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Problem statement: The purpose of this paper was to investigate all optical packet&#13; switching, because it was the key to the success of the future Internet. It can meet the stringent&#13; bandwidth requirement of future Internet applications, such as real-time video streaming. Due to the&#13; lack of optical Random Access Memory (RAM), however, the all-optical schemes studied in the&#13; literature were either not flexible enough to accommodate Internet packets, which were variable-length&#13; in nature, or fail to schedule packets at switches to achieve low loss rate. Approach: The aim of this&#13; paper was thus to tackle the flexibility and utilization issues in all-optical packet switches, even at the&#13; absence of optical RAM. We approached this paper by first studied a new slotted model for all-optical&#13; variable-length packet switching, which was called Variable-length-Packet Fixed-Length Slot (VPFS)&#13; switching. Results: We proved by mathematical analysis the theoretical maximum utilizations that can&#13; be achieved by the model in two variant schemes. Then we proposed a new scheduling algorithm for&#13; shared-fiber-delay-line switches in order to achieve low loss rate when the utilization approaches the&#13; maximum. We justified our design by simulation. In our finding, through mathematical analysis and&#13; computer simulation, our proposed switching model and scheduling algorithm can be coupled well to&#13; achieve good performance for all-optical packet switches. We also found that the selection of the slot&#13; size in the network was very critical as it determined the transmission overhead and hence the&#13; utilization of the all-optical network. Our research limitation depended on slot size. Although a small&#13; slot size was critical for high utilization with our model, it was not always preferable. It was because a&#13; small slot size increased the switching and scheduling complexity at the switch. Thus the selection of&#13; an optimum slot size for the network was a compromise between utilization and complexity.&#13; Conclusion/Recommendations: A fast scheduling algorithm has been studied in order to reduce the&#13; scheduling complexity so as to increase the utilization without much penalty. In regard to the practical&#13; implications, the VPFS was a promising model to fully utilize the huge capacity of all-optical networks&#13; and to accommodate variable-length packets for future Internet traffic. With VPFS, the selection of the&#13; slot size was critical, and it was a compromise between the network utilization and scheduling&#13; complexity

Advanced Information Technology of Slot-Switching Network Schemes for on All-Optical Variable-Length Packet