对光分组交换中每条链路共享波长转换器(SPL,share-per-link)的结构进行了理论分析,推导出SPL系统的丢包率公式,并对系统丢包率与负载、输入光纤端口数和每纤波长数的关系进行了数值计算。结果表明:SPL的丢包率极限是随着波长数的增加而减小,在SPL结构中当波长转换器数目较小且一定时,波长数大的系统的丢包率比波长数小的系统要大。 The theoretical analysis of SPL (shared-per-link) structure in optical packet switching is deduced, and the formula of packet loss rate in SPL system is deduced. The relationship between system packet loss rate and load, The relationship between the number of ports and the number of each fiber was numerically calculated. The results show that the SPL packet loss rate limit decreases with the increase of the number of wavelengths. When the number of wavelength converters in a SPL architecture is small and constant, the system with a large number of wavelengths has a lower packet loss rate than the number of wavelengths To be big.