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We present an application focused on the design of resilient long-reachpassive optical networks. We specifically consider dual-parented networkswhereby each customer must be connected to two metro sites via local exchangesites. An important property of such a placement is resilience to single metronode failure. The objective of the application is to determine the optimalposition of a set of metro nodes such that the total optical fibre length isminimized. We prove that this problem is NP-Complete. We present twoalternative combinatorial optimisation approaches to finding an optimal metronode placement using: a mixed integer linear programming (MIP) formulation ofthe problem; and, a hybrid approach that uses clustering as a preprocessingstep. We consider a detailed case-study based on a network for Ireland. Thehybrid approach scales well and finds solutions that are close to optimal, witha runtime that is two orders-of-magnitude better than the MIP model.

A Combinatorial Optimisation Approach to Designing Dual-Parented Long-Reach Passive Optical Networks