Affiliation: | 1. GET/ENST Bretagne, Optics Department, Technop?le de Brest-Iroise, 29285, Brest cedex, France 2. Athens Information Technology Center, P.O Box 68, Markopoulo Avenue Peania 190 02, Athens, Greece 3. France Télécom R&D, Technopole Anticipa, 2, avenue Pierre Marzin, 22307, Lannion cedex, France
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