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Coherent or direct detect for the data center interconnect?

This presentation from OFC general co-chair Jörg-Peter Elbers examined the latest optical transmission technologies for the data center interconnect, comparing direct detection solutions to coherent transmission.

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Coherent or direct detect for the data center interconnect?

  1. 1. Jörg-Peter Elbers OFC panel: Line side 100Gbit/s DWDM network solutions – debating the options for the data center interconnect? Coherent or direct detect
  2. 2. © 2019 ADVA. All rights reserved.22 Data centers require high-capacity interconnects DC spine switch DWDM transponder DC edge router Core OLS Customer traffic DCI OLS It's good to have a choice – open line system and best-of-breed terminal optics Ring or mesh 100s-1000s of km Fiber scarce Point-to-point <80km distance Can be fiber rich Core connectivity DCI connectivity
  3. 3. © 2019 ADVA. All rights reserved.33 • High performance and spectral efficiency • On-board and CFP(2) form factors • 100Gbit/s to 600Gbit/s available today • DSP-based dispersion compensation • “Good enough” for P2P DCI applications • The only solution in QSFP28 form factor • 100Gbit/s available today • Needs optical dispersion compensation Direct detectCoherent How should dispersion be managed for direct detect? DWDM line-side options for DCI applications DWDM QSFP28CFP2-DCO DWDM terminal with on-board optics
  4. 4. © 2019 ADVA. All rights reserved.44 Smart amplifier offers coherent-like automation for direct detect optics Operational simplicity for direct detect • Automatic dispersion measurement • Automatic dispersion compensation • Automatic gain, tilt, and power setting • Optional integrated OTDR • Optional optical channel monitor Smart features + = Configuration provisioning Monitoring alarms TACACS+ Radius CLI REST NETCONF WebGUI Zero touch prov SNMPv2c REST NETCONF Streaming telemetry FCAPS Control REST
  5. 5. © 2019 ADVA. All rights reserved.55 Highest capacity, functionality and flexibility with DWDM terminal – Lowest rack space with DWDM QSFP28 in switch/router Which line side option to pick? It depends … 38.4 19.2 9.6 4.8 0 10 20 30 40 50 600G Coh. 200G Coh. 100G Coh. 100G PAM4 C-bandcapacity(Tbit/s) Modulation format CFP2-DCO DWDM QSFP28 DWDM terminal with on-board optics
  6. 6. © 2019 ADVA. All rights reserved.66 The good news? An open DCI line system supports all! Open APIs Pre-amp Pre-ampBooster Booster WDM filter Open APIs WDM filter Switch/router with PAM4 QSFP28 Coherent interfaces Switch/router with PAM4 QSFP28 Coherent interfaces Disaggregated terminal equipment Disaggregated terminal equipment
  7. 7. 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. jelbers@advaoptical.com

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