Abstract
This paper investigates the double-link protection in optical networks using pre-configured cycles (p-cycles) protection. The objectives of this work are to efficiently use redundant resources while providing double-link protection and reducing the computational complexity of the optimization model in an optical network. To accomplish these, we propose a SinGle p-Cycle (SG) method, which requires one p-cycle to protect a link from double-link failures. We formulated the Integer Linear Program for SG and DouBle cycle (DB) method. Simulation results obtained for SG are compared with DB, Improved DouBle cycle, and Link Pair Method (LPM) based on spare capacity and computation time. The computational complexity of SG is reduced by an order for the number of cycles compared to other p-cycles-based double-link protection methods. We demonstrate a significant reduction in computation time and spare capacity for the SG method for the same working capacity of an optical network. The SG method also computes spare capacity for big networks such as Net4, cost239, and USA Long haul.
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