Evolution of Terrestrial Optical System and Core Network Architecture. - Andreas Gladisch; Ralf-Peter Braun; Dirk Breuer; Armin Ehrhardt; Hans-Martin Foisel; Monika Jaeger; Ralph Leppla; Malte Schneiders; Sascha Vorbeck; Werner Weiershausen; Fritz-Joachim Westphal (Proc. IEEE, 2006)