Transparent optical self-healing ring communication network

摘要

An optical self-healing-ring communication network is described which comprises: a first optical communication line, forming a closed optical path; at least two add / drop nodes for optical signals, optically connected along the line; a second optical communication line forming a closed optical path and optically connected to said optical-signal add / drop nodes. Defined in the network is a first and a second mutually opposite travel directions of the optical signals, with respect to the position of the optical-signal add / drop nodes. At least one of said nodes further comprises selection means, controlled by the optical signals, for the selective dropping of the optical signals from one of the communication lines. At least one of the optical-signal add / drop nodes further comprises means for the simultaneous input of at least one optical signal in the first direction along the first communication line and in the second direction along the second communication line.