A Study Of Architecture And Performance Of Variable Time-Period Optical Switch With Burst Mode

During the research of the next optical network, we believe that the requirement formulti-wavelength optical networks is not only tremendous bandwidth capacity, but also theflexibility of multi-services supporting, robust of network architecture, as well as efficientusability for bandwidth. Meanwhile, instead of optical packet switching facing significantcost and technological hurdles, Optical burst switching (OBS) brings us a new hope due toit's balance between circuit switching and packet switching in optical domain. So, it is greatmeaningful on the research of the architecture and performance of a OBS scheme in thedissertation. In the dissertation, it is analyzed for the developing level of optical networkstechnologies and all-optical switch at present. Also some necessary key technologies ofOBS are introduced simultaneously. The Variable Time-period Optical Switch with Burstmode is proposed in the dissertation. The scheme mostly includes structures andfunctions of Edge-Optical switch and Core-Optical switch (C-OS), Burst Control Packet(BCP) protocols and the Frame structures, as well as the physical parameters. VTPOS supports both switching modes, which are the channel claiming interruptionmode and the channel automatic delay-releasing mode. Under the channel claiminginterruption mode, the longer burst time can be available. Furthermore,high speed circuitservices can be transmitted directly, thus, can improve the efficiency of using bandwidth.Actually, under the channel automatic delay-releasing mode, it supports a single andfixed length burst switching. After a standard burst passed a switch node, the nodereclaims the reserved bandwidth resource automatically. BCP electronical switch fabrics, Burst switch fabrics, Queue models and Schedulealgorithms in VTPOS switch node are discussed further, and the blocking performance ofoptical switch fabrics are also analyzed and simulated as following. In order to appreciatethe blocking performances in different switch fabrics, K rank non-blocking switch matrix I I Iand the matrix status distance conceptions are put forward; those methods are applied toanalyze multi-stage and feedback switch fabrics. A schedule algorithm of Multi-portsshared with FDL buffers is presented in the dissertation; it brings a high efficient andthroughout for a shared output buffer. The dissertation describes several traffic models for VTPOS, as well as analyzes andsimulates the Characters of multiplexing, immerging, shaping of traffic, especiallyfocuses on the Self-similarity traffic's influence to the buffer overflow and queue delay atE-OS. In order to improve the switch performance, a multi-link and multi-direction sharedswitch scheme with a little buffer and bufferless is proposed, satisfy results are obtainedunder simulations of switch in different switch fabrics. According to the feature of the network, the dissertation researches the configurationof wavelength converters in a switch node and the distribution in network, the trafficlogic route's optimizing.