研究了光分组交换中光输出缓存器引起的排队延迟对节点串扰特性的影响,建立了节点串扰特性与缓存器长度之间关系的数学模型.结果表明,对光分组交换节点,由于缓存器的存在,串扰源数目随缓存器的长度增加而增加;串扰中,非相干串扰占多数,数目随机的相干串扰的影响较小;且当缓存器较长时,相干串扰的影响可以忽略,即可将所有串扰视为非相干.

The effects of queuing delay of output buffer on the property of crosstalk in optical packet switching nodes are investigated. The analytical relationship between crosstalk and buffer length is derived. It is concluded that the crosstalk increases with the increase of buffer length. Among the crosstalk sources, the most of them are incoherent, and the probability of coherent crosstalk decreases with the increase of buffer length significantly, and if the buffer length is longer enough, the coherent crosstalk could be neglectable.