Optical Protection With Pre-Configured Backup Paths and Limited Backup Resource Sharing
In this paper, the authors consider provisioning protection in WDM optical networks with pre-configured backup paths. In the traditional protection approach, backup resources are not shared among pre-configured backup paths, and thus resources are not utilized efficiently. They propose a protection approach with the use of a switch architecture, which allows limited sharing of backup resources among pre-configured backup paths (referred to as Pre-configured Backup Protection with Limited Sharing (PBPLS)). The architecture uses switching components with a flexible feature of splitting optical power on need basis in addition to directing the power towards one output port only. Further, configuration can be done which connects two (or more) input ports to the same output port at the same time.