A novel approach for protecting multicast sessions in metropolitan WDM ring networks

A method for protecting multicast sessions in metropolitan WDM ring networks was presented. The SONET like self-healing schemes based on unidirectional fibers and bidirectional fibers are used for addressing the multicast protection problems. The multicast protection in SONET like self-healing WDM ring networks employs unidirectional ring with two unidirectional fibers, bidirectional ring with two unidirectional fibers and bidirectional rings with four unidirectional fibers. Multicast protection in systems employing bidirectional fibers include bidirectional ring with one bidirectional fiber and bidirectional ring with two bidirectional fibers.