Super-channels and the Future of Optical Networks
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Super-channels and the Future of Optical Networks

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Presented at IEEE Comsoc SCV Meeting, Santa Clara, CA, March 14, 2012

Presented at IEEE Comsoc SCV Meeting, Santa Clara, CA, March 14, 2012

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Super-channels and the Future of Optical Networks Presentation Transcript

  • 1. What comes after 100G? DWDM Super-channels Abhijeet Deore Senior Manager, Solutions Marketing Infinera Corp.1 | Infinera Confidential & Proprietary
  • 2. Agenda What is a super-channel? Practical implementation issues Super-channel related standards Infinera Super-channel Vision2 | Infinera Confidential & Proprietary
  • 3. What is a “super-channel” Why do service providers need this technology?Super-channel: several optical carriers combined to create a channel of desired capacity Traffic Growth Turn up more capacity in a single operational cycle 1 Tb Super-ChannelScale fiber capacity and reach 500G Super-Channel Support next generation data service rates 100G DWDM Cloud 40G DWDM Mobile 10G DWDM Video 2.5G DWDM Broadband 1998 2000 2002 2004 2006 2008 2010 2012 20143 | Infinera Confidential & Proprietary
  • 4. How do we get to >100G ? The way 1Tb/s is brought into service today 100G Line Card 100G Line Card 100G Line Card 100G Line Card 100G Line Card 100G Line Card 100G Line Card 100G Line Card  Bulky 100G Line Card  Power-hungry 100G Line Card  Does not scale operationally4 | Infinera Confidential & Proprietary
  • 5. What are the properties of a super-channel? A super-channel implements multiple carriers - ideally in a single line card… All carriers are provisioned in a single operational cycle… It’s practical to build… Line Card It has excellent optical performance And is seen as a single unit of capacity by the services that use it5 | Infinera Confidential & Proprietary
  • 6. Why do we need multi-carrier super-channels? C Band 1 Tb/s PM-QPSK 375 GHz 375 GHz 375 GHz 1 Laser 2 Lasers 10 Lasers 4 modulators 8 modulators 40 Modulators 320 Gbaud Electronics 160 Gbaud Electronics 32 GBaud electronics ~ 11 nm Silicon ~16nm Silicon ~32nm Silicon Time to Market: ~10 years Time to Market: ~7 years Time to Market: ~1 year Must be spectrally efficient, and possible to manufacture6 | Infinera Confidential & Proprietary
  • 7. Moving to higher order modulation  PM-QPSK is the modulation technique of choice for 100G  So what is the impact of moving to higher order modulation (e.g. 16QAM)?  The Short Answer: Increased spectral efficiency Shorter optical reach before regeneration needed7 | Infinera Confidential & Proprietary
  • 8. More Bits per Symbol: Optical Performance vs Fiber Capacity + Coherent Detection Decreasing Reach BPSK 1 bit per symbol QPSK 2 bits per symbol 8QAM 3 bits per symbol Increasing Capacity16QAM 4 bit per symbol More bits per symbol = shorter reach8 | Infinera Confidential & Proprietary
  • 9. Types of super-channel (IETF Terminology) Split Spectrum Contiguous Spectrum (aka “FlexGrid”, “gridless”) G.694.1 50GHz Grid 500 GHz* 375 GHz Pros: Pros: Backwards compatible with ITU grid- Reclaim 25% “wasted” spectrum based ROADMs and line systems Cons: Cons: 25% “wasted” spectrum due to guard Incompatible with legacy WSS bands between channels ROADMs (fixed ITU grid) *Illustrative only; non-contiguous carriers9 | Infinera Confidential & Proprietary
  • 10. ITU-T: Grid vs Flex Grid  The “classic” 50GHz grid works well up to 100G  But what if you need, eg. a 1Tb/s PM-QPSK super-channel? • Use a 12.5GHz granularity FlexGrid • Should work for most permutations100G PM-QPSK 1T PM-QPSK 1T PM-16QAM SC DC 10 carrier SC (375GHz) 5 carrier SC (200 GHz) 50GHz 12.5GHz10 | Infinera Confidential & Proprietary
  • 11. Super-Channel Standards Work  Component standardization • Possible that OIF will extend its 100G work to cover super-channels  ITU-T G.694.1 Grid • A flex grid has been approved, based on 12.5GHz granularity  ITU-T SG15, Question 11 (aka “OTUadapt”) • Requirement emerging for flexible container sizing (cf. ODUFlex) • Proposed by Infinera, Finisar and Verizon  IETF CCAMP • Generalized Label for Super-Channel Assignment on Flexible Grid • Infinera and VZ co-author • OSPFTE extension to support GMPLS for Flex Grid • Infinera author  Line-side interoperability • Currently not a goal for the standards bodies11 | Infinera Confidential & Proprietary
  • 12. Infinera Super-channel Vision12 | Infinera Confidential & Proprietary
  • 13. Infinera Vision for Practical Super-Channels The 3 Pillars FlexCoherent modulation Integrated OTN switching PIC-based implementation13 | Infinera Confidential & Proprietary
  • 14. Why PIC’s make sense for super-channels ?14 | Infinera Confidential & Proprietary
  • 15. Large Scale PIC Implementation: More Compact, More Efficient, More Reliable A super-channel implements multiple carriers - ideally in a single line card… All carriers are provisioned in a single operational cycle PIC Excellent optical performance PICs • Simpler • Lower power • Higher reliability15 | Infinera Confidential & Proprietary
  • 16. PICs are the ideal way to implement super-channels Reliability and density are key issues… Competitor 100G line side card Competitor 500G line side cards Competitor 1T line side cards Infinera 1T super-channel Infinera 500G super-channel The MTBF is about the same per card Infinera PIC’s have surpassed 650 Million field hours with zero failures Competitive implementations need five cards to equal capacity ten16 | Infinera Confidential & Proprietary
  • 17. Switching is essential17 | Infinera Confidential & Proprietary
  • 18. Need for digital switching is increasing Switching is essential to maximize λ utilization 2017 Optical channel Example, Circa 2012 1T Super-Channel 26% Fill 80% Fill1x10G λ 2017 Service mix4x10G λ λ 40% fill 8x sub-λ Sub 10G3x10G λ 10G 40G 100G (Source: Ovum) Service rate ≠ Optical channel rate → Digital Switching Required18 | Infinera Confidential & Proprietary
  • 19. FlexCoherentTM makes Super-channels useable19 | Infinera Confidential & Proprietary
  • 20. FlexCoherentTM enables practical trade-offs With a single operation  FlexCoherent = “Dial-a-Reach”  Ability to optimize reach vs. capacity on a given link is key • Per super-channel modulation format control PM-QPSK PM-BPSK PM-16QAM Reach Capacity Ability to change modulation formats on the fly a must…20 | Infinera Confidential & Proprietary
  • 21. FlexCoherentTM Modulation Maximize flexibility, Minimize complexity A Metro B Subsea X Long Haul C 1Tb/s PM-16QAM 1Tb/s PM-QPSK 1Tb/s PM-BPSK Super-Channel Super-Channel Super-Channel21 | Infinera Confidential & Proprietary
  • 22. Summary  Super-Channels are the answer to the question “what comes after 100G?”  They address three key problems of scale • Turn up more capacity in a single operational cycle • Extract more total capacity from the fiber • Support next generation services “beyond 100G”  Key implementation criteria: • Large Scale Photonic Integration • FlexCoherent Modulation • Integrated OTN Switching22 | Infinera Confidential & Proprietary
  • 23. Thank You23 | Infinera Confidential & Proprietary