What comes after 100G? - IEEE ComSoc- · PDF file1 | Infinera Confidential & Proprietary What...

1 | Infinera Confidential & Proprietary

What comes after 100G? DWDM Super-channels

Abhijeet Deore

Senior Manager, Solutions Marketing

Infinera Corp.


Agenda

What is a super-channel?

Practical implementation issues

Super-channel related standards

Infinera Super-channel Vision


What is a “super-channel” Why do service providers need this technology?

10G DWDM

500G Super-Channel

1998

1 Tb Super-Channel

Traffic Growth

2000 2010 2014

40G DWDM

100G DWDM

2012 2002 2004 2006 2008

2.5G DWDM

Cloud

Video

Mobile

Broadband

Super-channel: several optical carriers combined to create a channel of desired capacity

Turn up more capacity in a single operational cycle

Scale fiber capacity and reach

Support next generation data service rates


100G Line Card

100G Line Card

100G Line Card

100G Line Card

100G Line Card

100G Line Card

100G Line Card

100G Line Card

100G Line Card

100G Line Card

How do we get to >100G ?

The way 1Tb/s is brought into service today

Bulky

Power-hungry

Does not scale operationally

//upload.wikimedia.org/wikipedia/commons/3/37/Clock.gif


What are the properties of a super-channel?

Line Card

A super-channel implements multiple carriers - ideally in a

single line card…

It has excellent optical performance

All carriers are provisioned in a single

operational cycle…

And is seen as a single unit of capacity

by the services that use it

It’s practical to build…


10 Lasers 40 Modulators 32 GBaud electronics ~32nm Silicon Time to Market: ~1 year

375 GHz 375 GHz

2 Lasers 8 modulators 160 Gbaud Electronics ~16nm Silicon

Time to Market: ~7 years

1 Tb/s PM-QPSK

375 GHz

1 Laser 4 modulators 320 Gbaud Electronics ~ 11 nm Silicon Time to Market: ~10 years

Why do we need multi-carrier super-channels?

C Band

Must be spectrally efficient, and possible to manufacture


PM-QPSK is the modulation technique of choice for 100G

So what is the impact of moving to higher order modulation (e.g. 16QAM)?

The Short Answer:

Increased spectral efficiency

Shorter optical reach before regeneration needed

Moving to higher order modulation


BPSK

+ Coherent Detection

1 bit per symbol

More Bits per Symbol: Optical Performance vs Fiber Capacity

QPSK 2 bits per symbol

8QAM 3 bits per symbol

16QAM 4 bit per symbol

Decreasing Reach

More bits per symbol = shorter reach

Increasing Capacity


Types of super-channel (IETF Terminology)

Split Spectrum

500 GHz*

G.694.1 50GHz Grid

Contiguous Spectrum (aka “FlexGrid”, “gridless”)

375 GHz

Pros: Backwards compatible with ITU grid-based ROADMs and line systems

Cons: 25% “wasted” spectrum due to guard bands between channels

Pros: Reclaim 25% “wasted” spectrum

Cons: Incompatible with legacy WSS ROADMs (fixed ITU grid)

*Illustrative only; non-contiguous carriers


1T PM-16QAM 5 carrier SC (200 GHz)

1T PM-QPSK 10 carrier SC (375GHz)

ITU-T: Grid vs Flex Grid

50GHz

100G PM-QPSK

SC DC

12.5GHz

The “classic” 50GHz grid works well up to 100G

But what if you need, eg. a 1Tb/s PM-QPSK super-channel? • Use a 12.5GHz granularity FlexGrid

• Should work for most permutations


Component standardization • Possible that OIF will extend its 100G work to cover super-channels

ITU-T G.694.1 Grid • A flex grid has been approved, based on 12.5GHz granularity

ITU-T SG15, Question 11 (aka “OTUadapt”) • Requirement emerging for flexible container sizing (cf. ODUFlex)

• Proposed by Infinera, Finisar and Verizon

IETF CCAMP • Generalized Label for Super-Channel Assignment on Flexible Grid

• Infinera and VZ co-author

• OSPFTE extension to support GMPLS for Flex Grid

• Infinera author

Line-side interoperability • Currently not a goal for the standards bodies

Super-Channel Standards Work


Infinera Super-channel Vision


Infinera Vision for Practical Super-Channels The 3 Pillars

PIC-based implementation

Integrated OTN switching

FlexCoherent modulation


Why PIC’s make sense for super-channels ?


Large Scale PIC Implementation: More Compact, More Efficient, More Reliable

PIC

A super-channel implements multiple carriers - ideally in a

single line card…

PICs • Simpler • Lower power • Higher reliability

Excellent optical performance

All carriers are provisioned in a single

operational cycle


PICs are the ideal way to implement super-channels Reliability and density are key issues…

The MTBF is about the same per card

Competitor 100G line side card Infinera 500G super-channel

Competitive implementations need five cards to equal capacity

Competitor 500G line side cards

Competitive implementations need ten cards to equal capacity

Infinera 1T super-channel Competitor 1T line side cards

Infinera PIC’s have surpassed 650 Million field hours with zero failures


Switching is essential


40% fill λ 8 x

sub-λ

Need for digital switching is increasing Switching is essential to maximize λ utilization

1 x 10G λ 4 x 10G λ

λ 3 x 10G

26% Fill 80% Fill

Service rate ≠ Optical channel rate → Digital Switching Required

2017 Optical channel

1T Super-Channel

Sub 10G

10G

40G

100G

(Source: Ovum)

2017 Service mix

Example, Circa 2012


FlexCoherentTM makes Super-channels useable


FlexCoherent = “Dial-a-Reach”

Ability to optimize reach vs. capacity on a given link is key • Per super-channel modulation format control

FlexCoherentTM enables practical trade-offs With a single operation

Ability to change modulation formats on the fly a must…

Reach Capacity

PM-16QAM

PM-QPSK

PM-BPSK


B X

C

A

Metro

Long Haul

Subsea

1Tb/s PM-QPSK Super-Channel

1Tb/s PM-16QAM Super-Channel

1Tb/s PM-BPSK Super-Channel

FlexCoherentTM Modulation Maximize flexibility, Minimize complexity


Super-Channels are the answer to the question “what comes after 100G?”

They address three key problems of scale • Turn up more capacity in a single operational cycle

• Extract more total capacity from the fiber

• Support next generation services “beyond 100G”

Key implementation criteria: • Large Scale Photonic Integration

• FlexCoherent Modulation

• Integrated OTN Switching

Summary


Thank You

What comes after 100G? - IEEE ComSoc- · PDF file1 | Infinera Confidential & Proprietary What...

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