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DL7统的基于电调制的商用TDM系统速率已可达10Gb八，一些公司将在明年推出40Gb／S的产品。但是，为了进一步提高单信道的速率，必须在光域内再进行一次复用，即光时分复用（OTDM）。与波分复用（WDM）不同，WDM是将多个速率较低的信道分别复用到不同的波长上在同一根光纤上传输
DL7 system based on the electrical modulation of the commercial TDM system rate of up to 10Gb Eight, some companies will launch 40Gb / S next year. However, in order to further increase the single-channel rate, it is necessary to perform one multiplexing in the optical domain once again, that is, optical time division multiplexing (OTDM). And WDM (WDM) is different, WDM is a number of lower-speed channels were multiplexed to different wavelengths on the same fiber transmission