Concentric Two-Ring Network (CTRN): RWA Algorithms and Protection Schemes

We proposed a concentric two-ring network (CTRN) for African continent in [1]. In this work, we extend our CTRN study by proposing little-arc-first (LAF) routing algorithm, first-matching (FM) wavelength assignment, and parallel-bridge and opposite-ring protection (OPP). Simulation experiments demonstrate that LAF and FM can improve network resource assignment, and OPP can enhance network robustness.