Driving the Optical Reboot: Technical Advances Towards Terabit Networking
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Transcript of Driving the Optical Reboot: Technical Advances Towards Terabit Networking
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Driving the Optical Reboot: Technical Advances Towards Terabit Networking
Geoff BennettDirector, Solutions & Technology
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Coined by Andrew Schmitt from Infonetics
• Describes the transformation (as opposed to evolution) of optical transport networks in response to an exponential growth in demand
• Characteristics include:• The move to coherent transmission• The need for integrated OTN switching• The need for CDC ROADM technology• The need for a dynamic control plane (eg. GMPLS)
What is the “Optical Reboot”?
This will be the focus for my presentation
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Coherent technologies enable 100Gb/s transmission, with outstanding reach and spectral efficiency
But how do we continue to scale the operational aspects of coherent technology?• Moving beyond 100Gb/s per channel • Coherent super-channels
Engineering the “ideal super-channel”• The move to multi-carrier• The role of photonic integration
Agenda
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The “miracle” of coherent transmission
LaserModulator
Photodetector
A simple transmitter, and even simpler detector with no
significant signal processing
10Gb/s per channel80 channels = 800Gb/s
A complex transmitter, and even more complex detector with very
significant signal processing
100Gb/s per channel80 channels = 8Tb/s
Tx
Rx
Tx
Rx
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Internet demand is growing at 30-40% CAGR:How do we go “Beyond 100G”?
100Gb/sCoherent
TechnologyToday the opto-
electronics does not have the power to
sample beyond about 32GBaud
Delivers 100Gb/s, single carrier, PM-QPSK
with 3,000km reach
Wait for the electronics to “catch up”
Competitive disadvantage
Use “higher order” modulation (eg. 16QAM) to take the load off
the electronics
Use multi-carrier super-channels
Broad industry consensus that super-channels are the way forward for >100G
Complementary techniques
16QAM is a “metro reach”
modulation
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190 GHz
1 Laser4 modulators160 Gbaud ElectronicsTime to Market: ~7 years
Moving to multi-carrier super-channels
Must be spectrally efficient, and possible to manufacture
500Gb/sSC-PM-QPSK
Single Carrier
190 GHz
2 Lasers8 modulators80 Gbaud ElectronicsTime to Market: ~5 years
Dual Carrier500Gb/s
DC-PM-QPSK
10 Lasers40 Modulators16 GBaud electronicsTime to Market: NOW
190 GHz
Ten Carrier500Gb/s
10C-PM-QPSK
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Coherent Super-Channel Tx circuit is complex Coherent Super-Channel Rx circuit is even more complex Unless…
Controlling the “Component Explosion”:The Power of Large Scale PICs
Optical Functions Integrated >600Fiber Connections Eliminated ~250
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PICs Deliver Massive Capacity:With Lower Power and Space
SUPER MZ
SUPER MZ
SUPER MZ
SUPER MZ
SUPER MZ
SUPER MZ
SUPER MZ
SUPER MZ
Optical(Photonics)
3rd party optics
3rd Gen 500G PIC.78W / Gbs
2.8 W / GbpsInfinera est. for currently avail. product operating at 25°C
500G Module Example
ConventionalSolution
Coherent(Electronics)
FlexCoherent™Processor (FCP)
Coherent ASIC
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Rahn, J.; Sun, H.; Wu, K.T.; Basch, B.E. IEEE Journal of Lightwave Technology, 2012, Issue 99: Real-Time PMD Tolerance Measurements of a PIC Based 500Gb/s Coherent Optical Modem
500G Tx Module 500G Rx Module
• Industry leading performance• Peak PMD tolerance to 500ps• Tolerant to high speed PMD transients
– 10,000 rad/s
PICs deliver performance without compromise
+
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Scaling with FlexCoherent Super-Channels
Software Selectable Ability to optimize reach vs. capacity on a given link• Per super-channel modulation format control
Infinera: Leading the way forward in coherent technology
Reach Capacity
PM-16QAM
PM-8QAMPM-QPSK
PM-BPSK
6000
3000
1500
700
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100G Line Card100G Line Card100G Line Card100G Line Card100G Line Card
Without Super-Channels
The way 500Gb/s is brought into service today
Bulky Power-hungry Does not scale operationally
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With Super-Channels
LineCard
A super-channel implements multiple carriers - ideally in a
single line card…
It has excellentoptical
performance
All carriers provisioned in
single operational cycle…
And is seen as asingle unit of capacity
by the services that use it
It’s practical to build…
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Heavy Reading White PaperAvailable free at : www.infinera.com/solutions/whitepapers.html
“As suppliers look to 100G and beyond, we are hearing an increasing consensus among them that the super-channel is the best solution.”
“As we move to the 100G era and beyond, theuse of photonic integration becomes more pervasive and, ultimately, mandatory.”
Sterling PerrinSenior Analyst, Heavy Reading
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The Submarine Networking Reboot:Match Transmission Capacity to Useful Cable Life
Useful life of typical submarine cable
25-30 yearsbut…
30% CAGR for 25 years
>700 times increase
“Evolution” of the line system can only deliver a limited increase in capacity – to meet predicted demand increase, an “optical reboot” is essential
Original submarine line
system
Phase 1 upgrade
2.5G->10G
Phase 2 upgrade
10G – 100G
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CT ROTA
TENERIFEGRAN CANARIA
CT NOBEL
OJOS DE GARZA BMH
LA PALMA
CT CALP
CT GRANADILLA(NAP D-ALiX)
CT EL GORO
GRANADILLA BMH
CANDELARIA BMH
BAJAMAR BMH
CT GUIMAR TINOCA BMH
CT CONIL
PENINSULA
LA BALLENA BMH
CONIL BMH
ASILAH BMH
MARRUECOS
CT SEV-ADIFCT SEV-TELVENT
CT JEREZ
CANALINK Network Deployment
Phase 1PIC-based line system delivers ~10X capacity
increase
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Americas>25,000km
Pacific Coast>7000km
S. America>20,000km
Line System Upgrades are Growing Rapidly
Trans-Atlantic>6000km
Trans-Atlantic>13,000km
Middle East>10,000km
Mediterranean>4000km
Japan450km
Asia Regional>16000km
40/100G Trials(Subset)
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NREN Backbone Reboot: DANTE GEANT3
Infinera DTN-X500G, PIC-based, super-channel line cards
Up to 1Tb/s per slot in chassis5Tb/s non-blocking OTN switch
Evolution to MPLS-TPUp to 8Tb/s per fiber (C-Band)
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The optical reboot is about revolution, not evolution A move to coherent transmission produces at least a
10X improvement in spectral efficiency, and usually an improvement in optical reach
Super-channels offer a way to scale network operations for coherent technologies• 5X or 10X the backbone capacity for the same operational effort
Photonic integration is essential for the implementation of practical super-channels
Summary: What I talked about today
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Integrated switching is vital part of the optical reboot• Essential for the efficient use of 100G and super-channel capacity• Enables effective control planes
ROADM technology is in a state of flux today• Ongoing challenge to deliver full CDC economically• About to encounter the move from fixed grid to flexible grid
Dynamic control planes drive down OpEx• But they require digital switching to work effectively• GMPLS is the proven technology today• SDN looks like it can solve several interesting problems, but is immature
in the context of transport networks
Summary: What I did not talk about today
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Thank YouGeoff [email protected]