Facebook и оптические сети связи презентация.pdf
- 1. How to Deliver Optical Network Evolution and Differentiation and Handle the Future Capacity Crunch as an Optical Industry Centre Dr. Stephen Grubb Global Optical Engineer Facebook June 29, 2016
- 2. Outline • Facebook Optical Metrics and Bandwidth Drivers • Facebook Data Centers and Global Optical Network • Open Submarine cable systems • Optical Network metrics • Directions of Optical Technology • Towards the Cognitive Optical Network • Conclusions
- 3. Facebook by the Numbers 1.65 Billion Users 1.09 Billion Daily Users 30 Billion Photos daily 60 Billion Messages daily
- 4. Emerging Bandwidth Drivers: Facebook Live
- 5. Emerging Bandwidth Drivers: Virtual Reality- Oculus Virtually Reality Applications : • Gaming • VR Video Content • Video Conferencing • VR Sports viewing • Future NGON Conferences ?
- 6. Virtual Reality (VR) Bandwidth Requirements 0 20 40 60 80 100 120 Text Photo IM 1 min video 1 min VR video 20 kB 350 kB 4 MB >100 MB Forbes Tech Blog, 3/16
- 7. Facebook Global Data Centers
- 8. Facebook Global Optical Network Links shown are schematic and do not represent the extensiveness of the Facebook Global Network
- 9. MAREA Submarine Cable 6,600 km 20 Tb/s per fiber 8 fps, 160 Tb/s Total Capacity First Open Cable System Provides diverse Trans-Atlantic routing
- 10. Why Buy Open Submarine Cables ? ▪ Best of breed in Wet plant and SLTE ▪ Drive wet plant vendors to higher capacity, lower cost, faster deployments ▪ Drive SLTE vendors to higher rates/capacities, lower cost per bit, flexible line card ▪ Designs incorporating Submarine links are now almost always POP to POP or DC to DC, need to separate out wet plant specifications ▪ Need to specify performance independent of a specific suppliers transponder ▪ Ability to commit to SLTE at later date than at beginning of longer wet plant build cycle--- critical with fast moving technology changes in SLTE ▪ Desire to fully integrate submarine and terrestrial network management- demarcations are blurring ▪ Ability to move fast with like-minded partners, often in new geographically diverse routes- drive aggressive systems specifications Facebook is driving this paradigm in our entire network
- 11. New Paradigm for Submarine Cable Connections C L S C L S Datacenter or POP Datacenter or POP • Demarcations between Submarine and Terrestrial Networks are blurring • Facebook is building One Global Integrated Network
- 12. Facebook Optical Network Metrics • Capacity / Scaling • Low cost and power per bit, high density, near continuous tuning of card capacity, reach • Speed of Service • Automated turn up and provisioning, network optimization • Agility • Modular ROADM (CD to CDC), add degrees, extend network • Flexibility • Flex modulation, flexgrid, flex clients (FlexEthernet) • Open API, SDN/NFV, support for 3rd party wavelength management • Resiliency and Redundancy • Facebook deploys multiple paths between data centers- 3 or 4
- 13. Generations of Coherent Technology • First Generation • 40 Gb/s Coherent, high PMD and CD Tolerance, HD-FEC • Second Generation Coherent • 100 Gb/s, SD-FEC, high PMD/CD tolerance, QPSK, BPSK • Third Generation Coherent • 100G-400G, additional modulation formats (8/16 QAM), high CD tolerance (280K psec/nm), cycle slip tolerance, improved SD-FEC, ability to compensate for high polarization rotation rates • Fourth Generation Coherent • 100 Gb/s- X Gb/s ? , more granular modulation formats, variable baud rate, variable FEC, variable grid spacing, higher NCG FEC, improved coherent algorithms
- 14. Relative Capacity, Reach and OSNR versus Modulation Format- the Log term of Shannon QPSK 8QAM 16QAM 32 QAM 64QAM Relative Capacity 1 1.5 2 3 4 Relative Reach 1.0 0.5 .20 .08 .03 OSNR Required 12 dB 16 dB 19 dB 23 dB 28 dB Large jumps in reach and required OSNR, more continuous variation desirable
- 15. Towards the “Cognitive” Optical Network Mod format(s), Baud Rate, grid spacing FEC OH, Connectivity, Spectrum allocation Margin…... ????
- 16. Conclusions • Facebook Optical Network Metrics • Capacity / Scaling • Low cost and power per bit, high density • Speed of Service • Agility • Flexibility - grid and line rate • Resiliency and Redundancy • Open Cable Submarine Systems, new paradigm to maximize performance of Submarine Cables • Facebook will extend this paradigm to the entire network • Cognitive Optical Networks • Next generation line cards to get improved bandwidth utilization and lower cost per bit, mine “excess” margin in network