Pan-European optical networking using wavelength division multiplexing. - Matthias Berger; Michel W. Chbat; Amaury Jourdan; Michel Sotom; Piet Demeester; Bart Van Caenegem; Poul J. Gødsvang; Bernhard Hein; Manfred Huber; Reinhard März; Alain Leclert; Torodd Olsen; et al. (IEEE Commun. Mag., 1997)