| Next generation access network will require flexible deployment, large backbone capacity, upgrade ability, scalable to user number and demand, and economically feasible. One example is to provide ubiquitous, blanketed broadband access service in metropolitan area. Such requirements are instrinsically impossible to meet if the network is designed with any single access technology. On the other hand, a hybrid optical and wireless access network would combine high optical capacity and flexible wireless deployment that is economic and scalable.;This dissertation focuses on hybrid optical and wireless access networks that consists of wireless mesh network based on multi-hop wireless communications and novel optical backhaul networks. Two novel optical backhaul networks are proposed, analyzed, and experimentally evaluated. The first optical backhaul network is a reconfigurable architecture based on the Time Division Multiplexing Passive Optical Networks. The reconfigurable architecture can optimize the network efficiency and performance by dynamic bandwidth allocation. An experimental testbed is built to demonstrate the feasibility for realisitc application. The second optical backhaul network is based on a grid structure to provide broadband, scalable, blanket-cover, and cost-effective connectivity. Advanced optical devices are employed to achieve centralized control, bandwidth scalability, resource sharing, statistical multiplexing gain, and ease of deployement and management. Experimental testbed is built for performance evaluation and demonstration of QoS capability. An integrated routing paradigm is developed to enahnce the wireless mesh network performance by leveraging the optical backhaul. Finally, a novel feedback-based burst-mode clock and data recovery architecture is proposed for both optical backhaul networks. It can rapidly recover clock for data sampling and provide jitter tolerance that feed-forward CDR circuits cannot achieve. |
