Multiple input single output optical buffers for asynchronous optical packet switched networks

Shuna Yang, N. Stol
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引用次数: 1

Abstract

Optical buffering is one major challenge in realizing all-optical packet switching. In this paper we focus on a delay-line buffer architecture, called a Multiple-Input Single-Output FIFO (MISO-FIFO) optical buffer. This architecture reduces the physical size of a buffer by up to an order of magnitude or more by allowing reuse of its basic optical delay line elements. We consider the MISO-FIFO optical buffers in a network scenario where the incoming packets are asynchronous and of variable length. A simple Markov model is developed to analyze the performance of our buffering scheme, in terms of packet loss ratio, average packet delay and the output link utilization. Both simulation and analytical results show that increasing the buffer size will significantly improve the performance of this optical buffer under low system load. However, under high system load, its performance will deteriorate when increasing the buffer size. In addition, this paper gives clear guidelines for designing the optimal basic delay line lengths under different system loads, in order to get the minimal packet loss. It is noticeable that this optimal basic length value is independent of the buffer sizes.
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异步光分组交换网络的多输入单输出光缓冲器
光缓冲是实现全光分组交换的主要挑战之一。在本文中,我们重点研究了一种延迟线缓冲器结构,称为多输入单输出FIFO (MISO-FIFO)光缓冲器。这种架构通过允许重用其基本的光延迟线元件,将缓冲区的物理大小减少了多达一个数量级或更多。我们考虑在传入数据包是异步和可变长度的网络场景中的MISO-FIFO光缓冲器。建立了一个简单的马尔可夫模型,从丢包率、平均包延迟和输出链路利用率等方面分析了该缓冲方案的性能。仿真和分析结果表明,在低系统负载下,增大缓冲器的尺寸可以显著提高该光缓冲器的性能。但是,在高系统负载下,增大缓冲区的大小会使其性能下降。此外,本文给出了在不同系统负载下设计最优基本延迟线长度的指导原则,以获得最小的丢包量。值得注意的是,这个最佳基本长度值与缓冲区大小无关。
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