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


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


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


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


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


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


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


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


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

+


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


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


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…


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


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


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


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)


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)


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


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


Thank YouGeoff [email protected]

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Driving the Optical Reboot: Technical Advances Towards Terabit Networking