Nokia and Facebook break subsea spectral efficiency records in transatlantic field tests
March 21 2017 - 9:02AM
Press Release
- Nokia and Facebook successfully completed multiple submarine
field trials over a 5,500 km submarine cable between New York and
Ireland
- This submarine field trial of Nokia Bell Labs' new
probabilistic constellation shaping (PCS) technology used shaped
64-QAM, which achieved a record spectral efficiency of 7.46 b/s/Hz
and increased the stated capacity of the system by almost 2.5
times
- The test also included a successful 11,000 km round trip
submarine transmission using shaped 64-QAM achieving a record
spectral efficiency of 5.68 b/s/Hz and a first demonstration of 200
Gb/s and 250 Gb/s wavelengths and 16-QAM modulation over a
transatlantic submarine route using a real-time coherent DSP
21 March 2017
Espoo, Finland - Nokia and Facebook have collaborated on
field trials of new optical digital signal processing technologies
over a 5,500 kilometer transatlantic subsea link.
As bandwidth-hungry applications such as video and virtual
reality become accessible to more people around the world, scaling
the telecommunications infrastructure that supports them is a
significant challenge. To increase the capacity capabilities of
subsea fiber, Nokia and Facebook tested Nokia Bell Labs' new
probabilistic constellation shaping (PCS) technology. The test
showed an increase of almost 2.5x more capacity than the stated
optical transmission capacity of the system, demonstrating the
feasibility of the technology across a challenging real-world
fiber-optic network.
PCS, an area of active Nokia Bell Labs research, is a novel
technique that uses 'shaped' quadrature amplitude modulation (QAM)
formats to flexibly adjust transmission capacity to near the
physical limits of a given fiber-optic link. In this
first-of-its-kind experiment for an installed submarine link,
conceived and planned by Facebook, PCS based on 64 QAM, combined
with digital nonlinearity compensation and low-linewidth lasers,
achieved a record spectral efficiency of 7.46 b/s/Hz, indicating
the potential to upgrade this cable to 32 Tb/s per fiber in the
future.
Transmission tests based on the commercially available Nokia
Photonic Service Engine 2 (PSE-2) validated the successful
transmission of 8-QAM wavelengths running at 200 Gb/s and 16-QAM
wavelengths running at 250 Gb/s - a first for transatlantic
transmission. 200G 8-QAM wavelengths supported a spectral
efficiency of 4 b/s/Hz while exhibiting sufficient performance
margin to support reliable, commercial operation.
The results of the trial will be presented in a post-deadline
paper at the Optical Fiber Communication Conference and Exhibition
(OFC), March 21-23 in Los Angeles, CA.
Dr. Stephen Grubb, global optical network architect at
Facebook, said: "Facebook wants to increase the pace of
innovation and adoption of next-generation optical technologies.
This field trial with Nokia demonstrates that the scalable optical
technology of PCS together with narrow linewidth laser sources can
achieve capacities extremely close to the Shannon limit. This
ensures that we are both maximizing our investment in submarine
cable systems, as well as continuing to drive the cost per bit of
submarine transport lower."
Sam Bucci, head of optical networking at Nokia, said: "We
are thrilled to partner with Facebook to promote our common
commitment to accelerating innovation in optical transmission. By
demonstrating promising areas of Nokia Bell Labs research such as
PCS, as well as coherent technologies available today, we hope to
chart a path forward for the industry towards higher capacities,
greater reach, and more network flexibility."
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Media Enquiries:Sarah Miller Nokia IP & Optical
CommunicationsPhone: +613 720
9716Email: sarah.miller@nokia.comTwitter: @sarahjmiller2
Nokia CommunicationsPhone: +358 10 448
4900Email: press.services@nokia.com
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