| Optical transmission technology which can provide high capacity, long distance communication, has been used widely. The technology is still active and is undergoing new innovations. It covers the range from wide area network, metro area network to local area network; Transmission capacity increases greatly according to the growth of data rate of each wavelength and the number of wavelengths multiplexed; Transmission span with no electric regeneration extends farther and farther, and the new world records can never has a long life; The intelligence of transmission system has been improved a lot, and the automatic switching in optical layer becomes true.Optical fiber communication needs not only the basic physical links made up by optical fiber, but also the nodes to deal with the optical and electric signals. Optical backbone and metro networks typically have mesh topologies, in which the key nodes are Optical Cross-Connect (OXC) and Optical Add/Drop Multiplexer (OADM). While optical access networks use EoS (Ethernet over SDH) technology to support packedge service on exiting SDH networks. These nodes will be analyzed in details in this dissertation.At present, ASON do not make any progress to transport plane. When the optical wavelengths adding/dropping and routing are realized in control plane, transport plane is lack of intelligent monitoring and adjusting to optical level signal. Because of dispersion, power unequalization and somthing else, the transmission quality of ASON can not be guaranteed. So the Adaptive Optical Networks is raised. Compared to ASON, Adaptive Optical Networks has better self-adaptive and self-organization ability. It can realize adaptive service access and adaptive transmission parameters adjusting accorsding the service requirements and the reality of optical network. This dissertation analyzes the layer model, service model, and the network architecture of Adaptive Optical Network (AON) and design a node program that make the WDM network evolve to AON.The research work included in this dissertation is supported by "Research on and Implementation of Reconfigurable OADM in WDM system" and "DWDM OSC Self-adaptive System" . The main contents and innovations are as follows:1．Design and implement the Add/Drop Unit in ROADM equipment. Adopt the "Broadcast and Selection" dynamic add/drop scheme to cope with the critical conditions of war field. This architecture can realize the dynamic reconfigurability and scalability of the system. The 8 optical transform units have the same size and can be mix-plugged. The types and structures of OADM are analyzed and compared. The details of the design and realization of Add/Drop Unit are introduced, and the add/drop function is verified.2．Analyze the performance and characteristics of every main module and the whole ROADM node through theory simulation and experiment. Also the design methods of node is raised, this theory can be applied in the design of dynamic WDM optical networks.3．Analyze and compare different ways to implement Ethernet access in SDH system. Design EoS access node system based on LAPS technology. This system can provide packet service on exiting SDH networks. The E1 interface of this system meets the requitment of ITU-T G.703．4．Research the layer model, service model, and the network architecture of Apaptive Optical Network (AON), analyze the development of AON. Present a new approach to make WDM evolve to AON based on OSC self-adaptive technology, Tunable integrated optical demultiplexing receiver technology and Wavelength Selective Switch (WSS) technology.
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