Bus FTTH networks

The considerable concern about the high constructing and maintaining costs is the bottleneck of rapid and world-wide fiber-to-the-home (FTTH) deployment. However, it is also important to maintain high communicative performance of FTTH networks as suppressing the constructing and maintaining costs. In order to reduce the constructing and maintaining costs of FTTH networks, this paper proposed a bus structure with the technique of time-division multiple access (TDMA) to constitute FTTH networks. The bandwidth utilization of the bus FTTH network is much higher than that of star/tree FTTH networks. Therefore, the number of optical fibers used to construct the bus FTTH network is much smaller than that used to construct star/tree FTTH networks. The distance between the central office and the farthest optical network unit (ONU) of the proposed network will be longer than that of ring FTTH networks. This can reduce the number of central offices. Because the number of fibers and the number of central offices are simultaneously reduced, the constructing and maintaining costs of bus FTTH networks can be greatly suppressed. Based on the analysis of the waiting time on optical TDMA networks, traffic-control approaches are exploited to logically distribute medium access among ONUs. To put traffic-control approaches to use on FTTH networks can result in the ideal fair behavior of networks. Hence, the FTTH networks can satisfy the commercial contracts agreed by customers and network managers. Otherwise, to implement traffic control on the proposed FTTH network can keep high performance from degradation even if the network is with full load.