In the C-band 80-wave system, add the operation of C-band odd-numbered waves. Which of the following description is correct? (Multiple choice)

In the C-band 80-wave system, add the operation of C-band odd-numbered waves. Which of the following description is correct? (Multiple choice)
A . It is necessary to re-adjust the optical emission power
B. After the operation, the signal-to-noise ratio of the original service remains unchanged
C. The operation process will interrupt the original business
D. There is no change in optical power on the OTU WDM side

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Answer: BD