next gen optical transport: from 100 gb/s to 1 tb/s and beyond

Next Gen Optical Transport From 100Gb/s to 1Tb/s and Beyond

Drew Perkins: CTO, Infinera

The key building blocks to achieving Terabit transport are well understood

Successful implementation requires more than just functionality, it must also enable end-user differentiation

Optical Programmability, Photonic IC’s & Switched DWDM are essential to ensuring success

2 © 2011 Infinera Corporation Confidential & Proprietary

What I want you to take away from this presentation

A Better Way to 100G

3 © 2011 Infinera Corporation

Technological Approaches to Increase Link Capacity

Time Division Multiplexing (ie: Baud Rate)

10 Mbps

100 Mbps

1 Gbps

10 Gbps

100 Gbps

Space Division Multiplexing (ie: Parallel Optics)

1

4

12

8

Modulation (ie: Bits per Hz)

1 (e.g. NRZ)

2 (e.g. PAM-4, (D)QPSK, QAM-4)

4 (e.g. QAM-16)

8 (e.g. QAM-256)

Wavelength Division Multiplexing

(i.e. ls) 1 2 4 6 8 10

DWDM CWDM

© 2011 Infinera Corporation

Advanced Modulation Formats

Pol-Mux QPSK Pol-Mux

8-QAM

Pol-Mux 16-QAM

IM-DD

PM- BPSK

1.6 8 12 16 24

C-Band Capacity (Tb/s)

0

0.2

0.4

0.6

0.8

1

1.2

Cap

acit

y *

Re

ach

Pro

du

ct


wavelength demux

DWDM Direct Detection

PD

Spacing on the fiber needed between waves: “Guard Bands”

Spatially separate the

channels using a

wavelength demux


wavelength demux

Spatially separate the

channels using a

wavelength demux

DWDM Coherent Detection

Spacing on the fiber needed between waves:

“Guard Bands”

ADC DSP PD LO

Use a local oscillator to choose the “color” we want

to “detect” to match the demux port color


Large Scale Photonic Integration is essential

500G Tx PIC

500G Rx PIC

Number of channels 5 x 100G

Monolithic InP Chips 2

Optical elements > 600

“Gold Box” Replacements > 100

Fiber Replacements > 400

COST

SIZE

POWER CAPACITY

RELIABILITY


More practical implementation • Lower cost

• Smaller footprint

• Higher reliability

FlexCoherentTM (Programmable) Modulation • Build more functions into one ASIC

• Amortize ASIC cost over multiple wavelengths

Switched DWDM - Everywhere • Making more bandwidth available for revenue generating services


For 100G, Large Scale PICs Enable…

Beyond 100G: The Dawn of the Terabit Age


A Vision for the Next Generation Terabit Networks

© 2011 Infinera Corporation 11

1Tb/s Single Carrier: The A/D Converter Problem

1 2 4 6 8 10 12

1

2

3

4

5

6

7

8

9

10

OSN

R P

enal

ty (

dB

)

Number of bits per symbol

PM-BPSK 640GBaud

PM-QPSK 320GBaud

PM-8QAM 210GBaud

PM-16QAM 160GBaud

PM-32QAM 128GBaud

PM-64QAM 105GBaud

By 2014 commercial ADCs are expected to operate at ~64GBaud

How 1Tb/s Might Look… Conventional WDM vs FlexChannels

Guard bands to allow for individual wavelength demux

Fewer guard-bands

25% increase in useable amplifier spectrum

Conventional Per-Channel WDM Filtering

1Tb/s

Multi-Carrier FlexChannel

1Tb/s


Reach, Spectral Efficiency, and Co-Existence

1Tb/s PM-8QAM FlexChannel

1Tb/s PM-16QAM FlexChannel

10x100G PM-QPSK 1Tb/s PM-QPSK

FlexChannel

or

A E

B C

D


Fiber Capacity

Advanced Modulation

Coherent Detection

Advanced FEC

Foundation Features

Large Scale PICs 1

Programmable Modulation 2

Switched DWDM Everywhere 3

Differentiators For Service

Providers

Summary: Proposing a best practice for 100G


next gen optical transport: from 100 gb/s to 1 tb/s and beyond

Technology