| Summary: | 博士 === 國立交通大學 === 光電工程所 === 90 === This dissertation mainly includes four network architectures: the star-ring architecture (SRA), the modified star-ring architecture (MSRA), the star-bus-ring architecture (SBRA) and the bidirectional path-protected ring architecture (BPRA). These architectures are hybrids of the traditional topologies such as star, bus and ring with a few protected and restored functions. First, we proposed a cascade add/drop transceiver (CAT) structure in the passive optical star-ring networks to effectively and systematically solve the OBI problem. This work, being a system approach to deal with the problem, eliminates optical beat interference (OBI) completely in the lower level ring networks by using the CAT in each optical network unit (ONU).
Next we demonstrated a modified star-ring architecture (MSRA) which employs a properly optimized two-level network architecture with self-healing capabilities on the lower level. The self-healing function can be performed at remote nodes (RN) by using optical switches to reconfigure the ring subnets if any link fails. This architecture is a feasible choice in terms of the network capacity, the OBI-reducing capability, the quality of service (QoS), and the cost of initial installation. Moreover, we proposed a novelDWDM and subcarrier multiplexing network, which employs a properly designed three-level star-bus-ring architecture (SBRA). The star subnet establishes a high-capacity infrastructure for the network, whereas the bus subnets offer broadband channels for multi-wavelength signals to and from the lower-level ring subnets. In the ring subnets, we also adopted the CAT structure at each ONU to overcome OBI problem, and a simple surviving scheme based on two protected stages in the SBRA.
Finally, A two-level BPRA for a broadband fiber-wireless access network is proposed. This architecture can perform self-healing function under link failure and provide high reliability and excellent flexibility. The 16-QAM modulated signals are used in this network to achieve better spectral efficiency on both up/downstream subcarrier channels. This architecture can provide high reliability and large bandwidth for the wireless end-users.
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