Question: Which optical networking technology multiplexes two signals: one in the 1 5 5 0 n m band and the other in the 1 3 1

Which optical networking technology multiplexes two signals: one in the 1550nm band and the other in the 1310nm band?
WDM
DWDM
CWDM
SONET
Which optical networking technology multiplexes two signals: one in the 1550nm

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