An optical matrix protection system is described. Optical signals that are cross-connected by a N.times.N matrix switch are routed through alternative protection paths using an optical matrix protection system. The optical matrix protection system includes a N.times.1 optical switch and a 1.times.N optical...http://www.google.fr/patents/US6307653?utm_source=gb-gplus-shareBrevet US6307653 - Optical matrix protection system
