Huawei, Turk Telekom conduct 2T WDM system trial on live network

Telecom equipment vendor Huawei on Thursday said that Turk Telekom has completed trial of a 2T WDM system on live network.

The field trial on Turk Telekom’s live network achieved 40 Tb/s C-band transmission over a single fiber, equivalent to simultaneous transmission of up to 10,000,000 channels of HD videos.

This the industry’s largest capacity and highest spectral efficiency (SE) to date, said Huawei in a statement.

The trial was over 307 km of G.652 fibers between Ankara, the capital of Turkey, and Cankiri. Using 32QAM modulation, the WDM system delivered a net SE of up to 8 b/s/Hz or 40Tb/s C-band transmission, meaning a capacity four times higher than mainstream commercial 100G systems.

In addition, using Hybrid QAM technology with 20 Tb/s capacities, the trial link consisted of fiber loop between Ankara and Istanbul, stretching 1,750 km without regeneration.


Hybrid QAM technology allows software-defined tuning of modulation formats such as QPSK, 8QAM, 16QAM, 32QAM, and 64QAM for different optical signals, bringing unprecedented flexibility in service-specific capacity and transmission distance configurations. This fits right in to the dynamic and programmable networking trends pervading the industry. The technology is also compatible with current WDM systems, effectively protecting operators’ infrastructure investment.

In 2010, Turk Telekom built the national backbone network that stretches more than 34,000 km using Huawei’s next-generation WDM system, and in 2012, it deployed Huawei’s coherent 100G solution. The Ankara-Istanbul link used in this trial is one of the busiest across Eurasia.

The ultra-large-capacity 40T field trial marks an important step forward in beyond-100G transport technology. It demonstrates the scalability potential of operators’ current network infrastructure in dealing with the upcoming digital flood.

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