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最大缓存时间限制、时延粒度限制、光分组长度限制3大限制因素,对传统光缓存器的前馈型和反馈型两种结构进行了分析。分析表明,影响光缓存器性能的3大限制因素在两种结构中的相互制约关系限制了光缓存器性能的进一步提高。在此基础上提出的一种自适应弹性环光缓存器(E-FLOB)结合了两种传统结构的优势,并分离了3大限制因素间的相互制约关系。结构分析显示,E-FLOB在缓存级数为16时可减少反馈型光缓存器噪声积累约3个数量级。网络性能仿真表明,弹性环结构比前馈型结构使用更少的缓存级数,获得比两种传统结构更低的分组丢失率。
Maximum buffer time limit, delay granularity limit, and optical packet length limit, the paper analyzes two structures of feedforward and feedback of traditional optical buffer. The analysis shows that the three constraints that affect the performance of the optical buffer restrict the mutual improvement of the optical buffer performance in the two structures. Based on this, E-FLOB, an adaptive elastic ring buffer, combines the advantages of the two traditional structures and separates the three constraints. Structural analysis shows that E-FLOB can reduce the accumulation of feedback type optical buffer noise by about three orders of magnitude when the number of buffer stages is 16. The network performance simulation shows that the elastic ring structure uses fewer buffer stages than the feedforward structure and achieves lower packet loss rate than the two traditional structures.