Nokia and Facebook Boost Subsea Fiber Capacity

Nokia and Facebook have collaborated on field trials of new optical digital signal processing technologies over a 5,500 kilometer transatlantic subsea link.

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.

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.

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.”

Share this article

Follow Subsea World News

Events>

<< Aug 2019 >>
MTWTFSS
29 30 31 1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31 1

Submarine Networks World 2019

As the key annual gathering for decision makers in the subsea communications value chain, they offer a dedicated platform…

read more >

8th International Conference 2019 Offshore Wind Power Substations

The International Conference Offshore Wind Power Substations is a technical event for experts in the wind industry.

read more >

Wind Turbine Towers

Wind Turbine Towers is a technical event for experts in the wind industry and the goal is to push forward technical development for future tower concepts.

read more >

Seatrade Europe 2019

The three day event will  take place in the hub of the European cruise industry, Hamburg; Germany…

read more >