real-time 200gbit/s pam4 transmission over 80km ssmf using quantum-dot laser and silicon...

Real-Time 200Gbit/s (4x56.25Gbit/s) PAM4 Transmission Over 80km SSMF Using Quantum-

Dot Laser and Silicon Ring-Modulator

Nicklas Eiselt1,2, Helmut Griesser2, Michael Eiselt2, Wilfried Kaiser3, Saeid Aramideh3,

Juan José Vegas Olmos1, Idelfonso Tafur Monroy1 and Jörg-Peter Elbers2

1) Technical University of Denmark (DTU)

2) ADVA Optical Networking SE

3) Ranovus

© 2017 ADVA Optical Networking. All rights reserved. 2

Data Center Interconnections

Optical Modules

Active Optical Cables

Direct AttachCopper Cabling

≤ 3m

≤ 20m

≤ 500m

≤ 1km

≤10km – 80km (Metro Connectivity)>100km (Long-Haul Connectivity)

DWDM

IEEE802.3bs 400GbitE

Standardizationof PAM4 forShort Reach

B. Booth, et al., “Global Networking Services Objectives to Support Design,” in IEEE 802.3 Study Group, November, 2013. [Online]: http://www.ieee802.org/3/bs/


Inter-Data Center Interconnect

Leverage of IEEE 400GbitE eco-system:

IM/DD PAM4 solution in combination with DWDM transceivers

Data Center Data Center

DCF

• Tbit/s link capacity

• Point-to-point DWDM

• C-band and EDFA amplification

• Optical dispersion compensation allowed

80km SSMF


Inter-Data Center Interconnect - DWDM

DCFOpt. Transmitter

Tx

PAM

4

Opt. Transmitter

Client

Inte

rface Opt.

ReceiverRx P

AM

4

Opt. Receiver

Clie

nt In

terfa

ce

λClient Side Line Side Line Side Client Side

(8x56G) (8x56G)

• Eight channels with 56Gbit/s in 50GHz grid to form a 400G channel

400G 400G

8 8


Inter-Data Center Interconnect - DWDM

Opt. Receiver

Rx P

AM

-4Opt. Receiver

λClient Side Line Side Line Side Client Side

Opt. Transmitter

Tx

PAM

-4

Opt. Transmitter

(8x56G) (8x56G)

• Eight channels with 56Gbit/s in 50GHz grid to form a 400G channel

• Transmission over the whole C-band:

• Up to 4.8Tbit/s capacity when using 12 x 400G transponders/muxponders

Opt. Transmitter

Tx

PAM

-4

Opt. Transmitter

(8x56G)

Opt. Transmitter

Tx

PAM

-4

Opt. Transmitter

(8x56G)

Opt. Transmitter

Tx

PAM

-4

Opt. Transmitter

(8x56G)

Opt. Transmitter

Tx

PAM

4

Opt. Transmitter

Client

Inte

rface

(8x56G) Opt. Receiver

Rx P

AM

-4Opt. Receiver

Opt. Receiver

Rx P

AM

-4Opt. Receiver

Opt. Receiver

Rx P

AM

-4Opt. Receiver

Opt. Receiver

Rx P

AM

4

Opt. Receiver

Clie

nt In

terfa

ce

12 x 400G 12 x 400G

DCF

8 8

8 8(8x56G)


Outline

• TOSA characteristic

• Quantum-dot laser

• Ring modulator

• Experimental setup

• Experimental results

• Optical b2b

• Dispersion tolerance

• DWDM transmission over 80km SSMF

• Conclusion


Quantum Dot Laser (QDL)

• QDL is built on standard InP-process with quantum wells replaced by quantum dots

• Capable of generating multiple wavelength simultaneously with a single device

• Relative intensity noise (RIN) levels of -135dB/Hz per Fabry-Pérot mode

Quantum Dot Laser Structure

Quantum Dot Layer

QDL Spectrum

50GHz


Ring Modulator - Principle

Non-Resonant Resonant

Transfer Function

• Ring resonator acts like a wavelength-sensitive modulator

• Possibility to perform multiplexing, demultiplexing and modulation

• Modulation: ring spectrum is shifted back and forth (red/blue shift)

• Moving resonance profile results in a fast phase shift of optical carrier Chirp!

Vmod Vmod


Silicon Photonic Ring Modulator

Heater

Vmod

Light in Light out

20 µm

• Micro ring resonator is based on a silicon-on-insulator platform

• Heater controls/tunes the resonance frequency of the ring

• Structure sizes: 20µm diameter

• Switching energy of 140fJ/bit

Sip+ n+


Integrated:• Wavelength locker • Bias control for each modulator

PAM4 and TOSA (200Gbit/s)

QDL

Driv

er IC

TOSAClock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

4

DSP

MUX50GHz Grid

PAM4 PHYBCM825504 x 56.25Gbit/s


PAM4 and TOSA (200Gbit/s)

QDL

Driv

er IC

TOSAClock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

4

DSP

56.25Gbit/s PAM4

Extinction > 10dB

MUX50GHz Grid



Clock Multiplier

CD

Rs/

Mux

AD

C

FEC

-1

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

AD

C

FEC

-1

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

AD

C

FEC

-1

PAM

-4

DSP

PAM4 and TOSA/ROSA (200Gbit/s)

QDL

Driv

er IC

TOSA


Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

-4

DSP

Clock Multiplier

CD

Rs/

Mux

FEC

DAC

PAM

4

DSP Q

TIA Clock Multiplier

CD

Rs/

Mux

AD

C

FEC

-1

PAM

4

DSP


FFE-DFE Equalizer

With 24 FFE Taps

ROSAMUX50GHz Grid

DMUX50GHz Grid

400G (8 x 56Gbit/s PAM4) obtained by using two TOSAs and ROSAs


• Parameters:

• Data rate: 56.25Gbit/s/λ PAM4 (200 Gbit/s DWDM)

• PRBS of length 231-1

• Frequencies: 191.45 - 191.6THz

Experimental Setup – 80km SSMF

SSMF

80kmVOA

DCF

EDFA

OSA

TOSA

Tx

PICQDL

QDRV

PAM4

PHY

PAM4

PHY

ROSA

PIN

QTIA

VOA

PAM4

PHY

PAM4

PHY

4x56.25Gbit/s4x56.25Gbit/s

EDFA

MUX 50GHz Grid

DMUX 50GHz Grid


MUX Loss-5dB

-7.5dBmper Channel

Link loss-18dB

+ 4dBmFiber Launch Power

DCF Loss-5dB

Input Power DCF: - 3dBm

DMUX Loss-5dB

-1dBm per Channel

Experimental Setup – 80km SSMF

SSMF

80kmVOA

DCF

EDFA

OSA

TOSA

Tx

PICQDL

QDRV

PAM4

PHY

PAM4

PHY

ROSA

PIN

QTIA

VOA

PAM4

PHY

PAM4

PHY

4x56.25Gbit/s4x56.25Gbit/s

EDFA

MUX 50GHz Grid

DMUX 50GHz Grid

Available OSNR ≈ 36 dB

Available OSNR ≈ 36dB


Results: OSNR Performance

• Optical back-to-back

• Single channel

• MUX/DEMUX inside

• For all channels:

• <28dB OSNR at FEC-limit

• BERs <1e-5 achieved

• Performance variations due to

different bias conditions

2

3

4

5

6

7

2

22 24 26 28 30 32 34 36

-Lo

g(B

ER)

OSNR [dB]

TOSA CH0

TOSA CH1

TOSA CH2

TOSA CH3FEC-limit: BER=1e-3


Results

• Dispersion tolerance:• -50ps to +150ps result in a 1-dB OSNR penalty

25

26

27

28

29

30

31

32

-200 -100 0 100 200 300

Req

uir

ed O

SNR

@ B

ER=1

e-3

Chromatic Dispersion [ps/nm]

TOSA CH #3TOSA CH #2TOSA CH #1TOSA CH #0

26

27

28

29

30

31

32

-200 -100 0 100 200 300

Req

uir

ed O

SNR

@ B

ER=2

e-4

Chromatic Dispersion [ps/nm]

TOSA CH #3TOSA CH #2TOSA CH #1TOSA CH #0

BER=1e-3 BER=2e-4 (KP4-FEC)

-50ps to 150ps

-50ps to 150ps


Results: DWDM transmission over 80km

30

32

34

36

38

1E-6

1E-5

1E-4

1E-3

1E-2

-5 -3 -1 1 3 5 7 9

OSN

R [

dB

]

BER

Launch Power per Channel [dBm]

4x56Gbit/s DWDM - CH0

56Gbit/s Single Channel - CH0

FEC LimitBER=1e-3

• Successful transmission over

80km

• Optimum launch power:

• Single channel: 3dBm

• DWDM channel: 2.5dBm


Results: DWDM transmission Over 80km

1E-6

1E-5

1E-4

1E-3

1E-2

-5 -3 -1 1 3 5 7 9

BER

Launch Power per Channel [dBm]

4x56Gbit/s DWDM - CH04x56Gbit/s DWDM - CH14x56Gbit/s DWDM - CH24x56Gbit/s DWDM - CH3

FEC LimitBER=1e-3

• Successful transmission over

80km

• Optimum launch power:

• Single channel: 3dBm

• DWDM channel: 2.5dBm

• Similar performance of all

DWDM channels


Long Term Measurement

• DWDM transmission over 80km

SSMF

• Stable performance over more

than 12 hours

1E-6

1E-5

1E-4

0 2 4 6 8 10 12 14

BER

Time [h]

4x56.25 Gbit/s DWDM - CH04x56.25 Gbit/s DWDM - CH1


Conclusion

• Experimental demonstration of real-time 4x56.25Gbit/s

PAM4 over up to 80km SSMF

• Use of quantum-dot laser and silicon ring modulators

• Optical b2b performance: <28dB OSNR at FEC-limit

• BERs well below 1E-4 after 80km SSMF transmission

• Ensures error free operation with HD-FEC of 1e-3

• Sufficient system margin

• Stability of system confirmed in long-term measurement

PAM4 PHY

PAM4 PHY

TOSA/ROSA

IMPORTANT NOTICE

The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited.

The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation.

Copyright © for the entire content of this presentation: ADVA Optical Networking.

Thank You

IMPORTANT NOTICE

The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited.

The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation.

Copyright © for the entire content of this presentation: ADVA Optical Networking.

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real-time 200gbit/s pam4 transmission over 80km ssmf using quantum-dot laser and silicon...

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