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Presentation given at Optical Networking USA 2014 conference in Dallas
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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
interne Orange 3
Orange SWAP Project – Overall Planning (Cont'd)
TAT-14 US
Backhaul
Trans-Atlantic
New York
Philadelphia
North route
South route
Orange presentation
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
Orange presentation
Optical Impairments – Chromatic Dispersion
Orange presentation
Optical Impairments – Polarization Mode Dispersion
Orange presentation
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
Orange presentation
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
Orange presentation
Orange 100G DWDM over G.652 – Span Design Solution
Orange presentation
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
Orange presentation
Orange presentation
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
Orange presentation
Bringing-Into-Service Test Guidelines
S.L.A.T.
Guidelines
Long-Term
BER
Guidelines
Orange presentation
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)
Orange presentation
References
Thanks !