Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Separate signals through optical fibres for ultrafast home network

28.01.2008
Dutch-sponsored researcher Christos Tsekrekos has investigated how a small network for at home or in a company can function optimally.

His research analyses the MGDM technique (Mode Group Diversity Multiplexing) of the Eindhoven University of Technology. This technique transmits each TV, telephone and Internet signal via a separate group of light rays through the optical fibre cable. Such a technology has not yet been marketed. Yet in the ideal situation it could be applied in a glass or polymer fibre, has the potential of being cheap, and transmits all information without disruption.

Existing systems for small networks at home or in a company make use of multimode glass fibres or multimode polymer optical fibres (POF). The latter are relatively thick cables (about 1 mm thick, thus thicker than the glass fibre which is 0.125 ƒÝm thick). Multimode fibre cables can conduct many light rays and can operate free of disruption and with a greater bandwidth than a wireless connection. However, due to a slight variation in the speed of the light rays through the multimode fibre, a signal transmitted by all of these rays becomes spread out. Consequently, the signals become broader and therefore fewer signals fit in the fibre, limiting the transmission capacity.

Independent channels
Tsekrekos investigated how the MGDM technique can increase the capacity of a multimode fibre network. He created independent channels by dividing the total group of light rays into groups of closely related light rays (or modes). Using special optical and electrical techniques, Tsekrekos investigated how the crosstalk between these groups could be eliminated so as to render these groups independent of each other. This step allows several groups to be used in parallel, thereby increasing the fibre's capacity. Moreover, each group can transport its own type of signal, which means that TV, telephone and Internet signals can be transmitted though the same fibre.

Using this approach the researcher constructed a simple yet stable MGDM system. The system works well up to distances of 1 km of multimode glass fibre with a core diameter of 62.5 ƒÝm. Tsekrekos invented a new mode-selective spatial filter (MSSF), based on lenses with specific characteristics, to make the system reliable and to allow a large number of channels to be realised. This can result in a stable and transparent five-channel MGDM system.

Philips, Draka Fibre, TNO-ICT, and several electrical contractors are supervising this project in the Technology Foundation STW users' committee. Philips and TNO-ICT are very interested in home networks that can flexibly transport a wide range of signals. The MGDM technology together with thick multimode glass or polymer fibres will soon make it possible for consumers to simply install a universal and high capacity broadband network at home. Draka Fibre (in Eindhoven) considers the MGDM technology to be a highly promising means of obtaining even more capacity and possible applications out of this type of fibre. Further research should lead to a greater increase of the multiplex factors in more complex network structures.

Dr. Christos Tsekrekos | EurekAlert!
Further information:
http://www.tue.nl

More articles from Information Technology:

nachricht Research alliance: TRUMPF and Fraunhofer IPA ramping up artificial intelligence for industrial use
06.08.2020 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA

nachricht Novel approach improves graphene-based supercapacitors
03.08.2020 | University of Technology Sydney

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: ScanCut project completed: laser cutting enables more intricate plug connector designs

Scientists at the Fraunhofer Institute for Laser Technology ILT have come up with a striking new addition to contact stamping technologies in the ERDF research project ScanCut. In collaboration with industry partners from North Rhine-Westphalia, the Aachen-based team of researchers developed a hybrid manufacturing process for the laser cutting of thin-walled metal strips. This new process makes it possible to fabricate even the tiniest details of contact parts in an eco-friendly, high-precision and efficient manner.

Plug connectors are tiny and, at first glance, unremarkable – yet modern vehicles would be unable to function without them. Several thousand plug connectors...

Im Focus: New Strategy Against Osteoporosis

An international research team has found a new approach that may be able to reduce bone loss in osteoporosis and maintain bone health.

Osteoporosis is the most common age-related bone disease which affects hundreds of millions of individuals worldwide. It is estimated that one in three women...

Im Focus: AI & single-cell genomics

New software predicts cell fate

Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...

Im Focus: TU Graz Researchers synthesize nanoparticles tailored for special applications

“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.

Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...

Im Focus: Tailored light inspired by nature

An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.

Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“Conference on Laser Polishing – LaP 2020”: The final touches for surfaces

23.07.2020 | Event News

Conference radar for cybersecurity

21.07.2020 | Event News

Contact Tracing Apps against COVID-19: German National Academy Leopoldina hosts international virtual panel discussion

07.07.2020 | Event News

 
Latest News

Rare Earth Elements in Norwegian Fjords?

06.08.2020 | Earth Sciences

Anode material for safe batteries with a long cycle life

06.08.2020 | Power and Electrical Engineering

Turning carbon dioxide into liquid fuel

06.08.2020 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>