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



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