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近年来,随着丰富的图像和语音业务的增加,光通信网络已经迅速向高速WDM系统升级,部分运营商已经在骨干网中部署了40Gbit/s
In recent years, with the increase of rich image and voice services, optical communication networks have been rapidly upgraded to high-speed WDM systems. Some operators have already deployed 40 Gbit / s in the backbone networks