400g pam4 the wave of the future - ecoc exhibition focus 2017... · 400g pam4 –the wave of the...

400G PAM4 – The Wave of the Future

ECOC 2017

Michael G. Furlong - Senior Director, Product Marketingmfurlong@inphi.com

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100G is Ramping in the Cloud

100G Now Shipping (~2H2016)― Numerous Market Reports

― Millions of Ports/Year

Driven by Cloud TOR/Leaf/Spine Switching― Multiple Suppliers of 100GE Switches

― Numerous Optical Module Developers

― Low Cost DAC for Server 100G Breakout

― Competitive Pricing

Network Traffic Continues to Grow― Doubling Year/Year

― Data-intensive Applications

― Drives the Switch Bandwidth

Switch Bandwidth 400G PAM4

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256x100G

PAM4

nx100G (PAM4)

25Tb+

Data Center Switch/Optics Transitions

Sw

itch

ing

So

luti

on

s

Ele

ctr

ical

Inte

rface

Op

tics

128/256x50G

PAM4

8x50G (PAM4)

OSFP

QSFP-DDDR4

FR4

LR8ZR

FR8

SR8

Others….Public

Announcements

6.4/12.8Tb

128/256x25G

NRZ

Others….

4x25G (NRZ)

QSFP28

SR4

ER4LR4

PSM4

CWDM4

CLR4

COLORZ

Public

Announcements

3.2/6.4Tb

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Data Center Port Speed Transitions

Arista Networks Confidential 6

Ethernet Speed Transitions by Lane Speed

Lane Speed 10Gbps 25Gbps 50Gbps 100Gbps

1X 10G 25G 50G 100G

2X — 50G 100G 200G

4X 40G 100G 200G 400G

8X — — 400G 800G

Availability 2011 2015 2018 2020

Server Interface

Leaf-Spine Interface

4 Years 3 Years 2 Years

Source: Arista

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Relevant 400G Standards/MSAs

<100m

<500m

<2km

<10km

Data Center Network Topology

- 107.8x22.6x9.0mm

- Power < 16W

- TOR L/S Switches

- In Development

CFP8

- 102x40x9.5mm

- Power < 16W

- Routers

- Sampling

- 75.85x18.35x8.5mm

- Power < 14W

- TOR L/S Switches

- In Development

- Defines Electrical

I/O, Connectors,

Thermals, etc.

- In Development

Electrical Standards

802.3bs

400GAUI-8 (CDAUI-8)

IEEE802.3bs OIF

C2C CEI 56G PAM4 VSR

C2M CEI 56G PAM4 MR

802.3cd 50G PAM4 DAC / BKPL

802.3

802.3bs - Target Standard Complete Dec’17

Optical Standards400Gbase- Reach Fiber Speed Spec

LR8 10km SMF 8x50G PAM4 802.3bs

LR4 10km SMF 4x100G PAM4 MSA

FR8 2km SMF 8x50G PAM4 802.3bs

FR4 2km SMF 4x100G PAM4 MSA

DR4 500m P-SMF 4x100G PAM4 802.3bs

SR8 100m MMF 8x50G PAM4 802.3cd

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So Why 50G PAM4?

12.8Terabit Switch Bandwidth Options

1. Double the Number of Existing I/O?

● 256 I/O -> 512 I/O at 28Gbaud

● Issues: Die Size, Packaging, Cost

2. Double the Speed on Each I/O

● 28Gbaud NRZ -> 56Gbaud NRZ

● Issues: Channel Loss, SerDes Complexity, Cost, Power

3. Advanced Modulation PAM4

● Same Number of I/O

● Same 28Gbaud Speed

3 Meter DAC – Insertion Loss

56Gb PAM4

56Gb NRZ

PAM4 Meets the Performance,

Power, and Cost objectives for

400G Cloud Data Centers

Benefits of 50Gbps PAM4― Use Existing (and Fewer) 28Gb Optics

― Same Copper Infrastructure● 3 Meter DAC

● Backplanes & Connectors

― Switches can Mix / Match Cables and Optics up to 100Km in Reach

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Next Generation 400G Optical Modules

ADC- Multi-tap FFE

- Multi-tap DFE

- Slicer

8:4

Demultiplex

PAM4

Mapping &

Pre-Coder

Host Interface

8:4

Multiplex

PAM4

Mapping &

Pre-Coder

- Multi-tap FIR

- Level Control DAC

PowerLow-speed

CMOS

REFCLK

(If Needed)

PLL/Clocking

Tx FIR

Rx EQCTLE

H

O

S

T

L

I

N

E

8x50G

PAM4

TIA

(x4)

ROSA

(x4)

Linear

Driver

(x4)

TOSA

(x4)

uCPower

RegMisc

OSFP / QSFP-DD / COBO

4

4

-3

-1

+1

+3

Sample

Levels

Control

Interface

OIF CEI 56G VSR

IEEE 400GAUI-8

DSP Line Interface

Clock Recovery

Control Loops

Calibration Algorithms

Diagnostics

Internal Histograms

/Eye DiagramsSystem BER Sweeps

0

Channel SNR

21dB

• Real Time / Easy Access

• Non-destructive

• User Programmable Thresholds

Opt

Mux/

Dmux(FR4/LR4)

PAM4 DSP

8x50G

PAM4

4x

100G

PAM4

4x

100G

PAM4

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DSP Advantages For 400G PAM4

-0.5 0 0.5-4

-3

-2

-1

0

1

2

3

4

Time

Am

plit

ude

Eye Diagram

-0.5 0 0.5-1.5

-1

-0.5

0

0.5

1

1.5

Time

Am

plit

ude

Eye Diagram

PAM4 / NRZ

Eyes

-0.5 0 0.5-4

-3

-2

-1

0

1

2

3

4

Time

Am

plit

ude

Eye Diagram

-0.5 0 0.5-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

Time

Am

plit

ude

Eye Diagram

Small

ISI

Plus Noise

PAM4 More Sensitive to ISI and Noise Versus NRZ

― PAM4 has 1/3rd Eye Opening

DSP Equalization

― High Performance (DFE/FFE)

― High Number of Taps

― Proven Algorithms

DSP Performance

― Low Risk

― Enables Lower Cost Optics

Low-power CMOS Process

― 16nm Scaling 7nm

― Meets Module Power Targets

PAM4 DSPs are Low Risk and Enable Low Cost Optics

Meeting the 400G Module Power

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Next Generation Cloud – 400G PAM4 Summary

Network Traffic is Driving Switch Bandwidth

Big Data Movement

― Video

― Artificial Intelligence

― IoT

― Many Others…

Cloud

Data

Centers

Switch/Optics

Infrastructure

QSFP28QSFP-DD

OSFP

Switch Bandwidth is driving 400G Interfaces

Next Generation Switches are Coming to Market

Industry Split on Module Form Factor

Optical &

Electrical

Signaling

56Gbps PAM-4 Required to Achieve 12.8T Switch Bandwidth

Optical & Electrical Industry Standards Based on PAM4

PAM4 DSP’s Are Shipping Today

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Low PowerHigh Performance

Long Reach

Fast Time-to-market

Competitive Cost

Dedicated Customer Support

Best Quality

Inphi’s Complete Platform to Enable Customer Success

Driver

SiPho

or

Partner Optics

TiA

Optical Platform

PAM4 DSP

Coherent DSP

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Live PAM4 DSP Demonstration at ECOC 2017

Highest

Performance 50G

PAM4 DSP

Integrated

EML/VCSEL

Drivers

10G-400G

Backplane Retimer

IEEE FEC/PCS

Booth #337

400G

QSFP-DD/OSFP

Optics

COLORZ-Lite™ QSFP-28

100Gbps PAM4

20km Campus

Thank you