La Fibre
Forum : => La Fibre FTTH (Fiber To The Home) => 
Dorsale Internet => Discussion démarrée par: minidou le 04 juillet 2013 à 21:32:41
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en utilisant des fibres en "spirale"?
New research by optical fiber experts at Boston University and optical communications systems experts at the University of Southern California created a new kind of optical fiber stable enough to transmit donut-shaped laser beams called optical vortices, also known as orbital angular momentum (OAM) beams. OAM beams are generating interest not only in communications, but also atom manipulation and optical tweezers.
They packed several colors into each mode and used multiple modes. Unlike in conventional fibers, OAM modes in these specially designed fibers can carry data streams across an optical fiber while remaining separate at the receiving end.
Ramachandran’s OAM fiber had four modes (an optical fiber typically has two), and he and Willner showed that for each OAM mode, they could transmit 400 Gb/s in just a single wavelength of light — or 1.6 Tb/s across 10 wavelengths — over the course of 0.68 miles (1.1 km).
“This is very impressive,” University of Rochester physicist Robert Boyd told Science. “I can imagine a huge commercial market.”
Il a l'air d'y croire, mais en pratique, ça à un intérêt s'il faut changer toutes les fibres par ces nouvelles fibres entortillées?
http://www.photonics.com/Article.aspx?AID=54269 (http://www.photonics.com/Article.aspx?AID=54269)
http://www.sciencemag.org/content/340/6140/1545.abstract (http://www.sciencemag.org/content/340/6140/1545.abstract)
http://www.sciencemag.org/content/suppl/2013/06/26/340.6140.1545.DC1/Bozinovic-SM.pdf (http://www.sciencemag.org/content/suppl/2013/06/26/340.6140.1545.DC1/Bozinovic-SM.pdf) (13 pages)
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Si on peut faire du coup 40 * 400 Gbps c'est pas grave de retirer du câble sur certains grands axes (pas pour du FTTH évidemment ;D )
Il est trop tard pour me plonger dans les explications, un autre jour peut être ^^
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Est-ce applicable aux câbles sous-marins?