flexible optical transmission
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CPqD Proprietary & Confidential – All rights reserved
V International Workshop on Trends in Optical Technologies
18/05/2015
Flexible Optical Transmission
Jacklyn D. Reis, PhD CPqD, Division of Optical Technologies, Campinas – SP, Brazil
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Team
- Optical Transmission -
Andrea Chiuchiarelli
Sandro Marcelo Rossi
Gabriel Suzigan
Daniel Moutinho Pataca
- Optical Subsystems -
João Januário
Heitor Carvalho
Fábio Donati Simões
- Digital Signal Processing -
Eduardo de Souza Rosa
Stenio Magalhães Ranzini
Valery Nobl Rozental
Victor Emanuel Saraiva Parahyba
Glauco César C. Pereira Simões
- Channel Coding -
André Nunes
Alexandre Felipe
José Hélio Jr.
Supporters and Partners
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Division of Optical Technologies at CPqD
Optical Technologies
Transmission
and Networks
Product
Technologies Microelectronics
Integrated
Photonics
Transmission
DSP
DCI
Amplification
ROADM
Networks
Hardware
Software
Firmware
Tests
Mechanics
Requirements
Front End
Back End
Design
Alignment
Packaging
Systems
S
Y
S
T
E
M
S
D
E
V
I
C
E
S Transport
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Optical Systems
Access Next 5 years 1 Gb/s per user at ~60 km Interconnection (DCI) Next 2 years 100 Gb/s per lane, up to 80 km Next 5 years 400 Gb/s multi-lane, ~80 km Metropolitan Next 5 years Flexible 100/200/250/400/500 Gb/s WDM (50/100 GHz / Flexi 75 GHz*), ~600 km Long-Haul: Next 5 years Flexible 100/200/250/400/500 Gb/s WDM (100 GHz / Flexi 75 GHz*), ~2000 km
OIF
IEEE
OIF/ITU
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Optical Subsystems
Optical Amplification (EDFA, Raman, Hybrid) Optical Routing (ROADM)
Monitoring/Control (OTDR, Power)
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Line Interfaces
Data Transmission
Digital Signal Processing (DSP)
Channel Coding (FEC)
Photonic Devices / ASIC Design
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Outline
• Long-Haul
• 100G/200G TOSA
• 400G Flex
• Metro
• 400G unrepeated
• DCI
• 100G-PAM4
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Long-Haul
100G/200G Integrated Devices for Coherent Modules (ACO/DCO)
J.D. Reis, A. Chiuchiarelli, S. Rossi, G.J. Suzigan, S.M. Ranzini, V.N. Rozental, E.S. Rosa, V.R. Cruz, L.H. Carvalho (BrP), J.C. Oliveira (BrP),
and J. Oliveira “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
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Line Interfaces: Coherent System application: Metro/LH/DCI
• Performance↑↑↑, Volume↑↑, Power↓↓, Price↓
CFP CFP2 CFP4 CFP8
• Digital coherent modules to analog coherent modules
Faceplate density maximized when high power electronics are removed from optical modules
• OIF-CFP2-ACO-01.0
• New projects motivated by the OIF-Tech-Options-400G-01.0
• Flex Coherent DWDM Transmission (100/200/400G/λ), High-bandwidth PMQ/ICR (400G/λ), CFP8-ACO (new, 400G/λ)
• Integrated photonic devices are key to minimize the module size and power consumption
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Experimental Setup
Transmitter
• 28-nm ASIC (CL20010) for 32 GBd QPSK/16QAM (100G/200G) (SD-FEC: BER=2.4x10-2)
• Test channel at 193.4 THz
• TOSA (~23 GHz) by BrPHOTONICS or a LiNbO3 DP-IQM (~30 GHz)
• Nyquist WDM (0.1 roll-off): 20x 32 GBd spaced by 37.5 GHz (Tunable ECL~100 kHz)
• Spectral Efficiency: 2.66 (100G) and 5.33 (200G) bit/s/Hz
J.D. Reis et al, “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
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Experimental Setup
Channel
• Recirculating loop with 5x50-km fiber (Corning Vascade EX2000: 112 μm2, 0.16 dB/km, 20 ps/nm/km)
• EDFA (6dB-noise figure) only
Receiver
• Intradyne Coherent Receiver: 40-GHz BPD + 80-GSa/s@35 GHz
• Off-line DSP: resampling, CD comp., DD-LMS, clock/timing recovery, carrier estimation, error counting
J.D. Reis et al, “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
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Experimental Results
Back-to-back: 100G
• No observable penalty
between TOSA and
LiNbO3 in 100G-QPSK
• 1 dB penalty between
single channel to WDM
J.D. Reis et al, “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
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Experimental Results
Back-to-Back: 200G
• ~1 dB penalty between the TOSA and LiNbO3
• SD-FEC
• TOSA: OSNR~19.5 dB
• LiNbO3: OSNR~18.5 dB
• BER floor in WDM
• TOSA: ~6x10-4
• LiNbO3: ~2x10-4
• Carrier board
• EO~11 GHz
J.D. Reis et al, “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
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Experimental Results
Transmission results at the optimal launch power
• TFPS-based ≈ LiNbO3
• Single-channel: ~7500 km
• Nyquist WDM: ~7000 km
J.D. Reis et al, “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
CPqD Proprietary & Confidential – All rights reserved
Experimental Results
Transmission results at the optimal launch
power
• LiNbO3-based: ~1900 km
• TPFS-based TOSA: ~1600 km
J.D. Reis et al, “System Validation of Polymer-based Transmitter Optical Sub-Assembly for 100G/200G Modules,”. OFC 2016
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Long-Haul 400G 400G Single-Carrier using Spectrally-Sliced Receiver
S. Rossi, A. Souza, A. Chiuchiarelli, V. N. Rozental, E.S. Rosa, T. Lima, T. Piven, R. Vincentini (Keysight), J. Oliveira, and J.D. Reis,“20 x 448
Gb/s 56-GBd PM-16QAM Transmission with Wideband and Spectrally-Sliced Receivers,” OFC 2016
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• Several receiver optical front-ends with narrower bandwidth balanced detectors and TIAs
• Several ADCs with slower sampling rate, lower bandwidth, but enhanced ENOB; • N. K. Fontaine, et al. , Nature Photon., Vol. 4, No. 4, pp.248-254, 2010.
• Efficient DSPs based on MIMO processing for signal merging and polarization demultiplexing
• J. Diniz et al., “Digital Signal Processing for Spectrally-Sliced Coherent Optical Receivers” Proc. ECOC, Paper P3.18, 2015.
Spectrally-Sliced Receiver
PolMux
90°
Hybrid
PolMux
90°
Hybrid
PolMux
90°
Hybrid
AWG
Optical
Comb
Generator
Signal
f-Δf f f+Δf
f
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
D
S
P
AWG
CD
Comp.
CD
Comp.
CD
Comp.
CD
Comp.
CD
Estim.
Delay
Delay
Upsam-
pling
Anti-
Aliasing
Anti-
Aliasing
Anti-
Aliasing
Anti-
Aliasing
Upsam-
pling
Upsam-
pling
Upsam-
pling
Freq.
Shift
Freq.
Shift
Freq.
Shift
Freq.
Shift
Carrier
Recov.
Carrier
Recov.
Clock
Rec.
Clock
Rec.
HY1X
HX2X
HY2X
HX1Y
HX1X
HY1Y
HX2Y
HY2Y
Σ
Σ
Optical
Front-
End +
ADC
Optical
Front-
End +
ADC
f-Δf/2
Output
Pol. X
Output
Pol. Y
f
f
f+Δf/2
0
0 0
0 0
0 -Δf/2
Δf/2
4×2 Complex
MIMO Equalizer
0
10-1
10-2
10-3
10-4
10-5
12 14 16 18 20 22 24
TheoreticalExperimental B2B
FEC limit, BER = 2×10-2
FEC limit, BER = 4.5×10-3
2.5 dB
2.2 dB
≈17.5 dB
OSNR @ 0.1nm res. (dB)
BE
R
Back-to-Back BER versus OSNR
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Experimental Setup
Transmitter
• 20x 100-kHz C-band tunable
spaced by 75 GHz
• Keysight M8195A
• 64 GSa/s with 20 GHz (8-bit
resolution)
• 0.1-roll-off RC at 56 GBd
• 1.14 Sample per symbol
• 56-GBd Nyquist DP-16QAM
• 448 Gb/s per λ
• Fiber Transmission
• 5x 50 km recirculating loop
• Corning Vascade EX2000
• 112 μm2, 0.16 dB/km, 20.5 ps/nm/km
• EDFA only
• 6-dB NF
• Receiver
• Wideband Rx
• 100-kHz ECL Local
Oscillator
• 40 GHz BPD + 80-
GSa/s@35GHz scopes
• Spectrally-sliced Rx
• 14-GHz Clock + MZM +POF
Local Oscillator
• 2x 20-GHz ICRs + 2x 40-
GSa/s@16GHz scopes
S. Rossi et al “20 x 448 Gb/s 56-GBd PM-16QAM Transmission with Wideband and Spectrally-Sliced Receivers,” OFC 2016
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4x2 MIMO Equalization
Efficient DSP for Spectrally-Sliced Receiver: 40+40 GSa/s
• CD Estimation and Compensation
• Resampling from 40 GSa/s to 112 GSa/s (2 SpS)
• Low-pass filtering at Rs/2
• Frequency offset correction + time delays for CD slope
• Complex 4x2 MIMO (40 taps)
• Carrier recovery (frequency/phase)
• 4x2 Post MIMO at symbol rate (25 taps)
S. Rossi et al “20 x 448 Gb/s 56-GBd PM-16QAM Transmission with Wideband and Spectrally-Sliced Receivers,” OFC 2016
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Experimental Results
HD-FEC Q2≈8.7 dB
SD-FEC Q2≈5.9 dB
• Wideband
• 3 dB penalty
• Spectrally-sliced
• 4 dB penalty
No penalty between
single channel and
flexible 75 GHz
WDM
OSNR (dB)20 25 30 35 40
Q2 F
acto
r (d
B)
3
4
5
6
7
8
9
10
Theoretical
Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 3.8x10-3
BER = 2.4x10-2
OSNR (dB)20 25 30 35 40
Q2 F
acto
r (d
B)
3
4
5
6
7
8
9
10
Theoretical
Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 3.8x10-3
BER = 2.4x10-2
OSNR (dB)20 25 30 35 40
Q2 F
acto
r (d
B)
3
4
5
6
7
8
9
10
Theoretical
Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 3.8x10-3
BER = 2.4x10-2
S. Rossi et al “20 x 448 Gb/s 56-GBd PM-16QAM Transmission with Wideband and Spectrally-Sliced Receivers,” OFC 2016
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Experimental Results
Q2 versus Distance
Optimal launch power
• 1 dBm in single channel
• Spectrally-sliced
• ~1850 km
• Wideband
• ~2150 km
• 0 dBm in WDM
• Spectrally-sliced
• ~1600 km
• Wideband
• ~1800 km
Transmission Distance (km)500 1000 1500 2000 2500 3000
Q2 F
acto
r (d
B)
4.5
5
5.5
6
6.5
7
7.5
8 Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 2.4x10-2
Transmission Distance (km)500 1000 1500 2000 2500 3000
Q2 F
acto
r (d
B)
4.5
5
5.5
6
6.5
7
7.5
8 Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 2.4x10-2
Transmission Distance (km)500 1000 1500 2000 2500 3000
Q2 F
acto
r (d
B)
4.5
5
5.5
6
6.5
7
7.5
8 Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 2.4x10-2
Transmission Distance (km)500 1000 1500 2000 2500 3000
Q2 F
acto
r (d
B)
4.5
5
5.5
6
6.5
7
7.5
8 Spectrally-Sliced Single Channel
Spectrally-Sliced WDM
Wideband Single Channel
Wideband WDM
BER = 2.4x10-2
S. Rossi et al “20 x 448 Gb/s 56-GBd PM-16QAM Transmission with Wideband and Spectrally-Sliced Receivers,” OFC 2016
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• Efficient DSPs based on MIMO processing for signal merging and polarization demultiplexing ECOC 2015
• 20 x 448 Gb/s 56-GBd PM-16QAM Transmission with Wideband and Spectrally-Sliced Receivers OFC 2016
• Time Recovery and NL compensation schemes when using MIMO? ECOC 2016 • Time Recovery for Spectrally-Sliced Optical Receivers
• Digital Nonlinear Compensation for Spectrally-Sliced Optical Receivers with MIMO Signal Reconstruction
Spectrally-Sliced Receiver
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Unrepeated 400G 40x100G-PAM4 at 140 km
J.C.S.S. Januário, S.M. Rossi, S.M. Ranzini, V.E. Parahyba, V.N. Rozental, A.L.N. Souza, A.C. Bordonalli, J.R.F. Oliveira, J.D. Reis, “Unrepeatered
Transmission of 10400G over 370 km via Amplification Map Optimization”, PTL 2016.
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Experimental Setup
• 10x 400G (2x200G-16QAM) at 75 GHz over 370 km • Tx 32 GBd – 16QAM per lambda
• Rx 2x32 GBd – 16QAM super receiver
• Amplification optimized maps • EDFA / Raman / ROPA
• Transmission link • Corning Vascade EX2000/EX3000
• 110/140 um2, ~0.169 dB/km, ~21 ps/nm/km
• Corning SMF28-LL • 80 um2, ~0.188 dB/km, ~17 ps/nm/km
J.C.S.S. Januário et al “Unrepeatered Transmission of 10400G over 370 km via Amplification Map Optimization”, PTL 2016.
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Data Center
Interconnect 40x100G-PAM4 at 140 km
A. Chiuchiarelli, S.M. Rossi, V.N. Rozental, G.C.C.P. Simões, L.H.H. Carvalho, J.C.R.F. Oliveira, J.R.F. Oliveira, J.D. Reis, “50-GHz+ Thin-Film Polymer on
Silicon Modulator for PAM4 100G-per-wavelength Long-Reach Data Center Interconnects,” sub. ECOC 2016.
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Line Interfaces: IMDD
System application: Metro/DCI
• Performance↑, Volume↑↑↑, Power↓↓↓, Price↓↓↓
• CFPx CWDM4 QSFP28
• Servers TOR/LEAF
• 10G25G50G100G, 1 m – 20 m
• TOR/LEAF Spine
• 40G100G200G/400G, 10 m – 2 km
• Spine Core
• 40G100G200G/400G, 2 km – metro distances
Servers
TOR/LEAF
Spine
Core
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Experimental Setup
• 56-GBd PAM4 using Thin-Film Polymer on Silicon (by
BrP) with 50-GHz+ EO bandwidth
• WDM with 40 channels at 100 GHz
• Unrepeated transmission over 140 km with DCF
56 Gb/s
PPG
14 GHz
PRBS6 dB
64 GSa/s
DAC
MZM
LiNbO3
MZM
1544.92 nm
Thin-Film
Polymer on Si
Delay
RF
PRBS
RF
Driver
λ1
λ2
λ39
10
0 G
Hz
160 GSa/s
Scope
Off-line
DSP
DCF
SS
MF
70-GHz
Photodiode65 GHz
VOA
40-GHz
RF Combiner
Drivers
56-GBd PAM
Transmitter
WDM 40×112 Gb/s
56-GBd PAM
Receiver
TD
CM
10
0 G
Hz
70%30%
Frequency [GHz]10 20 30 40 50 60
|S2
1|2
[dB
]
-15
-12
-9
-6
-3
0
TFPS
LiNbO3
X: 50.47
Y: -3.03
X: 28.66
Y: -3.058
TFPS-MZM
Diagram
Package
Die
A. Chiuchiarelli et al “50-GHz+ Thin-Film Polymer on Silicon Modulator for PAM4 100G-per-wavelength Long-Reach Data Center Interconnects” sub. ECOC
2016.
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Final Remarks
• Digital Signal Processing
• Multiplexing Techniques
• Optical Transmission Technologies
• What is next?
• More Capacity?
• More Flexibility?
• Magical devices
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