At the Optical Fiber Communication Conference in San Diego, Nokia Siemens Networks (NSN) is demonstrating a new platform – the hiT 7300 coherent 40G transponder – to enable service providers to transition to 40G optical transmission networks.

“The increasing uptake in mobile broadband triggered by smart device usage and new Internet-based applications means we are all generating much more data traffic,” said Oliver Jahreis, head of product management DWDM at Nokia Siemens Networks, in a statement. “Existing capacity constraints are leading many operators to consider undertaking the move to 40G."

The hiT 7300 coherent 40G transponder platform lets operators deploy 40G transmission systems without the fiber measurement currently required for other systems. In new deployments, operators can avoid even the need for dispersion compensating modules, leading to low-latency connections and simplified amplifier design.

In addition, the NSN transponder supports 40G transmission over older fiber – dating back to the 1990s and earlier. It utilizes the installed network infrastructure by using “coherent transmission” technology, in particular a modulation format called CP-QPSK (coherent polarization multiplexed quadrature phase shift keying).

The transponder is designed to be seamlessly integrated into NSN’s hiT 7300 dense wave division multiplexing (DWDM) platform, which has been deployed for more than 80 customers worldwide.

The Daily


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