XT-considered multiple backup paths and resources shared protection scheme based on ring covers.

Area of Science:

• Optical networking
• Telecommunications
• Network survivability

Background:

• Resource allocation in optical networks is complex due to Space Division Multiplexing (SDM) and flexible grid technology.
• Existing research on SDM-EONs primarily focuses on link protection or restoration, with limited investigation into survivability using ring covers.
• Ring cover protection schemes offer benefits like reduced restoration time and costs, but their application to the Routing, Spectrum, and Core Assignment (RSCA) problem in SDM-EONs is underexplored.

Purpose of the Study:

• To deepen the investigation of survivability in SDM-EONs by focusing on link protection strategies.
• To address the underexplored Routing, Spectrum, and Core Assignment (RSCA) problem for link protection in SDM-EONs utilizing ring covers.
• To propose and evaluate novel algorithms for enhancing network survivability and optimizing resource utilization in SDM-EONs.

Main Methods:

• Selecting an optimal set of rings for link protection across the network topology, adhering to specified constraints.
• Developing an algorithm to recover traffic disrupted by link failures, leveraging the selected ring cover.
• Implementing resource allocation algorithms that satisfy spectrum contiguity and core continuity constraints, considering physical impairments.

Main Results:

• The proposed algorithms effectively select rings for comprehensive link protection and traffic recovery.
• The developed protection scheme successfully recovers at least 72.8% of traffic under simulated link failures with 1000 traffic requests.
• Resource allocation considering both spatial and spectral dimensions leads to improved survivability outcomes.

Conclusions:

• The study successfully enhances the survivability of SDM-EONs through a novel ring cover-based link protection strategy.
• The proposed algorithms demonstrate significant effectiveness in traffic recovery and resource management under failure scenarios.
• This work contributes a valuable approach to addressing the RSCA problem in SDM-EONs, improving overall network resilience.