WDM光网络中OXC结构对带内串扰积累的影响

串扰是波分复用(WDM)光网络中光交叉连接(OXC)投入实用的最大障碍。理论分析了基于扩展Benes(DB)结构和改进扩展Benes(GMDB)结构的3种典型OXC节点结构中的带内串扰,并数值模拟了基于两种结构的OXC节点中带内串扰的积累特性。结果表明,基于DB结构和GMDB结构的OXC节点可以完全消除低于二阶的各类串扰。发现基于GMDB结构的OXC节点能大大减少带内串扰的积累,与基于DB结构的OXC节点相比,基于GMDB结构的OXC节点对光开关串扰系数的要求放宽了5dB,说明OXC节点结构的选择对消除串扰尤为重要。

Impact of OXC architecture on the accumulation of intraband crosstalk in WDM optical networks

Optical crosstalk imposes a major limit on the practical implementation of optical cross-connects(OXCs).Intraband crosstalk characteristics of three typical OXC nodes based on dilated Benes(DB) network and generally modified dilated Benes(GMDB) network are studied.Results show that OXC composed by DB and GMDB network can remove the first order crosstalk successfully.At the same time,the power penalty induced by intraband crosstalk is studied through numerical simulation.Compared with DB network,GMDB network can eliminates crosstalk effectively.The crosstalk level of optical devices required in GMDB network is about 5dB lower than that in DB network to keep the power penalty below 1dB at the bit error rate of 10~(-9),which indicates that the OXC structure plays an important role in eliminating optical crosstalk.