Research And Implementation On Key Technologies Of Core Node In Optical Packet Switch Networks

With the rapid development of Internet and increasing transmission data rates, switching capacity is still one of primary bottlenecks of the network. Optical switching technology includes optical circuit switching (OCS), optical burst switching (OBS) and optical packet switching (OPS). Among them, OPS technology has advantages of finer transmission and switching granularity, much flexibility and higher bandwidth utilization, and is so regarded as one of the evolution solution of future all-optical network.The laboratory where the author works has undertaken several research projects on OPS technology. This thesis summaries what the authors have done in NSFC-funded Key Project of "Multicasting capable Testbed of Optical Packet Switch (McTOPS)". The scope of this thesis focuses on the key technologies of OPS networks, including optical packet switch controlling platform, optical label extracting circuits and optical switching fabric based on Semiconductor Optical Amplifier (SOA).Firstly, the generic architecture of OPS networks and the differences between synchronous and asynchronous OPS networks are introduced. The key technologies such as the label extracting, label processing and contention resolution are respectively introduced. The general functions and structures of edge node and core node are summarized, and we also discuss these two kinds of nodes in McTOPS.Secondly, implementation scheme of core node in the McTOPS project based on FPGA and SOA switching fabric is promoted. We focus on the optical label extracting circuit, optical packet switching controlling platform and SOA based optical packet switching fabric. Moreover, optical packet switching algorithm of core node in McTOPS is presented.Thirdly, we propose a scheme to optimize the power consumption in Optical Packet Switching (OPS) node based on Semiconductor Optical Amplifiers (SOA). This optimization algorithm is used to reduce bias current of each output SOA in switching fabric. By simulation, it demonstrates that the scheme as proposed can reduce switching fabric power consumption by about 10%, and we also get that the efficiency will be larger with unbalanced traffic load.Finally, we conclude the thesis with the outlook on the future research and implementation both in core node design and optimization of power consumption of switching array.