The wave division system complement to chromatic dispersion mainly adopts the DCM compensation method. The following statements about DCM dispersion compensation, which is wrong?

• A.10G system with line fiber length less than 400km, G.652 DCI can be used to compensate G.655LEAF).
• B.The DCM module is more likely to cause nonlinearity than the line transmission fiber, so it is necessary to strictly control its fiber-optic power.
• C.Improper configuration of the DCM will result in degradation of the receiving end performance.
• D.Improper configuration of the DCM will result in degradation of the system signal-to-noise ratio.

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What are the basic principles of MSTP device fault location? (Multiple choice)

• A.External first, then transfer
• B.Network first, then network element
• C.Advanced first, then low level
• D.Low speed first, then high speed

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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.-2dBm
• B.+1dBm
• C.+4dBm
• D.+7dBm

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The single-fiber bidirectional WDM system uses only one fiber to transmit optical signals in both directions simultaneously. The optical signals in both directions should be arranged at different wavelengths.

• A.FALSE
• B.TRUE

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