real-time 200gbit/s pam4 transmission over 80km ssmf using quantum-dot laser and silicon...
Post on 12-Apr-2017
177 Views
Preview:
TRANSCRIPT
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/
© 2017 ADVA Optical Networking. All rights reserved. 3
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
© 2017 ADVA Optical Networking. All rights reserved. 4
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
© 2017 ADVA Optical Networking. All rights reserved. 5
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)
© 2017 ADVA Optical Networking. All rights reserved. 6
Outline
• TOSA characteristic
• Quantum-dot laser
• Ring modulator
• Experimental setup
• Experimental results
• Optical b2b
• Dispersion tolerance
• DWDM transmission over 80km SSMF
• Conclusion
© 2017 ADVA Optical Networking. All rights reserved. 7
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
© 2017 ADVA Optical Networking. All rights reserved. 8
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
© 2017 ADVA Optical Networking. All rights reserved. 9
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+
© 2017 ADVA Optical Networking. All rights reserved. 10
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
© 2017 ADVA Optical Networking. All rights reserved. 11
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
PAM4 PHYBCM825504 x 56.25Gbit/s
© 2017 ADVA Optical Networking. All rights reserved. 12
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
PAM4 PHYBCM825504 x 56.25Gbit/s
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
PAM4 PHYBCM825504 x 56.25Gbit/s
FFE-DFE Equalizer
With 24 FFE Taps
ROSAMUX50GHz Grid
DMUX50GHz Grid
400G (8 x 56Gbit/s PAM4) obtained by using two TOSAs and ROSAs
© 2017 ADVA Optical Networking. All rights reserved. 13
• 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
© 2017 ADVA Optical Networking. All rights reserved. 14
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
© 2017 ADVA Optical Networking. All rights reserved. 15
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
© 2017 ADVA Optical Networking. All rights reserved. 16
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
© 2017 ADVA Optical Networking. All rights reserved. 17
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
© 2017 ADVA Optical Networking. All rights reserved. 18
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
© 2017 ADVA Optical Networking. All rights reserved. 19
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
© 2017 ADVA Optical Networking. All rights reserved. 20
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.
neiselt@advaoptical.com
ABACUSFENDOI
top related