The maximum optical power of light-emitting OBU output is 20dBm, which is used in the C-band 80 system. How much dBm should the single-wave standard output optical power be?

The maximum optical power of light-emitting OBU output is 20dBm, which is used in the C-band 80 system. How much dBm should the single-wave standard output optical power be?
A . +4dBm
B . +7dBm
C . -2dBm
D . +1dBm

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Answer: D