| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 88 === The rapid increasing of multimedia applications makes it indispensable for cross-connect switches to provide multicast services. The subject of this thesis is on the design and analyses of optical cross-connect (OXC) with unicast and multicast functions, which are implemented in parallel to provide both functions simultaneously. Unicast switching is achieved by using tunable lasers and a wavelength router, while for multicasting, broadband sources and the spectrum-slicing technique via the same wavelength router are utilized. To deal with the increasing load of multicasting, the OXC is designed to allow multiple sources to multicast simultaneously.
To evaluate the system performance for the proposed OXC, we first analyzed the maximal input load for both unicast and multicast switching, and investigated the relation between the maximum input load and the system throughput. Meanwhile, we derived analytic expressions and use simulation approach to calculate the performance parameters such as packet loss probability, mean waiting time, and the required buffer sizes.
The proposed OXC was applied to MPLS systems to demonstrate its feasibility. The designed unicast and multicast architectures can fit to the requirements of label switching at layer 2. No address differentiation and switching at layer 3 is needed. Especially, our switches need a single step of header process, comparing to two steps required for conventional multicast switches with copy networks. Thus, our switches can operate in a faster and more efficient way.
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