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Filter tech zaps noise in next-gen optical networks

Posted: 13 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:optical communications? filter? superstructured fibre?

Researchers at the Optoelectronics Research Centre (ORC) within the University of Southampton, United Kingdom, announced they have developed a filter that can be used in high bit-rate optical systems to remove noise introduced when signals are transmitted over long distances.

The scientists tout that the technology has the potential to eliminate noise altogether in next generation optical networks, and create much clearer signals. They suggest the advance helps overcome the current requirement to convert optical signals into electrical ones for further processing and that the filter enables a much more effective way of transmitting and controlling signals because transmission speeds are not restricted to the slower speeds associated with electronic switches.

The application of the filters has been tested on a 160Gbps testbed at the COM Centre in Copenhagen, Denmark. The ORC has been working on such filters, formed using superstructured fibre Bragg grating technology, for a considerable time.

"Superstructured fibre Bragg grating filters have several advantages over alternative solutions," says Dr Periklis Petropoulos, a member of the research team at the ORC. "These filters are more compact and we can produce them in large volumes without the need of any special phase masks, making them much more cost effective. In addition, our filters are not polarization sensitive which means that they are easier to apply to a real system."

Full results of the joint experiment with the team at the COM Centre will be outlined in an invited paper at Europe's largest optical communications event, ECOC in Berlin, Germany. Detailed results will be presented by Dr. Francesca Parmigiani, another member of the ORC team.

John Walko
EE Times Europe

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