Straightforward upgrading of transmission systems to 4/spl times/10 Gbit/s through 617 km and 8/spl times/10 Gbit/s through 412 km of SMF
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E. Gottwald | A. Mattheus | Franko Küppers | B. Hein | Klaus Kotten | C.-J. Weiske | U. Gaubatz | L. Rapp | C. Das