A research team at Ericsson, in cooperation with a Swedish ICT research company, has now completed a field trial using advanced modulation and detection techniques. The trial running 112 Gbps on a single optical wavelength over an 824 km installed fiber route proved to be prosperous. As each fiber supports a number of wavelengths, the overall capacity of the fiber can be immense with this alternative technique.??

The upgrade procedure to 100G was successful and it was performed without touching any equipment on the path. The trial result points at a large potential when it comes to cost savings and the increase in utilization of the inherent capacity potential of the fiber.

The trial ran on an existing 10G engineered DWDM system connecting the Swedish cities; Stockholm and Hudiksvall. The used fiber link was looped back for a total of 12 spans.

The trial demonstrated advanced techniques such as dual-polarization 16-QAM modulation and coherent detection combined with sub-carrier multiplexing in the electronic domain. The tests involved broadband radio technology that enabled a substantial increase in utilization of the inherent capacity potential of the fiber.

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