Monday, September 20, 2010

Fujitsu Develops Distortion-Compensation DSP for 100 Gbps

Researchers at Fujitsu have developed a digital signal processing algorithm that compensates for waveform distortion in 100 Gbps signals sent over hundreds of kilometers. The researchers believe their DSP could lead to 100 Gbps links at lower cost than today's 10 Gbps within five years.

Some of this research was conducted as part of the "Universal Link Project R&D" sponsored by Japan's National Institute of Information and Communications Technology (NICT). Fujitsu said that scaling conventional, non-linear dispersion compensation techniques would require massive circuits with more than 100 million logic gates. Its new signal-processing algorithm however, requires approximately one-quarter of circuit stages previously thought necessary. The technology has already been tested using a 112 Gbps signal over 1,200 km, and the signal quality using the new five-stage circuit was found to be comparable to that resulting from a conventional 20-stage circuit.