Abstract

The rapid development of emerging network services are shifting the major communication scheme in metro-aggregation networks from unicast to in-cast and multicast, which has promoted the development of the point-to-multipoint coherent optical transceivers (P2MP-TRXs). Meanwhile, for its cost-effectiveness and energy-efficiency, filterless optical network (FON) has been considered as a promising optical infrastructure for metro-aggregation networks, and it is naturally compatible with P2MP-TRXs because they both rely on the broadcast-and-select scheme for communications. In this paper, we study the problem of survivable multilayer planning of FONs with P2MP-TRXs and design algorithms to ensure that the planned FON can protect itself against single-link failures. We first formulate a mixed integer linear programming (MILP) model to jointly optimize the routing of working and backup lightpaths of traffic demands, and the allocation of P2MP-TRXs, assignment of subcarriers (SCs) to P2MP-TRXs, spectrum assignment on fiber trees for setting up the lightpaths, such that the capital expenditures (CAPEX) of the planned FON is minimized. Then, to solve the problem more time-efficiently, we propose a polynomial-time heuristic based on auxiliary graphs (AGs) and lightpath grouping. Extensive simulations verify the performance of our proposals and indicate that they can outperform existing benchmarks.