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Towards Terabit Optical Networks Júlio César R.F. de Oliveira, Ph.D Optical Systems Manager, CPqD

Towards Terabit per Second Optical Networking

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Júlio Oliveira - CPqD

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Page 1: Towards Terabit per Second Optical Networking

Towards Terabit Optical Networks

Júlio César R.F. de Oliveira, Ph.D

Optical Systems Manager, CPqD

Page 2: Towards Terabit per Second Optical Networking

Summary

Optical Transmission – 100G, 400G, ..... , NxTb/s

Optical Networking – Amps., ROADMs, Controlability

Microelectronics for Coherent Transmission (ASIC DSP/OTN)

Integrated Photonics (Modulators, Receivers, Monitors,...)

Conclusions

Page 3: Towards Terabit per Second Optical Networking

28-Gbaud

QPSK

Modulation

Format

Number

Subcarriers

Baud Rate

(Gbaud)

2 4 16

14

28

32

1

2

8

10

28-Gbaud

16QAM

100G

28-Gbaud

16QAM

200G 400G

28-Gbaud

16QAM 28-Gbaud

QPSK

1T

112 Gb/s

QP

SK

16

QA

M

448 Gb/s

16

QA

M

224 Gb/s

16

QA

M

1.12 Tb/s

Toward Terabit Systems

QP

SK

QP

SK

1.12 Tb/s

Page 4: Towards Terabit per Second Optical Networking

448-Gb/s dual-carrier PDM-16QAM

25GHz

56GHz

112GHz

56GHz

35GHz

25GHz Pre-filtering

35GHz spacing

between the two

carriers

75GHz

Two 50% RZ carriers

Occuping a

112 GHz grid

Two 50% RZ carriers

occuping a 75GHz grid

112GHz

Higher performance, spectral efficiency

and filtering robustness

Page 5: Towards Terabit per Second Optical Networking

448-Gb/s dual-carrier PDM-16QAM

Higher performance, spectral efficiency

and filtering robustness

Mux

PRBS

PDM-QPSK Modulator

EDFA 3 dB PBC

PDM Emulator

Pulse

Carver

5x1

Odd

50

km

50

km

50

km

50

km

EDFA EDFA EDFA EDFA

EDFAEDFA

26

km

SW 13 dB

SW 2

Pol.

Div.

Hyb.

90°

Ort

ho

no

rma

liza

tio

n

De

ske

w

Po

lariza

tio

n D

em

ux

Ca

rrie

r R

eco

ve

ry

De

mo

du

latio

n

Offline DSP

WSS

(e)

LO

Clo

ck R

eco

ve

ry

SC

OP

E (

40

-GS

/s)

3 dB

Mux

PRBS

PDM-QPSK Modulator

EDFA 3 dB PBC

PDM Emulator

Pulse

Carver

5x1

Even

Wa

ve

Sh

ap

er

CD

Co

mp

en

sa

tio

n

RZ-PDM-16QAM Eye

RZ-16QAM Eye

(b)

Pol. Incidence

angle of 26.5°

(a)

(c) (d)Modulation Format DP-16QAM

Carriers 2

Baud rate 28 G

SE 5.6 b/s/Hz

Grid 75 GHz

Reach 678 km

Page 6: Towards Terabit per Second Optical Networking

Optical Superchannel: 1.12-Tb/s

1000 km of

optical fiber!

Features

Baud rate 28 Gb/s

Modulation RZ-PDM-16QAM

Total bit rate 1 Tb/s

Bit rate per carrier 224 Gb/s

Carrier spacing 35 GHz

Spectral Efficiency

6 b/s/Hz

Spectral Occupancy 175 GHz

Reach 1000 km

Feasible application Metropolitan Networks

Page 7: Towards Terabit per Second Optical Networking

Modulation

Format

Number

Subcarriers

Baud Rate

(Gbaud)

2 4 16

14

28

32

1

2

8

10

100G

28-Gbaud

16QAM

200G 400G

28-Gbaud

16QAM

1T

OFDM has been also investigated…

12.5-Gbaud

QPSK

12.5-Gbaud

16QAM

Tx

Rx

Comb

Gen.

Key-module: Comb Generator

Stable

Equilized-Power

Broadband

Page 8: Towards Terabit per Second Optical Networking

450 Gb/s CO-OFDM DP-QPSK (9 carriers)

Comb-generator

After 226km After 2260km After 3840 km

Modulation Format DP-QPSK

Carriers 9

Baud rate 12.5 G

SE ~4 b/s/Hz

Grid 112.5 GHz

Reach 3840 km

Page 9: Towards Terabit per Second Optical Networking

400-Gb/s CO-OFDM DP-16QAM (4 carriers)

Feedback – comb generator

Features

Baud rate 12.5 GBd

Modulation PDM-16QAM

Total bit rate 400-Gb/s

Bit rate per carrier 100-Gb/s

Carrier spacing 12.5-GHz

Spectral Efficiency

6.4 b/s/Hz

Spectral Occupancy 62.5-GHz

Reach 450 km

Feasible application Metropolitan Networks

Page 10: Towards Terabit per Second Optical Networking

Flexible-Transmitter for Terabit applications

3 Carriers Test Features

Feasible

application

Metropolitan

Networks

Long-Haul

Networks

Modulation RZ-PDM-16QAM RZ-PDM-QPSK

Baud rate 28 Gb/s 28 Gb/s

Bit rate per

carrier 224 Gb/s 112 Gb/s

Total bit rate 672 Gb/s 336 Gb/s

Carrier spacing 33.6 GHz 30.8 GHz

Spectral

Efficiency 6.25 b/s/Hz 3.41

Spectral

Occupancy 100.8 GHz 92.4 GHz

Reach 900 km 4900 km

3 Carriers

Transmission

Evaluation

-Quasi-Nyquist spacing

- Upgradable transmitter;

- DSP-Tx free;

- Reach adaptable

Page 11: Towards Terabit per Second Optical Networking

Field Trials: Terabit systems

Giga Network Setup

Page 12: Towards Terabit per Second Optical Networking

Terabits CO-OFDM DP-QPSK 12.5 GBaud RF

Sinusoidal

33 dBm

AM PM PM

Phase

shiftPhase

shift

Phase

shift

17 dBm

Pol.

rotator

12 dBm

27 dBm 27 dBm

15 dBm 2 dBm

Flexigrid WSS

12.5 GHz

AM: Amplitude Modulator

PM: Phase Modulator

23 CO-OFDM

Carriers

1551 nm

PM EDFA

23 dBm18 dBm

Pol.

rotator

CW

Laser

RF

Sinusoidal

33 dBm

AM PM PM

Phase

shiftPhase

shift

Phase

shift

17 dBm

Pol.

rotato

r

12 dBm

27 dBm 27 dBm

15 dBm

12.5 GHz

AM: Amplitude Modulator

PM: Phase Modulator

1551 nm

PM EDFA

23 dBm18 dBm

CW

LaserPol.

rotator

3 dB3 dB

Flexigrid WSS

Flexigrid WSS

Pol.

rotatorPol.

rotator

Modulation Format DP-QPSK

Subcarriers 23

Baud rate 12.5 G

SE 3.5 b/s/Hz

Grid 300 GHz

Reach 4520 km

Modulation Format DP-QPSK

Subcarriers 45

Baud rate 12.5 G

SE 3.65 b/s/Hz

Bandwidth 575 GHz

Reach 338 km (GIGA)

Page 13: Towards Terabit per Second Optical Networking

High Speed DAC 34GS/s High Speed DAC 65GS/s

Digital (Pre)Filtering

Page 14: Towards Terabit per Second Optical Networking

34GS/s DAC (N-QAM) - 2012

16-QAM

256-QAM 64-QAM

QPSK

Page 15: Towards Terabit per Second Optical Networking

65GS/s DAC (N-QAM) - 2013

QPSK 16QAM 32QAM 64QAM

Page 16: Towards Terabit per Second Optical Networking

65GS/s Nyquist Filtering Results (Preliminar)

Page 17: Towards Terabit per Second Optical Networking

CPqD Coherent Transmission Evolution

100 Gb/s 200 Gb/s 400 Gb/s 1 Tb/s ... 2 Tb/s

Page 18: Towards Terabit per Second Optical Networking

Transmission Results summary (CPqD)

Bit rate [Gb/s] Modulation Carriers Baud rate [GBd] SE [b/s/Hz] Reach [km] Capacity [Tb/s]

112 PDM-QPSK 1 28 2.1 3200 Long-H

224 PDM-16QAM 1 28 4.2 680 Metro/Long-H

400 PDM-16QAM 4 12.5 6.4 450 Metro/Long-H

448 PDM-16QAM 2 28 5.6 680 Metro/Long-H

450 PDM-QPSK 9 12.5 3.36 3840 Long-H

1120 PDM-16QAM 5 28 6 1000 Long-H

1120 PDM-QPSK 10 28 3.41 450 Metro/Long-H

1150 PDM-QPSK 23 12.5 3.5 4520 Long-H

2250 PDM-QPSK 45 12.5 3.65 338 (GIGA) Metro/Long-H

Page 19: Towards Terabit per Second Optical Networking

100G Coherent Optical Module

Page 20: Towards Terabit per Second Optical Networking

Network Monitoring

Cognitive

Management and Control

Central

Office

Understanding the network

Adding intelligence to the network

Page 21: Towards Terabit per Second Optical Networking

...

HNLF EDFA/Raman AMP

Raman Pump

GMPLS Control Plane

- Network Registration -Topolgy Discovery - Route wavelength Assingment (RWA);

Tx/Rx

Degree 1

Degree 2

Degree 3 Degree n

RO

AD

M

Tx/Rx

RO

AD

M

Read Monitoring

Cognitive/Smart Processing

Self-Configurable/

Cognitive

WDM Network

Network actuation

TDCM TPMD

- Network Monitoring (OLMP): - Input/Output Power - Channel Power - OSNR - BER (Pre and Post FEC) - Chromatic Dispersion - PMD

Authonomic Networks

Page 22: Towards Terabit per Second Optical Networking

Optical Networking Testbed (Logical Layer)

TODAY

• SDN + GMPLS optical network concept

• Network monitor/process/control algorithms

to enable smart optical network;

• Adaptive and cognitive EDFA;

• Network Discovery and Abstraction;

Further Works

• Adaptive and Cognitive ROADMs

• Optical Network Auto- Alignment

• UNI-C and UNI-N

• Automatic Fault Restoration

• Fault Prediction

• Spectrum defragmentation

• Hitless networks

• Integration with OTN-S

Page 23: Towards Terabit per Second Optical Networking

Optical Networking Testbed (Physical Layer)

Laboratorial Testbed

Testbed Topology

Developed Line Cards

(HW/FW)

Page 24: Towards Terabit per Second Optical Networking

In-Band OSNR Monitor (Pol. Diversity & Interferometric)

Filter

50GHz

PBS DSP

Driver

Tx

EDFA

SMF

TAP Rx

SMF

EDFA

τ

OSNR Monitor

CD = 0 ps/nm & DGD = 0 ps CD = 750 ps/nm & DGD = 45 ps ECOC2013 Submitted

Page 25: Towards Terabit per Second Optical Networking

Adaptive and Cognitive Optical Network Algorithms

Adaptive EDFA (PTL in submission)

• EDFA Noise Figure and Flatness

operation point optimization on-line

Cognitive EDFA without

launch power (LP)

BER ok ?

Cognitive EDFA with

launch power (LP) 1

All BER

ok ? LP2 = LP1++

END

END

-2 dBm (16-QAM)

0 dBm (CO-OFDM)

2 dBm (16-QAM)

4 dBm (CO-OFDM)

Cognitive EDFA (OFC2013)

• Adaptive EDFA + Channels BER history to

adjust best launch power (error free for att. 6 dB)

Fail

OK

Fail

OK

Fail

OK

Fail

OK OK

OK

OK OK

BER

reduction

¹Cog. action transient time

² Attenuation event Occur

With cog.

(new Gains)

Without

cognition

(same gain) ¹

²

Page 26: Towards Terabit per Second Optical Networking

Line card development

Optical Amplifiers

(Optimized)

• EDFA

• Raman Amp.

• Hybrid Amp.

C/L Band

Routing and Monitoring

• PLC and WSS ROADMs;

• Optical Channel Monitoring ;

• CDC Multi-Cast-Switch;

Tech.

Transfer

Page 27: Towards Terabit per Second Optical Networking

2013 - ASIC DSP

Page 28: Towards Terabit per Second Optical Networking

ASIC DSP - (BPSK/QPSK/16-QAM)

Page 29: Towards Terabit per Second Optical Networking

ASICs DSP – Microelectronic Flow

Page 30: Towards Terabit per Second Optical Networking

Logic Synthesis (Test case 1)

Page 31: Towards Terabit per Second Optical Networking

Physical Synthesis results Test case 1 (auto FP&R)

Page 32: Towards Terabit per Second Optical Networking

ASIC OTN 100G

Framer / Deframer

OTU-4

Map

per

s/ D

emap

ers

(SD

H /

FC

/ G

bE

/ OT

N)

Inte

rfac

e 1

Inte

rfac

e 2

Mux / Demux

FEC

EFEC

OTN Processor

Page 33: Towards Terabit per Second Optical Networking

ASIC OTN

OTN – GbE – SDH – FC

OTN

100 Gbit/s

Page 34: Towards Terabit per Second Optical Networking

ASIC OTN

Page 36: Towards Terabit per Second Optical Networking

Integrated Photonics (PSGC – CPqD Design)

Electric Field Amplitude Distribution

60 mm

33 mm

Page 37: Towards Terabit per Second Optical Networking

Integrated Photonics (Packaging)

Page 38: Towards Terabit per Second Optical Networking

CPqD Strategy – Towards Terabit Optical Netwoks

Design and packaging

coherent linecard critical

components

Cognitive Optical Networks

(GMPLS/SDN, Amps,

ROADMs, Monitoring)

100 Gb/s 200 Gb/s

400 Gb/s 1 Tb/s

Coherent transmission

evolution towards NxTb/s

Focus on

INDUSTRY

(Products)

Page 39: Towards Terabit per Second Optical Networking

Conclusions

- Fast evolution on optical transmission due to coherent, 100G is a reality, 400G will be the

next step and 1T technologies are feasible in lab. right now

- Coherent evolution demands new technological domain (DSP, microelectronics, integrated

photonics) and generates high dependence in transmitters critical components (ASICs,

Mod./Rx), that require massive investments, CPqD with governamental and industry support

are developing this systems and components to enable the growth of national WDM systems

-Optical networks evolution trough Hybrid Amplifiers, ROADMs, Control Plane and

Monitoring are under fast development

- The evolution of optical communications are critical to world wide interconnect and plays a

key social role in any country in the world, this field are under continuous evolution with a

fast established cycle between R&D and market, enabling the broadband evolvution in a

sustainable way!!!!!!

Page 40: Towards Terabit per Second Optical Networking

Acknowledgements

Page 41: Towards Terabit per Second Optical Networking

Thank You!

www.cpqd.com.br