Nodal Stub-Release in All-Optical Networks

In wavelength-routed networks, the scarcity of wavelength-converters severely impacts successful connection recovery. This can be mitigated by releasing the connection´s stubs (i.e. the surviving upstream and downstream span and node resources) prior to the restoration process. Releasing span resources however heavily complicates the reversion process. In this study, we present a nodal stub-release method, where only node resources (i.e. wavelength-converters) are released, while the stubs´ span resources are kept occupied. Our simulation results show that the nodal stub-release method can match the performance of full stub-release (releasing both span and node resources) while keeping complexity low.