This paper presents a study of crosstalk evaluation of a non-blocking banyan switch fabric based on acousto-optic tunable filters (AOTFs). The non-blocking banyan switch fabric is based on the basic unit of 1x2 AOTFs. After describing the crosstalk that exists in the non-blocking banyan switch fabric based on 1x2 AOTFs, we place our emphasis on the two kinds of crosstalk of them: the accumulated AOTF's coherent crosstalk, and the first-order crosstalk caused by the lack of multiplexers. Analyzing the BER degradation induced by these two kinds of crosstalk, we give the theoretical expression of BER and power penalty.
This paper presents an approximate analysis of delay performance of a WD/SD optical packet/burst switch equipped with infinite optical buffers. By using M/G/1 model, we give the theoretical expression of delay performance of the switch fabric with/without assignment of priority class to service under fixed/variable packet length. Meanwhile, the results of numerical analysis are presented, too. According to these analyses, we give the following main conclusions: in the switch fabric with variable packet/burst length and no assignment of priority class to service, the mean packet/burst delay appears much smaller than that with fixed packet length; and in the switch fabric with assignment of three priority classes to service, the delay of two kinds of services with lower priority classes appears to bigger than that of service with no assignment of priority class.
This paper presents a comparison study of average queuing delay performance between slotted and unslotted all-optical packet-switched metropolitan area network (MAN) configured as star physical topology. After studying the average queuing delay performance of the two networks which are both equipped with infinite optical buffers, we research the relationship between average queuing delay and the number of optical buffers in the networks equipped with finite fiber delay lines. Considering the complexity of exact solution, we give an approximate solution. By using mathematical expressions and figures, we give the following main results: (a) for a network equipped with finite optical buffers, there exists a maximum average queuing delay; (b) when the numbers of fiber delay lines that are respectively equipped to slotted and unslotted network is same, the maximum average queuing delay of unslotted network is bigger than that of slotted network; (c) there exist the best N1 and N2 (the number of optical fiber delay lines), which can bring on the best average queuing delay performance of slotted network that is equipped with finite optical buffers.
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