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A new fault-branch detection scheme is proposed to troubleshoot the breaks of any distribution fibers in a time-division multiplexing (TDM) passive optical network. We employ a continuous optical frequency sweeper at the optical line terminal (OLT) and an interferometric (IF) device at each optical network unit (ONU). By analyzing the spectrum of the returned combined signals at the OLT, we can obtain...
It has been reported that Internet Protocol (IP) packet traffic exhibits self-similarity or long range dependence (LRD) and causes the degradation of switch performance. Therefore, it is crucial for an appropriate buffer design of switch. In this paper, we investigate the packet loss behavior of the switch under self-similar variable packet length traffic by modeling it MMPP/M/1/K as queueing system...
In this paper, we propose a new packet scheduling algorithm for IEEE 802.16 wireless access systems running time division duplex (TDD) mode. We compare the performance of the proposed algorithm to others in terms of bandwidth and fairness in details. The simulation results show that not only the newly proposed algorithm can handle the dynamic bandwidth allocation to achieve higher throughput, but...
In this paper, we propose an efficient approximate Markovian model for optical packet switch (OPS) employing partial buffer sharing (PBS) mechanism under self-similar traffic input The computation complexity could be greatly reduced while retaining satisfactory accuracy. Accordingly, we investigate and analyze both the short term and long term performance measures. Our model is useful in performing...
In this paper, we analyze the switching performance of wavelength division multiplexing (WDM) optical packet switch (OPS) employing wavelength conversion (WC) techniques under Markovian modeled self-similar traffic input to realize the benefit of wavelength conversion. The analytical results are calculated and verified by simulation. We propose a procedure to calculate the numerical results in order...
In this paper, we investigate the switching performance of feedback (FB) type wavelength division multiplexing (WDM) optical packet switches (OPSes) with various packet scheduling algorithms that determine the buffer entrance sequence of packets arriving at the input end of the switches. Five different packet scheduling algorithms have been applied to the FB type WDM OPSes. It is observed that OPSes...
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