Receiver technology uses a local oscillator laser of the same frequency as the received signal to perform coherent processing and recover () information from the received signal. (Multiple choice)

Which of the following is not a passive optical device? (Multiple choice)

Which of the following descriptions about the system architecture of 0ptiXtrans E6600/OptiX OSN 1800 is correct?

In the WDM transmission system, the main factors affecting the unevenness of the power balance of each channel do not include? (Multiple choice)

For Huawei equipment, the NODE ID is the unique identifier of the intelligent network element on the control plane. After the network is configured with intelligent services, the NODE ID will not be modified during construction.