Real-Time 200Gbit/s PAM4 Transmission Over 80km SSMF Using Quantum-Dot Laser and Silicon Ring-Modulator
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Using 200Gbit/s four-channel transmitter and receiver optical subassemblies (TOSAs/ROSAs) combining quantum dot laser and silicon photonics technology from Ranovus, ADVA Optical Networking demonstrated how to build cost-effective 400Gbit/s transponder cards at OFC 2017.
![© 2017 ADVA Optical Networking. All rights reserved.2
Data Center Interconnections
Optical
Modules
Active Optical
Cables
Direct Attach
Copper Cabling
≤ 3m
≤ 20m
≤ 500m
≤ 1km
≤10km – 80km (Metro Connectivity)
>100km (Long-Haul Connectivity)
DWDM
IEEE802.3bs
400GbitE
Standardization
of PAM4 for
Short 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/](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Real-Time 200Gbit/s PAM4 Transmission Over 80km SSMF Using Quantum-Dot Laser and Silicon Ring-Modulator
- 1. 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
- 2. © 2017 ADVA Optical Networking. All rights reserved.2 Data Center Interconnections Optical Modules Active Optical Cables Direct Attach Copper Cabling ≤ 3m ≤ 20m ≤ 500m ≤ 1km ≤10km – 80km (Metro Connectivity) >100km (Long-Haul Connectivity) DWDM IEEE802.3bs 400GbitE Standardization of PAM4 for Short 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/
- 3. © 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
- 4. © 2017 ADVA Optical Networking. All rights reserved.4 Inter-Data Center Interconnect - DWDM DCFOpt. TransmitterTxPAM4 Opt. Transmitter ClientInterface Opt. Receiver RxPAM4 Opt. Receiver ClientInterface 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
- 5. © 2017 ADVA Optical Networking. All rights reserved.5 Inter-Data Center Interconnect - DWDM Opt. Receiver RxPAM-4 Opt. Receiver λClient Side Line Side Line Side Client Side Opt. TransmitterTxPAM-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. TransmitterTxPAM-4 Opt. Transmitter (8x56G) Opt. TransmitterTxPAM-4 Opt. Transmitter (8x56G) Opt. Transmitter TxPAM-4 Opt. Transmitter (8x56G) Opt. TransmitterTxPAM4 Opt. Transmitter ClientInterface (8x56G) Opt. Receiver RxPAM-4 Opt. Receiver Opt. Receiver RxPAM-4 Opt. Receiver Opt. Receiver RxPAM-4 Opt. Receiver Opt. Receiver RxPAM4 Opt. Receiver ClientInterface 12 x 400G 12 x 400G DCF 8 8 8 8 (8x56G)
- 6. © 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
- 7. © 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
- 8. © 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
- 9. © 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+
- 10. © 2017 ADVA Optical Networking. All rights reserved.10 Integrated: • Wavelength locker • Bias control for each modulator PAM4 and TOSA (200Gbit/s) QDLDriverIC TOSA Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM4 DSP MUX 50GHz Grid PAM4 PHY BCM82550 4 x 56.25Gbit/s
- 11. © 2017 ADVA Optical Networking. All rights reserved.11 PAM4 and TOSA (200Gbit/s) QDLDriverIC TOSA Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM4 DSP 56.25Gbit/s PAM4 Extinction > 10dB MUX 50GHz Grid PAM4 PHY BCM82550 4 x 56.25Gbit/s
- 12. © 2017 ADVA Optical Networking. All rights reserved.12 Clock Multiplier CDRs/ Mux ADC FEC-1 PAM-4 DSP Clock Multiplier CDRs/ Mux ADC FEC-1 PAM-4 DSP Clock Multiplier CDRs/ Mux ADC FEC-1 PAM-4 DSP PAM4 and TOSA/ROSA (200Gbit/s) QDLDriverIC TOSA PAM4 PHY BCM82550 4 x 56.25Gbit/s Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM-4 DSP Clock Multiplier CDRs/ Mux FEC DAC PAM4 DSP QTIA Clock Multiplier CDRs/ Mux ADC FEC-1 PAM4 DSP PAM4 PHY BCM82550 4 x 56.25Gbit/s FFE-DFE Equalizer With 24 FFE Taps ROSAMUX 50GHz Grid DMUX 50GHz Grid 400G (8 x 56Gbit/s PAM4) obtained by using two TOSAs and ROSAs
- 13. © 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 80km VOA DCF EDFA OSA TOSA Tx PIC QDL QDRV PAM4 PHY PAM4 PHY ROSA PIN QTIA VOA PAM4 PHY PAM4 PHY 4x56.25Gbit/s 4x56.25Gbit/s EDFA MUX 50GHz Grid DMUX 50GHz Grid
- 14. © 2017 ADVA Optical Networking. All rights reserved.14 MUX Loss -5dB -7.5dBm per Channel Link loss -18dB + 4dBm Fiber Launch Power DCF Loss -5dB Input Power DCF: - 3dBm DMUX Loss -5dB -1dBm per Channel Experimental Setup – 80km SSMF SSMF 80km VOA DCF EDFA OSA TOSA Tx PIC QDL QDRV PAM4 PHY PAM4 PHY ROSA PIN QTIA VOA PAM4 PHY PAM4 PHY 4x56.25Gbit/s 4x56.25Gbit/s EDFA MUX 50GHz Grid DMUX 50GHz Grid Available OSNR ≈ 36 dB Available OSNR ≈ 36dB
- 15. © 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 -Log(BER) OSNR [dB] TOSA CH0 TOSA CH1 TOSA CH2 TOSA CH3 FEC-limit: BER=1e-3
- 16. © 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 RequiredOSNR@BER=1e-3 Chromatic Dispersion [ps/nm] TOSA CH #3 TOSA CH #2 TOSA CH #1 TOSA CH #0 26 27 28 29 30 31 32 -200 -100 0 100 200 300 RequiredOSNR@BER=2e-4 Chromatic Dispersion [ps/nm] TOSA CH #3 TOSA CH #2 TOSA CH #1 TOSA CH #0 BER=1e-3 BER=2e-4 (KP4-FEC) -50ps to 150ps -50ps to 150ps
- 17. © 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 OSNR[dB] BER Launch Power per Channel [dBm] 4x56Gbit/s DWDM - CH0 56Gbit/s Single Channel - CH0 FEC Limit BER=1e-3 • Successful transmission over 80km • Optimum launch power: • Single channel: 3dBm • DWDM channel: 2.5dBm
- 18. © 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 - CH0 4x56Gbit/s DWDM - CH1 4x56Gbit/s DWDM - CH2 4x56Gbit/s DWDM - CH3 FEC Limit BER=1e-3 • Successful transmission over 80km • Optimum launch power: • Single channel: 3dBm • DWDM channel: 2.5dBm • Similar performance of all DWDM channels
- 19. © 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 - CH0 4x56.25 Gbit/s DWDM - CH1
- 20. © 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
- 21. 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