terabit transmission & software configurable...
TRANSCRIPT
Terabit Transmission & Software Configurable
OpticsDr. Kevin Smith, Transport Futures and Innovation
© British Telecommunications plc
Talk outline
• Innovations in high-capacity superchannel infrastructures
– New real-time 64GBaud technology
– Emerging software configurable flexible-rate optics
– Flexible grid & Superchannels
– Terabit Superchannel Protection
• Real-world technology trials and deployments
– Closed loop network running between the BT Tower and Adastral Park
– Live commercial flexible grid optical core link between London and Dublin
• Summary
Key Innovations: Degrees of freedom for scaling to
Terabit capacities
Bit
s p
er
Sym
bo
l
Symbol rate
Superchannel
16-QAM
(4bits/symbol)
QPSK
(2bits/Symbol)
25G 50G
2
4 Note: Dual polarisation
Modulation
Format
Bits per
symbol
(single/dual
polarisation)
Net
Baud-
rate
(Gbit/s)
Speed /
subcarrier
(Gbit/s)
Typical
Reach
(km)
Typical
OSNR
requirement
(dB)
QPSK 2/4 25 100* 2000 12
QPSK 2/4 50 200* 1000 16
16-QAM 4/8 25 200* 600 20
64-QAM 6/12 33 400* 150 26
4 x 100G
(QPSK)
2 x 200G
(16-QAM)
1 x 400G
(64-QAM)
150 GHz 75 GHz 50 GHz
The Next Generation: Gridless & optical superchannels
• Current WDM has rigid 50GHz grid structure
– Restricts evolution to Tbit/s speeds & spectral efficiency
• Future gridless infrastructure permits
– Bandwidth growth, 400G and beyond
– Improved fibre utilisation (spectral efficiency)
1.4T Superchannel comprising 7 x 200G (16-QAM) subchannels
8 Tbits/Link 16 Tbits/Link 25 Tbit/s/Link
Industry leading 64GBaud flexible rate optical
transponder technology
• Single slot 400G cards
– 2 optical line outputs
– 64Gbaud capable
– Long reach 200G capability
• Flexible modulation formats– 100G / QPSK
– 200G / 16-QAM
– 200G / QPSK (long reach 200G)
• One card – multiple applications
– Fast bandwidth uplift / upgrade
– Optical protection
– Simplified sparing and inventory
200G DP-QPSK
200G DP-16QAM
100G DP-QPSK
U2000 NMSOSN 9800
Optical Superchannels to 3 Terabit/s
• During the summer of 2014, we successfully
demonstrated error-free transport of up to
3Terabit/s over a fully managed field installed
Flexgrid link
• 3T (15 x 200G 16-QAM sub-carrier) superchannel.
• Real time, production grade hardware & software,
359km field installed fibre and WDM system.
• 3T superchannel co-propagates with conventional
50GHz 100G channels
• 33.5GHz subcarrier spacing giving a spectral
efficiency of 5.97bits/s/Hz, more than 49%
improvement over conventional 50GHz grid
• Configured and managed from BT’s live
Transmission Network Operations Centre (TNOC) in
Cambridge
Norwich
Adastral
park
Newmarket
Cambridge
Colchester
Basildon
Bishops Stortford
BT Tower
Wood green
77km83km
68km
35.805 km
64km
58.1km
62km
57.08km
24km
50.7km
13.8km
14.74km
Ipswich
BT Adastral
Park
BT Tower
Cambridge
TNOC
3T
Superchannel
(15 x 200G 16-QAM)
550 GHz
100G 100G100G
100G
3T
http://www.btplc.com/news/Articles/ShowArticle.cfm?ArticleID=476A9AC1-58A4-44EE-A067-871356A12950
400G Deployment in BT’s Live Network
Newry
Dundalk
Error free
10 & 100GE
over 400G
400G
10G, 40G, 100G & 400G
on Live Link
400G
2 x 200G
(16-QAM)
BELFASTTELEHOUSE
RIVERHOUSEDUBLIN
http://www.btireland.com/pr_2015_02_04_400gbps.shtml
Pushing the limits on capacity & spectral efficiency:
Demonstration of a 5.6Tb/s superchannel
• Error free performance for all the 28×200G DP–QPSK sub-channels with pre-FEC BER <5×10-5
• A small optical penalty (<1dB) for channel separations down to 60GHz compared to 75GHz spacing
• Error free performance achieved for channel spacing as narrow as 51GHz, an improvement of 47% in spectral efficiency
Demonstration of fast optical superchannel
capacity turn-up up to 2Tb per minute
• Modulation format switching time ~35s: (a) 100G QPSK to 200G QPSK; (b) 100G QPSK to 200G 16QAM
• Superchannel capacity switching time <75s from 2.6Tb/s (26×100G) to 5.2Tb/s (26×200G QPSK or 26×200G
16QAM) including 100GE client mapping over all sub-channels fast capacity uplift (network upgrade) of ~2Tb/min
Live 727km flexible grid optical link between
London and Dublin
• The trial was conducted in a live 727km flexible grid G.652 fibre link between London and Dublin with 10 spans including
an unrepeatered submarine cable of 133km• EDFA amplification except for the submarine link where hybrid Raman/EDFA is used
• Flexible grid ROADM nodes located in London, Slough, Bangor and Dublin for traffic ADD and DROP
• 64GBaud flexible rate transponders housed in Huawei 9800 chassis in London and Dublin
2Tb/s optical superchannel and flexible modulation
format signals operating alongside live traffic
• A spectral window of 1.4THz provisioned for the flexible rate 64GBaud optical channels
• 2Tb/s (10×200G QPSK) superchannel operating error free alongside live 40G/100G wavelengths
• A 100G QPSK and 200G 16QAM optical channel also achieving error free performance
• Long term error-free performance for all optical channels
• 200G DP-QPSK shows significantly larger margin and long reach capability
1.00E-05
1.00E-04
1.00E-03
1.00E-02
1.00E-01
0 2 4 6 8 10 12 14 16 18
Pre
-FE
C B
ER
Time (hour)
1 × 200G DP - 16QAM channel
1 × 100G DP - QPSK channel
10 × 200G DP - QPSK sub-channels
GTB Award: Fixed Infrastructure Innovation
From 5.6 Terabit/s Innovation to 2Tb/s Live International Trial
Operator: BT
Vendor: Huawei Technologies
http://www.btplc.com/news/#/pressreleases/bt-core-network-trials-break-world-speed-records-1418554
Its not all about speed …
25 Petabits !!
Terabit optical superchannel protection
4 x 100G
(QPSK)
2 x 200G
(16-QAM)BT Adastral
Park BT Tower
400G MAIN
400G
PROTECT
0.8T (Unprotected)
First field trial demonstration of superchannel
protection (400G) & in-service OTDR
400G service recoveryFibre fault location using
in-built OTDR
Summary• Our live trials were conducted over a 727km commercial flexible grid optical core link between
London and Dublin, based on Huawei’s OSN 9800/8800 and iManager U2000 platforms,
carrying live 40/100G customer traffic. The link includes a 133km long unrepeatered submarine
cable link from Dublin to Holyhead.
• A 2Tbps superchannel exploiting commercial flexible grid hardware and real-time flexible rate
64GBaud transponders operating with live 40/100G customer traffic.
• Successful demonstration of real-time 200G 64GBaud transponders allowing all-optical, long
reach (unregenerated) transmission with low latency.
• By exploiting flexible rate transponders, we successfully demonstrated fast capacity turn up
(or network upgrade) equivalent to ~2Tbps in one minute.
• Successful demonstration of a real-time 5.6Tbps superchannel, comprising 28 x 200Gb/s
(64GBaud/QPSK) sub-channels, over a 359km closed loop link running between the BT Tower
and Adastral Park and achieving highest capacity and spectral efficiency.
• Successful field trial demonstrations of optical superchannel protection (400G) and in-service
OTDR fibre fault location.
Acknowledgements
BT: Y. R. Zhou, S. West, M. Johnston, J. Weatherhead, P. Weir, J. Hammond, A. Lord, A. Sugrue,
G. O’Hara, C. Harpur, S. Duff, N. Sheeran, E. Harrington, D. Nolan, D. Gosai, and P. McSorley.
Huawei: J. Chen, W. Pan, C. Cao, R. Yang, N. Zhou, S. Wu J. McGrath, D. Tanasoiu, Z. Xiao, J.
Dwyer, A McConnell, N. Abraham and A. Pigott.