ITU Kaleidoscope 2016 · PDF fileITU Kaleidoscope 2016 ... Long-haul point to point transmission system ... add/drop link ONU ONU ONU 4CF-IN 4CF-OUT Add port Drop port 110 mm

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

[email protected]

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


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]


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

https://www.google.co.jp/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwi8x8XR1aTNAhVE3KYKHV_QDu8QjRwIBw&url=https://agilecatcloud.com/2014/11/13/idc-2017%E5%B9%B4%E3%82%92%E5%A2%83%E3%81%AB%E3%83%87%E3%83%BC%E3%82%BF%E3%82%BB%E3%83%B3%E3%82%BF%E3%83%BC%E6%95%B0%E3%81%AF%E6%B8%9B%E5%B0%91%E3%81%AB%E3%81%84%E3%81%9F%E3%82%8B%E3%81%8C%E3%80%81/&psig=AFQjCNFt8-h_8zveWY8B4gbxPip9oyLC7A&ust=1465895772634079

https://www.google.co.jp/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwi8x8XR1aTNAhVE3KYKHV_QDu8QjRwIBw&url=https://agilecatcloud.com/2014/11/13/idc-2017%E5%B9%B4%E3%82%92%E5%A2%83%E3%81%AB%E3%83%87%E3%83%BC%E3%82%BF%E3%82%BB%E3%83%B3%E3%82%BF%E3%83%BC%E6%95%B0%E3%81%AF%E6%B8%9B%E5%B0%91%E3%81%AB%E3%81%84%E3%81%9F%E3%82%8B%E3%81%8C%E3%80%81/&psig=AFQjCNFt8-h_8zveWY8B4gbxPip9oyLC7A&ust=1465895772634079


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]






Conclusion


Cable density is approaching the geometrical limit Additional cable requires further physical infrastructure & cost

High density cable can solve the problems?


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


Scalability of MCF

A 35 mm L & t enable us to tailor 20 to 30 cores in terms of the cladding diameterand core arrangement






Conclusion


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


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


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


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]


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


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]


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

ITU Kaleidoscope 2016 · PDF fileITU Kaleidoscope 2016 ... Long-haul point to point transmission system ... add/drop link ONU ONU ONU 4CF-IN 4CF-OUT Add port Drop port 110 mm

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