© 2015 Xtera Communications, Inc. Proprietary & Confidential 1
Super Optical Layer Enabled by 16QAM and Raman Technologies
Bertrand Clesca – Head of Global Marketing – Xtera Communications23 June 2015
Next Generation Optical Networking 2015 (22-25 June 2015 – Nice, France)
© 2015 Xtera Communications, Inc. Proprietary & Confidential 2
Content:
• Why Long Spans Matter • Recent Technical Improvements
Enabling Longer Span (and Reach)• Example of Implementation• Raman Amplification, Key Enabler for 16QAM
© 2015 Xtera Communications, Inc. Proprietary & Confidential 3
Why Long Spans Matter
© 2015 Xtera Communications, Inc. Proprietary & Confidential 4
• Very meshy network with a lot of traffic locations
• Fibers owned, plenty of dark fibers available
Traditional Telecom Network
© 2015 Xtera Communications, Inc. Proprietary & Confidential 5
• Very sparse network with very few traffic locations long reach
• Fiber leased, but large pipes needed between few sites
• Technical/commercial benefits from site skipping long spans
Data Center Operator Network
© 2015 Xtera Communications, Inc. Proprietary & Confidential 6
• Technical + commercial innovations
• Instead of having back-to-back terminal equipment in red sites, long span capabilities enable to deploy optical line amplifiers in red sites or to skip some of these red sites.
Backhaul Networks for Subsea Cable Systems
London
Dublin
© 2015 Xtera Communications, Inc. Proprietary & Confidential 7
• Network made of leased fibers with few traffic locations
• Sparse population distribution and power availability issues long spans
Emerging Region Network
© 2015 Xtera Communications, Inc. Proprietary & Confidential 8
• Optical networks built over power grids
• By design, the fiber is routed to the foot of the transmission tower at very few locations long spans
OPGW Network
© 2015 Xtera Communications, Inc. Proprietary & Confidential 9
• Example in Papua New Guinea: Long spans imposed by the location of the liquid gas fields and plants
• Valid also for off-shore (and onshore in Middle East) oil rigs
Oil & Gas Industry’s Network
Hides GasConditioning
Plant
Kopi Scraper
266 km
Port Moresby
436 km
LNG plant
© 2015 Xtera Communications, Inc. Proprietary & Confidential 10
• New types of telecom networks with very few traffic locations– New players
– DC/PoP-to-DC/PoP network with subsea piece in the middle
• Deserts, mountains, rain forest or tundra are all examples of areas where intermediate amplifier sites can be prohibitively expensive to build, power, maintain and keep secure.
– Telecom networks in emerging countries with sparse populations distribution
and power availability issues
– Optical networks built over power grids
– Oil & gas industry
Why Long Spans Matter?
© 2015 Xtera Communications, Inc. Proprietary & Confidential 11
Recent Technical ImprovementsEnabling Longer Span (and Reach)
© 2015 Xtera Communications, Inc. Proprietary & Confidential 12
Optical Transmission Over Long SpanToo High Power: Nonlinear Limitation
Input eye diagram(NRZ signal)
Output eye diagram
Distance
Per
channel pow
er
pro
file
Nonlinear limitation
Amplifier power boost
Fiberattenuation
Pulsecompression(or distorsion)
© 2015 Xtera Communications, Inc. Proprietary & Confidential 13
Optical Transmission Over Long SpanToo Low Power: Noise Limitation
Opticalamplifier noise
Input eye diagram(NRZ signal)
Output eye diagram
Distance
Per
channel pow
er
pro
file
Amplifier power boost
Fiberattenuation
Noise limitation
© 2015 Xtera Communications, Inc. Proprietary & Confidential 14
Optical Transmission Over Long SpanLimitations on Both Sides
Input eye diagram(NRZ signal)
Output eye diagram
Per
channel pow
er
pro
file
Nonlinear limitation
Amplifier power boost
Noise limitation
Fiberattenuation
Pulsecompression(or distorsion)
Opticalamplifier noise
Distance
© 2015 Xtera Communications, Inc. Proprietary & Confidential 15
Optical Transmission Over Long SpanRaman Enabler: Line Fiber Becomes An Amplifier
Distance
Per
channel pow
er
pro
file
Fiberattenuation
Backward gain
Forward gain
BackwardRamanpumping
ForwardRaman
pumping
Adequate eye opening for proper signal detection
Input eye diagram(NRZ signal)
Output eye diagram
© 2015 Xtera Communications, Inc. Proprietary & Confidential 16
[Capacity – Reach] in Unrepeatered Links
© 2015 Xtera Communications, Inc. Proprietary & Confidential 17
Raman-Assisted TransmissionFor Multi-Span Transport
DistancePer
channel pow
er
pro
file
Lower limit: Optical noise accumulation
Upper limit: Nonlinear distortions
Highpeak-to-peakpowerexcursion
EDFA chain
A B C D E F
Powerboost
Fiberattenuation
Much lessbreathing
Higher noise performance
Raman chain
Lower non-linearity
A
Backward Raman pumping Forward Raman pumping
Fiber attenuation
Distributed Ramangain
B C D E F
Discreteamplifier
© 2015 Xtera Communications, Inc. Proprietary & Confidential 18
Raman-Assisted TransmissionFor Multi-Span Transport – All-Distributed Raman
DistancePer
channel pow
er
pro
file
Lower limit: Optical noise accumulation
Upper limit: Nonlinear distortions
Highpeak-to-peakpowerexcursion
EDFA chain
A B C D E F
Powerboost
Fiberattenuation
Further lessbreathing
Higher noise performance
All-distributed Raman chain
Lower non-linearity
A D
Backward Raman pumping Forward Raman pumping
Distributed Ramangain
Fiberattenuation
B C E F
Loss due to Raman amplifierinsertion loss
© 2015 Xtera Communications, Inc. Proprietary & Confidential 19
Example of Implementation
© 2015 Xtera Communications, Inc. Proprietary & Confidential 20
Power GridsInfrastructure Suitable for Optical Networks
• OPGW cable between transmission towers
• Not a telco network:– Long distances
between intermediate
ODF sites
© 2015 Xtera Communications, Inc. Proprietary & Confidential 21
Power GridsInfrastructure Suitable for Optical Networks
• OPGW cable between transmission towers
• Not a telco network:– Long distances
between intermediate
ODF sites
– Telecom sites maybe
off the power grid
© 2015 Xtera Communications, Inc. Proprietary & Confidential 22
Power GridsInfrastructure Suitable for Optical Networks
• OPGW cable between transmission towers
• Not a telco network:– Long distances
between intermediate
ODF sites
– Telecom sites maybe
off the power grid
Very long spans
© 2015 Xtera Communications, Inc. Proprietary & Confidential 23
TIM BrasilLong Links with Ultra-Long Spans on OPGW Cables
1,161 kmlink
Amazonas Project: 2,266 km network(1,835 km OPGW cable
infrastructure)
ManausGopa
Macapá
Belem
JurupariFortaleza
Salvador
Tucuruí
Puerto Velho
Cuiabá
1,010 kmlink
1,645 kmlink
TIM BrasilLong Links with Ultra-Long Spans on OPGW Cables
© 2015 Xtera Communications, Inc. Proprietary & Confidential 24
Ultra-Long Spans in 2,266 km Amazon Network(Highest Span Loss: 63 dB)
ROADM
43 km13.9 dB
237 km53.8 dB
278 km63.1 dB
ILAILA ROADM
142 km34.6 dB
ILA
138 km33.1 dB
235 km53.5 dB
ILAVilla
Camburão
ROADM
183 km46.1 dB
141 km33.9 dB
157 km37.2 dB
ILAILA ILA
91 km23.8 dB
ILA
229 km52.8 dB
ROADM
239 km54.2 dB
110 km27.2 dB
ROADM
ILA ILA
43 km13.9 dB
ManausTIM
Terra SantaManausRod Lexuga
Silves Oriximiná
MacapáTIM
Jurupari
Macapá Sub Laranjal do Jari
Gopa XinguTucuruí Pacaja Vitória do Xingu
Coreamplifier
Backward spanextension module
Forward spanextension module
G.652fiber span
© 2015 Xtera Communications, Inc. Proprietary & Confidential 25
• Wise RamanTM solution backed by:– An unrivalled 17 years of tremendous and unique R&D experience
– An unparalleled 11 years of commercial deployments worldwide
• Wise RamanTM solution covers all the aspects of optical networks relying on Raman amplification:
– Modeling
– Photonics
– Link engineering
– Network design
– Hardware
– Firmware
– Software
– Network management
Not simply the addition of third-partyRaman pump modules to EDFA amplifiers that were designed for stand-alone usage!
Wise RamanTM By Xtera
Raman amplifier controller is key, and quite different from EDFA controller.
© 2015 Xtera Communications, Inc. Proprietary & Confidential 26
Raman Amplification,Key Enabler for 16QAM
© 2015 Xtera Communications, Inc. Proprietary & Confidential 27
100/200/400G Implementations
Polarization Multiplexing(PM)
Multi-level modulationformat
25 Gbaud opto-electronics
Dual-carrierimplementation
N-level modulation format + Coherent detection + Digital signal processing
25 Gbaud 200 Gbit/s100 Gbit/s
16QAM200GPM-16QAM
I
Q
1011
1010
1101
1111
1001
1000
1100
1110
0010
0000
0100
0101
0011
0001
0110
0111
25 Gbaud 100 Gbit/s50 Gbit/s
QPSK100GPM-QPSK
00
I
Q
10
1101
l
400 Gbit/s
25 Gbaud 200 Gbit/s100 Gbit/s
16QAM400GDC-PM-16QAM
I
Q
1011
1010
1101
1111
1001
1000
1100
1110
0010
0000
0100
0101
0011
0001
0110
0111
≈ 50 GHz
(or narrower)
© 2015 Xtera Communications, Inc. Proprietary & Confidential 28
• Higher OSNR requirement
• Higher sensitivity on fiber nonlinearities
Practical reach in real network environment with EDFA-based equipment: 600 km.
• 400G or 1T channels are made, today, on the combination of2 or 5 x 200G PM-16QAM carriers.
• Higher-end line equipment is required to extend the optical reachof PM-16QAM carriers.
16QAM Challenges
25 Gbaud 200 Gbit/s100 Gbit/s
16QAM200GPM-16QAM
I
Q
1011
1010
1101
1111
1001
1000
1100
1110
0010
0000
0100
0101
0011
0001
0110
0111
© 2015 Xtera Communications, Inc. Proprietary & Confidential 29
[Capacity – Reach] Metric Enabled byXtera’s Wise RamanTM in Terrestrial Networks
240 x 100G• 100 nm spectrum• PM-QPSK 100G carriers with
50 GHz channel spacing• 2 bit/s/Hz spectral efficiency
120 x 400G• 100 nm spectrum• PM-16QAM 200G carriers
spaced 50 GHz apart• 4 bit/s/Hz spectral efficiency
160 x 400G• 100 nm spectrum• PM-16QAM 200G carriers
spaced 37.5 GHz apart• 5.3 bit/s/Hz spectral efficiency
16QAM on more than 2,000 km of aged terrestrial fiber (0.28 dB/km)
© 2015 Xtera Communications, Inc. Proprietary & Confidential 30
[Capacity – Reach] Metric Enabled byXtera’s Wise RamanTM in Terrestrial Networks
© 2015 Xtera Communications, Inc. Proprietary & Confidential 31
Innovative Supplier Of Long-Haul Optical
Transmission Infrastructure
Aerial
Terrestrial
Submarine
Top Related