Although PON can provide high bandwidth, e.g., 1.25Gbps EPON, the network throughput of the FiWi network is still bottlenecked by the interference in wireless communications.
In a single-radio single-channel wireless network, the maximum throughput at each gateway will be much less than the radio’s data rate due to intra-path and inter-path interferences.
Though we can deploy more gateways to achieve throughput increase by the ideal non-overlapped gateway placement, the bandwidth provided by PON subnetwork is still more than enough for the achievable throughput at the front-end wireless subnetwork of the FiWi network.