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ITU Kaleidoscope 2016ICTs for a Sustainable World
SPACE DIVISION MULTIPLEXING TECHNOLOGY:NEXT GENERATION
OPTICAL COMMUNICATION STRATEGY
Kazuhide NAKAJIMA, Takashi MATSUI, Kotaro SAITO, Taiji SAKAMOTO, and Noriyuki ARAKI
Access Network Service Systems Laboratories
NTT Corporation
Bangkok, Thailand14-16 November 2016
1Copyright©2016 NTT corp. All Rights Reserved.
Outline
Why we need space division multiplexing (SDM)?• Two major reasons
SDM in optical fibre cable• Available spatial dimensions & scalability of
multi-core fibre (MCF)
Standardization of MCF technology• Example milestone & key technologies
Conclusion
2Copyright©2016 NTT corp. All Rights Reserved.
Reason 1: Capacity crunch
Backbone NW will require >100 Tbit/s in late 2020s Maximum bandwidth of SMF is limited to around 100 Tbis/s
1980 1990 2000 2010 2020 2030 2040
1P
1T
1G
Year
Cap
acity (
bit/s
/fib
er)
100 Tbit/s
[http://jpn.nec.com/techrep/journal/g15/n03/pdf/150316.pdf]
3Copyright©2016 NTT corp. All Rights Reserved.
Reason 2: Fibre conjunction in CO & DC
Spreading optical network requires plenty of connection and wiring space N-space multiplexing directly realizes N-1-space saving
4Copyright©2016 NTT corp. All Rights Reserved.
SDM enables power efficient transmission system SDM realizes future transmission system in a sustainable manner
SDM as mandatory strategy
Maximum capacityunder limited pump power
SMF w/ EDFA 12-core & 12-EDFA
<36 Tbit/s 105 Tbit/s × 14350 km
[OFC’16, Th4C.1]
5Copyright©2016 NTT corp. All Rights Reserved.
Why we need space division multiplexing (SDM)?• Two major reasons
SDM in optical fibre cable• Available spatial dimensions & scalability of
multi-core fibre (MCF)
Standardization of MCF technology• Example milestone & key technologies
Conclusion
6Copyright©2016 NTT corp. All Rights Reserved.
Cable density is approaching the geometrical limit Additional cable requires further physical infrastructure & cost
High density cable can solve the problems?
7Copyright©2016 NTT corp. All Rights Reserved.
SDM in optical fibers
Optical fibre has been tailored in two dimensions, core and mode MCF can easily employ the single-mode technology
123
4567
89101112
13141516
171819
[OFC’16, Th5A.2]
Pioneer work on multi-core fiber
[Inao , 1979] [Naone, 1994]
8Copyright©2016 NTT corp. All Rights Reserved. 250 mm
Min. d in a thin cladding fiber
35-40 mm
L/2 > t MCF << Bundle
L/2 < t MCF >> Bundle
L/2 < t
-50
-45
-40
-35
-30
-25
-20
-15
-10
25 30 35 40 45 50 55
Cro
ssta
lk (dB
/100k
m)
Core pitch L (mm)
[12]
[13]
[14]
[15][16][17]
[18]
Design of MCF
MCF has three key geometrical parameters, D, t & L MCF with adequate geometrical parameter can provide considerable meaning in
terms of spatial multiplexing
9Copyright©2016 NTT corp. All Rights Reserved.
Scalability of MCF
A 35 mm L & t enable us to tailor 20 to 30 cores in terms of the cladding diameterand core arrangement
10Copyright©2016 NTT corp. All Rights Reserved.
Why we need space division multiplexing (SDM)?• Two major reasons
SDM in optical fibre cable• Available spatial dimensions & scalability of
multi-core fibre (MCF)
Standardization of MCF technology• Example milestone & key technologies
Conclusion
11Copyright©2016 NTT corp. All Rights Reserved.
Spreading phase of MCF
MCF optical wiring can be considered as the first deployment rather than MCFcore/metro transmission
Phase 2MCF P2P/Parallel
Phase 2.5MCF
Longhaul
Phase 3MCF Core/
Metro
Phase 1MCF Optical
Wiring
12Copyright©2016 NTT corp. All Rights Reserved.
Mass-producibility of MCF
A breakthrough is essential for realizing a long thick MCF A tiere approach to both application area and cladding diameter support the
smooth and effective deployment of MCF
13Copyright©2016 NTT corp. All Rights Reserved.
Key technology for MCF application
SDM optical wiring requires:Standard optical fiber & Connector/splicing & Cable/wiring
Phase & Application Area Key Technology
1. SDM optical wiring in CO/DC
MCF with standard propertiesConnector and splicing
Cabling and wiring
2. Long-haul point to pointtransmission system
245 mm coating SDM fibersOptical amplifier
Power efficient system design
3. Terrestrial metro/coreoptical link
Cost effective fiber fabricationOptical node/switching
14Copyright©2016 NTT corp. All Rights Reserved.
Optical property Compliance to G.652
Attenuation
Mode-field diameter
Cutoff wavelength
Chromatic dispersion
Macrobending loss
MCF with standard properties
Trench profile enables four-core in a 125 mm cladding diameter while keeping fullcompliance to conventional SMF
MCF with full compliance to SMF
[ECOC’14, We1.4.5]
15Copyright©2016 NTT corp. All Rights Reserved.
Connector & splicing technology
Standard connectors can be utilized to MCF Side view technique enables automatic angle alignment of MCF
[OECC’14, p. 872][Prof. Nagase]
MU & SC connectorswith precise angle
alignment mechanism
Fusion splicing based on side view monitoring
16Copyright©2016 NTT corp. All Rights Reserved.
Cabling & wiring technology
Manufactured mini-connector enables flexible wiring Combination of rotatable SC connector & PLC module enables to construct pluggable
add/drop link
ONU
ONU
ONU
4CF-IN 4CF-OUT
Add
portDrop
port
110 mm
50 mm
Pluggable add/drop link
[IWCS’16, 13-6]
17Copyright©2016 NTT corp. All Rights Reserved.
SDM is the mandatory strategy for future opticalcommunication system
A tier approach supports smooth & effective spreadof MCF application
Three key technologies, MCF with standard property,connector & splicing, and cabling & wiring, are readyfor discussing the real application of MCF
Conclusion