In working path setting, a backup path is previously prepared assuming a link failure, and a demultiplexer of a bypass link is connected to a wavelength conversion repeater through an optical switch. Upon occurrence of a link failure, the wavelength conversion repeater is connected to a multiplexer of...http://www.google.es/patents/US7447398?utm_source=gb-gplus-sharePatente US7447398 - Optical crossconnect apparatus
