1.00E-04
1.00E-05
1.00E-06
1.00E-07
-7
-6
-5
-4
1556.56nm
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-3
-2
-1
0
1554.94nm
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Field Trial
Test results – Infinera alarms allow debugging of alien wave
Alarms and notification aid debugging: four types signal deterioration can be distinguished
1.
If there is a loss of fidelity of the signal, this can be detected using pre-FEC threshold crossing notification
2.
If the alien wave becomes so degraded that the Q-factor drops below 10, Infinera will raise a pre-FEC Q
out of range alarm
3.
A cut in the SURFnet fibre results in a Loss of Frame (LOF) alarm, some signal from the optical amplifiers
leaks through, so there will not be a Loss of Signal (LOS) alarm.
4.
If the local patching between GÉANT and SURFnet sites is broken, then a Loss of Signal (LOS) alarm is
raised.
Infinera pre-FEC Q out of range alarm
Infinera Loss of Frame alarm
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Production Alien Wave
Flexible solution uses ROADM technology
• These positive field trial results mean that GÉANT will go ahead and work with SURFnet to a solution that
scales up to 5 x 100G of alien waves from Amsterdam to Hamburg.
• The production solution will use ROADMs for a more scalable solution.
• The addition of Wavelength Selective Switches (WSS) on the drop side of the SURFnet ROADMs adds
support for colourless add-drop.
• This means that the multiplexed set of 10 x 50Gbps waves from the Infinera Photonic Integrated Circuit
(PIC) can be injected straight into the Ciena ROADM without the need for fixed mux/demux.
• Reduces the number of optical patch cords between GÉANT and SURFnet racks.
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Production Alien Wave
Connectivity
SURFnet Amsterdam PoP
GÉANT Amsterdam PoP
Up to 10 waves of 50Gbps
each on single fibre pair
DTN-X
OTM
AOLX500
Switch
Matrix
OCG-7
AOLX500
Ciena
6500 CPL
TrueWave
reduced slope
fibre
WSS
AOLX500
WSS for Directional
Independent
Access (DIA) line side
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WSS
Production Alien Wave
Installation, Testing and Commissioning
• CPL Nodes at Hamburg and Amsterdam have been upgraded beginning of June 2015
• Multiplexing per group node converted to to full ROADM node with WSS-based DIA add/drop
function and per channel power monitoring.
• New and lower noise EDFAs on line side slightly kept PRE-FEC of existing waves at par with the 10
alien waves enabled.
• 4 hour joint GEANT-SURFnet activity, incl. wave alignment.
• DIA amplifier levels power to -0.4 dBm per wave for both add & drop directions.
• Padding at ODFs to GEANT to fix power levels close to sweet stop of AOLX
• DIA amplifier gain and/or output power designed to accommodate large power acceptance (add) or
power delivery (drop)
• Add: 14dB range: -10dB to +4dB
• Drop: 10dB range +6dB to -4 dB
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Production Alien Wave
• Preliminary Results
• Two waves (100G) error free on client for 96 hours
• Remaining waves error free for 2 hours.... and counting
• Pre-FEC values in the range of 1.7 e-6 to 2.5 e-5
• Escalation matrix & operational procedures to be finalized
• Fiber Launch Power to be optimized
Hamburg
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Amsterdam
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Alien Waves
Next steps
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Hamburg - Poznan
The concept
OTM
To
Amsterdam
AOLX500
GÉANT Poznan
German/Polish border
GÉANT Hamburg
Switch
Matrix
AOLX500
Light GÉANT
Dark Fibre
Alien wave
over DFN
New
XTC-4
New
XTC-4
DTN-X
GEANT
Frankfurt
2 x 10G
2 x 10G
upgrade to
1 x 100G
GEANT
Prague
OTM
To
Amsterdam
AOLX500
Switch
Matrix
AOLX500
DTN-X
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To Milan
AOLX500
AOLX500
DTN-X
Switch
Matrix
OTM
AOLX500
To Bratislava
Hamburg - Poznan
Connectivity
• The engineering solution makes use of an alien wave over the DFN network from Hamburg to
Frankfurt an der Order (on the Polish/German border).
• The alien waves are sourced from the Infinera equipment and are carried on the DFN’s ECI
DWDM equipment.
• The Polish part of the system uses Infinera equipment to light GÉANT dark fibre leased from
PSNC between Slubice and Poznan.
• The section from Slubice to Frankfurt a. d. Order will be leased from the University of Frankfurt
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Hamburg - Poznan
Connectivity
DFN
Frankfurt adO
DFN
Hamburg
GEANT
Hamburg
GEANT
Frankfurt adO
OTM
To
Amsterdam
AOLX500
Switch
Matrix
AOLX500
DTN-X
•
•
•
ECI
ROADM
Colourless
add/drop
port
DFN
ECI
network
ECI
ROADM
Colourless
add/drop
port
To
Poznan
AOLM500
Switch
Matrix
AOLM500
DTN-X
Output of Infinera AOLX/AOLM can connect straight into the add/drop port of the ECI ROADM
An XTC-4 chassis with a pair of AOLMs is needed in Frankfurt a. d. Oder.
The results of the trial phase will be used to determine the exact configuration for a production grade service
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Summary
•
Alien waves have been used for some time now in the NREN community.
•
Cost analysis shows that alien waves will help the community save operational costs.
•
A field trial of GÉANT alien waves over SURFnet equipment has been performed
•
The field trial demonstrated stable operation.
•
GÉANT’s first production alien wave will be on the Amsterdam-Hamburg section.
•
A further trial is planned for Hamburg to the Polish border.
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[email protected]
Thank you and any questions
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