WhattwodescriptionsbestdefineDWDM？（）

A.aWDMsystemthatiscompatiblewithEDFAtechnology
B.anopticaltechnologyfortransmittingupto16channelsovermultiplefiberstrands
C.anopticaltechnologyfortransmittingupto32channelsovermultiplefiberstrands
D.atechnologyfortransmittingmultipleopticalsignalsusinglesssophisticatedtransceiverdesignthenCWDM
E.atechnologyfortransmittingmorecloselypackedopticalsignalsusingmoresophisticatedtransceiverdesignsthanCWDM

【参考答案】

A, E