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Coherent technologies for short reach applications

Jörg-Peter Elbers‘ session at SPPCom 2020 discussed electro-photonic integration and explored what coherent technologies mean for the future of short reach applications.

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Coherent technologies for short reach applications

  1. 1. Jörg-Peter Elbers, ADVA APC - SPPCom 2020 – Symposium on Short Reach Coherent – SpW2I.3 Coherent technologies for short reach applications
  2. 2. © 2020 ADVA. All rights reserved.22 Design choices depend on the application Coherent interface trade-offs Spectral efficiency Performance Flexibility Energy efficiency Cost efficiency Compactness
  3. 3. © 2020 ADVA. All rights reserved.33 Intra-DC/intra-officeMetro/DCI/accessSubsea/LH/core Pluggable modules 400G-ZR (QSFP-DD, 15W) 100…400G-ZR+ (CFP2, 25W) What to watch 100G-ZR (QSFP28, 5W) Transceiver chiplets A future application? Direct-detect modules today What to watch Co-packaged optics (CPO) Integrated interfaces 400G-1.2T channels Ultra-flexible modulation What to watch 140GBd per lambda Coherent applications [imagecredit:CPOCollaboration]
  4. 4. © 2020 ADVA. All rights reserved.44 Current coherent module focus: ZR(+) interfaces (DWDM) The interface alphabet soup
  5. 5. © 2020 ADVA. All rights reserved.55 ZR+ often supports additional features and proprietary FECs ZR(+) interface cheat sheet Standard Data rate Interface Modulation format FEC DWDM Nom. Reach ITU-T G.698.2/G.709.2 OpenROADM CableLabs 100G OTU4-LR DP-DQPSK SC-FEC 100 & 50GHz 96ch. (50GHz) 100GHz 120km, 500km 500km, 1000km 120km IEEE 802.3ct 100G 100GBASE-ZR DP-DQPSK SC-FEC 48ch. (100GHz) 80km ITU-T G.698.2/G.709.3 OpenROADM CableLabs 200/400G 200/300/400G 200G FlexO DP-16QAM DP-QPSK/-8QAM/-16QAM DP-QPSK (DP-16QAM) CFEC, OFEC OFEC OFEC FlexGrid FlexGrid 100GHz (50GHz) 120km, 500km 500km, 1000km 120km IEEE 802.3cw OIF 400G 400G 400GBASE-ZR 400ZR DP-16QAM DP-16QAM CFEC CFEC 64ch. (75GHz) 48/64 ch. (100/75GHz) 80km 120km SC-FEC: Staircase-FEC, CFEC: Concatenated staircase & soft-decision Hamming FEC, OFEC: Open-FEC (spatially correlated product code based soft-decision FEC)
  6. 6. © 2020 ADVA. All rights reserved.66 SFP form factor will make coherent implementations a challenge What about lower-speed pluggables? Residential accessBusiness parks Mobile fronthaul   G.metro Self-tuning SFP [Source: V. Bhatt, II-VI]
  7. 7. © 2020 ADVA. All rights reserved.77 What’s important moving forward? Electro-photonic integration * *external (for IC-TROSA type 1) ** not needed for Silicon Photonics IC-TROSA type 1 SMT package (reflow-soldering capable) TIA: Transimpedance amplifier TEC: Thermoelectric cooler ** IC-TROSA: Integrated coherent transmitter-receiver optical subassembly
  8. 8. © 2020 ADVA. All rights reserved.88 Low power consumption Need to optimize each block for shorter reach applications What’s important moving forward? 1.4, 11% 0.3, 2% 0.5, 4% 2.3, 18% 0.3, 2% 1.8, 14%1, 8% 0.2, 1% 2.2, 17% 0.8, 6% 0.8, 6% 1,4; 11% 400ZR Module Power Estimate in W (13W total) SerDes (incl FEC) Eth Framer 15% SD-FEC Digital Modem Other (DSP) ADC/DAC Drivers Modulator Laser TIA Control DC/DC 7nm DSP (6.6; 51%) Optics (4.2; 32%) Other (2.2; 17%) [based on oif2017.049.01.pdf]
  9. 9. © 2020 ADVA. All rights reserved.99 Conclusions Coherent technologies are conquering new territory Cost, power and footprint are most important parameters in short reach applications Spectral efficiency, ultimate performance and flexibility are less important Near-term opportunities exist in the 100G-400G ZR(+) space The need for higher capacities will open access and intra-DC opportunities
  10. 10. Thank you IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA 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 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.
  11. 11. © 2020 ADVA. All rights reserved.1111 400G-ZR data center interconnect ~40km ~80km [adapted from: OIF-400GZR-09. Draft]
  12. 12. © 2020 ADVA. All rights reserved.1212 Coherent optics for cable networks 20-80 km <3 km