Span Design Considerations in TAT-14 US Backhaul

Roderick Dottin – Orange Business Services October 8, 2014

100G ULH DWDM across G.652 fiber

interne Orange 2

Orange SWAP Project – Overall Planning

2014 2017

2016

No

swap in

France

2016 2015

2014

2015

International Network 2013

Pilot Launched between

Bordeaux and Madrid

EoY’ 2013

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Orange SWAP Project – Overall Planning (Cont'd)

TAT-14 US

Backhaul

Trans-Atlantic

New York

Philadelphia

North route

South route

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DWDM not simply Dumb Fat Pipe

Integrated ROADM + OTN network elements support flexible channel grid

spacing and colourless MxN WSS allowing any Client-Side OTN

transponder to connect to any wavelength within any WDM degree

Provides scalable optical bypass and dynamic restoration within the core

Dark fiber assets (now classified as real estate) must be conditioned for

tighter link tolerances

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Optical Impairments – Chromatic Dispersion

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Optical Impairments – Polarization Mode Dispersion

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Mitigating Optical Impairments at Higher Data Rate

Spectrally-efficient modulation techniques, coherent receiver design and

Forward Error Correction (FEC) provide cost-effective solutions to improve

noise tolerance

Lowers sensitivity to dispersion impairments towards the same degree as

encountered with 10Gb/s

Allows for effective equalization strategies

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Link Design Key Performance Characteristics

Existing US Backhaul Span Design

9577-S9

9577-S8

9577-S7 9577-S6 9577-S5 20396-S008

20396-S007

20396-S005

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Orange 100G DWDM over G.652 – Span Design Solution

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TAT-14 US Backhaul Span Design (~20dB Loss/Span) based on 100G over

G.652 with Hard-Decision (HD) Forward Error Correction

Modified US Backhaul Express Route

Non-linear fiber impairments resulting from high launch power when

using Erbium Doped Fiber Amplifier (EDFA) approaches the span

reach limit achievable on standard singlemode fiber SMF-28

(G.652)

Tuckerton Hudson Philadelphia

Woodbridge

Hopewell AC Express

New York (XFT6) Manasquan

FO G652 – PMD: 0.5ps/sqrt(km)

79.8km – 19.5dB EOL 61km – 15.9dB EOL

105km – 24dB EOL 91.6km – 22.1dB EOL 37km – 11dB EOL 95.6km – 21.5dB EOL 172km – 41.28dB EOL 86km – 20.64dB EOL

Ashburn

Glass-Through

172km – 41.28dB EOL

TAT-14 US Backhaul – North Route

TAT-14 US Backhaul – South Route

Proposed extension to Ashburn VA POP

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Ultra Long Haul Span Reach

Link Budget Allocation 1

Co

propagating

Raman

Counter

propagating

Raman

K

2

EDFA

•••

1

K

2 •••

100G

100G

100G

100G

100G

100G

PLaunch

For Single Raman Amplified Span [3, 6]

The target transmission benchmark for 100G DWDM channels

should be specified at OSNR of 21.5 to 22.0 dB with better than

10-13 to 10-15 BER performance

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Bringing-Into-Service Test Guidelines

S.L.A.T.

Guidelines

Long-Term

BER

Guidelines

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Mid-Section Long-Term BER Testing

Daisy-chaining the DWDM channels under test increases the

number of bits generated by the number of spans traversed and

the number of paths end-end

4 x 10G (OTU2) into 1 x 40G (OTU3)

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References

Thanks !