The present invention relates to a technology of an IP node for transferring IP packets accommodated in a wavelength division multiplexing optical signal. The optical IP node of the present invention includes a space switch unit supplied with a wavelength division multiplexing optical signal and a packet...http://www.google.de/patents/US6708000?utm_source=gb-gplus-sharePatent US6708000 - Photonic node, photonic nodes for transmission and reception, and method of restoring traffic upon occurrence of link failure in optical path network
