Access-Segment Substitution in Passive Optical Networks: A Feasibility-Gated Decision Logic for RF–PON Hybrid Deployment Efficiency

Broadband access networks must expand under stringent cost and time constraints while meeting rising service expectations. Passive Optical Networks (PON) provide strong long-term capacity and scalability, yet real-world deployment bottlenecks persist particularly in the access (drop) segment where civil works, rights-of-way, and premises-level variability dominate rollout lead time and cost per connection. This paper reframes “hybrid access” not as a generic technology integration problem but as a segment-level substitution decision: retaining fiber in feeder and distribution segments while selectively substituting the access segment with Radio Frequency (RF) access when feasibility conditions are satisfied. We develop a feasibility-gated, decision-traceable framework that (i) decomposes the Optical Distribution Network (ODN) into feeder, distribution, and access segments; (ii) defines a feasibility gate for RF substitution across bandwidth sufficiency, service-level constraints, coverage feasibility, and reliability; and (iii) evaluates deployment efficiency through scenario-based comparative reasoning across urban high-density, suburban medium-density, and rural/low-density contexts. Findings indicate that access-segment substitution can yield material reductions in time-to-connect and/or cost-per-user where civil works dependency is binding, while advantages are moderated in dense urban environments where RF densification, coordination, and site constraints can shift the critical path. The framework contributes a managerial decision logic that connects feasibility screening, context conditions, and deployment efficiency outcomes into actionable guidance for operators and policymakers, while remaining explicit about boundary conditions and non-statistical generalization. (Cisco Systems, Inc., 2020; International Telecommunication Union [ITU], 2022; Broadband Commission, 2021; World Bank, 2020a).