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多项选择题 Click the Exhibit button. When designing a DWDM system with multiple amplified spans， a pre-amp is needed at Site B to （）.

A、 offset the OADM loss at site B

B、 overcome the high multiplexer loss at site A

C、 amplify signal levels after the high loss through Fiber Span 1

D、 adjust add channels at site B to be at the same level as the passthrough channels

E、 ensure that the per channel power is higher than the minimum needed for the post-amp at Site B

  • A,C,E

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