Multi-core and Few-mode Fiber Technology for Space Division Multiplexing Transmission

Transcription

1 Multi-core and Few-mode Fiber Technology for Space Division Multiplexing Transmission Kazuhide Nakajima Access Network Service Systems Laboratories NTT Corporation

2 Outline Three questions about space division multiplexing (SDM) Should we consider SDM only as regards the capacity crunch? Does the scalability of SDM fibre have an advantage over a fibre bundle? How soon can we use SDM? Conclusion 1

3 Why SDM? Various data streams increase the transmission capacity, although the maximum bandwidth of conventional SMF is limited to around 100 Tbis/s 5G IoT M2M Sensor Network Connected Car 2

4 -2 Can many SMFs resolve the capacity crunch? The density of the latest optical fibre cable is close to the geometrical limit, and further SMFs require the infrastructure to be rebuilt 3

5 Other than capacity crunch? The latest transmission system with a larger transmission capacity also requires higher CAPEX/OPEX and power consumption per bit. Tx Tx Tx Tx Rx Rx Rx Rx SDM in passive element supports CAPEX and/or OPEX reduction. SDM in active element supports lower power consumption. 4

6 2nd Question Three questions about space division multiplexing (SDM) Should we consider SDM only as regards the capacity crunch? Does the scalability of SDM fibre have an advantage over a fibre bundle? How soon can we use SDM? Conclusion 5

7 Number of spatial channel State of the Art Optical fibre has historically been tailored in two dimensions. State of the art research has realized an SDM fibre with more than 100 spatial channels. 120 FM-MCF FMF MCF Year

8 Does MCF Provide a Spatial Advantage? MCF has three key geometrical parameters The relationship between L and t determines the advantage of MCF mm L/2 < t L/2 > t MCF << Bundle 250 mm Min. d in a thin cladding fiber L/2 < t MCF >> Bundle 7

9 Well-Designed MCF Realizes L/2 < t L of 30 to 40 mm realizes a crosstalk of -30 db/100km or less t of 35 to 40 mm is also available for realizing a feasible loss 8

10 MCF Scalability A 35 mm L and t enable 20 to 30 core multiplexing, and the core number can be tailored in terms of the cladding diameter and core arrangement 9

11 3rd Question Three questions about space division multiplexing (SDM) Should we consider SDM only as regards the capacity crunch? Does the scalability of SDM fibre have an advantage over a fibre bundle? How soon can we use SDM? Conclusion 10

12 Spreading Phase of MCF MCF optical wiring can be considered as the first deployment rather than MCF core/metro transmission Phase 2 MCF P2P/ Parallel Phase 1 MCF Optical Wiring Phase 3 MCF Core/ Metro Phase 2.5 MCF Longhaul 11

13 Mass-Producibility of MCF A breakthrough is essential for realizing a long thick MCF A tiered approach to both application area and cladding diameter support the smooth and effective deployment of MCF 12

14 Key Technologies are Ready for Discussion Two key technologies for MCF optical wiring, a 125 mm cladding diameter MCF and a connector/fusion splice, are ready for discussion as regards actual application 13

15 Conclusion Why should we consider SDM? SDM is a mandatory strategy for future optical communication systems What is the scalability of SDM fibre? 20 to 30 spatial channels can be tailored by optimizing the cladding diameter and core arrangement When we can use SDM? A tiered approach will accelerate smooth and effective deployment, and key technologies are ready for discussion 14

16 Thank you for your kind attention! 4th Question? Acknowledgement Research on space division multiplexing technologies has been supported by the National Institute of Information and Communications Technology (NICT), Japan as 15