ZTE sets new world record in 400G ultra-long transmission


As more users migrate to new 4G networks, using fibre intelligently will mean users are able to get the most out of their mobile networks, based on very fat fibre backbones

ZTE Corporation, provider of telecoms equipment, network solutions and mobile devices, has stated it has set a new world record in 400G high speed transmission over fibre.

The company has more than doubled the record transmission distance for single carrier 400G, to 2800km. This technology will enable operators to pack tremendous amounts of data over fibre, and over this distance new possibilities are opened up for intercontinental communications.

Additionally, as more users migrate to new 4G mobile networks, using fibre intelligently in this way to move data from country to country will mean that end users are able to get the most out of their mobile networks, based on very fat fibre backbones for the transmission of the maximum amount of data over long distances.

In the experiment, ZTE used its own patented technology to achieve 40 dense wavelength division multiplexing (DWDM) channels of 400Gbps single carrier polarisation division multiplexing QPSK (PDM-QPSK) signals to successfully transmit 2800km in standard single mode fibre, smashing the world record of 1200km transmission distance of single carrier 400G.

This experiment achieved a successful long distance transmission of 2800km (35 spans, 80km per span), demonstrating the feasibility of deploying beyond 100G in the current fibre transmission system with an ultra-long haul optical reach. At the same time, the single carrier system reaches 108Gbaud, the highest symbol rate in the industry.

Single-carrier transmission has simple transmitting and receiving structures and is easy to manage, therefore it is the preferred solution to increase channel rate and system capacity according to ZTE. The previous record for single carrier 400G transmission of 1200km used special expensive fibres and all-optical Raman amplification technology.

In this experiment, ZTE used its patent technology to achieve 40 DWDM channels of 400Gbps. Single carrier PDM-QPSK signals is a highly developed modulation scheme with the acute receiver sensitivity. The technology makes it possible to employ widely used standard single mode fibres and ordinary Erbium-doped Fibre Amplifiers (EDFAs) to achieve ultra-long distance system transmission without major modifications to the already deployed fibre infrastructure.

ZTE has long been committed to the development of 100G and 400G/1T technologies as well as R&D and the application of product solutions. Utilising its R&D of cutting edge 100G and beyond 100G high speed signal transmission technologies, ZTE has tackled several key technologies in this field in the recent years with successful results.

ZTE has a long history in optical networking. As global communication networks entered 100G channel rate in 2010, ZTE launched the industry's first full range 100G bearing solutions, providing 100G products ranging from switches and routers to WDM OTN equipment and end to end solutions from edge layer to core layer.


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