Horizon 2020 EU Japan coordinated R&D project on Scalable And Flexible optical Architecture for Reconfigurable Infrastructure (SAFARI)

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1 Horizon 2020 & MIC funded SAFARI Project Scalable and Flexible optical Architecture for Reconfigurable Infrastructure Horizon 2020 EU Japan coordinated R&D project on Scalable And Flexible optical Architecture for Reconfigurable Infrastructure (SAFARI) 6 Oct, 2016 NTT Network Innovation Laboratories Yutaka Miyamoto

2 Overview and Target of SAFARI Project Scalable and Flexible optical Architecture for Reconfigurable Infrastructure (Oct.1, 2014 Sep. 30 th, 2017) Realization of various programmable technology (modulation formats, subcarrier numbers, core multiplicity) for future Pb/s-class optical network (over 1000-km distance) Openflow/SDN extension for novel programmability SDN Controller EMS Interface implementation for novel programmability EMS: Element Management System Dense space division multiplexing of optical fibre transmission systems (Core multiplicity > 30) MMF: Multimode Fibre MCF: Multicore Fibre SMF MMF MCF Scalable Optical Transport Network (OTN) with Manageable Flexibility Control High Core Count Single Mode Multicore Fibre HCC SM MCF Multicore Erbium Doped Fibre Amplifier (MC EDFA) HCC SM MCF Programmable spectral efficiency (Modulation formats) Programmable signal bandwidth (Subcarrier numbers) DSP Tx Rx DSP Control scheme for optical transport programmability beyond 400 Gb/s Joint testbed 2

3 Working package structure 3

4 WP3 Programmable optical hardware Verification and establishment of a control scheme for optical transport programmability beyond 400 Gb/s SDN Controller Openflow/SDN extension for novel programmability EMS Interface implementation for novel programmability Programmability utilization design for scalable network provisioning Scalable control of carrier network with an optimum degree of programmability Interworking between SDN and Physical Layer Abstraction of information from programmable elements and the fiber links and implementation of intermediate layer Emerging programmable functions of L0/L1 Develop and verify various flexible features of programmable optical hardware including carrier number, modulation format etc. 4

1 Ch.n WDM- MUX SDM- MUX Ch. 1 Multicore fibre Multicore EDFA Multicore fibre SDM- DEMUX Rxs Ch.1 Ch.n Signal processing TDM/WDM Ch.

5 WP4 Super capacity optical transport networks Investigation and development of MCF based dense SDM (Space Division Multiplexing) with high core counts ( 30) toward super capacity optical transport networks Signal processing Txs Ch.1 Ch.n WDM- MUX SDM- MUX Ch. 1 Multicore fibre Multicore EDFA Multicore fibre SDM- DEMUX Rxs Ch.1 Ch.n Signal processing TDM/WDM Ch.m TDM/WDM/SDM Multicore fibres Single-mode multicore fibre Multicore EDFA Signal processing for SDM 5

WP3: Use cases and MCF crosstalk issue We examined the control scheme of programmable optical hardware and investigated the use cases of the scalable and flexible optical networks.

6 WP3: Use cases and MCF crosstalk issue We examined the control scheme of programmable optical hardware and investigated the use cases of the scalable and flexible optical networks. We clarified the impact of inter core XT on network planning and control in an MCF deployment scenario. The use case was adopted in ONF Use cases for Carrier Grade SDN document in March, The contribution on the carrier grade SDN use case document with valuable and influential use case was awarded as the outstanding contributor from ONF on Sept. 7 th, ( and events/awards en < and events/awards en>) C C C C A Ultra-high capacity NW B SMF A SMF SMF B SMF SMF A MCF XT-Free B SMF MCF A MCF B Not XT-Free! 6

7 WP4: Requirements for designing SM MCFs more than 30 cores for DSDM Core count Trade off A eff larger than 80 μm 2 at 1550 nm for reducing nonlinearity Crosstalk (XT) less than 19 db/500 km for QPSK transmission Cladding diameter of smaller than 250 μm is desirable from the point of mechanical reliability. 7

8 WP4: Characteristics of each fabricated fibre 30 core 31 core 32 core Techniques for reducing XT Heterogeneous (trench and step index) Homogeneous and Quasi single mode Heterogeneous and Relaxing cutoff condition Core types Manufacturability Relatively bad Good Reasonable Layout Hexagonal closepacked structure packed structure Hexagonal close Square lattice structure 1550 nm A eff 77.3 μm μm μm nm total XT 35 db/500km 14 db/500km 33 db/500km Cladding diameter 229 μm 230 μm 242 μm Fibre length 9.6 km 11.0 km 51.4 km 8

9 WP4: Comparison with reported SM MCFs Core count Our target area Reported 30 core fibre 31 core fibre 32 core fibre 32-core fibre Heterogeneous cores (two-types core) XT at 1550 nm [db/100km] 32 core fibre has realized the highest core count and low XT simultaneously. Y. Sasaki et al., ECOC 2016, paper W.2.B.2. 9

10 Fully integrated cladding-pumped 32core-EYDFA inline amplifier with two pump couplers EYDF: Er/Yb-doped fiber Two pump couplers were employed to enhance the average population inversion. Delay Rx Tx. 1 x 32 splitter 60.2 km 32c-MC-EYDF FI FO 32-ch 32-core 32-core switch MCF MCF 32c-MCF Isolator 32c-MCF Isolator 51.4 km EDFA J. Saurabh et al., ECOC 2016, Postdeadline paper Th.3.A.1 10

16 Cladding[μm] 241.2 242 MFD[μm] 9.9 5.6 Loss/abs. 0.

11 Comparison between passive- and active fiber Passive MCF Active MC-EYDF MCF MC EYDF Avg. Pitch[μm] Max./min.[μm] 29.1/ /28.45 SD. [μm] Cladding[μm] MFD[μm] Loss/abs. Splice Loss with MCF <0.5 db 1±0.25 db Copyright 2014 NTT corp. All Rights Reserved. 11

WP4: 32 core Dense Space Division Multiplexing (DSDM) Long distance Transmission over 1644.8 km Demonstration of 32-core dense space division multiplexing (DSDM), long-haul transmission over 1644.

recirculating Crosstalk signal 32ch switch 2 Novel partial recirculating loop system Loop system configured to input recirculating signals into adjacent cores with larger crosstalk and

12 WP4: 32 core Dense Space Division Multiplexing (DSDM) Long distance Transmission over km Demonstration of 32-core dense space division multiplexing (DSDM), long-haul transmission over km World first demonstration of long-haul DSDM transmission exceeding 1000 km achieved in SAFARI project DWDM PDM-16QAM optical transmitting circuit Main signal Recirculating crosstalk signal Non recirculating Crosstalk signal 32ch switch 2 Novel partial recirculating loop system Loop system configured to input recirculating signals into adjacent cores with larger crosstalk and non-recirculating signals into all other cores Fan in 32 core Dense space division multiplexing (DSDM) fiber 51.4 km 32 loops Fan out 32ch switch Receiver circuit Receiver circuit Receiver circuit 1 Multicore fiber design and fabrication technology Heterogeneous, square lattice structure Three times larger number of cores within typical 243 m cladding diameter Low-crosstalk suitable for PDM-16QAM signal transmission exceeding 1000 km distance T. Mizuno et al., OFC 2016, Postdeadline paper Th5C.3 Mizuno et al, OFC2016 postdeadline paper Th5C.3,

WP4: 32 core dense SDM transmission experiment over 1000 km Measured Q factors of all 640 channels (32 DSDM x 20 DWDM) after 1644.8 km (=32 loops) transmission exceeded the FEC limit of 5.

13 WP4: 32 core dense SDM transmission experiment over 1000 km Measured Q factors of all 640 channels (32 DSDM x 20 DWDM) after km (=32 loops) transmission exceeded the FEC limit of 5.7 db Data rate: 78.6 Gb/s (12 Gbaud, PDM-16QAM) WDM: 12.5 GHz spacing, 20 wavelengths Capacity: 50.3 Tb/s core #16, wavelength #11 x-pol. y-pol. T. Mizuno et al., OFC 2016, Postdeadline paper Th5C.3 13

14 Summary SAFARI PJ overview WP3: Proposal of MCF-based network use cases WP4: High count SM-MCF WP4: High count EYDFA WP4: 32-core transmission experiment 14

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

Multi-core and Few-mode Fiber Technology for Space Division Multiplexing Transmission Kazuhide Nakajima Access Network Service Systems Laboratories NTT Corporation Outline Three questions about space division