Super coherent optics on live network reaches 400Gbit/s

November 19, 2021 // By Nick Flaherty
Super coherent optics on live network reaches 400Gbit/s
Nokia and Orange have successfully tested super coherent optics on a live network, achieving end-to-end speeds of 400Gbit/s to boost bandwidth capacity.

The field trial is part of an upgrade of the Orange long-haul backbone network in France to support new high-bandwidth 400 Gbit/s, adding the ability to scale the fibre capacity up to 600Gbit/s. This is an increase in spectral efficiency by 50% compared to prior technologies on its long distance network and comes from using Nokia’s fifth generation  PSE-Vs super coherent optics in production-ready optical transport hardware. The prototypes were tested on the Orange network 16 months ago.

Orange and Nokia demonstrated error-free performance at a data rate of 600Gbit/s over a 914km network between Paris and Biarritz, under challenging  live network conditions. The fibre network consisted of 13 spans of Orange’s existing network, through multiple cascaded reconfigurable optical add/drop multiplers (ROADM), using 100GHz WDM spectrumchannels.  

“With the booming market bandwidth requirement and need for scalability and flexibility, it is important that Orange continues to support an ever-greater network scale and new high-bandwidth services across our terrestrial and subsea global footprint,” said Jean-Luc Vuillemin, Vice President of International Networks and Services at Orange.
“Validating super coherent optics with Nokia represents an important enabler for future-proof networks which will bring spectral efficiency and operational deployment flexibility to our customer solutions. Furthermore this technology will allow for power savings by nearly 50%, which is key to our objective of developing greener networks for our customers. ” 

“With the introduction of the PSE-Vs super coherent capabilities across our entire 1830 portfolio, Nokia enables spectrally-efficient transport at 600Gbps over real-world long haul networks, and 400Gbps services over ultra long haul networks spanning multiple 1000’s of kilometers,” said James Watt, Head of Optical Networks Division at Nokia.

Developed at Bell Labs in the US, PSE-V is used for Nokia high capacity transponders, packet-optical switches, disaggregated compact modular and subsea terminal platforms using probabilistic constellation shaping (PCS) with continuous baud rate adjustment, and supports higher wavelength capacities over longer distances – including support for 400G over any distance – over spectrally efficient 100GHz WDM channels while further reducing network costs and power consumption per bit. 

The next challenge is to reach 800Gbit/s over long distances, which has already been demonstrated in field tests.

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Picture: 
Nokia's 1830 PSS optical switch with the PSE-Vs digital signal processor used for 400Gbit/s links

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