Multi-core and Few-mode Fiber Technology for Space...

Copyright©2016 NTT corp. All Rights Reserved.

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

Kazuhide Nakajima

Access Network Service Systems Laboratories

NTT Corporation

1 Copyright©2016 NTT corp. All Rights Reserved.

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


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


The density of the latest optical fibre cable is close to the geometrical limit, and further SMFs require the infrastructure to be rebuilt

Can many SMFs resolve the “capacity crunch”?

-2


Other than “capacity crunch”?

The latest transmission system with a larger transmission capacity also requires higher CAPEX/OPEX and power consumption per bit.

Tx Rx

Tx Rx

Tx Rx

Tx Rx

SDM in passive element supports CAPEX and/or

OPEX reduction.

SDM in active element supports lower power

consumption.


2nd Question






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.

0

20

40

60

80

100

120

2008 2010 2012 2014 2016 2018

Num

ber

of

spat

ial ch

anne

l

Year

123

4567

89101112

13141516

171819

FMF

MCF

FM-MCF


Does MCF Provide a Spatial Advantage?

MCF has three key geometrical parameters The relationship between L and t determines the advantage of MCF

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


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


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


3rd Question






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 2.5 MCF

Longhaul

Phase 3 MCF Core/

Metro

Phase 1 MCF Optical

Wiring

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


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


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


Why should we consider SDM?

What is the scalability of SDM fibre?

When we can use SDM?

Conclusion

A tiered approach will accelerate smooth and effective deployment, and key technologies are ready for discussion

SDM is a mandatory strategy for future optical communication systems

20 to 30 spatial channels can be tailored by optimizing the cladding diameter and core arrangement


Acknowledgement Research on space division multiplexing technologies has been supported by the National Institute of Information and Communications Technology (NICT), Japan as

Thank you for your kind attention! 4th Question?

Date post:	23-May-2020
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