Method and apparatus for guaranteeing a failure-recovery time in a wavelength-division multiplexing network

A computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method for guaranteeing a stated failure-recovery time in a wavelength-division multiplexing (WDM) network, the method comprising:

• receiving a request at an ingress node of the WDM network to establish a connection from a source to a destination through the WDM network, wherein the request includes the stated failure-recovery time;
• calculating a chain of restorable cycles within the WDM network between the ingress node associated with the source and an egress node associated with the destination, wherein each cycle in the chain of restorable cycles can guarantee the stated failure-recovery time;
• and
• selecting a section of each restorable cycle to be a primary path between the source and the destination through the restorable cycle.

An apparatus for guaranteeing a stated failure-recovery time in a wavelength-division multiplexing (WDM) network, comprising:

• a receiving mechanism configured to receive a request at an ingress node of the WDM network to establish a connection from a source to a destination through the WDM network, wherein the request includes the stated failure-recovery time;
• a calculating mechanism configured to calculate a chain of restorable cycles within the WDM network between the ingress node associated with the source and an egress node associated with the destination, wherein each cycle in the chain of restorable cycles can guarantee the stated failure-recovery time;
• and
• a selecting mechanism configured to select a section of each restorable cycle to be a primary path between the source and the destination through the restorable cycle.