The fun thing is fiber at rates beyond 10 Gbps over long distances require just as many DSP tricks as DSL. For example http://www.lightwaveonline.com/article

The fun thing is fiber at rates beyond 10 Gbps over long distances require just as many DSP tricks as DSL. For example http://www.lightwaveonline.com/articles/2014/09/fujitsu-ntt-nec-send-400g-across-10-000-km.html http://www.lightwaveonline.com/articles/2014/09/fujitsu-ntt-...