Patent ID: 8090257

Claim:
An optical communication system comprising: a plurality of optical communication apparatuses each comprising an optical cross connector for switching a route of an optical path with an optical signal kept as it stands; a plurality of optical fiber WDM transfer links for making a connection between said optical communication apparatuses; and a control channel for making a connection between each of a plurality of said optical communication apparatuses and the other, wherein each of said plurality of said optical communication apparatuses comprises: a first monitor; a second monitor; an alarm comparator for comparing an alarm status of the optical path being preserved by said first monitor with an alarm status of the optical path being preserved by said second monitor; and a detour executor for determine whether or not a fault of the optical path exists according to a comparison result of the alarm statuses of the optical paths that said first monitor and said second monitor preserve, and making a section detour around one part of the optical path including a faulty location.